# Sisyphus Tasks vs Tethra.ai

The clearest difference is in-app purchases: Sisyphus Tasks at none against Tethra.ai's 7. Tethra.ai's advantage is update cadence (every 2 weeks vs every 2 months) and device support (3 vs 1). On price and ads there is nothing between them.

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

Sisyphus Tasks ships an update every 2 months, Tethra.ai every 2 weeks. The most recent releases landed on October 12, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Sisyphus Tasks | Tethra.ai |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/sisyphus-tasks/id6447134957/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 30 MB | 48 MB |
| Requires iOS | 18.0 | **15.5** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Gregor Hermanowski](https://appshunter.io/developer/1532765185) | [Gitspark Technologies, LLC](https://appshunter.io/developer/1669355905) |

## What reviewers say

### Sisyphus Tasks

[App page](https://appshunter.io/ios/app/sisyphus-tasks/id6447134957)

This app helps you manage your tasks and events in one place, offering quick ways to add, edit, and organize your schedule. It provides customizable alerts and powerful search to ensure you never forget important items.

**Highlights:** Drag and drop event management, Quick event creation, Duplicate events for schedules, Contextual actions for common tasks, Automatic task sorting, Customizable alerts, Powerful search functionality

**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 Sisyphus Tasks free?

Sisyphus Tasks 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 Sisyphus Tasks or Tethra.ai have ads?

Neither Sisyphus Tasks nor Tethra.ai shows ads.

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

Sisyphus Tasks ships an update every 2 months, and Tethra.ai every 2 weeks. Most recently, Sisyphus Tasks was updated on October 12, 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.*