# AsthmaTuner vs Peak Flow Diary | Asthma

The clearest difference is in-app purchases: AsthmaTuner at none against Peak Flow Diary | Asthma's 2. AsthmaTuner also leads on ads (none vs shown). Peak Flow Diary | Asthma's advantage is device support (3 vs 1). On price, update cadence and iOS requirement there is nothing between them.

Both are free to download. Peak Flow Diary | Asthma sells 2 in-app purchases, starting at $3.99 per month. AsthmaTuner asks for nothing beyond the download.

AsthmaTuner ships an update fortnightly, Peak Flow Diary | Asthma every 3 weeks. The most recent releases landed on September 23, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | AsthmaTuner | Peak Flow Diary | Asthma |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (35 ratings)](https://appshunter.io/ios/app/peak-flow-diary-asthma/id6463603745/reviews)** |
| Number of ratings | — | **35** |
| Positive reviews | — | 74.2% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 185 MB | 57 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Medituner AB](https://appshunter.io/developer/1125900928) | [Keyber Inc.](https://appshunter.io/developer/1571255559) |

## What reviewers say

### AsthmaTuner

[App page](https://appshunter.io/ios/app/asthmatuner/id1353823931)

**In-app purchases:** none


### Peak Flow Diary | Asthma

[App page](https://appshunter.io/ios/app/peak-flow-diary-asthma/id6463603745)

Easily record daily peak flow values and visualize breathing changes with clear graphs. Understand your asthma trends, identify early warning signs, and support your health management. Useful for medical visits and daily care.

**Highlights:** Daily peak flow recording, Easy input methods (slider/keyboard), Zone-based graph display, Record list with memo management, Cloud storage and account support, Intuitive and simple operation

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $3.99 | per month |
| Annual Plan | $24.99 | per year |


## Frequently asked questions

### Is AsthmaTuner free?

AsthmaTuner is free to download, with no in-app purchases.

### Is Peak Flow Diary | Asthma free?

Peak Flow Diary | Asthma is free to download, with in-app purchases available.

### Do AsthmaTuner or Peak Flow Diary | Asthma have ads?

Peak Flow Diary | Asthma shows ads; AsthmaTuner does not.

### Which is updated more often, AsthmaTuner or Peak Flow Diary | Asthma?

AsthmaTuner ships an update fortnightly, and Peak Flow Diary | Asthma every 3 weeks. Most recently, AsthmaTuner was updated on September 23, 2026 and Peak Flow Diary | Asthma on September 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*