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Pick a challenge, choose your amounts and print a tracker on A4 or US Letter. Tick an envelope each time you stuff it. No sign-up, nothing to install, and it all runs in your browser.
Each box is an envelope. Pick one at random, put that amount aside in cash or in a savings account, and tick it off. Keep going until every box is ticked.
100 Envelopes is the quick, big one. 52 Weeks spreads it over a year. 1p a Day starts tiny and builds slowly. Start with whichever feels doable.
This page runs entirely in your browser. Nothing you choose is sent anywhere, and there's no tracking or analytics.