# Notify IM vs BioSync

The clearest difference is update cadence: BioSync at every 3 days against Notify IM's monthly. BioSync also leads on iOS requirement (15.1 vs 18.0). 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.

Notify IM ships an update monthly, BioSync every 3 days. The most recent releases landed on October 9, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Notify IM | BioSync |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Size | 50 MB | 53 MB |
| Requires iOS | 18.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Notify Technology](https://appshunter.io/developer/1338812994) | [Zebra B Ltd](https://appshunter.io/developer/1637889369) |

## What reviewers say

### Notify IM

[App page](https://appshunter.io/ios/app/notify-im/id1466921736)

**In-app purchases:** none


### BioSync

[App page](https://appshunter.io/ios/app/biosync-biogen/id6772211767)

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

**In-app purchases:** none


## Frequently asked questions

### Is Notify IM free?

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

### Is BioSync free?

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

### Do Notify IM or BioSync have ads?

Neither Notify IM nor BioSync shows ads.

### Which is updated more often, Notify IM or BioSync?

Notify IM ships an update monthly, and BioSync every 3 days. Most recently, Notify IM was updated on October 9, 2026 and BioSync on October 13, 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.*