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Savings Challenge Builder
Most savings challenges are a fixed printable grid someone drew once. This one is generated: give it a target, a timeframe and a shape, and every row derives from those three.
Pick the challenge type, the amount you are aiming at, the start date and how the amounts should escalate. The grid rebuilds itself and there is nothing to edit in it. Tick Done as you pay each period in, and Progress projects your finish date from the pace you have actually kept rather than the one you planned.
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GENERATED GRID
Three shapes, and the third one is the interesting one. Flat is the same amount every period. Linear starts small and ramps, and still sums to your target rather than to a number the ramp happens to reach. Random varies unpredictably around the average, which some people find easier to stick to, and the variation is fixed per period rather than re-rolled every time you open the file. A challenge that quietly changes its own numbers behind you is not a challenge.
Pairs with

