# Sideos Transponder vs Authnull Authenticator

The clearest difference is iOS requirement: Sideos Transponder at 13.0 against Authnull Authenticator's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Sideos Transponder | Authnull Authenticator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Size | 74 MB | 22 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [sideos GmbH](https://appshunter.io/developer/1611001160) | [Asif Ali](https://appshunter.io/developer/1684304119) |

## What reviewers say

### Sideos Transponder

[App page](https://appshunter.io/ios/app/sideos-transponder/id1611001158)

**Features:** macOS Compatibility

**In-app purchases:** none


### Authnull Authenticator

[App page](https://appshunter.io/ios/app/authnull-authenticator/id6450597014)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sideos Transponder free?

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

### Is Authnull Authenticator free?

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

### Do Sideos Transponder or Authnull Authenticator have ads?

Neither Sideos Transponder nor Authnull Authenticator shows ads.

### Which is updated more often, Sideos Transponder or Authnull Authenticator?

Sideos Transponder ships an update every 2 months, and Authnull Authenticator every 2 months. Most recently, Sideos Transponder was updated on October 27, 2026 and Authnull Authenticator on October 30, 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.*