# PeakFlow vs Spar Log

The clearest difference is in-app purchases: Spar Log at none against PeakFlow's 5. Spar Log also leads on device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. PeakFlow sells 5 in-app purchases, starting at $9.99 per month. Spar Log asks for nothing beyond the download.

PeakFlow ships an update every 5 days, Spar Log every 8 days. The most recent releases landed on October 24, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | PeakFlow | Spar Log |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (14 ratings)](https://appshunter.io/ios/app/peakflow-health-optimization/id6756493991/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 8 days |
| Monetization | Free with in-app purchases | — |
| Size | 23 MB | 68 MB |
| Requires iOS | 16.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Alfred Caillard--Laniepce](https://appshunter.io/developer/1860915283) | [Liam Burton](https://appshunter.io/developer/1867035300) |

## What reviewers say

### PeakFlow

[App page](https://appshunter.io/ios/app/peakflow-health-optimization/id6756493991)

This app helps you build effective habits by providing personalized, science-backed recommendations based on your lifestyle and goals. It uses data to show you which habits improve your sleep, energy, focus, and performance, offering clarity without hype.

**Highlights:** Personalized habit recommendations, Science-backed protocols, Daily wellness check-ins, Habit impact analytics, Streak tracking, Community challenges

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly 9.99 | $9.99 | per month |
| Monthly | $12.99 | per month |
| Yearly | $29.99 | per year |
| Yearly | $39.99 | per year |
| Yearly 49.99 | $49.99 | per year |


### Spar Log

[App page](https://appshunter.io/ios/app/spar-log/id6757500469)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PeakFlow free?

PeakFlow is free to download, with in-app purchases available.

### Is Spar Log free?

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

### Do PeakFlow or Spar Log have ads?

Neither PeakFlow nor Spar Log shows ads.

### Which is updated more often, PeakFlow or Spar Log?

PeakFlow ships an update every 5 days, and Spar Log every 8 days. Most recently, PeakFlow was updated on October 24, 2026 and Spar 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.*