iPad
Two columns and a sidebar, in landscape or portrait, and more than one window in Split View or Stage Manager.
Transcript and description
A short motion-graphics video. Every app screen in it is a screen recording of the Decarbonr app on an iPhone simulator, with sample entries that the app’s own calculations created for the weeks before a simulated date (not a real person’s log); the clock in the status bar is fixed at 9:41 by the simulator. The app’s figures are estimates. No app content is added or changed, and titles, captions and callouts stay beside or behind the phone. There is no music and no voice-over.
How it was edited
- Pauses where nothing moves are shortened; frames are never reordered.
- Some motion is sped up, at most 1.4×.
- Some scenes come from separate recordings; what happened between them is not shown.
- Transitions between shots.
- Callouts with icons beside the phone name what the screen shows.
On screen
- 0:00“Know your carbon footprint” “Meals, trips and life at home, turned into estimates for your day, your week and your year” The Decarbonr app icon and the title of the video.
- 0:02Today — “Your footprint, one day at a time” “Today against your daily goal” “Insights on your week” Screen recording: the Today screen of the Dashboard with sample entries, a gauge with today’s estimate against the daily goal, totals by category and quick buttons; it scrolls to Insights (the last seven days against the seven before and the biggest source) and the chart of the last seven days.
- 0:07Food — “Log a meal by hand or by scan” “Pick a food and its weight” “Scan a meal or a barcode (AI add-on)” The Food tab: the cards to scan a meal or a barcode, adding food by hand, and today’s food total; it scrolls down today’s food entries, each added by hand.
- 0:11Barcode — “See where the number comes from” “Looked up on Open Food Facts” “Its climate data, or a category average” A barcode result for a pasta product: its CO₂e for the portion, a note that the figure comes from Agribalyse via Open Food Facts, the portion control, today’s total with this product, and the sources.
- 0:15Travel — “Every trip adds to your week” “Car, train, bus, plane or bike” “Compared with the same days last week” The Travel tab: the transport modes, this week’s total and trips with emissions by mode compared with the same days last week; it scrolls to today’s trips and the recent trips, each a sample entry.
- 0:20Home — “Life at home counts too” “Heating, electricity, water and more” “Each tracker with its last week” The Home tab: the last seven days of the home trackers against the seven days before, by tracker; it scrolls to the tracker cards for electricity, heating, water and home upkeep, then the everyday-life trackers.
- 0:24Decarbonr — “Track food, travel & home CO₂” “On the App Store” decarbonr.com End card. Screen recordings from the Decarbonr app · sample entries · all figures are estimates Product data: © Open Food Facts contributors (ODbL)
Decarbonr Know your carbon footprint
Decarbonr turns what you log — meals, trips and life at home — into your footprint for today, your week and a yearly estimate next to a 2-tonne target. Every figure is an estimate, and the app shows where it comes from.
Version 1.2 is on its way to the App Store
This page shows Decarbonr 1.2. Until Apple releases it, the App Store has version 1.1, which has no iPad layout, Apple Watch app, Home tab or Insights.
- No account
- No ads
- iPhone, iPad and Apple Watch
- 44 languages
How the numbers work
Estimates, with their sources
Decarbonr does not measure your emissions. It multiplies what you log by emission factors from published sources, and it tells you which source it used.
What a number is
An estimate in CO₂e. Food and travel use emission factors from published sources, listed in the app under Sources and methods. The home and lifestyle trackers use simpler averages. A meal photo gives an AI estimate.
What a number is not
Not a measurement, not a ranking against other people and not a forecast. Decarbonr shows nobody else's data and makes no projection about the future.
A common shorthand for a lifestyle compatible with 1.5 °C — a reference point, not a rule.
Estimates are marked ≈, and a barcode result that falls back to a food-category average says so.
In Decarbonr 1.2
What Decarbonr does
Every feature below is in version 1.2. Where a number has limits, the card says so.
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Your day, your week, your year
Today's total against your daily target, by category. Insights compare your last 7 days with the 7 days before, name your biggest source and count your logging streak. Charts show the week, the month and the year.
The yearly estimate appears once you have entries on 7 different days. It is shown next to the 2-tonne target and, for 32 countries, the country's average fossil CO₂ per person.
Today Sample entries -
Food, by hand or by scan
Choose a food and the amount. Or photograph a meal, and AI estimates its CO₂e ingredient by ingredient and suggests lower-carbon swaps. Or scan a barcode, and the product is looked up on Open Food Facts.
Meal-photo and barcode scanning are part of the AI add-on. A meal photo is sent for analysis only after you agree: it goes through Decarbonr's server to OpenAI.
Food Sample entries -
Barcode results that say where they come from
When a product has climate data (for example from Agribalyse), Decarbonr uses it. Otherwise it uses a food-category average and says which. Change the portion and see it against today's total.
A category average describes a typical product of that kind, not this exact product.
A barcode result Sample entries Product data: Open Food Facts contributors (ODbL) -
Every trip
Car (petrol, diesel or electric), plane, train, bus, cruise, bike or on foot. For flights and cruises, enter two cities and Decarbonr works out the distance. Train trips use a country-specific emission factor.
City names that are not in the app's built-in list are looked up with Apple Maps.
Travel Sample entries -
A Home tab for the rest of life
Eleven trackers: heating, electricity, water, home upkeep, shopping, waste, digital use, entertainment, sport, pet care and healthcare. Each shows its last 7 days, and the week card compares them with the 7 days before.
These trackers use simpler averages than food and travel. Each entry is counted once in your daily total.
Home Sample entries -
Countries compared
Fossil CO₂ emissions per person in 32 countries, with the 2-tonne target drawn across them.
The figures count fossil CO₂ emitted inside each country in 2024, divided by its population: not everything its people consume.
Countries compared Data: Our World in Data, Global Carbon Project (CC BY 4.0) -
A climate library
Short explainers on climate science, energy, food, transport, policy and solutions, most with links to their sources.
The explainers summarise published sources; follow the links for the full studies.
Climate library -
Progress you can look back on
History lists every entry, newest first. Awards, streaks and eco-points mark the days you logged.
Nothing compares you with other users.
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44 languages
Choose the app's language in Settings.
In Basque, Galician, Irish and Welsh, some screens are still in English.
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Easy to read
Text follows your device's text size, and the screens and charts work with VoiceOver.
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No account, no ads
There is no sign-in. Your entries are stored on your device.
New in 1.2
iPhone, iPad, iPhone Duo and Apple Watch
The layout follows the screen: two columns and a sidebar where there is room, the phone layout where there is not.
iPhone Duo
Two columns on the inner display, the phone layout on the cover display, and your place is kept when you open or close it.
Apple Watch
Today's total against your goal, your last 7 days and your yearly estimate on your wrist. Log a trip with the Digital Crown, and your iPhone saves it.
The Watch app needs Decarbonr on your iPhone, and logging a trip needs a Decarbonr subscription there. If your iPhone is out of reach, the trip waits until it is back.
Entries are not synced between devices: your iPhone and your iPad each keep their own.
A look at the app
Screens from Decarbonr 1.2, with sample entries.
Today Sample entries Food Sample entries A barcode result Sample entries Product data: Open Food Facts contributors (ODbL) Travel Sample entries Home Sample entries 
History Sample entries Countries compared Data: Our World in Data, Global Carbon Project (CC BY 4.0) Climate library
Subscriptions
Two plans
Decarbonr needs a subscription after the introduction screens. Apple handles the payment, and the App Store shows the price in your currency.
Base Access
Premium Access plans: weekly, monthly or yearly
- Food, travel and 11 home and lifestyle trackers
- The dashboard, Insights and the yearly estimate
- The Apple Watch app
- The climate library and country comparisons
The weekly plan has a no-cost trial where offered; the paywall shows its length and the price after it.
AI add-on
AI Features plans: weekly, monthly or yearly
- Everything in Base Access
- Scan a meal from a photo
- Scan packaged food by barcode
- Up to 25 meal photos and 100 barcodes a day
Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel them in your Apple Account settings or in the app's Settings, which also has Restore Purchases.
Privacy
No account. No ads.
Your entries are stored on your device. Three things use the network, and only when you use them:
- A meal photo, only when you scan a meal and agree. It goes through Decarbonr's server, which passes it to OpenAI for analysis without storing it. You can turn this off in Settings.
- A barcode number, looked up on Open Food Facts.
- A city name that is not in the app's built-in list, looked up with Apple Maps.
- No analytics, no advertising and no third-party SDKs in the app.
Common questions
Is Decarbonr free?
No. Decarbonr needs a subscription after the introduction screens: Base Access, or the AI add-on, which includes Base Access and adds meal-photo and barcode scanning. The weekly Base Access plan has a no-cost trial where offered.
How exact are the numbers?
They are estimates, not measurements. Food and travel use emission factors from published sources, listed in the app under Sources and methods; the home and lifestyle trackers use simpler averages; meal-photo results are AI estimates.
Do I need an account?
No. There is no sign-in. Your entries are stored on your device and are not synced to iCloud or between your devices.
Which devices does Decarbonr run on?
iPhone and iPad with iOS 18 or iPadOS 18 or later, including iPhone Duo, and Apple Watch with watchOS 11 or later. The Watch app needs Decarbonr on your iPhone.
Start with today
Log one meal or one trip, and see where your day stands.
Version 1.2 is on its way to the App Store
This page shows Decarbonr 1.2. Until Apple releases it, the App Store has version 1.1, which has no iPad layout, Apple Watch app, Home tab or Insights.