# BM6 vs Solar Guardian

The clearest difference is rating: BM6 at 3.3 against Solar Guardian's 2.3. BM6 also leads on review sentiment (46% vs 17%). Solar Guardian's advantage is iOS requirement (13.0 vs 15.6). On price, ratings volume, update cadence 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.

BM6 holds the better App Store score, 3.3 against 2.3. Both are backed by a comparable volume of ratings — 18 and 17 respectively. Written reviews point the same way: 46% of BM6's written reviews are positive against 17% of Solar Guardian's.

BM6 ships an update every 5 weeks, Solar Guardian every 2 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | BM6 | Solar Guardian |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (18 ratings)](https://appshunter.io/ios/app/bm6/id1561912036/reviews)** | [2.3 (17 ratings)](https://appshunter.io/ios/app/solar-guardian/id6443552259/reviews) |
| Number of ratings | **18** | 17 |
| Positive reviews | **45.8% of reviews** | 16.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 64 MB | 85 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Leagend Optoelectronics Co., Ltd.](https://appshunter.io/developer/6798210621) | [BEIJING EPSOLAR TECHNOLOGY CO., LTD.](https://appshunter.io/developer/1330876646) |

## What reviewers say

### BM6

[App page](https://appshunter.io/ios/app/bm6/id1561912036)

Monitor your car's battery in real-time via Bluetooth. This app tests starting and charging systems, records engine start/stop times, and displays all data on your mobile device for easy management of your vehicle's battery power.

**Highlights:** Real-time battery voltage monitoring, Starting system voltage test, Charging system voltage test, Records engine start/stop times, Bluetooth data display, Vehicle battery power management

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


### Solar Guardian

[App page](https://appshunter.io/ios/app/solar-guardian/id6443552259)

Monitor and configure various solar energy systems, including inverters and storage solutions. This utility app provides essential data display and parameter adjustments for efficient energy management.

**Highlights:** Data display for solar systems, Parameter setting for inverters, Supports grid-tie and hybrid inverters, Manages energy storage systems, Configures N+1 hybrid systems, Monitors home and mobile energy storage

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is BM6 free?

BM6 is free to download, with no in-app purchases.

### Is Solar Guardian free?

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

### Which has better reviews, BM6 or Solar Guardian?

BM6 is rated higher. BM6 averages 3.3 out of 5 from 18 ratings, while Solar Guardian averages 2.3 from 17 ratings.

### Do BM6 or Solar Guardian have ads?

Neither BM6 nor Solar Guardian shows ads.

### Which is updated more often, BM6 or Solar Guardian?

BM6 ships an update every 5 weeks, and Solar Guardian every 2 months. Most recently, BM6 was updated on November 3, 2026 and Solar Guardian on November 3, 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.*