243+ iOS apps curated and reviewed
Out of 243+ signal processing apps on iOS, 18 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 4.7★ (6) | No | No | Oct 2026 | |
| 2 |  | $19.99 | 5.0★ (7) | No | No | Oct 2026 | |
| 3 |  | Free | 4.7★ (1.1M) | No | Yes | Nov 2026 | |
| 4 |  | Free | 4.8★ (30K) | No | No | Nov 2026 | |
| 5 |  | Free | 5.0★ (27) | No | No | Oct 2026 | |
| 6 |  | Free | — | No | Yes | Oct 2026 | |
| 7 |  | Free | 4.5★ (31) | No | Yes | Nov 2026 | |
| 8 |  | Free | 4.2★ (34) | No | Yes | Nov 2026 |
Explore the processing of random signals like speech, music, and climate data. This interactive textbook offers dynamic information, films, animations, and 59 real-time laboratory experiments using your device's camera and microphone. It's designed for those with prior signal processing and probability theory knowledge.
This vintage-style audio processing plugin generates unique sounds by combining two signals with complex math. It functions as a tone generator, distortion unit, or multimode filter, encouraging sonic exploration.
A secure messaging app prioritizing privacy with end-to-end encryption for texts, voice, and video calls. It offers group chats, disappearing stories, and file sharing, all without collecting user data. This non-profit service is funded by donations.
