# Diesel CO2 vs ULOCK

The clearest difference is update cadence: ULOCK at every 2 months 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, ULOCK every 2 months. The most recent releases landed on October 15, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Diesel CO2 | ULOCK |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 2 MB | 52 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) | [Uspace Tech Ltd.](https://appshunter.io/developer/1200776654) |

## 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


### ULOCK

[App page](https://appshunter.io/ios/app/ulock/id1453949429)

This app allows users to manage and share their smart parking spaces. Earn extra income by renting out your spot when not in use and enjoy the convenience of smart control. Contribute to a greener planet by reducing search time for parking.

**Highlights:** Smart parking space management, Earn income by sharing parking spots, One-tap control for parking barriers, View parking customer information, Track parking details and earnings, Contribute to reduced carbon emissions

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

**In-app purchases:** none


## Frequently asked questions

### Is Diesel CO2 free?

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

### Is ULOCK free?

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

### Do Diesel CO2 or ULOCK have ads?

Neither Diesel CO2 nor ULOCK shows ads.

### Which is updated more often, Diesel CO2 or ULOCK?

Diesel CO2 ships an update every 10 months, and ULOCK every 2 months. Most recently, Diesel CO2 was updated on October 15, 2026 and ULOCK 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.*