Comparison

BMS Tool vs Overkill Solar

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

Overkill Solar

This app connects to a solar battery management system to provide detailed monitoring and control. Users can track cell voltage, capacity, current, and manage charging/discharging ports. It also offers advanced configuration options for calibration, balancing, and protection settings.

Highlights
  • Monitor cell voltage and capacity
  • Control charging and discharging ports
  • Calibrate voltage and current
  • Configure balancer and protection values
  • Log voltage, current, and power
  • Monitor BMS alarms and temperature
Features
Read full description

Overkill Solar iOS App allows users to connect with the Overkill Solar Battery Management System (BMS). It can monitor voltage of the cells, total capacity, charging and discharging current, and switch the charging and discharging ports on or off. Features: - change bluetooth advertising name - unlock hardware protected BMS - save or load BMS configurations - calibrate cells voltage and charging or discharging current - log maximum or minimum voltage, current and power - enable and configure the balancer - modify the capacity settings - monitor temperature - monitor BMS alarms - import and export .fig files - set level 2 and 3 advanced protection values

Screenshots

BMS Tool3 screens
Overkill Solar4 screens

Verdict

The call

The clearest difference is rating: Overkill Solar at 4.8 against BMS Tool's 3.9. Overkill Solar also leads on in-app purchases (none vs 1) and ads (none vs shown). BMS Tool's advantage is update cadence (every 2 months vs every 4 months). On price 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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

Overkill Solar holds the better App Store score, 4.8 against 3.9. Both are backed by a comparable volume of ratings — 7 and 21 respectively. Written reviews point the same way: 71% of BMS Tool's written reviews are positive against 100% of Overkill Solar's.

UpkeepUpdate frequency

BMS Tool ships an update every 2 months, Overkill Solar every 4 months. Both last shipped on November 3, 2026.

Scorecard8 real differences · 2 level
BMS Tool versus Overkill Solar: the parameters behind the verdict, then further details
ParameterBMS ToolOverkill Solar
PriceFreeFree
Rating3.9 (7 ratings)4.8 (21 ratings) — better
Positive reviews71.4% of reviews100.0% of reviews — better
Number of ratings721 — better
Update frequencyEvery 2 months — betterEvery 4 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, iPod
Requires iOS15.013.4 — better
Further details — not scored
Size20 MB21 MB
Age rating4+4+
Developere77code GmbHOverkill Solar LLC

Customer experience

BMS Tool

All ratings7 ratings
Positive71.4%
Neutral0.0%
Negative28.6%
Written reviews7 reviews
Positive71.4%
Neutral14.3%
Negative14.3%

Overkill Solar

All ratings16 ratings
Positive87.5%
Neutral12.5%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

BMS Tool

One-time1
  • Remove Ads$3.99
None

Overkill Solar

No in-app purchases

Questions

Is BMS Tool free?
BMS Tool is free to download, with in-app purchases available.
Is Overkill Solar free?
Overkill Solar is free to download, with no in-app purchases.
Which has better reviews, BMS Tool or Overkill Solar?
Overkill Solar is rated higher. BMS Tool averages 3.9 out of 5 from 7 ratings, while Overkill Solar averages 4.8 from 21 ratings.
Do BMS Tool or Overkill Solar have ads?
BMS Tool shows ads; Overkill Solar does not.
Which is updated more often, BMS Tool or Overkill Solar?
BMS Tool ships an update every 2 months, and Overkill Solar every 4 months. Most recently, BMS Tool was updated on November 3, 2026 and Overkill Solar on November 3, 2026.

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