# 2zero Climathon — Sustainable Living > Personal climate app for carbon footprint reduction and sustainability challenges. (iPhone/iPad app by 2zero GmbH.) - Source: https://appshunter.io/ios/app/2zero-climathon/id1458584431 (this page in markdown: same URL + `.md`) - Developer: [2zero GmbH](https://appshunter.io/developer/1624455527) - Category: Lifestyle, Health & Fitness - Price: Free - Rating: 5.00/5 from 1 App Store ratings · 44 written reviews indexed - Age rating: 4+ - Requires: iOS 15.0 · 89 MB - Languages: American English, French (France), German (Germany), European Spanish - Released: 2019-04-13 - Data updated: 2026-08-31 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/2zero-climathon/id1458584431/reviews.md ## What is 2zero Climathon? 2zero (formerly the Climate Compass) is your personal climate app and the officiall Klimathon app. It helps you to actively reduce your carbon footprint with the help of a CO2 calculator & multiple CO2 challenges. Become part of a Klimathon or our 2Zero community and support our Sustainability Promise. 2zero is the perfect sustainability app for a start into a CO2 neutral future. Protect the climate together, we show you how! -I would like to participate in a Klimathon. Am I in the right place?- You are absolutely right! 2zero (formerly Climate compass) is the official app of the Klimathon. Simply select your Klimathon organizer in the Community Selection step of the registration process and you'll be part of your Klimathon, enjoying all the benefits of your community. Be ready for 42 days of climate protection! -How does 2zero work?- 1. Calculate your own ecological footprint With our CO2 calculator you can easily calculate your ecological footprint. We already offer you a shortened version of the calculator during onboarding. As soon as you have joined your community, you can use the calculator in its full complexity and calculate your customized CO2 footprint. The sustainability calculator was developed in cooperation with the Fraunhofer Institute and the University of Kassel, among others. 2. Master different challenges to reduce your CO2 consumption More than 160 climate challenges focus on different topics of everyday life. For completing a challenge you receive valuable climate points. Of course, all challenges include detailed information texts that explain the circumstances and effects of the challenge in detail. The data is always up to date thanks to cooperation with Worldwatchers, Frauenhofer.iee, the Wuppertal Institute and the University of Kassel. 3. Get sustainable rewards for your climate protection efforts Redeem your well-earned climate points for exciting rewards from the sustainability sector. Our partner network is constantly growing, so you can expect new offers on a regular basis. 4. Compete with other climate protectors Fancy a bit of competition? (it's all about climate protection, so there are really only winners here!) Create your own team or join one of the existing teams and collect climate points for your team. How much CO2 can you save together? -Other features- Have a look at our news section. You can expect exciting news about climate protection actions & events. Our CO2 Challenges are not enough for you? Our guidebook provides you with even more tips & tricks on climate protection & sustainable living. The Klimathon App provides the collaborative and digital platform to complete our Climate Challenges. The CO2 Calculator and the different CO2 Challenges help you to reduce your ecological footprint. You can either participate in a Klimathon or in our 2Zero Community and take your first steps towards more sustainability. As your personal climate compass, our sustainability app offers you a great opportunity for sustainable change in everyday life. Let's go, let's protect the climate together. ## Key features - CO2 calculator - Climate challenges - Sustainability rewards - Team competitions - News and tips - Community participation ## Recent user reviews (10 of 44) All indexed reviews: https://appshunter.io/ios/app/2zero-climathon/id1458584431/reviews.md ### 1/5 — fehlerbehaftet *2025-11-05, version 7.6.17* Die App stürzt ca alle 24h ab, und dann muss man sie neu starten. Die „funfacts“ laufen zeitgesteuert von rechts nach links durch, man kann sie nicht absichtlich durchblättern, wenn man schneller oder langsamer lesen möchte. ### 1/5 — Als interessierte Laiin brauche ich Copilot, um die App zu navigieren…😳 *2025-09-22, version 7.6.16* Navigation verbesserungsbedürftig. ### 3/5 — Auf einen guten Weg *2025-05-05, version 7.6.9* Für mehr Sterne gut, aber die CO2 Bilanzierung ist zu pauschal, so kann ich zB bei Konsum nicht vermerken dass ich 2.Hand gekauft und damit deutlich weniger co2 produziert habe ### 4/5 — Tolle Aktion *2025-03-18, version 7.6.6* Der Klimathon als Aktion ist super!!! Lernen (bzw. auffrischen) mit viel Spiel, Spaß und Wettbewerb- voll mein Ding! Die App ist teils etwas unlogisch bzw. umständlich und die Inhalte aller Challenges sollten erhalten bleiben. ### 1/5 — Bewertungen werden gelöscht wow *2025-03-18, version 7.6.6* Schlechteste app in der Geschichte. Ihr sagt man ist unsichtbar wenn man anonym aktiviert. Gelogen, man sieht das Profilbild, nur der Name wird nicht angezeigt. Grauenhafte Quizgestaltung. Und dann Bewertungen löschen. Dann kann ich auch blau wählen. Bärendienst wirklich ### 2/5 — Unübersichtlich *2025-03-17, version 7.6.6* Wo findet man da denn die „Challenges“? ### 1/5 — Zu unübersichtlich *2025-03-15, version 7.6.6* Hab lang gebraucht um zu sehen was ich tun kann/ soll. Und Werbung gehört in sowas nicht rein. ### 3/5 — zu viel Werbung *2025-03-08, version 7.6.3* Zuerst fand ich die App ganz gut, viele interessante Artikel und nützliche Tipps. Für jemanden, der sich noch nicht mit Klimaschutz beschäftigt hat bestimmt sehr aufschlussreich. Inzwischen nervt mich aber die viele Werbung, und die Weiterleitung auf Anbieterseiten. Das hat nichts mit einer unabhängigen Beratung zu tun. Sich bei Enpal über eine Solaranlage zu informieren kann ich zum Beispiel überhaupt nicht empfehlen, wenn man dort einmal registriert ist, bekommt man es mit penetranten Drückermethoden zu tun. ### 3/5 — Nährboden für Scharlatane und Influenza *2024-09-24, version 7.3.29* Die Grundidee ist gut. Jedoch kann jeder eintragen was er will. Somit können sich Einzelpersonen oder auch Firmen CO2 neutraler darstellen als sie wirklich sind. Oder die wenigen Ehrlichen Menschen mit ihren Ergebnissen Prahlen. Allein die Erstellung und Server verbrauchen Energie. ### 3/5 — Eigentlich ok….. *2024-01-09, version 7.2.24* Für den ersten Überblick finde ich die App ganz prima. Allerdings gelingt mir keine zweite Bestandsaufnahme (nachdem wir einige Dinge verbessert haben). Ich werde entweder auf die Communities verwiesen oder die App lädt ewig. Was mache ich verkehrt? Kann man nur einmal den Fußabdruck bestimmen? ## Frequently asked questions about 2zero Climathon ### Is 2zero Climathon free to use? Yes, 2zero Climathon is completely free to download and use. It is available for iPhone, iPad, and iPod devices. ### Does 2zero Climathon have ads? No, 2zero Climathon does not contain advertisements. It is a free app focused on climate action without interruptions. ### How often is 2zero Climathon updated? The app was last updated on June 18, 2026, with version 7.8.7. This indicates a commitment to regular updates and improvements. ### What is the age rating for 2zero Climathon? 2zero Climathon has an age rating of 4+, making it suitable for a wide range of users interested in environmental topics. ### How accurate is the CO2 calculator in 2zero Climathon? The sustainability calculator was developed in cooperation with the Fraunhofer Institute and the University of Kassel, suggesting a high level of accuracy and scientific backing. ### Can I participate in a Klimathon using 2zero Climathon? Yes, 2zero Climathon is the official app of the Klimathon. You can select your Klimathon organizer during registration to join and participate in 42 days of climate protection. ### What kind of rewards can I get with 2zero Climathon? You can redeem earned climate points for exciting rewards from the sustainability sector. The partner network is constantly growing, offering new offers regularly. ### How does 2zero Climathon compare to other climate apps? 2zero Climathon offers a unique combination of a CO2 calculator, over 160 climate challenges, team competitions, and rewards, all within a collaborative community platform. ## Version history (last 5 releases) ### 7.8.10 — 2026-08-21 Bug fixes ### 7.8.9 — 2026-08-11 Bug fixes ### 7.8.8 — 2026-07-01 Minor bug fixes ### 7.8.7 — 2026-06-18 Stability improvements and bug fixes ### 7.8.6 — 2026-06-10 Minor bug fixes ## Apps similar to 2zero Climathon | App | Rating | Price | Category | | --- | --- | --- | --- | | [eevie](https://appshunter.io/ios/app/eevie/id1365185910) | 3.7 (15) | Free | Lifestyle | | [Modehaus ID Sievers App](https://appshunter.io/ios/app/modehaus-id-sievers-app/id6476773683) | — | Free | Lifestyle | | [EcoHero - Eco Activity Tracker](https://appshunter.io/ios/app/ecohero-eco-activity-tracker/id1474213908) | 4.8 (25) | Free | Lifestyle | | [Earth Hero: Climate Change](https://appshunter.io/ios/app/earth-hero-climate-change/id1458057746) | 4.9 (784) | Free | Lifestyle | | [Mein ZVO](https://appshunter.io/ios/app/mein-zvo/id6479331706) | — | Free | Lifestyle | | [Ein Guter Tag](https://appshunter.io/ios/app/ein-guter-tag/id1438941690) | — | Free | Lifestyle | ## More apps by 2zero GmbH - [2zero Business](https://appshunter.io/ios/app/2zero-business/id6448752711) All apps by 2zero GmbH: https://appshunter.io/developer/1624455527 ## Related topics [klimahelden darmstadt-dieburg](https://appshunter.io/ios/topics/klimahelden-darmstadt-dieburg) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-31.*