# metr.at vs BMS Tool

The clearest difference is rating: metr.at at 4.7 against BMS Tool's 3.9. metr.at also leads on in-app purchases (none vs 1) and ads (none vs shown). On price, ratings volume, update cadence and device support there is nothing between them.

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

metr.at holds the better App Store score, 4.7 against 3.9. Both are backed by a comparable volume of ratings — 19 and 7 respectively. Written reviews point the same way: 88% of metr.at's written reviews are positive against 71% of BMS Tool's.

metr.at ships an update every 4 weeks, BMS Tool every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | metr.at | BMS Tool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (19 ratings)](https://appshunter.io/ios/app/metrat/id1165745913/reviews)** | [3.9 (7 ratings)](https://appshunter.io/ios/app/bms-tool/id1511343379/reviews) |
| Number of ratings | **19** | 7 |
| Positive reviews | **87.5% of reviews** | 71.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 65 MB | 20 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod, Apple Watch | iPhone, iPad, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Voyage Systems AB](https://appshunter.io/developer/1710124681) | [e77code GmbH](https://appshunter.io/developer/1375405425) |

## What reviewers say

### metr.at

[App page](https://appshunter.io/ios/app/metrat/id1165745913)

This app measures and records electrical data like current, voltage, and RPM for compatible devices. It allows users to track routes on Google Maps, view detailed charts, and create videos with data overlays. Users can also share their recorded data and adjust speed modes.

**Highlights:** Measure current, voltage, RPM, speed, Record and upload data online, Track route on Google Maps, View detailed interactive charts, Share data links, Change speed modes, Create videos with data overlay

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 | $3.99 | one-time |


## Frequently asked questions

### Is metr.at free?

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

### Is BMS Tool free?

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

### Which has better reviews, metr.at or BMS Tool?

metr.at is rated higher. metr.at averages 4.7 out of 5 from 19 ratings, while BMS Tool averages 3.9 from 7 ratings.

### Do metr.at or BMS Tool have ads?

BMS Tool shows ads; metr.at does not.

### Which is updated more often, metr.at or BMS Tool?

metr.at ships an update every 4 weeks, and BMS Tool every 2 months. Most recently, metr.at was updated on November 2, 2026 and BMS Tool on November 3, 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.*