# Secure Notes AI vs Catalyst

The clearest difference is update cadence: Secure Notes AI at every 3 days against Catalyst's every 9 days. Secure Notes AI also leads on iOS requirement (15.1 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 Secure Notes AI against 5.0 for Catalyst. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Secure Notes AI ships an update every 3 days, Catalyst every 9 days. The most recent releases landed on September 18, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Secure Notes AI | Catalyst |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/secure-notes-ai/id6759361671/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/catalyst-ai-workspace/id6787500410/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 9 days |
| Monetization | Free | Free |
| Size | 42 MB | 31 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [John Martins](https://appshunter.io/developer/1878296078) | [ObjectGraph LLC](https://appshunter.io/developer/284700705) |

## What reviewers say

### Secure Notes AI

[App page](https://appshunter.io/ios/app/secure-notes-ai/id6759361671)

Securely store and encrypt your notes with advanced on-device protection. Utilize built-in AI for summaries and insights without data leaving your phone. Enjoy offline access and precise search for all your information.

**Highlights:** Advanced on-device encryption, Built-in AI for summaries and insights, Precision search, Full offline support, Starred notes for quick access, No ads or tracking

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Secure Notes AI free?

Secure Notes AI is free to download, with no in-app purchases.

### Is Catalyst free?

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

### Which has better reviews, Secure Notes AI or Catalyst?

Secure Notes AI and Catalyst are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Secure Notes AI or Catalyst have ads?

Neither Secure Notes AI nor Catalyst shows ads.

### Which is updated more often, Secure Notes AI or Catalyst?

Secure Notes AI ships an update every 3 days, and Catalyst every 9 days. Most recently, Secure Notes AI was updated on September 18, 2026 and Catalyst on October 8, 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.*