# Modpro AI vs Carbon Confession

The clearest difference is in-app purchases: Modpro AI at none against Carbon Confession's 1. Modpro AI also leads on update cadence (weekly vs every 5 weeks) and ratings volume (135 vs 5). Carbon Confession's advantage is rating (5.0 vs 4.7). On price, review sentiment, ads and device support there is nothing between them.

Both are free to download. Carbon Confession sells 1 in-app purchase, starting at $3.99 per month. Modpro AI asks for nothing beyond the download.

Carbon Confession holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Modpro AI has 135 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 95% of Modpro AI's written reviews are positive against 100% of Carbon Confession's.

Modpro AI ships an update weekly, Carbon Confession every 5 weeks. The most recent releases landed on October 28, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Modpro AI | Carbon Confession |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (135 ratings)](https://appshunter.io/ios/app/modpro-ai/id6755011876/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/carbon-confession/id6756328564/reviews)** |
| Number of ratings | **135** | 5 |
| Positive reviews | 94.9% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 5 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 94 MB | 48 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ModPro AI INC](https://appshunter.io/developer/1851335653) | [the biehn company llc](https://appshunter.io/developer/1860123799) |

## What reviewers say

### Modpro AI

[App page](https://appshunter.io/ios/app/modpro-ai/id6755011876)

This app serves as a central hub for automotive and motorcycle enthusiasts to track, organize, and optimize their custom builds. It offers professional build tracking, AI-powered recommendations, performance management, and a community forum for inspiration and connection.

**Highlights:** Professional build tracking, AI build advisor, Performance & spec management, Community garage, Part logging and management

**In-app purchases:** none


### Carbon Confession

[App page](https://appshunter.io/ios/app/carbon-confession/id6756328564)

Admit your environmental missteps anonymously in a digital confession booth. Earn forgiveness and track the collective impact of community actions. Turn guilt into positive contributions to environmental initiatives.

**Highlights:** Anonymous confession of environmental sins, Digital forgiveness certificates, Environmental impact theme selection, Track community impact ledger, Reflect on daily habits, Turn guilt into positive action

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| sub | $3.99 | per month |


## Frequently asked questions

### Is Modpro AI free?

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

### Is Carbon Confession free?

Carbon Confession is free to download, with in-app purchases available.

### Which has better reviews, Modpro AI or Carbon Confession?

Carbon Confession is rated higher. Modpro AI averages 4.7 out of 5 from 135 ratings, while Carbon Confession averages 5.0 from 5 ratings.

### Do Modpro AI or Carbon Confession have ads?

Neither Modpro AI nor Carbon Confession shows ads.

### Which is updated more often, Modpro AI or Carbon Confession?

Modpro AI ships an update weekly, and Carbon Confession every 5 weeks. Most recently, Modpro AI was updated on October 28, 2026 and Carbon Confession on October 12, 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.*