250+ iOS apps curated and reviewed
Out of 250+ frequency counter+ hz fft apps on iOS, 15 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 | 3.3★ (6) | Yes | No | Oct 2026 | |
| 2 |  | Free | — | No | Yes | Jun 2026 | |
| 3 |  | Free | 4.7★ (340) | Yes | No | Oct 2026 | |
| 4 |  | Free | — | No | No | Jul 2026 | |
| 5 |  | $2.99 | — | No | No | Jun 2026 | |
| 6 |  | Free | — | No | Yes | Sep 2026 | |
| 7 |  | Free | — | Yes | No | May 2026 | |
| 8 |  | Free | — | Yes | No | Aug 2026 |
This app transforms your iPhone into a powerful audio analyzer. It offers four distinct modes to measure sound frequencies, tune instruments, analyze motor speeds, and check mains stability. Advanced features include measurement history, comparison tools, and CSV export.
Generate various sound waves, including sine, square, sawtooth, and triangle, with adjustable frequencies from 1Hz to 22000Hz. Visually observe animated sound waves and control volume. Useful for testing hearing, speakers, instruments, and even cleaning water from speakers.
