# Worry Stone AI vs Thrum

The clearest difference is update cadence: Thrum at every 2 days against Worry Stone AI's every 4 months. Worry Stone AI's advantage is iOS requirement (14.0 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Worry Stone AI sells 1 in-app purchase, starting at $1.99 per 7 days and Thrum sells 4 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Worry Stone AI ships an update every 4 months, Thrum every 2 days. The most recent releases landed on October 28, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Worry Stone AI | Thrum |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 days** |
| Size | 28 MB | 14 MB |
| Requires iOS | **14.0** | 18.0 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Qingdao Ruineng Lighting Co., Ltd.](https://appshunter.io/developer/1848496765) | [Arif OZELCI](https://appshunter.io/developer/1768734602) |

## What reviewers say

### Worry Stone AI

[App page](https://appshunter.io/ios/app/worry-stone-ai-focus-and-calm/id6772008921)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 周付 | $1.99 | per 7 days |


### Thrum

[App page](https://appshunter.io/ios/app/thrum-adhd-focus-timer/id6776406494)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Thrum Pro — Monthly | $3.99 | per month |
| Thrum Pro Yearly | $29.99 | per year |
| Thrum Pro — Yearly | $29.99 | per year |
| Thrum Pro — Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is Worry Stone AI free?

Worry Stone AI is free to download, with in-app purchases available.

### Is Thrum free?

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

### Do Worry Stone AI or Thrum have ads?

Neither Worry Stone AI nor Thrum shows ads.

### Which is updated more often, Worry Stone AI or Thrum?

Worry Stone AI ships an update every 4 months, and Thrum every 2 days. Most recently, Worry Stone AI was updated on October 28, 2026 and Thrum on November 4, 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.*