245+ iOS apps curated and reviewed
Out of 245+ signal processing apps on iOS, 19 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 | Sep 2026 | |
| 2 |  | $19.99 | 5.0★ (7) | No | No | Sep 2026 | |
| 3 |  | Free | 4.7★ (1.1M) | No | Yes | Oct 2026 | |
| 4 |  | Free | 5.0★ (24) | No | No | Sep 2026 | |
| 5 |  | Free | 4.8★ (29K) | No | No | Oct 2026 | |
| 6 |  | Free | 4.2★ (27) | No | Yes | Sep 2026 | |
| 7 |  | Free | — | No | No | May 2026 | |
| 8 |  | Free | 4.3★ (91) | Yes | Yes | Sep 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.
This messaging app prioritizes your privacy with strong end-to-end encryption for all communications. It offers free text, voice, and video messaging, including group chats and disappearing stories, all without collecting your data.
