SimpleFFT vs Mix Notes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SimpleFFT
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This app can easily analyze the frequency of sound. For the sound of the recording file recorded at each refresh time interval, FFT is executed and displayed for the four voices collected one after another at each refresh interval.
Mix Notes
Record voice notes and add annotations to audio tracks with a single touch. Compare different mixes using AB mode and ensure your notes are saved directly to the track. Easily manage and delete notes as needed.
- One-touch annotation
- Voice note recording
- AB mix comparison
- Notes stored with track
- Swipe to delete notes
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One touch annotation for audio and AB mixes. Easily make mix notes with a single button press, record voice notes at specific times. Use AB mode to compare two mixes. Never lose track of your notes, they're stored against the track until you swipe to delete.
Screenshots
Verdict
The clearest difference is in-app purchases: Mix Notes at none against SimpleFFT's 1. Mix Notes also leads on update cadence (every 10 days vs every 18 months). SimpleFFT's advantage is iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. SimpleFFT sells 1 one-off in-app purchase. Mix Notes asks for nothing beyond the download.
SimpleFFT ships an update every 18 months, Mix Notes every 10 days. The most recent releases landed on August 28, 2026 and September 13, 2026 respectively.
| Parameter | SimpleFFT | Mix Notes |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 18 months | Every 10 days — better |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 5 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | HIROFUMI MARUO | David Robert Thomas |
In-app purchases
SimpleFFT
- Premium Functions$0.49
Mix Notes
No in-app purchases
