# TK Smart Battery vs SoloEcho

The clearest difference is in-app purchases: TK Smart Battery at none against SoloEcho's 1. TK Smart Battery also leads on iOS requirement (9.0 vs 18.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. SoloEcho sells 1 one-off in-app purchase. TK Smart Battery asks for nothing beyond the download.

TK Smart Battery ships an update every 6 weeks, SoloEcho every 5 weeks. The most recent releases landed on October 4, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | TK Smart Battery | SoloEcho |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 5 weeks** |
| Size | 30 MB | 5 MB |
| Requires iOS | **9.0** | 18.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [应刚 郑](https://appshunter.io/developer/1446858821) | [恒俭 董](https://appshunter.io/developer/947356968) |

## What reviewers say

### TK Smart Battery

[App page](https://appshunter.io/ios/app/tk-smart-battery/id1562610645)

**Features:** macOS Compatibility

**In-app purchases:** none


### SoloEcho

[App page](https://appshunter.io/ios/app/soloecho/id6760158629)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Lifetime | $1.99 | one-time |


## Frequently asked questions

### Is TK Smart Battery free?

TK Smart Battery is free to download, with no in-app purchases.

### Is SoloEcho free?

SoloEcho is free to download, with in-app purchases available.

### Do TK Smart Battery or SoloEcho have ads?

Neither TK Smart Battery nor SoloEcho shows ads.

### Which is updated more often, TK Smart Battery or SoloEcho?

TK Smart Battery ships an update every 6 weeks, and SoloEcho every 5 weeks. Most recently, TK Smart Battery was updated on October 4, 2026 and SoloEcho on October 5, 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.*