# Oplev HTK vs Allerød Bio

The clearest difference is update cadence: Oplev HTK at every 4 months against Allerød Bio's every 31 months. Oplev HTK also leads on iOS requirement (11.0 vs 15.1). 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.

Oplev HTK ships an update every 4 months, Allerød Bio every 31 months. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Oplev HTK | Allerød Bio |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 31 months |
| Size | 6 MB | 14 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hviid Digital](https://appshunter.io/developer/1639090824) | [ebillet a/s](https://appshunter.io/developer/504282633) |

## What reviewers say

### Oplev HTK

[App page](https://appshunter.io/ios/app/oplev-htk/id1460265984)

**Features:** macOS Compatibility

**In-app purchases:** none


### Allerød Bio

[App page](https://appshunter.io/ios/app/allerd-bio/id6478563271)

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

**In-app purchases:** none


## Frequently asked questions

### Is Oplev HTK free?

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

### Is Allerød Bio free?

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

### Do Oplev HTK or Allerød Bio have ads?

Neither Oplev HTK nor Allerød Bio shows ads.

### Which is updated more often, Oplev HTK or Allerød Bio?

Oplev HTK ships an update every 4 months, and Allerød Bio every 31 months. Most recently, Oplev HTK was updated on October 26, 2026 and Allerød Bio on October 27, 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.*