# OThree AI vs Prysm AI

The clearest difference is in-app purchases: Prysm AI at none against OThree AI's 1. Prysm AI also leads on update cadence (every 2 days vs every 9 days). OThree AI's advantage is iOS requirement (18.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. OThree AI sells 1 in-app purchase, starting at $14.99 per month. Prysm AI asks for nothing beyond the download.

OThree AI ships an update every 9 days, Prysm AI every 2 days. Both last shipped on October 30, 2026.

## The numbers

| Metric | OThree AI | Prysm AI |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 2 days** |
| Monetization | Freemium | — |
| Size | 1.7 GB | 2 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Seven Delta Seven LLC](https://appshunter.io/developer/1782302903) | [Andrew Bierman](https://appshunter.io/developer/1742901425) |

## What reviewers say

### OThree AI

[App page](https://appshunter.io/ios/app/othree-ai-fast-private-chat/id6740998410)

This AI chat application provides instant answers and assistance using advanced language models. It offers both offline and cloud-based access, prioritizing user privacy with a zero-data-storage policy. Enjoy seamless compatibility across Apple devices for a convenient AI experience.

**Highlights:** Offline Large Language Model, Ultra-fast Cloud LLM, Zero-data storage privacy, Universal Apple device compatibility, Quick answers and brainstorming, Drafting emails and documents

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OThree Premium | $14.99 | per month |


### Prysm AI

[App page](https://appshunter.io/ios/app/prysm-ai/id6754121721)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OThree AI free?

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

### Is Prysm AI free?

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

### Do OThree AI or Prysm AI have ads?

Neither OThree AI nor Prysm AI shows ads.

### Which is updated more often, OThree AI or Prysm AI?

OThree AI ships an update every 9 days, and Prysm AI every 2 days. Most recently, OThree AI was updated on October 30, 2026 and Prysm AI on October 30, 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.*