Comparison

Kora Sustainability vs Zero CO2

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

Head to head
About

Kora Sustainability

Track your environmental impact by measuring sustainable lifestyle choices like mobility, energy use, and purchasing habits. Earn rewards for eco-friendly actions and reduce your carbon footprint through a combination of moral and financial incentives.

Highlights
  • Track sustainable lifestyle choices
  • Measure impact on the planet
  • Earn rewards for eco-friendly actions
  • Reduce CO2 emissions
  • Compare progress with goals and others
  • Integrates with Apple Health for steps and distance
Features
Read full description

Kora app will help you to track your impact on the planet through measuring sustainable lifestyle choices including mobility, energy and purchasing behaviour. Kora also rewards sustainable behaviour of its users. This way CO2 emissions are reduced combining both moral and financial motivation. Kora helps you to better understand the effects of your choices so that you can make more informed decisions and learn about how you can make daily choices towards sustainability. You can then compare your progress with your own personal carbon saving goals, with your friends and with the collective action of your region or country. Share our mission with others so that we can work together to take responsible climate action. Kora app integrates with the Health app. Kora uses the Health App to user get steps count and walking distance. Kora rewards contest rules: Kora rewards are the prizes available to Kora app users who earn the required amount of Kora points and redeem them in Kora built-in marketplace. There is a limited quantity of each prize item available in the marketplace and it is specified for each item. The items are served on the first came - first served basis. Those users of Kora app, that earn the necessary amount of points first will be able to be first to redeem their Koras for the rewards available. Items in Kora marketplace are provided by Kora itself and our Partners/Sponsors. Apple is not a sponsor of the items available as Kora rewards. More information on rewards and rules of how Koras are being earned is available at https://kora.app/howitworks Premium Membership details: You can buy the Offset program via in–app purchases within the app. We provide 3 monthly offsetting programs - Sprout, Tree and Forest. If you opt for the subscription, you pay the fixed price for your country which is displayed in the app. Payment will be charged to your iTunes Account at confirmation of purchase. Subscriptions will automatically renew at the end of the period. You can turn off the auto-renewal at any time up until 24-hours before the end of the subscription period in your Account Settings in iTunes after purchase. It is not possible to refund a subscription or cancel a subscription during the current period. When you cancel the auto-renewal, access to the offset features will not expire immediately, you will have access until the end of the current payment period. Do you have further questions about app? Contact us via email: hello@kora.app Terms of Use: https://www.kora.app/terms Privacy Policy: https://www.kora.app/privacy EULA: https://www.kora.app/terms

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.

Screenshots

Kora Sustainability4 screens
Zero CO24 screens

Verdict

The call

The clearest difference is rating: Zero CO2 at 5.0 against Kora Sustainability's 4.0. Zero CO2 also leads on update cadence (every 3 days vs fortnightly) and review sentiment (100% vs 75%). Kora Sustainability's advantage is ads (none vs shown). On price, ratings volume, in-app purchases and monetization model 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. Kora Sustainability sells 5 in-app purchases, starting at $1.99 per month and Zero CO2 sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Zero CO2 holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 4 respectively. Written reviews point the same way: 75% of Kora Sustainability's written reviews are positive against 100% of Zero CO2's.

UpkeepUpdate frequency

Kora Sustainability ships an update fortnightly, Zero CO2 every 3 days. Both last shipped on November 3, 2026.

Scorecard4 real differences · 6 level
Kora Sustainability versus Zero CO2: the parameters behind the verdict, then further details
ParameterKora SustainabilityZero CO2
PriceFreeFree
Rating4.0 (3 ratings)5.0 (4 ratings) — better
Positive reviews75.0% of reviews100.0% of reviews — better
Number of ratings34 — better
Update frequencyFortnightlyEvery 3 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.1 — better15.5
Further details — not scored
Size108 MB40 MB
Age rating12+12+
DeveloperKora Sustainability Solution SIACaramba App Development

Customer experience

Kora Sustainability

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews4 reviews
Positive75.0%
Neutral0.0%
Negative25.0%

Zero CO2

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

In-app purchases

5 purchases

Kora Sustainability

Subscriptions5
  • Adventurer monthly$1.991 Month
  • Sprout Offset Subscription$3.991 Month
  • Tree Offset Subscription$7.991 Month
Show 2 more
  • Forest Offset Subscription$15.991 Month
  • Adventurer yearly$39.991 Year
1 purchases

Zero CO2

One-time1
  • Plant your tree$0.99

Questions

Is Kora Sustainability free?
Kora Sustainability is free to download, with in-app purchases available.
Is Zero CO2 free?
Zero CO2 is free to download, with in-app purchases available.
Which has better reviews, Kora Sustainability or Zero CO2?
Zero CO2 is rated higher. Kora Sustainability averages 4.0 out of 5 from 3 ratings, while Zero CO2 averages 5.0 from 4 ratings.
Do Kora Sustainability or Zero CO2 have ads?
Zero CO2 shows ads; Kora Sustainability does not.
Which is updated more often, Kora Sustainability or Zero CO2?
Kora Sustainability ships an update fortnightly, and Zero CO2 every 3 days. Most recently, Kora Sustainability was updated on November 3, 2026 and Zero CO2 on November 3, 2026.

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