# NoteLabZ vs Tethra.ai

The clearest difference is in-app purchases: NoteLabZ at none against Tethra.ai's 7. Tethra.ai's advantage is update cadence (every 2 weeks vs every 16 months) and iOS requirement (15.5 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Tethra.ai sells 7 in-app purchases, starting at $4.99 per 7 days. NoteLabZ asks for nothing beyond the download.

NoteLabZ ships an update every 16 months, Tethra.ai every 2 weeks. The most recent releases landed on October 28, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | NoteLabZ | Tethra.ai |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 2 weeks** |
| Size | 10 MB | 48 MB |
| Requires iOS | 18.0 | **15.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Khoa Nguyen](https://appshunter.io/developer/1054445590) | [Gitspark Technologies, LLC](https://appshunter.io/developer/1669355905) |

## What reviewers say

### NoteLabZ

[App page](https://appshunter.io/ios/app/notelabz/id6746744575)

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

**In-app purchases:** none


### Tethra.ai

[App page](https://appshunter.io/ios/app/tethraai/id6759218397)

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Weekly | $4.99 | per 7 days |
| Tethra | $14.99 | per month |
| Tethra | $99.99 | per year |
| 10,000 Credits | $0.99 | one-time |
| 50,000 Credits | $4.99 | one-time |
| 100,000 Credits | $9.99 | one-time |
| 250,000 Credits | $24.99 | one-time |


## Frequently asked questions

### Is NoteLabZ free?

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

### Is Tethra.ai free?

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

### Do NoteLabZ or Tethra.ai have ads?

Neither NoteLabZ nor Tethra.ai shows ads.

### Which is updated more often, NoteLabZ or Tethra.ai?

NoteLabZ ships an update every 16 months, and Tethra.ai every 2 weeks. Most recently, NoteLabZ was updated on October 28, 2026 and Tethra.ai on October 14, 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.*