greenApes vs Zero CO2
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
greenApes
Earn digital currency by performing sustainable actions and completing challenges. Use your earnings to support environmental and social initiatives, and unlock rewards. Connect with other apps to automatically track eco-friendly activities.
- Earn TWIN coins for sustainable actions
- Support environmental and social initiatives
- Unlock rewards and surprises
- Connect with Apple Health to track activity
- Complete fun challenges
- Share stories and ideas
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greenApes is the app that cares. Make a difference, get rewarded! Collect TWIN coins with real-life daily sustainable actions and by completing fun challenges. Make a difference! Use TWIN coins to support environmental and social initiatives in the Donate section. Unlock boxes with real rewards and surprises! Increase your positive impact with greenApes: your sustainable actions make you earn TWIN coins, which you can use to support projects and initiatives that are helping out our planet. But there's more: the more you donate the greater rewards you will unlock! You can earn TWIN coins automatically by connecting your favourite apps, such as Apple Health, to earn points every time you walk and bike. You can also earn TWIN for completing fun challenges and for inspiring the community with your stories and idea. Finally you'll claim Secret Codes (with lots of coins) by joining environmental initiatives and for choosing environmentally friendly services & products. The greenApes platform is available internationally, but some cities and organizations enjoy a special experience. Rewards availability also varies depending on the country you're in. If you’d like to launch a custom campaign and promote sustainable behaviours in your city, company or organization get in touch: info@greenapes.com
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.
Screenshots
Verdict
The clearest difference is rating: Zero CO2 at 5.0 against greenApes's 4.5. Zero CO2 also leads on update cadence (every 3 days vs every 2 weeks) and review sentiment (100% vs 77%). greenApes'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. greenApes asks for nothing beyond the download.
Zero CO2 holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 4 respectively. Written reviews point the same way: 77% of greenApes's written reviews are positive against 100% of Zero CO2's.
greenApes ships an update every 2 weeks, Zero CO2 every 3 days. The most recent releases landed on October 1, 2026 and September 30, 2026 respectively.
| Parameter | greenApes | Zero CO2 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 77.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 2 | 4 — better |
| Update frequency | Every 2 weeks | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported — better | Free with in-app purchases |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 18.0 | 15.5 — better |
| Further details — not scored | ||
| Size | 37 MB | 40 MB |
| Age rating | 4+ | 12+ |
| Developer | greenApes | Caramba App Development |
Customer experience
greenApes
Zero CO2
In-app purchases
greenApes
No in-app purchases
Zero CO2
- Plant your tree$0.99









