# Roamer BMS vs MAP BMS

The clearest difference is update cadence: Roamer BMS at every 2 weeks against MAP BMS's every 13 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Roamer BMS ships an update every 2 weeks, MAP BMS every 13 months. The most recent releases landed on September 30, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Roamer BMS | MAP BMS |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 13 months |
| Monetization | Free | — |
| Size | 5 MB | 48 MB |
| Requires iOS | 11.0 | 11.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [步泽 王](https://appshunter.io/developer/1517358781) | [Haidi Energy Tehcnogy Co., Ltd](https://appshunter.io/developer/1645467042) |

## What reviewers say

### Roamer BMS

[App page](https://appshunter.io/ios/app/roamer-bms/id1606195768)

Monitor your LiFePO4 batteries wirelessly from your iPhone. View real-time state of charge, voltage, current, and internal cell voltages. Compatible only with second-generation Roamer Batteries Smart BMS.

**Highlights:** Wireless Bluetooth connection, Real-time battery monitoring, State of charge display, Voltage and current readings, Internal cell voltage display, BMS parameter adjustment (admin)

**Features:** macOS Compatibility

**In-app purchases:** none


### MAP BMS

[App page](https://appshunter.io/ios/app/map-bms/id6443525563)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Roamer BMS free?

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

### Is MAP BMS free?

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

### Do Roamer BMS or MAP BMS have ads?

Neither Roamer BMS nor MAP BMS shows ads.

### Which is updated more often, Roamer BMS or MAP BMS?

Roamer BMS ships an update every 2 weeks, and MAP BMS every 13 months. Most recently, Roamer BMS was updated on September 30, 2026 and MAP BMS on October 4, 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.*