Carbon Coins vs ePdfUB
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Carbon Coins
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.
- Earn Carbon Coins for recycling
- Manage user accounts
- Redeem points for rewards
- Find nearby recycling machines
- View promotions
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Carbon Coins is committed to encouraging everyone to protect the environment through mobile app and Reserve Vending Machine. Through this app, users can - Save Points (Carbon Coins) earned from recycling - Manage Accounts - Redeem Rewards - Find nearby Reserve Vending Machine - View the latest Promotion
ePdfUB
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Say goodbye to rigid, zoom-and-scroll PDFs. All processing happens 100% locally on your device—ensuring absolute privacy and offline capability. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Carbon Coins | ePdfUB |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.0 — better | 26.2 |
| Further details — not scored | ||
| Size | 62 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Carbon World Limited | Chia Hsien Wei |
In-app purchases
Carbon Coins
No in-app purchases
ePdfUB
- Yearly$0.991 Year
- lifetime$2.99
