Zero CO2 vs Carbon Cred
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zero CO2
This app tracks your phone's carbon footprint from data usage and helps you offset emissions by planting trees. Monitor your CO2 output and see how your reforestation efforts compensate for it, receiving certificates for each planted tree.
- Monitors phone carbon footprint
- Tracks CO2 emissions from data usage
- Compensates emissions by planting trees
- Visualizes CO2 emissions and tree compensation
- Provides certificates for planted trees
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ZeroCO2 monitors your phone's carbon footprint and keeps track of the CO2 emissions from your device. These CO2 emissions come from the data usage of your device. All cloud-services, emails, search queries, social network activities etc, are facilitated by large Data Centers, which consume large amounts of electricity to keep your data streams flowing. Over its lifetime, an iPhone can emit up to 60 kilograms of CO2. This electricity typically does not come 100% from green sources, and therefore leads to CO2 emissions. That's equivalent to more than 300 kilometers driving in a petrol-fueled car. Do you want your phone to become CO2-neutral? Then use the app to plant trees to compensate your emissions! With its comprehensive graphs, you can easily monitor how much CO2 you emit, and how your planted trees compensate these emissions. With every planted tree, you receive a certificate that proves the authenticity and shows the location of the planted tree. Prevent climate change, and become a carbon-neutral iPhone user! Note: Trees are planted by our partner Tree-Nation, the worldwide platform to reforest the world and fight climate change. All trees planted by Tree-Nation are certified by the best in class and most renowned certification standards that exist in this field. For this, Tree-Nation works with third-party certification organizations such as VCS, Gold Standard, and Plan Vivo.
Carbon Cred
This app rewards employees with digital credits for eco-friendly commutes like walking or biking. These credits can be redeemed for cash. Businesses can use it to offset emissions and boost employee engagement.
- Earn credits for walking, biking, and public transit
- Redeem credits for cash
- Businesses offset emissions
- Generate ESG data
- Increase employee engagement
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Carbon Cred is a free-market solution to climate change for businesses and employees. Employees who use the app can receive Carbon Creds for walking, biking, and using public transit instead of driving to and from work. These Creds can be exchanged for real cash. Businesses using the app can offset their emissions with personal carbon credits generated by their employees, and benefit from new streams of ESG data and increased employee engagement.
Screenshots
Verdict
The clearest difference is rating: Zero CO2 at 5.0 against Carbon Cred's 3.0. Zero CO2 also leads on update cadence (every 3 days vs every 3 weeks) and review sentiment (100% vs 75%). Carbon Cred's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, ratings volume 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
Both are free to download. Zero CO2 sells 1 one-off in-app purchase. Carbon Cred asks for nothing beyond the download.
Zero CO2 holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 4 and 3 respectively. Written reviews point the same way: 100% of Zero CO2's written reviews are positive against 75% of Carbon Cred's.
Zero CO2 ships an update every 3 days, Carbon Cred every 3 weeks. Both last shipped on November 3, 2026.
| Parameter | Zero CO2 | Carbon Cred |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | 3.0 (3 ratings) |
| Positive reviews | 100.0% of reviews — better | 75.0% of reviews |
| Number of ratings | 4 — better | 3 |
| Update frequency | Every 3 days — better | Every 3 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15.5 — better | 18.4 |
| Further details — not scored | ||
| Size | 40 MB | 42 MB |
| Age rating | 12+ | 4+ |
| Developer | Caramba App Development | Carbon Chit Inc. |
Customer experience
Zero CO2
Carbon Cred
In-app purchases
Zero CO2
- Plant your tree$0.99
Carbon Cred
No in-app purchases









