# OThree AI vs microAI

The clearest difference is iOS requirement: microAI at 16.4 against OThree AI's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. OThree AI sells 1 in-app purchase, starting at $14.99 per month and microAI sells 4 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 9 days. The most recent releases landed on October 18, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | OThree AI | microAI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/microai/id6744488702/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | Every 9 days |
| Monetization | Freemium | Free with in-app purchases |
| Size | 1.7 GB | 234 MB |
| Requires iOS | 18.0 | **16.4** |
| Devices | **iPhone, iPad, Mac** | iPhone, Mac |
| Age rating | 17+ | 9+ |
| Developer | [Seven Delta Seven LLC](https://appshunter.io/developer/1782302903) | [genghong Xie](https://appshunter.io/developer/1785558382) |

## 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 |


### microAI

[App page](https://appshunter.io/ios/app/microai/id6744488702)

This app provides a private, local AI workspace that organizes your thoughts, projects, and files. It allows you to run AI chat on your device, manage AI models, and build a personal memory system for enhanced productivity and offline use.

**Highlights:** Private Memory Map, Local AI Chat, Long-Term Memory, Projects With Context, Chat With Local Files, Private Journal, GGUF Model Management

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| microAI Pro – Monthly | $0.99 | per month |
| microAI Pro – Yearly | $5.99 | per year |
| Remove Ads | $4.99 | one-time |
| microAI Pro – Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is OThree AI free?

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

### Is microAI free?

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

### Do OThree AI or microAI have ads?

Neither OThree AI nor microAI shows ads.

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

OThree AI ships an update every 9 days, and microAI every 9 days. Most recently, OThree AI was updated on October 18, 2026 and microAI on October 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*