# Kai vs Rewrites Studio

Kai and Rewrites Studio are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Kai ships an update every 3 days, Rewrites Studio every 2 days. The most recent releases landed on September 10, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Kai | Rewrites Studio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/kai-ai/id6758148023/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 days | **Every 2 days** |
| Monetization | Free | — |
| Size | 127 MB | 56 MB |
| Requires iOS | 15.3 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Simon Schubert](https://appshunter.io/developer/1219649975) | [Rewrites Studio LLC](https://appshunter.io/developer/6783039468) |

## What reviewers say

### Kai

[App page](https://appshunter.io/ios/app/kai-ai/id6758148023)

This open-source AI companion offers fast, simple, and private chat experiences powered by models like Llama and Gemini. It's designed for quick answers, brainstorming, writing, and learning with a minimalist interface.

**Highlights:** Blazing fast AI responses, Minimalist and intuitive interface, Open-source and transparent code, Choice of AI models (Llama, Gemini), Context-aware multi-turn conversations, Privacy-focused, no user tracking

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

**In-app purchases:** none


### Rewrites Studio

[App page](https://appshunter.io/ios/app/rewrites-studio/id6783039466)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Kai free?

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

### Is Rewrites Studio free?

Rewrites Studio is free to download, with no in-app purchases.

### Do Kai or Rewrites Studio have ads?

Neither Kai nor Rewrites Studio shows ads.

### Which is updated more often, Kai or Rewrites Studio?

Kai ships an update every 3 days, and Rewrites Studio every 2 days. Most recently, Kai was updated on September 10, 2026 and Rewrites Studio on September 23, 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.*