# 123SmartBMS vs Overkill Solar

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.

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.

## The numbers

| Metric | 123SmartBMS | Overkill Solar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (21 ratings)](https://appshunter.io/ios/app/123smartbms/id988285264/reviews) | **[4.7 (16 ratings)](https://appshunter.io/ios/app/overkill-solar/id6444233824/reviews)** |
| Number of ratings | **21** | 16 |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 4 months |
| Monetization | Free | Free |
| Size | 190 MB | 21 MB |
| Requires iOS | 16.0 | **13.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Albertronic B.V.](https://appshunter.io/developer/890882604) | [Overkill Solar LLC](https://appshunter.io/developer/1653276724) |

## What reviewers say

### 123SmartBMS

[App page](https://appshunter.io/ios/app/123smartbms/id988285264)

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:** macOS Compatibility

**In-app purchases:** none


### Overkill Solar

[App page](https://appshunter.io/ios/app/overkill-solar/id6444233824)

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:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 123SmartBMS free?

123SmartBMS is free to download, with no in-app purchases.

### Is Overkill Solar free?

Overkill Solar is free to download, with no in-app purchases.

### Which has better reviews, 123SmartBMS or Overkill Solar?

Overkill Solar is rated higher. 123SmartBMS averages 4.5 out of 5 from 21 ratings, while Overkill Solar averages 4.7 from 16 ratings.

### Do 123SmartBMS or Overkill Solar have ads?

Neither 123SmartBMS nor Overkill Solar shows ads.

### Which is updated more often, 123SmartBMS or Overkill Solar?

123SmartBMS ships an update monthly, and Overkill Solar every 4 months. Most recently, 123SmartBMS was updated on September 20, 2026 and Overkill Solar on August 18, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*