# Catalopedia vs AI Notes

The clearest difference is update cadence: Catalopedia at every 3 weeks against AI Notes's every 7 months. Catalopedia also leads on device support and iOS requirement (13.0 vs 16.6). On price and in-app purchases there is nothing between them.

Both are free to download. Catalopedia sells 5 one-off in-app purchases and AI Notes sells 3 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Catalopedia ships an update every 3 weeks, AI Notes every 7 months. The most recent releases landed on October 15, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Catalopedia | AI Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/catalopedia/id1662071607/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | — |
| Update frequency | **Every 3 weeks** | Every 7 months |
| Monetization | Free with in-app purchases | — |
| Size | 61 MB | 61 MB |
| Requires iOS | **13.0** | 16.6 |
| Devices | **iPhone, iPod** | — |
| Age rating | 4+ | 4+ |
| Developer | [Skrya Pte Ltd](https://appshunter.io/developer/1607060618) | [Appvestor ApS](https://appshunter.io/developer/1761564418) |

## What reviewers say

### Catalopedia

[App page](https://appshunter.io/ios/app/catalopedia/id1662071607)

This app serves as a comprehensive encyclopedia for catalytic converters, offering free, unlimited searches. It provides transparent pricing, accurate metal and FX updates, and detailed 3D rendered images with exact measurements. The app also features an AI-powered identification tool and welcomes collaboration for expanding its product catalog.

**Highlights:** Unlimited free catalytic converter searches, Transparent pricing with customizable rates, Hourly updated metal and FX prices, 3D rendered images with exact measurements, AI-powered converter identification (Beta), Country-specific product differentiation, Collaborative expansion of product catalog

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 30 Credits | $29.99 | one-time |
| 66 Credits | $59.99 | one-time |
| 144 Credits | $99.99 | one-time |
| 225 Credits | $179.99 | one-time |
| 360 Credits | $229.99 | one-time |


### AI Notes

[App page](https://appshunter.io/ios/app/ai-notes-the-smart-notepad/id6752120327)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AI Notes Premium | $4.99 | per 7 days |
| AI Notes Premium | $14.99 | per month |
| AI Notes Lifetime | $89.99 | one-time |


## Frequently asked questions

### Is Catalopedia free?

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

### Is AI Notes free?

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

### Which is updated more often, Catalopedia or AI Notes?

Catalopedia ships an update every 3 weeks, and AI Notes every 7 months. Most recently, Catalopedia was updated on October 15, 2026 and AI Notes on October 12, 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.*