# Diesel CO2 vs Dauntless OBD

The clearest difference is update cadence: Dauntless OBD at every 3 weeks against Diesel CO2's every 10 months. 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.

Diesel CO2 ships an update every 10 months, Dauntless OBD every 3 weeks. The most recent releases landed on October 15, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Diesel CO2 | Dauntless OBD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (12 ratings)](https://appshunter.io/ios/app/dauntless-obd/id6467540766/reviews)** |
| Number of ratings | — | **12** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 2 MB | 2 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Addison Mai](https://appshunter.io/developer/391450820) | [Dauntless Devices LLC](https://appshunter.io/developer/1706964112) |

## What reviewers say

### Diesel CO2

[App page](https://appshunter.io/ios/app/diesel-co2/id471325738)

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

**In-app purchases:** none


### Dauntless OBD

[App page](https://appshunter.io/ios/app/dauntless-obd/id6467540766)

Configure your DauntlessOBD device wirelessly. Access vehicle data streams, diagnostic trouble codes, and manage firmware updates. A DauntlessOBD device is required for full functionality.

**Highlights:** Wireless pairing, Firmware updates, Vehicle data streams, Diagnostic trouble codes (DTCs), Device configuration

**In-app purchases:** none


## Frequently asked questions

### Is Diesel CO2 free?

Diesel CO2 is free to download, with no in-app purchases.

### Is Dauntless OBD free?

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

### Do Diesel CO2 or Dauntless OBD have ads?

Neither Diesel CO2 nor Dauntless OBD shows ads.

### Which is updated more often, Diesel CO2 or Dauntless OBD?

Diesel CO2 ships an update every 10 months, and Dauntless OBD every 3 weeks. Most recently, Diesel CO2 was updated on October 15, 2026 and Dauntless OBD on October 30, 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.*