# OBD Ninja vs SlopeLink

The clearest difference is in-app purchases: SlopeLink at none against OBD Ninja's 2. OBD Ninja's advantage is ads (none vs shown) and update cadence (weekly vs every 4 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. OBD Ninja sells 2 in-app purchases, starting at $4.99 per month. SlopeLink asks for nothing beyond the download.

OBD Ninja ships an update weekly, SlopeLink every 4 months. Both last shipped on October 31, 2026.

## The numbers

| Metric | OBD Ninja | SlopeLink |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Weekly** | Every 4 months |
| Size | 48 MB | 43 MB |
| Requires iOS | 15.5 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [SKYPHIC STUDIO](https://appshunter.io/developer/1826683961) | [ShihHao Liu](https://appshunter.io/developer/1831960964) |

## What reviewers say

### OBD Ninja

[App page](https://appshunter.io/ios/app/obd-ninja/id6758688512)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OBD Ninja Premium | $4.99 | per month |
| OBD Ninja Premium | $39.99 | per year |


### SlopeLink

[App page](https://appshunter.io/ios/app/slopelink/id6784291045)

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

**In-app purchases:** none


## Frequently asked questions

### Is OBD Ninja free?

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

### Is SlopeLink free?

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

### Do OBD Ninja or SlopeLink have ads?

SlopeLink shows ads; OBD Ninja does not.

### Which is updated more often, OBD Ninja or SlopeLink?

OBD Ninja ships an update weekly, and SlopeLink every 4 months. Most recently, OBD Ninja was updated on October 31, 2026 and SlopeLink on October 31, 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.*