# Carbon Notes vs OpenWebUI

The clearest difference is price: Carbon Notes at Free against OpenWebUI's $2.99. OpenWebUI's advantage is in-app purchases (none vs 2) and update cadence (every 6 days vs every 3 weeks). On ads, device support and iOS requirement there is nothing between them.

Carbon Notes is free to download; OpenWebUI costs $2.99 up front. Carbon Notes sells 2 in-app purchases, starting at $19.99 per month. OpenWebUI asks for nothing beyond the download.

Carbon Notes ships an update every 3 weeks, OpenWebUI every 6 days. The most recent releases landed on September 10, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | Carbon Notes | OpenWebUI |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[4.0 (2 ratings)](https://appshunter.io/ios/app/openwebui-mobile/id6783872393/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | — | Paid |
| Size | 12 MB | 11 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YMMV](https://appshunter.io/developer/1224453829) | [Joao Victor Zao](https://appshunter.io/developer/6783872395) |

## What reviewers say

### Carbon Notes

[App page](https://appshunter.io/ios/app/carbon-notes/id6748026908)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro | $19.99 | per month |
| AI Unlock | $4.99 | one-time |


### OpenWebUI

[App page](https://appshunter.io/ios/app/openwebui-mobile/id6783872393)

This client app connects to your personal Open WebUI server for AI model interaction. Enjoy real-time chat, image generation, and voice commands, all while keeping your data private on your own server. Customize themes and manage chats with various actions.

**Highlights:** Real-time AI chat responses, Multiple AI model support, Image generation, Voice mode for interaction, Notes and knowledge base (RAG), Chat management and export, Customizable themes

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

**In-app purchases:** none


## Frequently asked questions

### Is Carbon Notes free?

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

### Is OpenWebUI free?

OpenWebUI costs $2.99, with no in-app purchases.

### Do Carbon Notes or OpenWebUI have ads?

Neither Carbon Notes nor OpenWebUI shows ads.

### Which is updated more often, Carbon Notes or OpenWebUI?

Carbon Notes ships an update every 3 weeks, and OpenWebUI every 6 days. Most recently, Carbon Notes was updated on September 10, 2026 and OpenWebUI on September 16, 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.*