Comparison

Zero CO2 vs Carbon Cred

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

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.

Highlights
  • Earn credits for walking, biking, and public transit
  • Redeem credits for cash
  • Businesses offset emissions
  • Generate ESG data
  • Increase employee engagement
Features
Read full description

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

Zero CO24 screens
Carbon Cred4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Zero CO2 sells 1 one-off in-app purchase. Carbon Cred asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

Zero CO2 ships an update every 3 days, Carbon Cred every 3 weeks. Both last shipped on November 3, 2026.

Scorecard7 real differences · 3 level
Zero CO2 versus Carbon Cred: the parameters behind the verdict, then further details
ParameterZero CO2Carbon Cred
PriceFreeFree
Rating5.0 (4 ratings) — better3.0 (3 ratings)
Positive reviews100.0% of reviews — better75.0% of reviews
Number of ratings4 — better3
Update frequencyEvery 3 days — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPod — betteriPhone
Requires iOS15.5 — better18.4
Further details — not scored
Size40 MB42 MB
Age rating12+4+
DeveloperCaramba App DevelopmentCarbon Chit Inc.

Customer experience

Zero CO2

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Carbon Cred

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

In-app purchases

1 purchases

Zero CO2

One-time1
  • Plant your tree$0.99
None

Carbon Cred

No in-app purchases

Questions

Is Zero CO2 free?
Zero CO2 is free to download, with in-app purchases available.
Is Carbon Cred free?
Carbon Cred is free to download, with no in-app purchases.
Which has better reviews, Zero CO2 or Carbon Cred?
Zero CO2 is rated higher. Zero CO2 averages 5.0 out of 5 from 4 ratings, while Carbon Cred averages 3.0 from 3 ratings.
Do Zero CO2 or Carbon Cred have ads?
Zero CO2 shows ads; Carbon Cred does not.
Which is updated more often, Zero CO2 or Carbon Cred?
Zero CO2 ships an update every 3 days, and Carbon Cred every 3 weeks. Most recently, Zero CO2 was updated on November 3, 2026 and Carbon Cred on November 3, 2026.

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