# SMART BMS vs KL Serials

The clearest difference is rating: KL Serials at 4.5 against SMART BMS's 2.1. KL Serials also leads on iOS requirement (9.0 vs 11.0). SMART BMS's advantage is ratings volume (76 vs 2) and update cadence (every 6 weeks vs every 3 months). 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 2.1. That said, the two scores are not equally well evidenced: SMART BMS has 76 ratings behind it against 2, so its average is the more settled of the two.

SMART BMS ships an update every 6 weeks, KL Serials every 3 months. The most recent releases landed on September 14, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | SMART BMS | KL Serials |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.1 (76 ratings)](https://appshunter.io/ios/app/smart-bms/id1519968339/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/kl-serials/id1576480701/reviews)** |
| Number of ratings | **76** | 2 |
| Positive reviews | 11.1% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 3 months |
| Monetization | Free | Free |
| Size | 65 MB | 29 MB |
| Requires iOS | 11.0 | **9.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [所兵 邱](https://appshunter.io/developer/1519230775) | [Hangzhou Junce Instruments Co., Ltd.](https://appshunter.io/developer/1535583983) |

## What reviewers say

### SMART BMS

[App page](https://appshunter.io/ios/app/smart-bms/id1519968339)

Connect to and manage your lithium battery via Bluetooth. Monitor battery status, query information, and set safety parameters. Receive alerts for battery faults and track their occurrences.

**Highlights:** Bluetooth battery connection, Battery status query, Fault alarm monitoring, Safety parameter settings, Password protection for settings

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Functional app
- 👍 Easy to use
- 🔋 Works with lithium batteries
- 💡 Displays cell balance information

**What reviewers complain about**

- 🐛 Connection issues
- 🐛 Crashes and freezes
- 🐛 Unreliable data
- 🐛 Compatibility problems with updates
- 🔋 Drains phone battery

**Reported bugs**

- Bluetooth connectivity problems
- Incorrect series/parallel configuration display
- Firmware update issues
- Inconsistent data readings
- Inability to change settings

**Requested features**

- Dark mode option
- Logging and historical data
- Better parameter customization
- Improved battery monitoring metrics
- Apple Watch support


### 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 SMART BMS free?

SMART 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, SMART BMS or KL Serials?

KL Serials is rated higher. SMART BMS averages 2.1 out of 5 from 76 ratings, while KL Serials averages 4.5 from 2 ratings.

### Do SMART BMS or KL Serials have ads?

Neither SMART BMS nor KL Serials shows ads.

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

SMART BMS ships an update every 6 weeks, and KL Serials every 3 months. Most recently, SMART BMS was updated on September 14, 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.*