# BK400 vs Car Maintenance Tracker

The clearest difference is in-app purchases: BK400 at none against Car Maintenance Tracker's 3. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Car Maintenance Tracker sells 3 in-app purchases, starting at $5.99 per month. BK400 asks for nothing beyond the download.

Both ship on a similar rhythm, roughly weekly. Both last shipped on October 10, 2026.

## The numbers

| Metric | BK400 | Car Maintenance Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | Weekly |
| Size | 21 MB | 40 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [祖策 谢](https://appshunter.io/developer/983519195) | [Anthony Chui](https://appshunter.io/developer/6779802641) |

## What reviewers say

### BK400

[App page](https://appshunter.io/ios/app/bk400/id6760681499)

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

**In-app purchases:** none


### Car Maintenance Tracker

[App page](https://appshunter.io/ios/app/car-maintenance-tracker-log/id6795490357)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $5.99 | per month |
| Pro Yearly | $17.99 | per year |
| Pro Lifetime | $29.99 | one-time |


## Frequently asked questions

### Is BK400 free?

BK400 is free to download, with no in-app purchases.

### Is Car Maintenance Tracker free?

Car Maintenance Tracker is free to download, with in-app purchases available.

### Do BK400 or Car Maintenance Tracker have ads?

Neither BK400 nor Car Maintenance Tracker shows ads.

### Which is updated more often, BK400 or Car Maintenance Tracker?

BK400 ships an update weekly, and Car Maintenance Tracker weekly. Most recently, BK400 was updated on October 10, 2026 and Car Maintenance Tracker on October 10, 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.*