# KOOS vs Thermmark

The clearest difference is update cadence: KOOS at weekly against Thermmark's fortnightly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

KOOS ships an update weekly, Thermmark fortnightly. The most recent releases landed on May 17, 2026 and May 15, 2026 respectively.

## The numbers

| Metric | KOOS | Thermmark |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Fortnightly |
| Size | 16 MB | 28 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Programmable Equity OU](https://appshunter.io/developer/1685180939) | [Neville Robson](https://appshunter.io/developer/1734225671) |

## What reviewers say

### KOOS

[App page](https://appshunter.io/ios/app/koos/id6449426162)

**Features:** macOS Compatibility

**In-app purchases:** none


### Thermmark

[App page](https://appshunter.io/ios/app/thermmark/id6478865191)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is KOOS free?

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

### Is Thermmark free?

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

### Do KOOS or Thermmark have ads?

Neither KOOS nor Thermmark shows ads.

### Which is updated more often, KOOS or Thermmark?

KOOS ships an update weekly, and Thermmark fortnightly. Most recently, KOOS was updated on May 17, 2026 and Thermmark on May 15, 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.*