# 31Log vs Leather Project Tracker

The clearest difference is in-app purchases: 31Log at none against Leather Project Tracker's 3. Leather Project Tracker's advantage is ads (none vs shown) and update cadence (every 2 months vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Leather Project Tracker sells 3 in-app purchases, starting at $4.99 per month. 31Log asks for nothing beyond the download.

31Log ships an update every 4 months, Leather Project Tracker every 2 months. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 31Log | Leather Project Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 2 months** |
| Size | 9 MB | 11 MB |
| Requires iOS | **17.6** | 18 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Kana Uchida](https://appshunter.io/developer/1819475901) | [Karol Jaworski](https://appshunter.io/developer/1799974477) |

## What reviewers say

### 31Log

[App page](https://appshunter.io/ios/app/31log-31-day-time-lapse/id6756812361)

**Features:** macOS Compatibility

**In-app purchases:** none


### Leather Project Tracker

[App page](https://appshunter.io/ios/app/leather-project-tracker-hide/id6772819956)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hide Pro | $4.99 | per month |
| Hide Pro | $39.99 | per year |
| Hide Pro | $39.99 | per year |


## Frequently asked questions

### Is 31Log free?

31Log is free to download, with no in-app purchases.

### Is Leather Project Tracker free?

Leather Project Tracker is free to download, with in-app purchases available.

### Do 31Log or Leather Project Tracker have ads?

31Log shows ads; Leather Project Tracker does not.

### Which is updated more often, 31Log or Leather Project Tracker?

31Log ships an update every 4 months, and Leather Project Tracker every 2 months. Most recently, 31Log was updated on October 30, 2026 and Leather Project Tracker 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.*