Comparison

123SmartBMS vs KH

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

Head to head
About

123SmartBMS

This app monitors and manages lithium battery packs, ensuring optimal condition and extended lifespan. It tracks cell voltages, temperatures, and currents, while balancing cells during charging. Connect via Bluetooth to view real-time battery status and control charging/discharging.

Highlights
  • Monitors cell voltages and temperatures
  • Tracks in- and outgoing currents
  • Balances cells during charging
  • Bluetooth connectivity for real-time data
  • Controls charge/discharge signals
  • Extends battery pack lifespan
Features
Read full description

123\SmartBMS is an easy to use yet advanced, modular BMS to keep your lithium batteries in perfect condition, increasing the lifespan of the battery pack. The system measures important data like cell voltages, cell temperatures and in- and outgoing currents. It also balances all cells to the same voltage during charging. The BMS supervises the whole battery pack and has two signal relays to indicate “allow to charge” and “allow to discharge”. These signal relays can control chargers and inverters with “enable”/”disable” signals or by connecting an energy efficient power relay to the signal relay. An example is the 123\SmartRelay. Easily connect your phone to the BMS using Bluetooth to see relevant information including state of charge, energy consumed, energy stored, in- and outgoing current, cell voltages and temperatures. With 123\SmartBMS, your battery pack is in safe hands.

About

KH

This utility measures electrical parameters like voltage, current, and power. It offers real-time monitoring of battery capacity and includes advanced protection functions. The app also supports data export and remote control via a mobile app or host computer.

Highlights
  • Measures voltage, current, power, and capacity
  • Real-time battery monitoring
  • Over-voltage, under-voltage, and over-current protection
  • Voltage and current curve display
  • Data export function
  • Mobile app and host computer control
  • Real-time firmware updates
Features
Read full description

The VAG series volt-ampere meter is a new type of coulomb counter that can measure various physical parameters such as voltage, current, power, charge and discharge capacity, watt-hours, time, etc. It can also set parameters to realize multiple protection functions such as over voltage protection, under voltage protection, over current protection, overpower protection, over temperature protection and time limit protection.The meter can automatically identify the direction of the current, and can monitor the battery capacity in real time and display the measured data in use color LCD screen. The VAG series voltage and current meters add voltage and current curve display and export functions on the basis of the original functions. At the same time, the mobile phone APP and host computer can be used to control, and the firmware can also be updated and upgraded in real time.

Screenshots

123SmartBMS4 screens
KH4 screens

Verdict

The call

The clearest difference is review sentiment: 123SmartBMS at 67% against KH's 0%. KH's advantage is update cadence (every 5 days vs monthly) and iOS requirement (9.0 vs 16.0). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

123SmartBMS ships an update monthly, KH every 5 days. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

Scorecard3 real differences · 7 level
123SmartBMS versus KH: the parameters behind the verdict, then further details
Parameter123SmartBMSKH
PriceFreeFree
Rating4.5 (21 ratings) — better—
Positive reviews66.7% of reviews — better0.0% of reviews
Number of ratings21 — better—
Update frequencyMonthlyEvery 5 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.09.0 — better
Further details — not scored
Size190 MB32 MB
Age rating4+4+
DeveloperAlbertronic B.V.Hangzhou Junce Instruments Co., Ltd.

Customer experience

123SmartBMS

All ratings21 ratings
Positive85.7%
Neutral4.8%
Negative9.5%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

KH

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

123SmartBMS

No in-app purchases

None

KH

No in-app purchases

Questions

Is 123SmartBMS free?
123SmartBMS is free to download, with no in-app purchases.
Is KH free?
KH is free to download, with no in-app purchases.
Do 123SmartBMS or KH have ads?
Neither 123SmartBMS nor KH shows ads.
Which is updated more often, 123SmartBMS or KH?
123SmartBMS ships an update monthly, and KH every 5 days. Most recently, 123SmartBMS was updated on October 24, 2026 and KH on October 9, 2026.

Other comparisons