# ISD Link vs TATTU

The clearest difference is rating: ISD Link at 2.1 against TATTU's 1.0. ISD Link also leads on review sentiment (21% vs 0%) and ratings volume (23 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

ISD Link holds the better App Store score, 2.1 against 1.0. That said, the two scores are not equally well evidenced: ISD Link has 23 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 21% of ISD Link's written reviews are positive against 0% of TATTU's.

ISD Link ships an update every 3 weeks, TATTU every 2 months. The most recent releases landed on October 20, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | ISD Link | TATTU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.1 (23 ratings)](https://appshunter.io/ios/app/isd-link/id1568620244/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/tattu/id6476337515/reviews) |
| Number of ratings | **23** | 1 |
| Positive reviews | **21.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 61 MB | 4 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [深圳艾斯特创新科技有限公司](https://appshunter.io/developer/1405370693) | [Shenzhen Grepow Battery Co.Ltd.](https://appshunter.io/developer/1714028930) |

## What reviewers say

### ISD Link

[App page](https://appshunter.io/ios/app/isd-link/id1568620244)

This app allows interaction with various smart devices. It prioritizes user privacy by saving all data locally and not collecting personal information. Bluetooth is required for device scanning and connection.

**Highlights:** Smart device interaction, Local data saving, No account registration, Bluetooth connectivity, Supports numerous device models

**Features:** macOS Compatibility

**In-app purchases:** none


### TATTU

[App page](https://appshunter.io/ios/app/tattu/id6476337515)

This utility app provides battery management system (BMS) functions for smart batteries. It allows users to monitor and control battery parameters. Designed for efficient battery operation and maintenance.

**Highlights:** Battery Management System (BMS), Smart battery monitoring, Battery parameter control, Efficient battery operation, Battery maintenance functions

**In-app purchases:** none


## Frequently asked questions

### Is ISD Link free?

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

### Is TATTU free?

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

### Which has better reviews, ISD Link or TATTU?

ISD Link is rated higher. ISD Link averages 2.1 out of 5 from 23 ratings, while TATTU averages 1.0 from 1 ratings.

### Do ISD Link or TATTU have ads?

Neither ISD Link nor TATTU shows ads.

### Which is updated more often, ISD Link or TATTU?

ISD Link ships an update every 3 weeks, and TATTU every 2 months. Most recently, ISD Link was updated on October 20, 2026 and TATTU on October 7, 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.*