Comparison

CO₂ AR vs Climate Clock

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

Head to head
About

CO₂ AR

Features
Read full description

When burning coal, oil and gas, carbon dioxide—also known as CO₂—is released into the atmosphere. To date, CO₂ emissions have risen dramatically. In the short industrial history of just 250 years, humans have increased the amount of CO₂ in the atmosphere by around 40 %. An alarming value unprecedented on Earth in the past four million years. Humankind has accumulated CO₂ and other greenhouse gases in the atmosphere which has already increased average global temperature by one degree Celsius since 1750. Our app allows you to visualise the history of CO₂ emissions—and also the possible futures. By combining data from the Carbon Dioxide Information Analysis Center (CDIAC) and the baseline projections of CO₂ emissions by the Potsdam Institute for Climate Impact Research (PIK), we were able to visualize the CO₂ emissions from 1751 to 2100 on a highly detailed geographical level. The app also provides you with two possible CO₂ futures: one with a policy of measures against climate change—and one without.

About

Climate Clock

Features
Read full description

The Most Important Numbers in the World: The Climate Clock melds art, science, technology, and grassroots organizing to get 
the world to #ActInTime. Stay informed with lifelines, the climate clock, and the latest hopeful news updates on the climate clock. Stay informed about positive progress in fighting climate change. Countdown to when our carbon budget is exhausted. Track world’s energy from 
renewables. Use our widgets to stay informed and take action! Add them to your widget stack and watch faces. Quickly access the Action Clock to show the deadline 
and lifelines to others.

Screenshots

CO₂ AR2 screens
Climate Clock4 screens

Verdict

The call

The clearest difference is update cadence: CO₂ AR at daily against Climate Clock's every 2 days. CO₂ AR also leads on iOS requirement (11.0 vs 17.0). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

CO₂ AR ships an update daily, Climate Clock every 2 days. The most recent releases landed on September 30, 2026 and October 2, 2026 respectively.

Scorecard2 real differences · 4 level
CO₂ AR versus Climate Clock: the parameters behind the verdict, then further details
ParameterCO₂ ARClimate Clock
PriceFreeFree
Update frequencyDaily — betterEvery 2 days
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS11.0 — better17.0
Further details — not scored
Size95 MB11 MB
Age rating4+4+
DeveloperEkkehard PetzoldWoven GbR Dahlmann, Linz, Waetke, Wolf

In-app purchases

None

CO₂ AR

No in-app purchases

None

Climate Clock

No in-app purchases

Questions

Is CO₂ AR free?
CO₂ AR is free to download, with no in-app purchases.
Is Climate Clock free?
Climate Clock is free to download, with no in-app purchases.
Do CO₂ AR or Climate Clock have ads?
Neither CO₂ AR nor Climate Clock shows ads.
Which is updated more often, CO₂ AR or Climate Clock?
CO₂ AR ships an update daily, and Climate Clock every 2 days. Most recently, CO₂ AR was updated on September 30, 2026 and Climate Clock on October 2, 2026.

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