PhaseKit

Knowledge at hand.Work on record.

PhaseKit is an open toolbox for refrigeration work and learning. Look up refrigerant data, run calculations and write reports on site — on your phone, tablet or computer. Share a finished report as a PDF or print it.

Open PhaseKitTry the beta

In Finnish and English. Works offline too.

A commissioning report filled with example data in print preview
Refrigerant details in the mobile view
Screenshots show the PhaseKit interface in Finnish.

With data and calculations at hand, you can check the basis for a result and keep a record of the work.

See the formulas, sources and limits behind the result. Data gaps are made clear, and you can take your saved records with you.

From field observations to a finished report.

Group equipment by site and record the work:

  1. Group equipment by site

    Save sites and keep their equipment together.

  2. Start a report with equipment details

    Use saved equipment details as a starting point. Check visit-specific information, record observations and work through the checklist.

  3. Find records and share reports

    Find a unit’s reports and calculations together. Share a report as a PDF or print it on paper.

An example site and its saved equipment details
Example report in print preview
From site and equipment details to a completed report.

You don’t have to
remember everything.

Look up refrigerant data, check a calculation and understand its basis — with sources and formulas available to inspect.

A refrigerant reference library

Explore pure refrigerants and blends: composition, properties, safety classes, GWP values and restrictions. Search, compare and check the sources, with coverage and gaps clearly shown.

Explore in the app

Refrigeration, electricity and physics

Refrigeration cycles and P–T values, electrical calculations, heat quantity and thermal power, pipe calculations and unit conversions. Check the formulas and assumptions behind the result.

Explore in the app

Schematic symbols at hand

What does that symbol mean? Look up refrigeration and electrical symbols, with names and explanations, in the same tool.

Explore in the app

Reports and equipment records

Save sites and equipment, use equipment details as a starting point for reports, and find linked reports and calculations by unit. Export reports as PDFs or print them.

Explore in the app
A refrigeration cycle log(p)–h diagram in PhaseKit
See the refrigeration cycle on a log(p)–h diagram — without pen and paper.

If I build a better one, would you use it?

A refrigeration teacher was frustrated with a leak-check interval app. It did not support refrigerant blends. Samu, one of his students, asked whether he would use a better one if Samu built it. That was the start of PhaseKit.

One problem grew into a toolkit for everyday situations. A log(p)–h diagram when there is no pen or paper nearby. Refrigerant data and calculations to check. Reports recorded on the spot. And checklists to help while you are still learning the ropes.

Samu Hupli
Creator of PhaseKit
Leak-check assessment result and basis for a 25 kg R513A blend charge
Example: R513A, 25 kg. The blend’s HFO component determines the inspection interval.

Clear limits. Visible sources.

Openness is part of how the tool works: you can inspect its basis and take your own data with you.

Check the basis for the data

The app shows the coverage and gaps in its refrigerant data. Missing data does not mean zero.

Ready for offline use

After you first open the app online, it and its datasets are available offline too. Reports and calculations stay in that browser.

Your records stay on your device

PhaseKit requires no account and does not upload your reports to the cloud. Export a backup in Settings to move data to another browser. Site visit statistics are based on server requests.

Take PhaseKit with you

Open the stable version first, then add it to your phone’s Home Screen for quick access in the field.

Open PhaseKit

Choose a light or dark theme, or let the app follow your device setting.

iPhone or iPad
  1. Open Safari and go to phasekit.app.
  2. Open the Share menu. If it is not shown, tap More, then Share.
  3. Choose Add to Home Screen.
  4. Turn on Open as Web App if offered, then tap Add.
Guide: Apple
Android
  1. Open Chrome and go to phasekit.app.
  2. Open the menu and choose Add to Home screen or Install, if offered.
  3. Confirm by choosing Add or Install.
Guide: Google

Menu labels can vary by browser and device.

A practical tool.
Always improving.

PhaseKit grows from real needs. Its source code is open under the MIT licence. Changes and discussion are available on GitHub.

PhaseKit on GitHub
Stable release

0.4.1

Meet PhaseKit

  • A new introduction presents PhaseKit’s tools, reports and site and equipment workflows in Finnish and English.
  • The shareable page brings together the project’s story, principles of openness, Home Screen instructions and links to stable and beta.
  • The About PhaseKit link in Settings opens the introduction in the selected language.
View releases and changelog

Made by

Samu Hupli

Samu Hupli

I’m Samu. A dad, a curious learner and a dreamer. I like understanding how things work and building something genuinely useful. My background is in design and strategy, and I founded & Two Words. I also talk openly about mental health and wellbeing.

I started studying refrigeration in autumn 2026. What drew me in was the way it brings different sciences together with hands-on work. The pace has been intense, so I’ve been finding ways to help myself and my classmates learn. PhaseKit is one of them; course notes shared with everyone are another. I reckon that if I can’t explain something to someone else, I don’t properly understand it myself yet.

Openness, honesty and learning new things matter to me. I want people to understand how the tools I build work, question their assumptions and correct their mistakes. That’s why PhaseKit’s sources, formulas and code are there to inspect.

LinkedIn

Try it when the
next question comes.

Open PhaseKitTry the beta

The beta is a separate test version, with storage kept separate from the stable app.