# OThree AI vs LocalEngine

The clearest difference is review sentiment: LocalEngine at 100% against OThree AI's 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 LocalEngine sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

OThree AI ships an update every 9 days, LocalEngine every 5 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | OThree AI | LocalEngine |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 5 days** |
| Monetization | Freemium | Free with in-app purchases |
| Size | 1.7 GB | 43 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Mac |
| Age rating | 17+ | 12+ |
| Developer | [Seven Delta Seven LLC](https://appshunter.io/developer/1782302903) | [GUOYU WANG](https://appshunter.io/developer/1873302677) |

## 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 |


### LocalEngine

[App page](https://appshunter.io/ios/app/localengine-think-tank/id6779024828)

Run open-source AI language and vision models entirely on your device. Engage in private, offline conversations, analyze images, and download various models without sending data to any server. Unlock larger models with a one-time upgrade.

**Highlights:** On-device AI inference, Offline conversations, Image analysis, Model catalog download, Customizable generation settings, Private by design

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Local Engine Pro | $2.99 | one-time |
| LocalEngine Pro | $4.99 | one-time |
| Professional | $9.99 | one-time |


## Frequently asked questions

### Is OThree AI free?

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

### Is LocalEngine free?

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

### Do OThree AI or LocalEngine have ads?

Neither OThree AI nor LocalEngine shows ads.

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

OThree AI ships an update every 9 days, and LocalEngine every 5 days. Most recently, OThree AI was updated on October 30, 2026 and LocalEngine 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.*