# Prism vs Seize Light

The clearest difference is in-app purchases: Seize Light at none against Prism's 1. Seize Light also leads on iOS requirement (18.0 vs 26.0). Prism's advantage is ads (none vs shown) and device support (3 vs 1). On price and update cadence there is nothing between them.

Both are free to download. Prism sells 1 in-app purchase, starting at $1.99 per month. Seize Light asks for nothing beyond the download.

Prism ships an update every 11 days, Seize Light fortnightly. The most recent releases landed on September 24, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Prism | Seize Light |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 11 days** | Fortnightly |
| Size | 3 MB | 34 MB |
| Requires iOS | 26.0 | **18.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [剑炜 陈](https://appshunter.io/developer/1868267178) | [sebastian totte](https://appshunter.io/developer/1819107580) |

## 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 |


### Seize Light

[App page](https://appshunter.io/ios/app/seize-light/id6784576883)

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

**In-app purchases:** none


## Frequently asked questions

### Is Prism free?

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

### Is Seize Light free?

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

### Do Prism or Seize Light have ads?

Seize Light shows ads; Prism does not.

### Which is updated more often, Prism or Seize Light?

Prism ships an update every 11 days, and Seize Light fortnightly. Most recently, Prism was updated on September 24, 2026 and Seize Light on September 26, 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.*