The language-learning app Drops gives you "free passes" which regenerate every 5 days of actual streak & get automatically applied if you miss a day. I think th

The language-learning app Drops gives you "free passes" which regenerate every 5 days of actual streak & get automatically applied if you miss a day. I think this is a really nice way to get a streak system to work if you are super focused on a big number; if you miss 1 day you are suddenly extra incentivized to not miss the next several days so you can regain your now-used-up free pass, and theres some flexibility added to the streak so life can interfere occasionally and you get to keep your large number.