# Self vs Peak Flow Log

The clearest difference is in-app purchases: Self at none against Peak Flow Log's 1. Self also leads on update cadence (every 2 weeks vs every 5 weeks) and iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Peak Flow Log sells 1 one-off in-app purchase. Self asks for nothing beyond the download.

Self ships an update every 2 weeks, Peak Flow Log every 5 weeks. The most recent releases landed on November 4, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Self | Peak Flow Log |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (1 ratings)](https://appshunter.io/ios/app/peak-flow-log-asthma-diary/id6794622470/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 5 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 36 MB | 2 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Marharyta Paliakova](https://appshunter.io/developer/1728381724) | [Yoshifumi Sato](https://appshunter.io/developer/6780413827) |

## What reviewers say

### Self

[App page](https://appshunter.io/ios/app/self-care-space/id6476960748)

**Features:** macOS Compatibility

**In-app purchases:** none


### Peak Flow Log

[App page](https://appshunter.io/ios/app/peak-flow-log-asthma-diary/id6794622470)

Record your peak flow readings and visualize your asthma zones. Log reliever puffs, symptoms, and triggers to track trends and generate PDF reports for your doctor. Your data stays private and works offline.

**Highlights:** Visualize asthma zones (Green, Yellow, Red), Log reliever puffs, symptoms, and triggers, Track trends over time, Create shareable PDF reports, Offline functionality, Multi-user support

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Peak Flow Log Pro | $3.99 | one-time |


## Frequently asked questions

### Is Self free?

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

### Is Peak Flow Log free?

Peak Flow Log is free to download, with in-app purchases available.

### Do Self or Peak Flow Log have ads?

Neither Self nor Peak Flow Log shows ads.

### Which is updated more often, Self or Peak Flow Log?

Self ships an update every 2 weeks, and Peak Flow Log every 5 weeks. Most recently, Self was updated on November 4, 2026 and Peak Flow Log on October 31, 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.*