# BT Charger vs Sun Map Clock

The clearest difference is in-app purchases: BT Charger at none against Sun Map Clock's 2. BT Charger also leads on iOS requirement (9.2 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Sun Map Clock sells 2 in-app purchases, starting at $15.00 per month. BT Charger asks for nothing beyond the download.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on October 14, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | BT Charger | Sun Map Clock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Size | 40 MB | 74 MB |
| Requires iOS | **9.2** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [appunique](https://appshunter.io/developer/927378702) | [QAEE CONPUUTENG](https://appshunter.io/developer/1853582855) |

## What reviewers say

### BT Charger

[App page](https://appshunter.io/ios/app/bt-charger/id979809714)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sun Map Clock

[App page](https://appshunter.io/ios/app/sun-map-clock-shadow-tracker/id6765796926)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $15.00 | per month |
| Yearly Subscription | $150.00 | per year |


## Frequently asked questions

### Is BT Charger free?

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

### Is Sun Map Clock free?

Sun Map Clock is free to download, with in-app purchases available.

### Do BT Charger or Sun Map Clock have ads?

Neither BT Charger nor Sun Map Clock shows ads.

### Which is updated more often, BT Charger or Sun Map Clock?

BT Charger ships an update fortnightly, and Sun Map Clock fortnightly. Most recently, BT Charger was updated on October 14, 2026 and Sun Map Clock on October 24, 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.*