# KL Serials vs KL500A

The clearest difference is update cadence: KL500A at every 4 weeks against KL Serials's every 3 months. KL Serials's advantage is iOS requirement (9.0 vs 11.0). 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.

KL Serials ships an update every 3 months, KL500A every 4 weeks. The most recent releases landed on October 8, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | KL Serials | KL500A |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/kl-serials/id1576480701/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 weeks** |
| Monetization | Free | — |
| Size | 29 MB | 31 MB |
| Requires iOS | **9.0** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Hangzhou Junce Instruments Co., Ltd.](https://appshunter.io/developer/1535583983) | [磊磊 周](https://appshunter.io/developer/1708841052) |

## What reviewers say

### 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


### KL500A

[App page](https://appshunter.io/ios/app/kl500a/id6470735168)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is KL Serials free?

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

### Is KL500A free?

KL500A is free to download, with no in-app purchases.

### Do KL Serials or KL500A have ads?

Neither KL Serials nor KL500A shows ads.

### Which is updated more often, KL Serials or KL500A?

KL Serials ships an update every 3 months, and KL500A every 4 weeks. Most recently, KL Serials was updated on October 8, 2026 and KL500A on October 7, 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.*