# Hata Defteri vs Trigonometry 360

The clearest difference is in-app purchases: Trigonometry 360 at none against Hata Defteri's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Hata Defteri sells 2 in-app purchases, starting at $1.99 per month. Trigonometry 360 asks for nothing beyond the download.

Hata Defteri ships an update every 3 weeks, Trigonometry 360 monthly. Both last shipped on October 24, 2026.

## The numbers

| Metric | Hata Defteri | Trigonometry 360 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Monthly |
| Size | 43 MB | 54 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Cagatay EMEKCI](https://appshunter.io/developer/1889162934) | [Baran Polat](https://appshunter.io/developer/1775913614) |

## What reviewers say

### Hata Defteri

[App page](https://appshunter.io/ios/app/hata-defteri/id6775034765)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Aylık Pro Plan | $1.99 | per month |
| 1 Yıllık Pro Plan | $19.99 | per year |


### Trigonometry 360

[App page](https://appshunter.io/ios/app/trigonometry-360/id6787418306)

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

**In-app purchases:** none


## Frequently asked questions

### Is Hata Defteri free?

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

### Is Trigonometry 360 free?

Trigonometry 360 is free to download, with no in-app purchases.

### Do Hata Defteri or Trigonometry 360 have ads?

Neither Hata Defteri nor Trigonometry 360 shows ads.

### Which is updated more often, Hata Defteri or Trigonometry 360?

Hata Defteri ships an update every 3 weeks, and Trigonometry 360 monthly. Most recently, Hata Defteri was updated on October 24, 2026 and Trigonometry 360 on October 24, 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.*