# BMS Tool vs Hy

The clearest difference is review sentiment: BMS Tool at 71% against Hy's 25%. BMS Tool also leads on rating (3.9 vs 2.4) and update cadence (every 2 months vs every 3 months). Hy's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, ratings volume and device support there is nothing between them.

Both are free to download. BMS Tool sells 1 one-off in-app purchase. Hy asks for nothing beyond the download.

BMS Tool holds the better App Store score, 3.9 against 2.4. Both are backed by a comparable volume of ratings — 7 and 5 respectively. Written reviews point the same way: 71% of BMS Tool's written reviews are positive against 25% of Hy's.

BMS Tool ships an update every 2 months, Hy every 3 months. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | BMS Tool | Hy |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (7 ratings)](https://appshunter.io/ios/app/bms-tool/id1511343379/reviews)** | [2.4 (5 ratings)](https://appshunter.io/ios/app/hy-power/id6447756193/reviews) |
| Number of ratings | **7** | 5 |
| Positive reviews | **71.4% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 20 MB | 43 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [e77code GmbH](https://appshunter.io/developer/1375405425) | [Jiangsu Hybrid Energy Technology Co., Ltd](https://appshunter.io/developer/1653244701) |

## What reviewers say

### BMS Tool

[App page](https://appshunter.io/ios/app/bms-tool/id1511343379)

Monitor your battery management systems via Bluetooth. Supports multiple BMS types including Liontron, XiaoXiang, ANT, and Wattstunde. Offers a screen always-on mode and macOS compatibility.

**Highlights:** Screen Always ON mode, Multiple BMS support, Liontron BMS read-only, XiaoXiang BMS read-only, ANT BMS read-only, Wattstunde LiFePo4 read-only, macOS support

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### Hy

[App page](https://appshunter.io/ios/app/hy-power/id6447756193)

Monitor and control hybrid energy systems remotely. Access real-time data from PV and ESS systems via the internet and adjust parameters from anywhere.

**Highlights:** Remote data monitoring, Real-time PV & ESS information, Remote control capabilities, Parameter settings, Internet connectivity

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BMS Tool free?

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

### Is Hy free?

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

### Which has better reviews, BMS Tool or Hy?

BMS Tool is rated higher. BMS Tool averages 3.9 out of 5 from 7 ratings, while Hy averages 2.4 from 5 ratings.

### Do BMS Tool or Hy have ads?

BMS Tool shows ads; Hy does not.

### Which is updated more often, BMS Tool or Hy?

BMS Tool ships an update every 2 months, and Hy every 3 months. Most recently, BMS Tool was updated on October 25, 2026 and Hy 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.*