# OBD Diagnostics vs RevDash

The clearest difference is price: OBD Diagnostics at Free against RevDash's $1.99. RevDash's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

OBD Diagnostics is free to download; RevDash costs $1.99 up front. OBD Diagnostics sells 1 one-off in-app purchase. RevDash asks for nothing beyond the download.

OBD Diagnostics ships an update monthly, RevDash every 3 days. The most recent releases landed on September 18, 2026 and September 4, 2026 respectively.

## The numbers

| Metric | OBD Diagnostics | RevDash |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 3 days** |
| Size | 23 MB | 14 MB |
| Requires iOS | 26.2 | **17.0** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [EJSmith](https://appshunter.io/developer/305393602) | [Joshua Figueroa](https://appshunter.io/developer/1759474900) |

## What reviewers say

### OBD Diagnostics

[App page](https://appshunter.io/ios/app/obd-diagnostics/id6759762253)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


### RevDash

[App page](https://appshunter.io/ios/app/revdash/id6764164749)

**In-app purchases:** none


## Frequently asked questions

### Is OBD Diagnostics free?

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

### Is RevDash free?

RevDash costs $1.99, with no in-app purchases.

### Do OBD Diagnostics or RevDash have ads?

OBD Diagnostics shows ads; RevDash does not.

### Which is updated more often, OBD Diagnostics or RevDash?

OBD Diagnostics ships an update monthly, and RevDash every 3 days. Most recently, OBD Diagnostics was updated on September 18, 2026 and RevDash on September 4, 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.*