Black Hole Imager
See a spinning black hole as it would really look: every pixel is a light ray traced through the Kerr spacetime, with frame dragging, Doppler and gravitational shifts, an accretion disk and your own 3D objects.
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Finance Dashboard
Track recurring income and expenses, one-time and irregular payments, loans and debts – with live charts and JSON backup.
Runs in your browser – nothing to install.
About this tool
A private dashboard for your personal finances. Enter recurring income and expenses (with day, category and period), one-time payments, irregular bills such as yearly insurance, and your loans and debts with balance, interest rate and minimum payment.
The overview shows monthly income, expenses, net cashflow, debt payments and what is left over, plus charts for income vs. expenses and net cashflow over 12 months, an expense breakdown by category, debt balances and upcoming payments. Step through the months and switch between actual cash flow and a smoothed view that spreads irregular costs.
Not sure where to start? Load the sample data and explore every feature.
Your data is only held in this browser tab – nothing is sent to a server. Download it as a JSON backup and import it again next time.
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