# Carbon Coins vs ePdfUB

The clearest difference is price: Carbon Coins at Free against ePdfUB's $3.99. Carbon Coins also leads on in-app purchases (none vs 2) and iOS requirement (14.0 vs 26.2). On update cadence, ads and device support there is nothing between them.

Carbon Coins is free to download; ePdfUB costs $3.99 up front. ePdfUB sells 2 in-app purchases, starting at $0.99 per year. Carbon Coins asks for nothing beyond the download.

Carbon Coins ships an update every 6 weeks, ePdfUB every 2 months. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Carbon Coins | ePdfUB |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/carbon-coins-shareecosystem/id1437884243/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free | — |
| Size | 62 MB | 7 MB |
| Requires iOS | **14.0** | 26.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Carbon World Limited](https://appshunter.io/developer/1437884242) | [Chia Hsien Wei](https://appshunter.io/developer/6778780638) |

## What reviewers say

### Carbon Coins

[App page](https://appshunter.io/ios/app/carbon-coins-shareecosystem/id1437884243)

This app incentivizes environmental protection by allowing users to earn and manage points for recycling. Users can redeem these points for rewards and locate nearby recycling machines. It aims to encourage eco-friendly habits through a gamified experience.

**Highlights:** Earn Carbon Coins for recycling, Manage user accounts, Redeem points for rewards, Find nearby recycling machines, View promotions

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

**In-app purchases:** none


### ePdfUB

[App page](https://appshunter.io/ios/app/epdfub/id6780764422)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Yearly | $0.99 | per year |
| lifetime | $2.99 | one-time |


## Frequently asked questions

### Is Carbon Coins free?

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

### Is ePdfUB free?

ePdfUB costs $3.99, and also offers in-app purchases.

### Do Carbon Coins or ePdfUB have ads?

Neither Carbon Coins nor ePdfUB shows ads.

### Which is updated more often, Carbon Coins or ePdfUB?

Carbon Coins ships an update every 6 weeks, and ePdfUB every 2 months. Most recently, Carbon Coins was updated on November 2, 2026 and ePdfUB on October 31, 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.*