# TdSE vs KBI CatApp

The clearest difference is update cadence: KBI CatApp at every 9 months against TdSE's every 24 months. On price, ads, in-app purchases and device support there is nothing between them.

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

TdSE ships an update every 24 months, KBI CatApp every 9 months. The most recent releases landed on October 19, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | TdSE | KBI CatApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/kbi-catapp/id6444090674/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 9 months** |
| Monetization | — | Free |
| Size | 80 MB | 54 MB |
| Requires iOS | **15.6** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [NC Lab](https://appshunter.io/developer/889870684) | [Kinsbursky Bros. Supply, Inc.](https://appshunter.io/developer/1472290520) |

## What reviewers say

### TdSE

[App page](https://appshunter.io/ios/app/tdse/id1483912060)

**Features:** macOS Compatibility

**In-app purchases:** none


### KBI CatApp

[App page](https://appshunter.io/ios/app/kbi-catapp/id6444090674)

Access a comprehensive database of catalytic converter prices, updated daily based on real-time market data and in-house laboratory analysis. Find accurate valuations for your converters.

**Highlights:** Extensive catalytic converter price list, Daily price updates, In-house laboratory analysis, XRF and ICP instrumentation data, Market-based pricing (platinum, palladium, rhodium)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is TdSE free?

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

### Is KBI CatApp free?

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

### Do TdSE or KBI CatApp have ads?

Neither TdSE nor KBI CatApp shows ads.

### Which is updated more often, TdSE or KBI CatApp?

TdSE ships an update every 24 months, and KBI CatApp every 9 months. Most recently, TdSE was updated on October 19, 2026 and KBI CatApp on October 24, 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.*