123SmartBMS vs Overkill Solar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
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.
- 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
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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
Verdict
123SmartBMS and Overkill Solar both sit at 4.5 stars, but that hides the real split: 100% of Overkill Solar's written reviews are positive against 67% of 123SmartBMS's. Overkill Solar also leads on iOS requirement (13.4 vs 16.0). 123SmartBMS's advantage is update cadence (monthly vs every 4 months). On price, rating, ratings volume and ads 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. Neither carries in-app purchases, so what you see is what you pay.
Overkill Solar holds the better App Store score, 4.7 against 4.5. Both are backed by a comparable volume of ratings — 21 and 16 respectively. Written reviews point the same way: 67% of 123SmartBMS's written reviews are positive against 100% of Overkill Solar's.
123SmartBMS ships an update monthly, Overkill Solar every 4 months. The most recent releases landed on September 20, 2026 and August 18, 2026 respectively.
| Parameter | 123SmartBMS | Overkill Solar |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (21 ratings) | 4.7 (16 ratings) — better |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 21 — better | 16 |
| Update frequency | Monthly — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 13.4 — better |
| Further details — not scored | ||
| Size | 190 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | Albertronic B.V. | Overkill Solar LLC |
Customer experience
123SmartBMS
Overkill Solar
In-app purchases
123SmartBMS
No in-app purchases
Overkill Solar
No in-app purchases
