Comparison

BMS Tool vs i

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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.

About

i

Features
Read full description

Control your Grandfar GEM Series smart circulation pumps anytime, anywhere! Grandfar GEM Remote – Your Smart Pumping Companion Take full command of your Grandfar GEM Series smart circulation pumps with this intuitive app. Designed for homeowners and professionals alike, the app empowers you to optimize water circulation systems effortlessly.

Screenshots

BMS Tool3 screens
i4 screens

Verdict

The call

The clearest difference is in-app purchases: i at none against BMS Tool's 1. i also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). BMS Tool's advantage is device support (4 vs 2). On price and update cadence 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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

BMS Tool ships an update every 2 months, i every 6 weeks. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

Scorecard4 real differences · 6 level
BMS Tool versus i: the parameters behind the verdict, then further details
ParameterBMS Tooli
PriceFreeFree
Rating3.9 (7 ratings) — better—
Positive reviews71.4% of reviews—
Number of ratings7 — better—
Update frequencyEvery 2 monthsEvery 6 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPod
Requires iOS15.013.0 — better
Further details — not scored
Size20 MB25 MB
Age rating4+4+
Developere77code GmbHGrandfar

In-app purchases

1 purchases

BMS Tool

One-time1
  • Remove Ads$3.99
None

i

No in-app purchases

Questions

Is BMS Tool free?
BMS Tool is free to download, with in-app purchases available.
Is i free?
i is free to download, with no in-app purchases.
Do BMS Tool or i have ads?
BMS Tool shows ads; i does not.
Which is updated more often, BMS Tool or i?
BMS Tool ships an update every 2 months, and i every 6 weeks. Most recently, BMS Tool was updated on October 29, 2026 and i on October 28, 2026.

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