# LEHMANN Transponder vs Key Programmer

The clearest difference is update cadence: Key Programmer at every 2 weeks against LEHMANN Transponder's every 10 months. Key Programmer also leads on iOS requirement (15.0 vs 18.6). 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.

LEHMANN Transponder ships an update every 10 months, Key Programmer every 2 weeks. The most recent releases landed on October 4, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | LEHMANN Transponder | Key Programmer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 weeks** |
| Size | 3 MB | 88 MB |
| Requires iOS | 18.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lehmann Vertriebsges. mbH & Co. KG](https://appshunter.io/developer/980603055) | [Shenzhen Ecartek Technology, Ltd.](https://appshunter.io/developer/994423482) |

## What reviewers say

### LEHMANN Transponder

[App page](https://appshunter.io/ios/app/lehmann-transponder/id1637886496)

**In-app purchases:** none


### Key Programmer

[App page](https://appshunter.io/ios/app/key-programmer/id6805297600)

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

**In-app purchases:** none


## Frequently asked questions

### Is LEHMANN Transponder free?

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

### Is Key Programmer free?

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

### Do LEHMANN Transponder or Key Programmer have ads?

Neither LEHMANN Transponder nor Key Programmer shows ads.

### Which is updated more often, LEHMANN Transponder or Key Programmer?

LEHMANN Transponder ships an update every 10 months, and Key Programmer every 2 weeks. Most recently, LEHMANN Transponder was updated on October 4, 2026 and Key Programmer on October 8, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*