# Prism vs Mark Things

The clearest difference is device support: Prism at 3 against Mark Things's 1. Mark Things's advantage is iOS requirement (17.0 vs 26.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Prism sells 1 in-app purchase, starting at $1.99 per month and Mark Things sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Prism ships an update every 11 days, Mark Things fortnightly. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Prism | Mark Things |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 11 days** | Fortnightly |
| Size | 3 MB | 162 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [剑炜 陈](https://appshunter.io/developer/1868267178) | [名 陈](https://appshunter.io/developer/1848363690) |

## What reviewers say

### Prism

[App page](https://appshunter.io/ios/app/prism-sunlight-tracker/id6758259341)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Prism Premium (Monthly) | $1.99 | per month |


### Mark Things

[App page](https://appshunter.io/ios/app/mark-things-tally-counter/id6758269471)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One-time Purchase | $1.99 | one-time |


## Frequently asked questions

### Is Prism free?

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

### Is Mark Things free?

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

### Do Prism or Mark Things have ads?

Neither Prism nor Mark Things shows ads.

### Which is updated more often, Prism or Mark Things?

Prism ships an update every 11 days, and Mark Things fortnightly. Most recently, Prism was updated on October 28, 2026 and Mark Things on October 31, 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.*