# 极空BMS vs KL Serials

The clearest difference is rating: KL Serials at 4.5 against 极空BMS's 3.5. KL Serials also leads on device support (3 vs 1) and iOS requirement (9.0 vs 17). 极空BMS's advantage is update cadence (every 3 weeks vs every 3 months) and ratings volume (37 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

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

KL Serials holds the better App Store score, 4.5 against 3.5. That said, the two scores are not equally well evidenced: 极空BMS has 37 ratings behind it against 2, so its average is the more settled of the two.

极空BMS ships an update every 3 weeks, KL Serials every 3 months. The most recent releases landed on September 29, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | 极空BMS | KL Serials |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.5 (37 ratings)](https://appshunter.io/ios/app/bms/id1425725691/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/kl-serials/id1576480701/reviews)** |
| Number of ratings | **37** | 2 |
| Positive reviews | 34.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Monetization | Free | Free |
| Size | 36 MB | 29 MB |
| Requires iOS | 17 | **9.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [鹏 张](https://appshunter.io/developer/1425725690) | [Hangzhou Junce Instruments Co., Ltd.](https://appshunter.io/developer/1535583983) |

## What reviewers say

### 极空BMS

[App page](https://appshunter.io/ios/app/bms/id1425725691)

This application connects to a battery management system's active equalizer via Bluetooth. It allows for real-time monitoring of parameters and control over equipment settings.

**Highlights:** Real-time status monitoring, Operating parameter settings, Battery management system equipment control, Bluetooth connectivity

**Features:** macOS Compatibility

**In-app purchases:** none


### KL Serials

[App page](https://appshunter.io/ios/app/kl-serials/id1576480701)

This utility app measures various electrical parameters like voltage, current, and power. It also offers multiple protection functions, including over-voltage, over-current, and over-temperature alerts, while monitoring battery capacity in real-time.

**Highlights:** Measures voltage, current, power, and capacity, Monitors watt-hours and time, Over-voltage protection, Over-current protection, Over-temperature protection, Real-time battery capacity monitoring, Automatic current direction identification

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 极空BMS free?

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

### Is KL Serials free?

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

### Which has better reviews, 极空BMS or KL Serials?

KL Serials is rated higher. 极空BMS averages 3.5 out of 5 from 37 ratings, while KL Serials averages 4.5 from 2 ratings.

### Do 极空BMS or KL Serials have ads?

Neither 极空BMS nor KL Serials shows ads.

### Which is updated more often, 极空BMS or KL Serials?

极空BMS ships an update every 3 weeks, and KL Serials every 3 months. Most recently, 极空BMS was updated on September 29, 2026 and KL Serials on September 21, 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.*