# Terma AR vs BT21

Terma AR and BT21 are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | Terma AR | BT21 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 10 months |
| Size | 507 MB | 23 MB |
| Requires iOS | **11.3** | 12.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Terma](https://appshunter.io/developer/1237660152) | [Thermogroup UK](https://appshunter.io/developer/915777303) |

## What reviewers say

### Terma AR

[App page](https://appshunter.io/ios/app/terma-ar/id1500121052)

**In-app purchases:** none


### BT21

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Terma AR free?

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

### Is BT21 free?

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

### Do Terma AR or BT21 have ads?

Neither Terma AR nor BT21 shows ads.

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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.*