# BM6 vs Keepfold

The clearest difference is in-app purchases: BM6 at none against Keepfold's 2. BM6 also leads on iOS requirement (15.6 vs 18.0). Keepfold's advantage is update cadence (daily vs every 5 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Keepfold sells 2 in-app purchases, starting at $7.99 per year. BM6 asks for nothing beyond the download.

BM6 ships an update every 5 weeks, Keepfold daily. Both last shipped on September 22, 2026.

## The numbers

| Metric | BM6 | Keepfold |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.2 (17 ratings)](https://appshunter.io/ios/app/bm6/id1561912036/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 45.8% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Daily** |
| Monetization | Free | — |
| Size | 64 MB | 2 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | **iPhone, iPod, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Leagend Optoelectronics Co., Ltd.](https://appshunter.io/developer/6798210621) | [AKE KRISTOFFER NILSSON](https://appshunter.io/developer/6798776923) |

## 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


### Keepfold

[App page](https://appshunter.io/ios/app/keepfold/id6810941176)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Keepfold Plus | $7.99 | per year |
| Keepfold Plus Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is BM6 free?

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

### Is Keepfold free?

Keepfold is free to download, with in-app purchases available.

### Do BM6 or Keepfold have ads?

Neither BM6 nor Keepfold shows ads.

### Which is updated more often, BM6 or Keepfold?

BM6 ships an update every 5 weeks, and Keepfold daily. Most recently, BM6 was updated on September 22, 2026 and Keepfold on September 22, 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.*