# BT21 vs Co.din

The clearest difference is update cadence: Co.din at every 3 weeks against BT21's every 10 months. 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.

BT21 ships an update every 10 months, Co.din every 3 weeks. The most recent releases landed on September 29, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | BT21 | Co.din |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 weeks** |
| Size | 23 MB | 186 MB |
| Requires iOS | **12.4** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Thermogroup UK](https://appshunter.io/developer/915777303) | [NI PHARM TECH LIMITED](https://appshunter.io/developer/1878081177) |

## What reviewers say

### BT21

[App page](https://appshunter.io/ios/app/bt21/id1561931603)

**Features:** macOS Compatibility

**In-app purchases:** none


### Co.din

[App page](https://appshunter.io/ios/app/codin/id6759319321)

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

**In-app purchases:** none


## Frequently asked questions

### Is BT21 free?

BT21 is free to download, with no in-app purchases.

### Is Co.din free?

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

### Do BT21 or Co.din have ads?

Neither BT21 nor Co.din shows ads.

### Which is updated more often, BT21 or Co.din?

BT21 ships an update every 10 months, and Co.din every 3 weeks. Most recently, BT21 was updated on September 29, 2026 and Co.din on September 18, 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.*