Gaussian Beam Explorer
Physics · Optics
Visualise how a Gaussian laser beam propagates. Adjust wavelength, beam waist and distance — beam profile, cross-section and intensity map update live.
Open appExplore science and finance — hands-on
TellMeWell hosts a growing collection of free, browser-based interactive tools. Each app runs as a self-contained service and opens directly in your browser — no installation needed.
Available apps
Loan Calculator
Finance
Calculate monthly payments, total interest and the full amortisation schedule for any fixed-rate loan. Interactive charts show the principal/interest split.
Open appWorld Trip Planner
Travel · Geography
Plan your world trip on an interactive map. Click any country for the best travel season and a Wikipedia overview, then build your full itinerary.
Open appHydrogen Orbitals
Physics · Quantum mechanics
Plot hydrogen atom probability densities in 3D and 2D. Choose any principal, azimuthal and magnetic quantum numbers n, l, m.
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All apps are completely free. If they saved you time or sparked your curiosity, a coffee tip helps keep the lights on — thank you!