Comparison

Climate Timer vs Cerne

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

Head to head
About

Climate Timer

Track critical climate change deadlines and lifelines, discover positive news, and manage personal actions. Customize your experience with background themes and home screen widgets.

Highlights
  • Climate change deadline countdown
  • Renewable energy and land protection data
  • Climate news updates
  • Personal climate action planner
  • Customizable background themes
  • Home screen widget support
Features
Read full description

This application displays information published on "ClimateClock.world" and manages climate change self-action. 1. DEADLINE Time left to limit global warming to 1.5℃. 2. LIFELINE • World's energy from renewables • Land protected by indigenous people • Loss & Damage owed by G20 nations • Loss & Damage owed by G7 nations • Green Climate Fund 3. News Good news about climate change. 4. My actions Set My Actions against climate change for housing, transportation, food, consumer goods, and leisure. 5. Background selection • Theme color • Specified color • Image (Switching display of global warming-related images at 1-minute intervals from the free material site "Pixabay.com") 6. Widget Can place DEADLINE widget on home screen The display content accesses "ClimateClock.world" every 24 hours and downloads the latest. The displayed contents are subject to change. The content is displayed according to the device language, but as of November 2022, it is only available in English and Portuguese. (Default language is English, news is always in English only)

About

Cerne

Features
Read full description

Cerne is an app that connects technology and nature to help you measure, understand, and reduce your carbon footprint. With the power of iPhone augmented reality, you can identify tree species, measure trunk diameter and height, and discover how much CO₂ each tree can capture. Key Features • Carbon sequestration calculation: Use the camera to record trees and instantly see their potential for CO₂ capture. • Smart mapping: Every entry is saved on a large collaborative map that shows the real impact of each tree and the community. • Individual and collective data: Track your personal contribution and see the combined results of all users in real time. • Biodiversity revealed: Learn about the species present in your region and help expand knowledge about local flora. • Impact reports: Get clear statistics on CO₂ neutralized and estimated oxygen generated from the trees you register. How It Works 1. Capture and identify – Photograph the tree, identify its species, and record diameter and height using the camera and augmented reality. 2. Calculate and track – Cerne estimates carbon sequestration potential and oxygen release, creating a history of your positive impact. 3. Share and engage – Invite friends and watch the community’s strength grow, with data revealing the total carbon removed from the air. Why Use Cerne Every tree counts for the climate. By registering your discoveries, you contribute to a global database that supports environmental research, encourages reforestation actions, and promotes a more sustainable lifestyle. The app helps you visualize the real impact of small actions, turning every record into valuable information for the planet. Download Cerne and join a community that believes technology and nature can work together to reduce CO₂ and improve the air we breathe.

Screenshots

Climate Timer4 screens
Cerne4 screens

Verdict

The call

The clearest difference is update cadence: Cerne at every 4 days against Climate Timer's every 11 months. Climate Timer's advantage is iOS requirement (16.1 vs 26.0). 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

Climate Timer ships an update every 11 months, Cerne every 4 days. The most recent releases landed on September 20, 2026 and September 11, 2026 respectively.

Scorecard2 real differences · 8 level
Climate Timer versus Cerne: the parameters behind the verdict, then further details
ParameterClimate TimerCerne
PriceFreeFree
Rating3.0 (1 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 11 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad — betteriPhone
Requires iOS16.1 — better26.0
Further details — not scored
Size30 MB12 MB
Age rating4+4+
DeveloperMAKOTO SASAKIAndrei Rech

In-app purchases

None

Climate Timer

No in-app purchases

None

Cerne

No in-app purchases

Questions

Is Climate Timer free?
Climate Timer is free to download, with no in-app purchases.
Is Cerne free?
Cerne is free to download, with no in-app purchases.
Do Climate Timer or Cerne have ads?
Neither Climate Timer nor Cerne shows ads.
Which is updated more often, Climate Timer or Cerne?
Climate Timer ships an update every 11 months, and Cerne every 4 days. Most recently, Climate Timer was updated on September 20, 2026 and Cerne on September 11, 2026.

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