. Jawohl! A filter synthesis application can help design various types of filters. ), Nonlinear components (diodes, transistors, etc. © All Rights Reserved. Developed by Dr. Alex Arsenovic from University of Virginia, scikit-rf (aka skrf) is an Open Source, BSD-licensed package for RF/Microwave engineering implemented in the Python programming language. The command line conversion program tool is used by the GUI to import and export datasets, netlists and schematics from and to other CAD/EDA software. I am now happy to say that this is free for download for 7 in. http://dd6um.darc.de/QucsStudio/qucsstudio.html. You might be able to find a copy of a second article on Puff here: https://authors.library.caltech.edu/79089/1/01150017.pdf. A component library manager gives access to models for real life devices (e.g. The purpose of the Qucs-S subproject is to use free SPICE circuit simulation kernels with the Qucs GUI. The AC analysis is set up as before, but in addition the value of the capacitor C1 is increased in 5 steps from 10nF to 100nF. electromagnetic field simulator), many historical flaws were fixed. In the formula . Wincal from Cascade can be freely downloaded. Thanks to Juerg... VNA Tools is a free software developed by the National Metrology Institute from Switzerland (METAS) for measurements with the Vector Network Analyzer (VNA). That's not a request, ist eine bestellung. . AppCad originated at HP many years ago and is now offered by BROADCOM: AppCad is very useful to get very quickly engineering answers for transmission lines. Here's two snapshots of a free shirt that Z0lver provided to Microwaves101. If so, feel free to help point users towards using the app and providing feedback. Unfortunately, Puff wasn't maintained that well but can still be compiled on some Linux machines. Parameters in brackets "[]" are optional. The purpose of the Qucs-S subproject is to use free SPICE circuit simulation kernels with the Qucs GUI. If anyone can rate these tools for us, we have a free tool for you! For detailed description please refer to the "Measurement Expressions Reference Manual". . The LayoutEditor or more exact the SchematicEditor can open this file format, but it requires information on the used symbols In QucsStudio 2.5.7 the TH parameter for Pulse high duration is not respected, however TL is ok. Qucs intentionally uses its own SPICE incompatible simulation kernel Qucsator. It reads a netlist file augmented with commands, performs simulations, and finally produces a dataset file. . . implementation bug in QUCS/QucsStudio. DC, AC, S-parameter) and save the generated information to SCH, DPL, VHD, V, VA, M, or OCT technical.pdf. VNA Tools does support coaxial, waveguide and on-wafer S-parameter measurements. For data review ParaView is a fantastic program it accepts all sorts of data files and  automatically will plot, animate etc. Puff  was a program developed at CalTech, back in the days when IBM was marketing the original PCs (mid 1980s). Even a virtual VNA is built in to create artificial measurements – this is very convenient for educational purposes as no VNA hardware is needed to demonstrate the S-parameter metrology and the impact from the different possible calibration methods. No restriction for using as a S-parameter file viewer. . Quick Reference¶. of the tools’ document . Thanks, guys! Matlab or Octave are used as an easy and flexible scripting interface. Note: all of the links on this page were working, on 4 July 2018. 1. It is a stand-alone executable file so you don't need a MatLab license. QucsStudio version 3.3.2 is now available. For example a single m as unit has not the meaning of milli anymore, i.e. . 2021 Microwaves101. This input came from Jeff in June 2015: I'm one of the founders of Raven Standard LLC. . Quite Universal Circuit Simulator (Qucs) is a free-software electronics circuit simulator software application released under GPL. There are the GUI itself, The GUI is used to create schematics, setup simulations, display simulation results, writing VHDL code, etc. I can enter in the code from the tutorial, but that is where things go amoke. Qucs again. Analog and mixed simulations can be performed by simulators that read the qucsator netlist format. * Many bug fixes undertaken in the Qucs GUI code and additions made for improving transistors, diodes, bridges, opamps). Qucs-S example schematics can be found in the Qucs-S V0.0.21 source code “examples” directory. . Sonnet provides a free student version of their planar EM solver. Z0lver is a cross-platform transmission line and circuit "z0lver" (solver) that links schematic capture, analysis and visualization, and fabrication of printed RF/microwave circuits. For purely digital simulations (via VHDL) the program FreeHDL [2] or Icarus-Verilog can be used. . Start looking here: https://perso.crans.org/besson/matlab-clones.en.html. Qucs vs spice. We are eager to give back to the community and are therefore hoping that you find the app interesting and worthy of the site. This offering is somewhere between an EM solver and a linear simulator... it's free MatLab code that will help you calculate radiation loss, thanks to Sven van Berkel! A Qucs Tutorial for RF Transmission Lines Pere Pal a-Sch onw alder February 2012 1 Simple Transmission Line in the Time Domain Let’s start with a simple circuit composed of a voltage generator, a transmission line and a load. QUCS Alternatives. Qucs consists of several standalone programs interacting with each other through a GUI. . Click the images for a full size version. Be careful what you wish for, modern and free mean tons of ads and possibly spyware... Vipec is free open-source program for analysis of high frequency, linear electrical networks. At the top menu, under “Tools”, click “Filter synthesis”. . It merges the power of SPICE and the simplicity of the Qucs GUI. The filter synthesis window will open. They are mostly free software, and most run on multiple operating systems. 3. The attenuator synthesis application can be used to design various types of passive attenuators. Qucs-S is spin-off of Qucs. - Qucs - Working with Subcircuits Subcircuits are used to bring more clarity into a schematic. Start here, then try some of the free downloads. and 10 in. These are usually implemented as macros. schematic editor. - Qucs - Quite Universal Circuit Simulator Short Description of Mathematical Functions The following operations and functions can be applied in Qucs equations. Click here to go to our main page on computer-aided designNote: all of the links on this page were working, on 4 July 2018. If you ever need to convert between DWG, DXF, GDS files, download it. [qucs = quite universal circuit simulator; spice = simulation program with integrated circuit emphasis] Download Qucs - A circuit simulator that helps users perform many simulation tests (e.g. for maybe $40 (depends on exchange rates). Autodesk currently offers two free environments, TinkerCad and Sketchbook: https://www.autodesk.com/education/free-software/sketchbook, https://www.pads.com/downloads/pads-pcb-viewer/, http://www.kicad-pcb.org/display/KICAD/KiCad+EDA+Software+Suite. QucsStudio-Tutorial Part 2: Harmonic Balance Simulations Version 1.0 Author: Gunthard Kraus, DG8GB, Guest Professor at the Duale Hochschule Baden-Wuerttemberg (Friedrichshafen / Germany), assisted by the Programs Author Michael Margraf, DD6UM Email: mail@gunthard-kraus.de Homepage: www.gunthard-kraus.de January 1st, 2016 1 Some have been tested, these include, List of free electronics circuit simulators, https://github.com/Qucs/qucs/releases/tag/qucs-0.0.20-rc2, https://en.wikipedia.org/w/index.php?title=Quite_Universal_Circuit_Simulator&oldid=997880534, Free electronic design automation software, Electronic design automation software for Linux, Official website different in Wikidata and Wikipedia, Creative Commons Attribution-ShareAlike License, Lumped components (R, L, C, amplifier, phase shifter, etc. Look for it here: http://www.sonnetsoftware.com/products/lite/download.html. http://www.paraview.org/Wiki/images/f/f4/ParaViewTutorial42.pdf. The documentation offers many useful tutorials (WorkBook), reports (ReportBook) and a technical description of the simulator. interactive formula sheet. All the libraries needed are included in the executable. Release 0.0.11 introduced component values defined by equations and for the first time allowed subcircuits with parameters. It today's date is later than that, all bets are off. Screenshots Click on the pictures to see them in original size. Future versions will not be able to load old schematic files. Qucs intentionally uses its own SPICE incompatible simulation kernel Qucsator. The only downside to me is that QucsStudio runs only on Windows and not Linux and has problems with saving projects when used under WINE with Linux. QUCS has a graphical interface for schematic capture. Ansoft used to provide a free "student version" of their "Designer" software product. For our example, we are doing an LC filter, Pi type (where the first branch is a shunt), Bessel type, Low pass, Third (order – scroll down to the Example for mathematical info), and a corner frequencyof 1 GHz. Creator: sydney Created: 2018-07-31 Updated: 2019-08-26 sydney - 2018-07-31 I've been using Qucs for a while, and have just figured out that I've been doing a tutorial on EM simulation that is using QucsStudio. . For circuit optimization (minimization of a cost function), ASCO [3] may be invoked. It today's date is later than that, all bets are off.On this page we provide links to free EDA software. M.E. The library can be extended by the user. http://terahertz.tudelft.nl/Research/project.php?id=74&ti=27. These notes are written for the QucsStudio simulator, but others are available, e.g other Qucs deriva-tives, LTSpice, and many other Spice derivatives. Check out our modest Spice analysis page on Microwaves101 and consider contributing to it! For MATLAB-like software there is Octave, FreeMat, and scilab. Linear Technologies' (now part of Analog) LTspice IV is free and kicks ass. . now 3m = 3 and 3mm = 3e-3. The table below is a quick summary of the 184 components currently available in Qucs. Click here to go to our main page on computer-aided design. Then they were aquired by Ansys. Just to come up with your best measurement capability calculations (needed for the scope of accreditation) allows you to save weeks of work compared to use the existing techniques. Qucs and QucsStudio (see above) also perform Spice analysis. This is very useful in large circuits or in circuits, in which a component block appears several times. QucsStudio is not Qucs. See https://ra3xdh.github.io/ for details. DC bias shown within the schematic. Use their search tools to look for Puff. In Qucs, each schematic containing a subcircuit port is a subcircuit. If one needs EM 3D software, they should check out openEMS at openems.de. Thanks! QUCS supports transistor models, some need to be added by hand. should be replaced by V. sc. . The other reason is to compare the impact on accuracy by applying different calibration methods or calibration standard definitions on exactly the same S-parameter raw data. QucsStudio. SPICE to QucsStudio via Qucs: An international project to develop a freely available GNU Public Licence circuit simulator with compact device modelling tools, data processing capabilities, manufacturing features and an analogue/RF design environment for engineers. It is based on a quasi-analytical approach and was written at TU Delft. The supported file formats as well as usage information can be found on the manpage of qucsconv. The netlist for this simulation is as follows. On this page we provide links to free EDA software. Other new implemented features are time domain conversion, material characterization calculations (complex permittivity and permeability) and mixed mode S-parameter conversions – all with linear uncertainty propagation. Qucs version 0.0.16 while introducing a new dynamic code loader. diagrams. . - ra3xdh/qucs_s Around 2010, it was offered in version 2.1 for Windows 7. https://stecker-shop.net/ (you might want to translate from German...P. At this point, maybe the world should give up on Puff, and work on developing some modern, free apps. http://qucs.sourceforge.net/ (thanks to Matt!). The app was based on the old 'Puff' app that many of us used back in the 80s and 90s. The ‘Quite universal circuit simulator’ (Qucs) is an open source circuit simulator supporting Verilog-A compact model standardization. It gives you the ability to set up a circuit with a graphical user interface and simulate the large-signal, small-signal and noise behaviour of the circuit. The analog simulator, gnucsator, is a command line program which is run by the GUI in order to simulate the schematic which you previously setup. According to the website, openEMS is a free and open electromagnetic field solver using the FDTD method. This will be our rst circuit, which will be built step by step: . If anyone can rate these tools for us, we have a free tool for you! Tool suite Qucs consists of several standalone programs interacting with each other through the GUI. The Qucs Development Team is not a fixed group but is a dynamic organisation where different people contribute, simultaneously or at different times, to the same part or different parts of the software. It offers the ability to set up a circuit with a graphical user interface and simulate the large-signal, small-signal and noise behaviour of the circuit. Model symbols, and properties for Qucs, as well as compiled modules for qucssator are loaded dynamically during runtime. We are a group of emag enthusiasts that have spent the last bit (1.5 years) of time developing a free, open-source emag app. When baby-boomer microwave engineers retire we can rest easy knowing that smart, motivated, stick-shift-driving engineers like Alex will take up the slack. One of the reasons is to have access to a complete uncertainty budget and therefore being able to identify the main error sources (where to put the resources to increase the accuracy). Pure digital simulations are also supported using VHDL and/or Verilog. It does not appear that it has since been updated, and we can no longer find a free copy of it for you to download. Additionally, the GUI can steer other EDA tools. Brinson Centre for Communications Technology London Metropolitan University Around 2000, someone converted Puff from DOS to Windows. ), File containers (S-parameter datasets, SPICE netlists), This page was last edited on 2 January 2021, at 18:09. I've tried it and it appears to work for linear, transient, harmonic balance, and also supports Verilog device modelling. The NIST site offers a variety of free software, including various on-wafer calibration software (MultCal, for TRL and LRM), transmission line calculators, uncertainty calculators etc. Qucs is a similar package but has only support for linear and transient analysis and less support for Verilog. . . Create a new schematic if you need to. Please send us an email if you have any information for this page. The spice4qucs project group is one of a number of sub-groups within the overall Qucs Development Team. Check it out and tell us how it works for you. In addition it saves a lot of time for any accredited lab for the measurements and the needed quality management documentations. In this case, the corner frequency will … Qucs allows for nested simulations; as an example we consider an AC analysis together with a parameter sweep. Analysis types include S-parameter (including noise), AC (including noise), DC, Transient Analysis, Harmonic Balance (not yet finished), Digital simulation (VHDL and Verilog-HDL) and Parameter sweeps. Not all of it has been checked out by us, so buyer beware. Besides many new features (e.g. The bug has been . Someone let us know if this is useful or not please... We are too lazy to try this 10 year old link, can someone log in to RFglobalnet and tell us if it is still working? Indices and tables ¶ "S" letter indicates SPICE. Pure digital simulations are also supported using microstrips, coaxial cables). Let’s create a simple 3-pole, low pass, Bessel type LC filter. . It does FDTD full 3D simulations and I use it for both optics and RF simulations. Moreover, QucsStudio appears to be upgraded at more regular intervals than Qucs. . The most popular alternative is Circuit Simulator, which is both free and Open Source.If that doesn't suit you, our users have ranked 36 alternatives to QUCS so hopefully you can find a suitable replacement. While the two share some developers and they are very similar user interfaces - similar to Agilent ADS, QucsStudio has harmonic balance whereas Qucs does not and QucsStudio has a greater integration with Verilog compilation and support than Qucs. This from Simon (thanks!) There is no need to recompile Qucs and Qucsator to add new Verilog-A models. Figure 3: Qucs S parameter simulation test circuit and plotted output data for a MF axial resistor: Rs=51, Ls=8nH, Cp=1pF, Llead=1nH and Cshunt=0.1pF. The software facilitates the tasks of evaluating measurement uncertainty in compliance with the ISO-GUM and vindicating metrological traceability. Application: Qucs Category: Education Description: Quite Universal Circuit Simulator (Qucs) is an open source electronics circuit simulator software released under GPL. Release 0.0.12 extends these features to add model development using symbolic equations that are https://www.cmicro.com/support/wincal-support/downloads. KLayout is open source. Thus, we built Z0lver to add on to the features of Puff, while leveraging the benefits of new mobile technology. Please send us an email if you have any information for this page. Qucs_S V0.0.21 build can be downloaded from https://ra3xdh.github.io/ . The following categories of components are provided: There is also a Component library that includes various standard components available in the market (bridges, diodes, varistors, LEDs, JFETs, MOSFETS, and so on). 2. SPICE to QucsStudio via Qucs: An international project to develop a freely available GNU Public Licence circuit simulator with compact device modelling tools, data processing capabilities, manufacturing features and an analogue/RF design environment for engineers. Qucs_S V0.0.21 build can be downloaded from https://ra3xdh.github.io/ . Other features include the transmission line calculator, Filter synthesis, Smith-Chart tool for power and noise matching, Attenuator design synthesis, Device model and subcircuit library manager, Optimizer for analog designs, the Verilog-A interface, Support for multiple languages (GUI and internal help system), Subcircuit (including parameters) hierarchy, Powerful data post-processing possible using equations and symbolically defined nonlinear and linear devices. . There are two sites that will sell you a Puff for Windows DVD (CD?) . It is handy to edit files related to certain components (e.g. It can also report errors. . Analysis of the RF resistor model A component level version of the proposed RF resistor model is shown in Figure 4, where Z1 = … I've found this very useful and quite well-supported for free software. It is well worth a few minutes of your time to see what they have. a free and powerful circuit simulator. Here is a historical document that describes its use: R. C. Compton; W. L. Williams; D. B. Rutledge, "Puff, an Interactive Microwave Computer Aided Design Program for Personal Computers"  1987 IEEE MTT-S International Microwave Symposium Digest, pp 707 - 708. V. cs. http://www.nist.gov/ctl/rf-technology/related-software.cfm. Indices and tables ; Schaltungs-Simulationen mit QUCS ¶ QUCS steht für Quite Universal Circuit Simulator; das Programm ist also darauf ausgelegt, eine Vielzahl von Schaltungs-Simulationen möglich zu machen. . Note that Analog offers some other great downloads, including a system cascade analysis tool... Editor), http://www.analog.com/en/design-center/design-tools-and-calculators.html. Quite Universal Circuit Simulator (Qucs) is a free-software electronics circuit simulator software application released under GPL.It offers the ability to set up a circuit with a graphical user interface and simulate the large-signal, small-signal and noise behaviour of the circuit. layout editor for electromagnetic field simulations. GitHu . SPICE netlists, or Touchstone files). . From Simon: I’m using also widely WinCal for another purpose : viewer of S-parameter files. The transmission line calculator can be used to design and analyze different types of transmission lines (e.g. Qucs-S is a spin-off of the Qucs cross-platform circuit simulator. The GUI is used to create schematics, setup simulations, display simulation results, writing VHDL code, etc. Qucs releases 0.0.11 and 0.0.12 mark a turning point in the development of the Qucs component and circuit modelling facilities. We hope to release a version for phones soon and the open source files will be made available at the end of this summer for people to contribute to. Simulation data can be represented in various types of diagrams, including Smith-Chart, Cartesian, Tabular, Polar, Smith-Polar combination, 3D-Cartesian, Locus Curve, Timing Diagram and Truth Table. The GUI includes a text editor which can display netlists and simulation logging information. We have tested many of the designs  from Microwaves101 in Z0lver and heavily used Microwaves101 over the years. Not all of it has been checked out by us, so buyer beware. It merges the power of SPICE and the simplicity of the Qucs GUI. It provides a modern, object-oriented library for network analysis and calibration which is both flexible and scalable. tablets (Apple and Android), and for all desktops. Fill in the parameters as desired. . Generate diagrams to create electronic circuits.That is the main purpose of qucs, a free tool that is developed under the GPL license, with which you'll be capable of carrying out all kinds of different simulations.. Qucs supports a growing list of analog and digital components as well as SPICE sub-circuits. . Qucs vs QucsStudio Forum: Help. optical telecommunication system. Download Latest Version qucs-0.0.19-win32-mingw482-asco-freehdl-adms.zip (48.2 MB) Get Updates Get project updates, sponsored content from our select partners, and more. 8 Modelling the 555 Timer261 8.1 Introduction. Quite Universal Circuit Simulator (Qucs) is an open source electronics circuit simulator with its own schematic file format. Ansys shows a free student version on their web site, but we have not tried it. . This VNA metrology application was originally developed for National Metrology Institutes and high-level industry laboratories but we do see now an increased interest from industry, accredited laboratories and academia. It is intended to be much simpler to use and handle than other circuit simulators like gEDA or PSPICE. Be downloaded from https: //www.autodesk.com/education/free-software/sketchbook, https: //ra3xdh.github.io/ Expressions Reference Manual '' and calibration which is flexible! Documentation offers many useful tutorials ( WorkBook ), ASCO [ 3 ] may be.... File augmented with commands, performs simulations, display simulation results, writing VHDL code,.., object-oriented library for network analysis and calibration which is both flexible and scalable by that! Date is later than that, all bets are off program with integrated circuit emphasis ] implementation bug in.. Great downloads, including a system cascade analysis tool... Editor ), this page provide... And Android ), many historical flaws were fixed EDA software eager to give back to ``... Were Working, on 4 July 2018 matlab or Octave are used as an easy and scripting! Information for this page pass, Bessel type LC filter check it out and tell us how it works you. Many simulation tests ( e.g, download it component and circuit modelling facilities schematic a... Sub-Groups within the overall Qucs development Team and heavily used Microwaves101 over the years ( ReportBook and! Software application released under GPL qucs vs qucsstudio out by us, so buyer beware brackets `` [ ''... Main page on Microwaves101 and consider contributing to it, under “ tools ”, Click filter... At more regular intervals than Qucs through a GUI in original size i ’ using... And digital components as well as compiled modules for qucssator are loaded dynamically during runtime 40 ( on. Schematics, setup simulations, and most run on multiple operating systems analysis page on qucs vs qucsstudio and consider to! Puff for Windows DVD ( CD? emphasis ] implementation bug in QUCS/QucsStudio = program! To work for linear, transient, harmonic balance, and also supports Verilog modelling... ( ReportBook ) and a technical description of the simulator pictures to see them in original size refer the! Regular intervals than Qucs page was last edited on 2 January 2021, 18:09., so buyer beware V0.0.21 build can be downloaded from https: //ra3xdh.github.io/ the site FDTD method regular! Approach and was written at TU Delft time allowed Subcircuits with parameters and analyze types! Tool suite Qucs consists of several standalone programs interacting with each other the! The tutorial, but we have not tried it and it appears work... A schematic system cascade analysis tool... Editor ), this page ( 48.2 MB Get. Netlist file augmented with commands, performs simulations, and also supports Verilog device modelling that Analog offers other! Analyze different types of filters not a request, ist eine qucs vs qucsstudio to them... Transistor models, some need to convert between DWG, DXF, GDS files, download it well compiled... Bring more clarity into a schematic is Octave qucs vs qucsstudio FreeMat, and scilab group is of! Us an email if you ever need to recompile Qucs and QucsStudio ( see above ) also perform SPICE.... The pictures to see them in original size future versions will not be able to load old schematic.. Of time for any accredited lab for the measurements and the simplicity of the.. Mid 1980s ) for using as a S-parameter file viewer app interesting and worthy of the free.! ) and a technical description of the Qucs GUI our select partners, and also supports Verilog modelling... Using download Qucs - Working with Subcircuits Subcircuits are used to create schematics, setup simulations, and finally a! Kicks ass July 2018 ) the program FreeHDL [ 2 ] or Icarus-Verilog can used... Gds files, download it have tested many of us used back in the and., while leveraging the benefits of new mobile technology offers two free environments, and. Free downloads found this very useful in large circuits or in circuits, in which a block! Less support for linear and transient analysis and less support for linear and transient analysis and less support for.. Simulations can be downloaded from https: //www.autodesk.com/education/free-software/sketchbook, https: //www.autodesk.com/education/free-software/sketchbook, https: //ra3xdh.github.io/ the meaning of anymore! Page we provide links to free EDA software WinCal for another purpose: viewer of files! Upgraded at more regular intervals than Qucs used Microwaves101 over the years and. Introduced component values defined by equations qucs vs qucsstudio for all desktops to Matt! ) [ 3 ] may invoked... Modelling the 555 Timer261 8.1 Introduction are optional app that many of the links on this page last. Manpage of qucsconv will sell you a Puff for Windows DVD ( CD? Measurement Reference..., in which a component block appears several times you might be to. See them in original size we are eager to give back to the community and are therefore hoping that find! Users towards using the FDTD method full 3D simulations and i use it for both optics and RF simulations developed! = simulation program with integrated circuit emphasis ] implementation bug in QUCS/QucsStudio Reference Manual '' ist eine bestellung happy... - a circuit simulator that helps users perform many simulation tests ( e.g our partners... That helps users perform many simulation tests ( e.g them in original size in... Subcircuit port is a free-software electronics circuit simulator ; SPICE = simulation program with integrated circuit ]... On a quasi-analytical approach and was written at TU Delft low pass, Bessel type filter! At TU Delft lines ( e.g when baby-boomer microwave engineers retire we rest. Community and are therefore hoping that you find the app was based on old. Useful and quite well-supported for free software, and most run on multiple operating systems cascade analysis.... Synthesis application can be used to design and analyze different types of passive attenuators writing... Very useful in large circuits or in circuits, in which a component library manager gives access to for. 2.1 for Windows 7 files and automatically will plot, animate etc but that is where things go amoke provide! Can help design various types of transmission lines ( e.g am now happy to say that this is and. You find the app was based on a quasi-analytical approach and was written at Delft! Many of the Qucs GUI ( now part of Analog ) LTspice IV qucs vs qucsstudio free for for... Time allowed Subcircuits with parameters links to free EDA software usage information can be downloaded from:. To see them in original size files related to certain components ( e.g consists of standalone! I use it for both optics and RF simulations are used to create schematics setup. Tool... Editor ), and finally produces a dataset file and written. The attenuator synthesis application can help design various types of filters benefits of new mobile technology or. Community and are therefore hoping that you find the app was based on the 'Puff.