# Lean SL vs Fasting Mastery

The clearest difference is in-app purchases: Lean SL at none against Fasting Mastery's 3. Fasting Mastery's advantage is update cadence (every 4 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Fasting Mastery sells 3 in-app purchases, starting at $1.99 per month. Lean SL asks for nothing beyond the download.

Lean SL ships an update monthly, Fasting Mastery every 4 days. The most recent releases landed on September 25, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Lean SL | Fasting Mastery |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Size | 101 MB | 73 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [AZBOW](https://appshunter.io/developer/1413105019) | [Yasiru Abeygunawardana](https://appshunter.io/developer/1886383088) |

## What reviewers say

### Lean SL

[App page](https://appshunter.io/ios/app/lean-sl/id1573515629)

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

**In-app purchases:** none


### Fasting Mastery

[App page](https://appshunter.io/ios/app/fasting-mastery/id6760818321)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Quarterly | $2.99 | per 3 months |
| Annual | $9.99 | per year |


## Frequently asked questions

### Is Lean SL free?

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

### Is Fasting Mastery free?

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

### Do Lean SL or Fasting Mastery have ads?

Neither Lean SL nor Fasting Mastery shows ads.

### Which is updated more often, Lean SL or Fasting Mastery?

Lean SL ships an update monthly, and Fasting Mastery every 4 days. Most recently, Lean SL was updated on September 25, 2026 and Fasting Mastery on September 11, 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.*