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Questions, bugs, renovation ideas — email is the fastest way to a reply.

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Frequently asked questions

Does the app work offline?

Yes. All calculations run locally — no measurement data leaves your device. Internet is only needed for the bottom banner ad and the one-time in-app purchase.
Can I remove the ads?

Yes. A one-time in-app purchase removes the banner for life. No subscription, no auto-renewal — works after a reinstall too.
Is this a subscription?

No. Pay once, keep it forever. A subscription doesn't fit the one-off nature of a renovation.
Which calculators are included?

Tiles (floor / wall / room modes), paint, wallpaper, concrete and insulation. Defaults are regional: GBP, metric units and UK Building Regulations-oriented insulation references for UK users.
Can I export a shopping list?

Yes — in project mode. An aggregated material list across all calculators, in a single PDF you can take to the store or send to a contractor.
Which phones does it run on?

iPhone with iOS 16 or later, Android 7.0 (API 24) or later. The app is small and runs fine on older hardware.
Which languages are supported?

The app is available in several European languages.
Where does the U-value data come from?

λ values come from manufacturer datasheets (EPS 70 = 0.040, mineral rock wool = 0.035, PIR = 0.022). Required U-values vary by region — see the insulation FAQ with separate pages for Poland (WT 2021), Germany (GEG), UK (Building Regs), and the US (IECC 2021).