# metr.at vs SMART BMS

The clearest difference is review sentiment: metr.at at 88% against SMART BMS's 11%. metr.at also leads on rating (4.7 vs 2.1) and device support (4 vs 2). SMART BMS's advantage is ratings volume (76 vs 19). On price, update cadence, ads and in-app purchases there is nothing between them.

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

metr.at holds the better App Store score, 4.7 against 2.1. Both are backed by a comparable volume of ratings — 19 and 76 respectively. Written reviews point the same way: 88% of metr.at's written reviews are positive against 11% of SMART BMS's.

metr.at ships an update every 4 weeks, SMART BMS every 6 weeks. The most recent releases landed on July 4, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | metr.at | SMART BMS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (19 ratings)](https://appshunter.io/ios/app/metrat/id1165745913/reviews)** | [2.1 (76 ratings)](https://appshunter.io/ios/app/smart-bms/id1519968339/reviews) |
| Number of ratings | 19 | **76** |
| Positive reviews | **87.5% of reviews** | 11.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 6 weeks |
| Monetization | Free | Free |
| Size | 65 MB | 65 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Voyage Systems AB](https://appshunter.io/developer/1710124681) | [所兵 邱](https://appshunter.io/developer/1519230775) |

## 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


### SMART BMS

[App page](https://appshunter.io/ios/app/smart-bms/id1519968339)

Connect to and manage your lithium battery via Bluetooth. Monitor battery status, query information, and set safety parameters. Receive alerts for battery faults and track their occurrences.

**Highlights:** Bluetooth battery connection, Battery status query, Fault alarm monitoring, Safety parameter settings, Password protection for settings

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Functional app
- 👍 Easy to use
- 🔋 Works with lithium batteries
- 💡 Displays cell balance information

**What reviewers complain about**

- 🐛 Connection issues
- 🐛 Crashes and freezes
- 🐛 Unreliable data
- 🐛 Compatibility problems with updates
- 🔋 Drains phone battery

**Reported bugs**

- Bluetooth connectivity problems
- Incorrect series/parallel configuration display
- Firmware update issues
- Inconsistent data readings
- Inability to change settings

**Requested features**

- Dark mode option
- Logging and historical data
- Better parameter customization
- Improved battery monitoring metrics
- Apple Watch support


## Frequently asked questions

### Is metr.at free?

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

### Is SMART BMS free?

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

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

metr.at is rated higher. metr.at averages 4.7 out of 5 from 19 ratings, while SMART BMS averages 2.1 from 76 ratings.

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

Neither metr.at nor SMART BMS shows ads.

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

metr.at ships an update every 4 weeks, and SMART BMS every 6 weeks. Most recently, metr.at was updated on July 4, 2026 and SMART BMS on September 14, 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.*