Portseido
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Portseido specializes in modeling the two paths that appeal to FIRE enthusiasts most: stopping contributions but letting investments grow (Coast FIRE), or retiring completely. The tool displays scenarios side-by-side so you'll see how delaying your full retirement while coasting affects your timeline. Charts and tables make it easy to spot the inflection points where your money takes over.
It's built for people weighing the trade-off between freedom and a few more years of compounding. If you're not ready to commit to a retirement date but want to see when you actually could stop working, this tool cuts through the spreadsheet work. The comparison view is particularly strong for testing whether working five more years changes everything.