# Catalopedia vs TransMaS

The clearest difference is in-app purchases: TransMaS at none against Catalopedia's 5. Catalopedia's advantage is iOS requirement (13.0 vs 16.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Catalopedia sells 5 one-off in-app purchases. TransMaS asks for nothing beyond the download.

Catalopedia ships an update every 3 weeks, TransMaS every 10 days. The most recent releases landed on October 15, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Catalopedia | TransMaS |
| --- | --- | --- |
| 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 | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Monetization | Free with in-app purchases | — |
| Size | 61 MB | 68 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Skrya Pte Ltd](https://appshunter.io/developer/1607060618) | [TMS Online Ltd](https://appshunter.io/developer/1532920510) |

## 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 |


### TransMaS

[App page](https://appshunter.io/ios/app/transmas/id6462794547)

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

**In-app purchases:** none


## Frequently asked questions

### Is Catalopedia free?

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

### Is TransMaS free?

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

### Do Catalopedia or TransMaS have ads?

Neither Catalopedia nor TransMaS shows ads.

### Which is updated more often, Catalopedia or TransMaS?

Catalopedia ships an update every 3 weeks, and TransMaS every 10 days. Most recently, Catalopedia was updated on October 15, 2026 and TransMaS on October 9, 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.*