# Fourier Synthesiser > Educational tool for studying Fourier components of periodic waveforms. (iPhone/iPad app by Paul Watkinson.) - Source: https://appshunter.io/ios/app/fourier-synthesiser/id1452797075 (this page in markdown: same URL + `.md`) - Developer: [Paul Watkinson](https://appshunter.io/developer/571615704) - Category: Education - Price: $1.99 with in-app purchases - Rating: 2.00/5 from 2 App Store ratings · 2 written reviews indexed - Age rating: 17+ - Requires: iOS 13.1 · 1 MB - Languages: American English - Released: 2019-02-16 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/fourier-synthesiser/id1452797075/reviews.md ## What is Fourier Synthesiser? Fourier Synthesiser allows students, engineers and musicians to study quantitatively the Fourier components of periodic waveforms. Real-time superposition of harmonically related sinusoids up to the 50th harmonic can be viewed with the built in Time Domain display. Features: Select Sine and Cosine from fundamental to the 50th harmonic
. See how convergence to the ideal improves with more components Fundamental frequency adjustable from 50Hz to 1kHz Individually control amplitude and On/Off state of each harmonic DC term available on iPad display Select from a range of 10 preset waveforms 
Square, Triangle, Sawtooth, Amplitude Modulation, Impulse, Half and Full Wave Rectification Audio stereo output of a single component or the fully synthesised waveform. Change the phase of any or all coefficients and observe the changes either on-screen or externally with an oscilloscope. Audiophiles - listen in stereo whilst observing the drastic changes in waveform due to phase shifts in any waveform component. ## Key features - Study Fourier components of periodic waveforms - Real-time superposition of sinusoids up to 50th harmonic - Adjustable fundamental frequency (50Hz-1kHz) - Control amplitude and phase of each harmonic - Select from 10 preset waveforms - Stereo audio output of synthesized waveforms ## Pricing and in-app purchases Base price: $1.99. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Phase Shift / Audio Out | $0.99 | one-time | ## Recent user reviews (2 of 2) All indexed reviews: https://appshunter.io/ios/app/fourier-synthesiser/id1452797075/reviews.md ### 3/5 — ??? *2021-01-29, version 3.1.0* A bit hard to figure out. Does not yet (?) have fundamental frequencies other than 200Hz. At least not that I can find. ### 1/5 — In app purchase required for audio output *2020-05-23, version 3.0.0* In other words: garbage app. ## Frequently asked questions about Fourier Synthesiser ### What is Fourier Synthesiser used for? Fourier Synthesiser allows users to quantitatively study the Fourier components of periodic waveforms. It's designed for students, engineers, and musicians to visualize and manipulate waveform synthesis. ### What devices is Fourier Synthesiser compatible with? Fourier Synthesiser is available for iPhone, iPad, and iPod. ### How much does Fourier Synthesiser cost? Fourier Synthesiser is a paid application, priced at $1.99. ### What is the age rating for Fourier Synthesiser? Fourier Synthesiser has an age rating of 17+, indicating mature content or themes. ### When was Fourier Synthesiser last updated? The latest version of Fourier Synthesiser, 3.1.0, was last updated on October 13, 2020. ### Can I adjust the phase of waveform components in Fourier Synthesiser? Yes, you can individually control the phase of any or all coefficients to observe changes on-screen or externally with an oscilloscope. ### Does Fourier Synthesiser offer offline functionality? The description does not specify offline functionality, but its core features involve real-time analysis and synthesis which may require an active session. ### What is the user sentiment for Fourier Synthesiser based on ratings? Fourier Synthesiser has a low rating of 2.0 stars from 2 ratings, suggesting potential user dissatisfaction or a niche audience. ## Version history (last 5 releases) ### 3.1.0 — 2020-10-13 Minor bug fixes. Dark mode improvements. ### 3.0.0 — 2020-03-29 Update for iOS13 ### 2.0.2 — 2019-03-22 Minor bug fix for split audio channels ### 2.0.1 — 2019-03-14 Extra features available via In App Purchase, additions include - Audio stereo output of a single harmonic or the fully synthesised waveform. Change the phase of any or all coefficients and observe the changes either on-screen or externally with an oscilloscope. Now for all Audiophiles out there - listen in stereo whilst observing the drastic changes in waveform due to phase shifts in any waveform component. Vary fundamental frquency 50Hz - 1kHz. Optimised for all iPads, iPhone 6 and above ### 1.1.3 — 2019-02-16 Minor bug fixes. Coefficient locked by default, long press to unlock Freq Domain - less sensitivity on Long Press + Drag up/down allows locking of current selection before moving to next coefficient ## Apps similar to Fourier Synthesiser | App | Rating | Price | Category | | --- | --- | --- | --- | | [Expemo](https://appshunter.io/ios/app/expemo/id1181428787) | 2.3 (6) | Free | Education | | [DK Visual Dictionary (2017)](https://appshunter.io/ios/app/dk-visual-dictionary-2017/id1192278999) | 1.8 (34) | Free | Education | | [Everything Machine by Tinybop](https://appshunter.io/ios/app/everything-machine-by-tinybop/id1001244846) | 4.4 (104) | $3.99 | Education | | [MimioMobile](https://appshunter.io/ios/app/mimiomobile/id584929719) | 3.8 (4) | Free | Education | | [C++ Compiler - Run .cpp Code](https://appshunter.io/ios/app/c-plus-plus-compiler-run-cpp-code/id1546361947) | 4.0 (2) | Free | Education | | [Integral Calculator with Steps](https://appshunter.io/ios/app/integral-calculator-with-steps/id1593386062) | 3.8 (23) | Free | Education | ## More apps by Paul Watkinson - [YMMV](https://appshunter.io/ios/app/ymmv/id1354146245) All apps by Paul Watkinson: https://appshunter.io/developer/571615704 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*