# Transponder SMS vs KLAR

The clearest difference is in-app purchases: Transponder SMS at none against KLAR's 2. Transponder SMS also leads on update cadence (every 2 weeks vs every 5 weeks) and iOS requirement (10.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. KLAR sells 2 in-app purchases, starting at $11.99 per month. Transponder SMS asks for nothing beyond the download.

Transponder SMS ships an update every 2 weeks, KLAR every 5 weeks. The most recent releases landed on October 24, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Transponder SMS | KLAR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/transponder-sms/id1235180276/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 5 weeks |
| Monetization | Free | — |
| Size | 42 MB | 39 MB |
| Requires iOS | **10.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Transponder AS](https://appshunter.io/developer/926724247) | [Klar Kompetanse AS](https://appshunter.io/developer/1523018241) |

## What reviewers say

### Transponder SMS

[App page](https://appshunter.io/ios/app/transponder-sms/id1235180276)

A digital message box for parents of children attending schools and kindergartens using the Transponder SMS system. It offers secure messaging with delivery reports and the ability to attach files, providing a more organized communication channel than traditional SMS.

**Highlights:** Absence reporting forms, File attachments, Unified inbox for multiple schools, Automatic delivery reports, Message recipient tracking, Electronic form completion, Secure message transport

**Features:** macOS Compatibility

**In-app purchases:** none


### KLAR

[App page](https://appshunter.io/ios/app/klar/id1523018239)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $11.99 | per month |
| Yearly subscription | $149.99 | per year |


## Frequently asked questions

### Is Transponder SMS free?

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

### Is KLAR free?

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

### Do Transponder SMS or KLAR have ads?

Neither Transponder SMS nor KLAR shows ads.

### Which is updated more often, Transponder SMS or KLAR?

Transponder SMS ships an update every 2 weeks, and KLAR every 5 weeks. Most recently, Transponder SMS was updated on October 24, 2026 and KLAR on October 4, 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.*