# Signal Path — Record and view spectrums > Performant spectrum viewing and recording app for audio analysis. (iPhone/iPad app by Toomas Vahter.) - Source: https://appshunter.io/ios/app/signal-path/id1210488485 (this page in markdown: same URL + `.md`) - Developer: [Toomas Vahter](https://appshunter.io/developer/1210488484) - Category: Music, Utilities - Price: $8.99 - Rating: 3.00/5 from 2 App Store ratings · 6 written reviews indexed - Age rating: 4+ - Requires: iOS 18.0 · 4 MB - Languages: American English - Released: 2017-03-06 - Data updated: 2026-08-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/signal-path/id1210488485/reviews.md ## What is Signal Path? Signal Path is the most performant spectrum viewing app with beautiful user interface. You can record audio spectrums using microphone and replay them or open large recordings containing I/Q data. Inspect spectrums Spectrums can be selected using two finger drag gesture. Tapping on histogram reveals amplitude value of the selected frequency bin. Adjust thresholds Signal Path automatically expands amplitude threshold range when viewing spectrums. You can also set custom amplitude thresholds if needed. Keeping file size under control Signal Path can set a maximum file size for recording after which file is recreated. Can open wav files and save recorded audio as wav Supported interleaved raw I/Q data formats Float, int8, int16, int32, uInt8, uInt16, and uInt32 Fast Fourier transform lengths 256, 512, 1024, 2048, 4096, 8192 Window functions Rectangular, Blackman, Hamming, and Hann ## Key features - Record audio spectrums - Inspect spectrums with two-finger drag - Adjust amplitude thresholds - Manage recording file size - Open and save WAV files - Supports raw I/Q data formats - Multiple FFT lengths and window functions ## Recent user reviews (6 of 6) All indexed reviews: https://appshunter.io/ios/app/signal-path/id1210488485/reviews.md ### 3/5 — Fair Enough *2024-05-30* The app in itself is fair enough but there are limitations. First nowhere to be found is help, maybe I’m missing something but I searched and searched to no avail. Second is recording playback. I can record fine but when I try to playback all I get is about a fraction of a second of sound. Again, am I missing something? No instructions anywhere on learning the app’s functions? Again, again, am I missing something? Need help.. ### 3/5 — works well enough, but has some inconveniences *2024-05-11* I wanted to use this app to find the source of a high-pitched whine in my apartment, but it doesn't let you scroll left/right while recording, so I couldn't see the higher frequencies unless I stopped recording. I was able to figure it out, but it was inconvenient... It's also not obvious to me how you select a time range in the graph; it seems to be related to tapping with two fingers, but I can't do it reliably. Anyway, time to move the noisy thing to a different room :p thanks for the app ### 5/5 — Immensely helpful! *2024-04-21* Tried my hand at doing the Peacekeeper Easter Egg for Battlefield 1 on PS4 and had no luck decoding it by ear, so after seeing the video on the page for this app and what looked like Morse Code in the spectrogram (I know it’s just the music but I was getting desperate) I bought this and there it was, clear as day! Couldn’t have gotten An Escalation, An Omen and soon A Beginning without it. Worth every penny just for that alone, but UI and the ability to save recordings into Files is very helpful. ### 1/5 — Bull crap *2023-05-20* Nothing but a file folder ap doesn’t work at all should get my money back do not buy **Developer response:** Signal Path is a file based app for recording and reading data from files. New recordings can be created by tapping on the + button in the file selection/creation view. ### 1/5 — Crashes when creating a new audio recording *2018-11-06* Really promising app, unfortunately it crashes when you try to create a new audio recording from the menu. A fix would be greatly appreciated for a $9 app! **Developer response:** Thank you for reporting it and I am sorry for encountering this. This issue is fixed in version 1.5. ### 1/5 — Can’t open pre-recorded files *2018-03-18* Wasn’t clear from the description (since it said "import from any source") but the app won’t import a pre-recorded file. There is no help file, nor documentation. Tried .wav, mp3, and m4p without luck. **Developer response:** It does support wav files in recent versions. The description was not as clear as it should have been. ## Frequently asked questions about Signal Path ### What is Signal Path? Signal Path is a mobile application designed for recording and viewing audio spectrums. It offers a high-performance spectrum viewing experience with a user-friendly interface. ### How do I inspect spectrums in Signal Path? You can select spectrums by using a two-finger drag gesture. Tapping on the histogram will reveal the amplitude value of the selected frequency bin. ### Can Signal Path record audio spectrums? Yes, Signal Path allows you to record audio spectrums using your device's microphone. You can then replay these recordings or open large files containing I/Q data. ### What I/Q data formats does Signal Path support? Signal Path supports various interleaved raw I/Q data formats, including Float, int8, int16, int32, uInt8, uInt16, and uInt32. ### Does Signal Path have ads? No, Signal Path does not contain advertisements. It is a paid application that offers an ad-free experience. ### What is the price of Signal Path? Signal Path is available for purchase at $8.99. This is a one-time payment for the application. ### On which devices can I use Signal Path? Signal Path is compatible with Mac, iPhone, and iPad devices, allowing for cross-platform use. ### How often is Signal Path updated? The latest version of Signal Path is 2.9, and it was last updated on March 10, 2025. Updates are released periodically to improve performance and add features. ## Version history (last 5 releases) ### 2.9 — 2025-03-10 • Performance and compatibility improvements ### 2.8.1 — 2025-01-04 • Performance and compatibility improvements ### 2.8 — 2024-12-30 • Performance and compatibility improvements ### 2.7 — 2023-08-08 Performance and compatibility improvements ### 2.6.1 — 2021-08-08 • Stability and performance improvements ## Apps similar to Signal Path | App | Rating | Price | Category | | --- | --- | --- | --- | | [TotalMix Remote for iPad](https://appshunter.io/ios/app/totalmix-remote-for-ipad/id1345471593) | 4.3 (16) | Free | Music | | [Chordio: compose & learn music](https://appshunter.io/ios/app/chordio-compose-and-learn-music/id1580214821) | 4.4 (8) | Free | Music | | [MIDI Layers](https://appshunter.io/ios/app/midi-layers/id1640217767) | 4.7 (13) | $7.99 | Music | | [n-Track Tuner Pro](https://appshunter.io/ios/app/n-track-tuner-pro/id662934229) | 4.8 (91) | $12.99 | Music | | [Auricula: Interval Ear Trainer](https://appshunter.io/ios/app/auricula-interval-ear-trainer/id899590502) | 4.8 (71) | Free | Music | | [Avantis OneMix](https://appshunter.io/ios/app/avantis-onemix/id1482133499) | 2.7 (3) | Free | Music | ## More apps by Toomas Vahter - [Drifty Asteroid](https://appshunter.io/ios/app/drifty-asteroid/id1350678294) - [Silky Brew](https://appshunter.io/ios/app/silky-brew/id1640480648) All apps by Toomas Vahter: https://appshunter.io/developer/1210488484 ## Related topics [stochastic signal processing](https://appshunter.io/ios/topics/stochastic-signal-processing) --- *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 2026-08-10.*