metr.at vs BMS Tool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
metr.at
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.
- 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
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Compatible with VESC®* Open Source Controller. • measure current, voltage, RPM, speed, etc • record and upload online • track route on google maps • view detailed and interactive chart • share the link with anyone • change speed modes (Slow, Normal, Fast, etc) • make videos with overlay Purchase Metr Pro Bluetooth module at Official shop https://voyagesystems.eu *VESC® is a registered Trademark owned by Benjamin Vedder. TM policies can be found here: http://www.vesc-project.com/trademark_policies
BMS Tool
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.
- 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
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BMS Tool shows the state of your battery from its battery management system (BMS) over Bluetooth, on the iPhone, the iPad, the Mac and the Apple Watch. Supported BMS: - JBD / XiaoXiang smart BMS, also in Liontron batteries - JK BMS (Jikong) - ANT BMS, the older boards and the newer ANT-BLE boards - Seplos V2 and V3 - Redodo, LiTime, PowerQueen and Starry Sea batteries - WattCycle batteries - Wattstunde LiFePO4 and Wattstunde Nova Core batteries - Ective, LiFeBlue, KiloVault, Enerdrive, Noovi and StartCraft batteries Features: - Charge, voltage, current and power at a glance - Time until full while charging and until empty while discharging, estimated from the present current - Every cell voltage with minimum, maximum, difference and balancing - Temperature sensors, alarms and BMS information - Several batteries in one list, each with its own name - Search for new devices can be switched off: only your own batteries stay in the list - Session values and a CSV log of the readings - Home screen widget - Apple Watch app with complications: charge, cells, temperatures and alarms of the battery open on the iPhone - The display can stay on while the app is open The app reads the values of the BMS and does not change its settings. Ideas and requests are welcome at web.e77code.com/bms-tool.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | metr.at | BMS Tool |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (19 ratings) — better | 3.9 (7 ratings) |
| Positive reviews | 87.5% of reviews — better | 71.4% of reviews |
| Number of ratings | 19 — better | 7 |
| Update frequency | Every 4 weeks — better | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Apple Watch | iPhone, iPad, iPod, Apple Watch |
| Requires iOS | 12.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 65 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Voyage Systems AB | e77code GmbH |
Customer experience
metr.at
BMS Tool
In-app purchases
metr.at
No in-app purchases
BMS Tool
- Remove Ads$3.99









