# Mastery vs DecisionLog

The clearest difference is price: DecisionLog at Free against Mastery's $1.99. DecisionLog also leads on update cadence (every 2 days vs every 9 days). Mastery's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

DecisionLog is free to download; Mastery costs $1.99 up front. DecisionLog sells 1 one-off in-app purchase. Mastery asks for nothing beyond the download.

Mastery ships an update every 9 days, DecisionLog every 2 days. The most recent releases landed on October 9, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Mastery | DecisionLog |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 9 days | **Every 2 days** |
| Size | 37 MB | 6 MB |
| Requires iOS | **15.1** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Benny Jien](https://appshunter.io/developer/1850407151) | [DENIS DANIEL NASTIC](https://appshunter.io/developer/1868500666) |

## What reviewers say

### Mastery

[App page](https://appshunter.io/ios/app/mastery-skill-tracker/id6754836317)

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

**In-app purchases:** none


### DecisionLog

[App page](https://appshunter.io/ios/app/decisionlog-think-better/id6757722931)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DecisionLog Pro | $2.99 | one-time |


## Frequently asked questions

### Is Mastery free?

Mastery costs $1.99, with no in-app purchases.

### Is DecisionLog free?

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

### Do Mastery or DecisionLog have ads?

DecisionLog shows ads; Mastery does not.

### Which is updated more often, Mastery or DecisionLog?

Mastery ships an update every 9 days, and DecisionLog every 2 days. Most recently, Mastery was updated on October 9, 2026 and DecisionLog on October 12, 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.*