# KL Serials vs OBDocker

The clearest difference is in-app purchases: KL Serials at none against OBDocker's 7. KL Serials also leads on rating (4.5 vs 4.2) and iOS requirement (9.0 vs 13.0). OBDocker's advantage is update cadence (fortnightly vs every 3 months) and ratings volume (17 vs 2). On price, ads and device support there is nothing between them.

Both are free to download. OBDocker sells 7 in-app purchases, starting at $2.99 per month. KL Serials asks for nothing beyond the download.

KL Serials holds the better App Store score, 4.5 against 4.2. That said, the two scores are not equally well evidenced: OBDocker has 17 ratings behind it against 2, so its average is the more settled of the two.

KL Serials ships an update every 3 months, OBDocker fortnightly. The most recent releases landed on September 21, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | KL Serials | OBDocker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/kl-serials/id1576480701/reviews)** | [4.2 (17 ratings)](https://appshunter.io/ios/app/obdocker-obd2-car-scanner/id6466999549/reviews) |
| Number of ratings | 2 | **17** |
| Positive reviews | — | 48.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | **Free** | Freemium |
| Size | 29 MB | 238 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Hangzhou Junce Instruments Co., Ltd.](https://appshunter.io/developer/1535583983) | [Motorsure. Inc](https://appshunter.io/developer/1707281085) |

## 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


### OBDocker

[App page](https://appshunter.io/ios/app/obdocker-obd2-car-scanner/id6466999549)

This app acts as a professional OBD2 car scanner, enabling users to diagnose, service, and customize their vehicles. It offers comprehensive diagnostic modes, real-time data monitoring, and various service functions like oil resets and battery registration.

**Highlights:** Triple-mode diagnostics (Full-Systems, Multi-Systems, Quick Scan), Triple-mode live data monitoring (Health, Engine, Dash), Full-cycle service functions (Emissions Pre-Check, Control Tests, Oil Reset, Battery Registration), One-click car setting adjustments and retrofits, Supports a wide range of car brands and models

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OBD Pro (Monthly) | $2.99 | per month |
| OBD Pro Max (Monthly) | $7.99 | per month |
| OBD2 Pro (6 Months) | $14.99 | per 6 months |
| OBD Pro (Annual) | $17.99 | per year |
| Mechanic Access (Quarterly) | $19.99 | per 3 months |
| OBD Pro Max (Annual) | $47.99 | per year |
| OBD Pro Max (Permanent) | $119.99 | one-time |


## Frequently asked questions

### Is KL Serials free?

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

### Is OBDocker free?

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

### Which has better reviews, KL Serials or OBDocker?

KL Serials is rated higher. KL Serials averages 4.5 out of 5 from 2 ratings, while OBDocker averages 4.2 from 17 ratings.

### Do KL Serials or OBDocker have ads?

Neither KL Serials nor OBDocker shows ads.

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

KL Serials ships an update every 3 months, and OBDocker fortnightly. Most recently, KL Serials was updated on September 21, 2026 and OBDocker on September 27, 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.*