FREE TOOLS · BY TWELVE DIGITAL
Tools that just work.
Focused web utilities — for solar yield, German tax & finance, and image angle measurement. Each one does a single job, loads instantly, and runs right in your browser.
Featured tools
Solar Simulator
solar.twelve-tools.com
Photovoltaic yield, powered by EU JRC PVGIS.
Configure your roof, tilt, azimuth, and location and see annual, monthly, and daily AC output instantly. Backed by the European Commission's reference irradiance dataset and useful for sizing a residential PV system before talking to an installer.
Open Solar Simulator →Rechenwerk
rechenwerk.twelve-tools.com
Free online calculators for German tax & finance.
Severance pay with Fünftelregelung, property transfer tax across all 16 federal states, garnishment limits per §850c ZPO, and tax progression from wage replacement. Four standalone calculators, each referencing the underlying §EStG / ZPO law.
Open Rechenwerk →Angle
angle.twelve-tools.com
Measure any angle on any image, right in your browser.
Drop or paste an image, place a draggable, resizable protractor, and read the angle between its two arms instantly. Add multiple protractors in distinct colors, switch between degrees, radians, and gradians, and export the annotated image as a PNG. Runs entirely in your browser — your image never leaves your device.
Open Angle →Why focused tools?
Every tool here does one job. We don't try to be a platform, a workspace, or an account-system. You arrive at a URL, the calculation or transformation happens, you leave with the result. No onboarding, no dashboard, no upsell.
That focus has consequences we like. The pages load fast because they ship almost nothing. They run in your browser so the data stays on your machine where the file processing makes that possible. They survive without our servers being up — open the page once, your laptop has the engine cached. And they age gracefully: a single-purpose tool gets sharper with each iteration instead of bloated with unrelated features.
Twelve Tools is the tools portal of Twelve Digital GmbH. We build small, focused web utilities from Munich — each one runs on its own subdomain with independent infrastructure.