# Catalytic Converter Database vs Converters Unlimited

The clearest difference is in-app purchases: Converters Unlimited at none against Catalytic Converter Database's 2. Catalytic Converter Database's advantage is update cadence (every 2 months vs every 17 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Catalytic Converter Database sells 2 in-app purchases, starting at $24.99 per month. Converters Unlimited asks for nothing beyond the download.

Catalytic Converter Database ships an update every 2 months, Converters Unlimited every 17 months. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Catalytic Converter Database | Converters Unlimited |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (20 ratings)](https://appshunter.io/ios/app/catalytic-converter-database/id1534897941/reviews)** | — |
| Number of ratings | **20** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 17 months |
| Monetization | Free with in-app purchases | — |
| Size | 24 MB | 40 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CONVERTERDATABASE LLC](https://appshunter.io/developer/1534897943) | [Converters Unlimited, Inc](https://appshunter.io/developer/1710979912) |

## What reviewers say

### Catalytic Converter Database

[App page](https://appshunter.io/ios/app/catalytic-converter-database/id1534897941)

Access a comprehensive database of catalytic converters with real-time pricing based on XRF values. Browse by manufacturer or code, view high-quality images, and stay updated with daily additions and market rate changes.

**Highlights:** Real-time pricing updated every 15 minutes, Daily additions of new converters, Advanced search by serial number or code, Browse by manufacturer and category, Multiple high-quality product images, Smooth animated image carousels

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Converter Database Monthly | $24.99 | per month |
| Converter Database Yearly | $249.99 | per year |


### Converters Unlimited

[App page](https://appshunter.io/ios/app/converters-unlimited/id6468937921)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Catalytic Converter Database free?

Catalytic Converter Database is free to download, with in-app purchases available.

### Is Converters Unlimited free?

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

### Do Catalytic Converter Database or Converters Unlimited have ads?

Neither Catalytic Converter Database nor Converters Unlimited shows ads.

### Which is updated more often, Catalytic Converter Database or Converters Unlimited?

Catalytic Converter Database ships an update every 2 months, and Converters Unlimited every 17 months. Most recently, Catalytic Converter Database was updated on October 27, 2026 and Converters Unlimited on October 25, 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.*