# Roomster vs Karbon

The clearest difference is review sentiment: Karbon at 78% against Roomster's 22%. Karbon also leads on rating (4.7 vs 4.0) and in-app purchases (none vs 10). Roomster's advantage is ratings volume (22K vs 15) and update cadence (every 3 days vs every 2 weeks). On price and device support there is nothing between them.

Both are free to download. Roomster sells 9 in-app purchases, starting at $9.99 per 7 days. Karbon asks for nothing beyond the download.

Karbon holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: Roomster has 22K ratings behind it against 15, so its average is the more settled of the two. Written reviews point the same way: 22% of Roomster's written reviews are positive against 78% of Karbon's.

Roomster ships an update every 3 days, Karbon every 2 weeks. The most recent releases landed on November 7, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Roomster | Karbon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (22K ratings)](https://appshunter.io/ios/app/roomster/id1045548013/reviews) | **[4.7 (15 ratings)](https://appshunter.io/ios/app/karbon-x/id1673803570/reviews)** |
| Number of ratings | **22K** | 15 |
| Positive reviews | 22.1% of reviews | **77.8% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#72** | — |
| Size | 99 MB | 91 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 9+ |
| Developer | [Roomster Corp.](https://appshunter.io/developer/1045548007) | [Karbon-X Project Inc.](https://appshunter.io/developer/1673803572) |

## What reviewers say

### Roomster

[App page](https://appshunter.io/ios/app/roomster/id1045548013)

**Currently charting:** #72 Top Grossing · Lifestyle (US App Store)

Find a room to rent or a compatible roommate globally. Connect with verified individuals and browse thousands of listings with photos and detailed descriptions. Securely message potential matches and receive real-time alerts for new opportunities.

**Highlights:** Browse rooms and apartments for rent, Connect with validated roommates, Global listings in 18 languages, Private in-app messaging, Easy profile setup with social validation, Real-time alerts

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full access | $9.99 | per 7 days |
| Full access | $11.99 | per 7 days |
| Full access | $19.99 | per month |
| Full access | $29.99 | per month |
| Full access | $49.99 | per 2 months |
| Id Verification | $2.99 | one-time |
| Id Verification | $5.99 | one-time |
| Background Check | $9.99 | one-time |
| Id Verification | $14.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 💡 Lots of options
- 🚀 Convenient for travelers

**What reviewers complain about**

- 💰 Expensive subscription
- 🔒 Privacy concerns
- 🐛 Buggy and glitchy
- 🗣️ Fake/spam messages
- 💰 Misleading pricing

**Reported bugs**

- Login issues
- Frequent crashes
- Listings not updating
- Verification problems

**Requested features**

- Better search filters
- Ability to delete account
- More transparent pricing
- Improved user experience


### Karbon

[App page](https://appshunter.io/ios/app/karbon-x/id1673803570)

This app allows environmentally conscious individuals and businesses to support clean energy and eco-friendly initiatives. Users can contribute to projects like tree planting and ocean de-acidification, track their impact, and receive achievement badges. Offset plans can be switched or canceled, with payments charged monthly or annually.

**Highlights:** Support tree planting and carbon reduction projects, Receive achievement badges, Switch supported projects, Attend eco-friendly events, Calculate carbon footprint, Monthly and annual offset plans

**Features:** Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Roomster free?

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

### Is Karbon free?

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

### Which has better reviews, Roomster or Karbon?

Karbon is rated higher. Roomster averages 4.0 out of 5 from 22K ratings, while Karbon averages 4.7 from 15 ratings.

### Do Roomster or Karbon have ads?

Roomster shows ads; Karbon does not.

### Which is updated more often, Roomster or Karbon?

Roomster ships an update every 3 days, and Karbon every 2 weeks. Most recently, Roomster was updated on November 7, 2026 and Karbon on November 3, 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.*