AIRtimer vs Quad Notes
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AIRtimer
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The main features: - Writing programs to an AIRtimer - Reading programs from an AIRtimer - Displays an altitudes charts
Quad Notes
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Displays four notes in a grid.
Screenshots
Verdict
The clearest difference is ads: AIRtimer at none against Quad Notes's shown. AIRtimer also leads on iOS requirement (9.0 vs 15.8.3). Quad Notes's advantage is update cadence (every 2 weeks vs every 3 months). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
AIRtimer ships an update every 3 months, Quad Notes every 2 weeks. The most recent releases landed on September 9, 2026 and August 3, 2026 respectively.
| Parameter | AIRtimer | Quad Notes |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 15.8.3 |
| Further details — not scored | ||
| Size | 51 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Mioris LTD | Hideaki Uchikoshi |
In-app purchases
AIRtimer
No in-app purchases
Quad Notes
No in-app purchases
