01Recording
Month by month
Energy, water, waste and occupancy go in every month. District heating and green electricity depend on contracts with their own terms, and occupancy is recorded per month because every metric is calculated per guest.
climactra
Software for hotels: record consumption, calculate the CO₂ balance and certification status, export the evidence as PDF and Excel. Live at climactra.com.
2026Concept, development, operationTypeScript · Next.js · React · PostgreSQL · Prisma · Stripe · Docker
- Lines of TypeScript
- 89,135
- Data models
- 37
- Tests
- 606
- Criteria
- 405
Starting point
From meter reading to proof
A hotel that wants to prove its sustainability collects bills and meter readings, maintains emission factors and works through a separate list of criteria for each label. That makes four filing systems that know nothing of each other, and at the end of the year they have to produce a figure that someone can check. Climactra brings them together in one place.
The application
Four steps, one data model
02Accounting
Every figure can be recalculated
Every recorded consumption stores the emission factor it was calculated with. If a factor changes later, an old balance can still be recalculated, and the application shows where the new figure differs.
03Certification
One status per year and label
Four labels, 405 criteria in total, each with its own status per hotel. That there is exactly one current certificate per hotel, year and standard is enforced by a partial index in the database, not by a check in the code.
04Reporting
What comes out at the end
The output is the balance by Scope 1 to 3, a score and the status of each label, as PDF and Excel. Each document is attached to the criterion it applies to; alongside are the measures with their expected impact.
Calculation
Where a balance goes wrong
CO₂ from wood and pellets counts as climate-neutral and does not belong in the Scope 1 total; Climactra reports it separately. Electricity is always calculated twice, location-based and market-based, and a green electricity contract only counts for months it covers in full. Spending in euros is deflated to the base year before conversion, otherwise the balance rises with prices rather than with consumption.
Decisions
What is built this way on purpose
Anyone opening someone else’s hotel gets a 404, not a 403, so nobody can guess which hotels exist. The database throttles requests itself; a separate cache service would be a second service to run, and the traffic doesn’t justify it. For one label the official assessment basis is missing. There, Climactra doesn’t estimate a level but shows the criteria and leaves the level open.
Live for hotels, in German, Italian and English.