# Catalyst vs HelixNotes

The clearest difference is update cadence: Catalyst at every 9 days against HelixNotes's every 3 weeks. HelixNotes's advantage is iOS requirement (14.0 vs 18.0). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Catalyst against 5.0 for HelixNotes. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

Catalyst ships an update every 9 days, HelixNotes every 3 weeks. The most recent releases landed on September 21, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Catalyst | HelixNotes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/catalyst-ai-workspace/id6787500410/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/helixnotes/id6788490726/reviews) |
| Number of ratings | 1 | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | Free | Free |
| Size | 31 MB | 18 MB |
| Requires iOS | 18.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [ObjectGraph LLC](https://appshunter.io/developer/284700705) | [Yuri Karamian](https://appshunter.io/developer/6788490728) |

## What reviewers say

### Catalyst

[App page](https://appshunter.io/ios/app/catalyst-ai-workspace/id6787500410)

Access multiple leading AI models in one app, compare their responses, and generate images or videos. It also supports Python code execution and web searches with sources. Bring your own API keys for flexibility and control over your data.

**Highlights:** Access multiple AI models, Compare AI model responses, Generate images and video clips, Secure Python sandbox, Web search with sources, Attach files and photos, Persistent conversation memory

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

**In-app purchases:** none


### HelixNotes

[App page](https://appshunter.io/ios/app/helixnotes/id6788490726)

A private, open-source Markdown note-taking app that keeps your data on your device. Organize notes with notebooks, tags, and wiki links, and utilize advanced features like mathematical notation and diagrams.

**Highlights:** Local Markdown storage, Visual and source code editor, Notebooks, tags, and wiki links, Task management and calendar views, KaTeX and Mermaid diagram support, Version history and backups, Optional WebDAV sync

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

**In-app purchases:** none


## Frequently asked questions

### Is Catalyst free?

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

### Is HelixNotes free?

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

### Which has better reviews, Catalyst or HelixNotes?

Catalyst and HelixNotes are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do Catalyst or HelixNotes have ads?

Neither Catalyst nor HelixNotes shows ads.

### Which is updated more often, Catalyst or HelixNotes?

Catalyst ships an update every 9 days, and HelixNotes every 3 weeks. Most recently, Catalyst was updated on September 21, 2026 and HelixNotes on September 18, 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.*