BMS Tool vs Hy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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: - XiaoXiang smart BMS - ANT BMS - Liontron batteries - Wattstunde LiFePO4 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 - 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.
Hy
Monitor and control hybrid energy systems remotely. Access real-time data from PV and ESS systems via the internet and adjust parameters from anywhere.
- Remote data monitoring
- Real-time PV & ESS information
- Remote control capabilities
- Parameter settings
- Internet connectivity
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Hy-Power is a remote data APP that is compatible with PV & ESS hybrid energy systems. It allows users to pick up informations of the PV & ESS hybrid energy system in real-time through the Internet, or perform remote control and parameter settings.
Screenshots
Verdict
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.
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. 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.
| Parameter | BMS Tool | Hy |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (7 ratings) — better | 2.4 (5 ratings) |
| Positive reviews | 71.4% of reviews — better | 25.0% of reviews |
| Number of ratings | 7 — better | 5 |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 20 MB | 43 MB |
| Age rating | 4+ | 17+ |
| Developer | e77code GmbH | Jiangsu Hybrid Energy Technology Co., Ltd |
Customer experience
BMS Tool
Hy
In-app purchases
BMS Tool
- Remove Ads$1.99
Hy
No in-app purchases
