Source: https://lockin30.com/tools/ LockIn30 is a 30-day challenge app for iOS and Android: pick one habit, log it daily, and follow streaks, stats and photo timelapses. Get the LockIn30 app: [App Store](https://apps.apple.com/app/id6770272031?pt=120576754&ct=lockin30.md&mt=8) · [Google Play](https://play.google.com/store/apps/details?id=com.ehmtech.lock&referrer=utm_source%3Dlockin30.md) # LockIn30 Tools Free habit and challenge calculators that run entirely in your browser. No signup, no email — just answers. ## General - [100-Day Challenge Tracker](https://lockin30.com/tools/100-day-challenge-tracker/): Free online 100-day challenge tracker. Pick one habit, tick off all 100 days on the grid, and watch your progress percentage. No signup, saves in your browser. - [100 Days of Code Tracker: Free #100DaysOfCode Grid](https://lockin30.com/tools/100-days-of-code-tracker/): Free #100DaysOfCode tracker. Tick off an hour of code a day across a 100-day grid, log it in public, and watch the grid fill in. No signup. - [21-Day Habit Challenge Tracker](https://lockin30.com/tools/21-day-habit-challenge-tracker/): Free online 21-day challenge tracker: one habit, a 21-day grid, and a progress percentage that updates as you tick days off. No signup, saves in your browser. - [30-Day Ab Challenge Tracker](https://lockin30.com/tools/30-day-ab-challenge-tracker/): Free 30-day ab challenge tracker with a day-by-day chart of crunches, dead bugs, bird dogs and planks, 8 rest days, and a grid that saves in your browser. - [30-Day Challenge End Date Calculator](https://lockin30.com/tools/30-day-challenge-end-date-calculator/): Put in your start date and how long you are running for. You get the finish date, the weekday it lands on, and the milestone dates in between. - [30-Day Declutter Challenge Tracker](https://lockin30.com/tools/30-day-declutter-challenge-tracker/): Free 30-day declutter challenge tracker with a printable zone-by-zone schedule, item targets and time boxes, plus a 30-day grid you tick off daily. - [30-Day Gratitude Challenge Tracker](https://lockin30.com/tools/30-day-gratitude-challenge-tracker/): Free online 30-day gratitude challenge tracker. Write three good things a day, check off the grid and watch your progress percentage. No signup, saves locally. - [30-Day Habit Challenge Tracker](https://lockin30.com/tools/30-day-habit-challenge-tracker/): Free online 30-day habit challenge tracker. Pick one habit, check off all 30 days on the grid, and watch your progress build. No signup, saves in your browser. - [30-Day No Alcohol Challenge Tracker](https://lockin30.com/tools/30-day-no-alcohol-challenge-tracker/): Free 30-day no alcohol challenge tracker. Tick off each alcohol-free day on the grid and watch your day count and progress percentage climb. No signup needed. - [30-Day No Sugar Challenge Tracker](https://lockin30.com/tools/30-day-no-sugar-challenge-tracker/): Free 30-day no sugar challenge tracker. Tick off four daily habits, fill the grid, and watch your progress percentage build. Saves in your browser. - [30-Day Plank Challenge Tracker](https://lockin30.com/tools/30-day-plank-challenge-tracker/): Free 30-day plank challenge tracker with the full hold schedule, 20 seconds to 5 minutes, four rest days, and a day grid you tick off. No signup needed. - [30-Day Squat Challenge Tracker](https://lockin30.com/tools/30-day-squat-challenge-tracker/): Free 30-day squat challenge tracker with the full rep chart, 50 squats up to 250, seven rest days, and a tick-off day grid. No signup, saves in your browser. - [30-Day Wall Sit Challenge Tracker](https://lockin30.com/tools/30-day-wall-sit-challenge-tracker/): Free 30-day wall sit challenge tracker. A day by day hold time chart that climbs from 20 seconds to two minutes, plus a 30-day grid you tick off. - [30-Day Workout Challenge Tracker](https://lockin30.com/tools/30-day-workout-challenge-tracker/): Free 30-day workout challenge tracker for any routine. Tick off 22 training days and 8 planned rest days on one grid. No signup, saves in your browser. - [52-Week Savings Challenge Tracker](https://lockin30.com/tools/52-week-savings-challenge-tracker/): Free 52-week savings challenge tracker. Set your first deposit and weekly step, tick off each week, and see your running total. Saves in your browser. - [75-Day Hard Challenge Tracker](https://lockin30.com/tools/75-day-hard-challenge-tracker/): Free 75-day hard challenge tracker. Tick off all five daily tasks, fill the grid, and watch your day count and completion percentage. Saves in your browser. - [75 Soft Challenge Tracker](https://lockin30.com/tools/75-soft-challenge-tracker/): Free 75 Soft challenge tracker. Tick the four daily rules, fill the 75-day grid, watch your progress percentage. Miss a day, keep going. Saves in your browser. - [Challenge Completion Rate Calculator](https://lockin30.com/tools/challenge-completion-rate-calculator/): Work out your completion rate from days done and days elapsed, then see your projected finish and how many days you can still miss and hit your target. - [30-Day Challenge Ideas Generator](https://lockin30.com/tools/challenge-idea-generator/): Filter by category, effort level and minutes a day, then draw one 30-day challenge with a plain-English daily rule, three alternates, and your finish date. - [Challenge Start Date Planner](https://lockin30.com/tools/challenge-start-date-planner/): Have a date to be ready by? Enter it with your challenge length to get the exact start date, days until you must start, and the longest run that fits. - [Daily Target Planner Calculator](https://lockin30.com/tools/daily-target-planner/): Enter a total and how many days you have. You get the number to hit each day, a weekly figure, rest-day adjustments, and a catch-up pace if you are behind. - [Dry January Money Saved Calculator](https://lockin30.com/tools/dry-january-money-saved-calculator/): Free Dry January money saved calculator. Enter drinks per week and cost per drink to see money saved, calories avoided, drinks skipped, and a yearly total. - [Habit Formation Timeline Calculator](https://lockin30.com/tools/habit-formation-timeline-calculator/): Estimate how many days until your habit runs on autopilot, based on the Lally UCL study median of 66 days and a realistic range either side. - [Habit Streak Calculator](https://lockin30.com/tools/habit-streak-calculator/): Enter your habit start date and the days you missed. Get your current streak, best streak, total days logged, and the date you hit your next milestone. - [No Spend Challenge Tracker](https://lockin30.com/tools/no-spend-challenge-tracker/): Free no spend challenge tracker: tick off each clean day on a 30-day grid and watch your progress percentage climb. No signup, saves in your browser. - [Progress Photo Timelapse Calculator](https://lockin30.com/tools/progress-photo-timelapse-calculator/): Work out how long your daily progress photo timelapse runs at any frame rate, how many days of photos a target length needs, and the frame rate that fits. - [Push-Up Challenge Plan Calculator](https://lockin30.com/tools/pushup-challenge-plan-calculator/): Enter your max push-ups and a daily target to get a day-by-day ramp with sets per day, rest days, weekly totals, and the day you hit 100 push-ups. - [Pages Per Day Calculator to Finish a Book](https://lockin30.com/tools/reading-pace-calculator/): Free pages per day calculator to finish a book. Enter pages, date and reading speed for your daily target, minutes a day, and a catch-up pace. - [Screen Time Reduction Calculator](https://lockin30.com/tools/screen-time-reduction-calculator/): Enter your current daily screen time and your target. Get a week-by-week taper, the hours you reclaim, and the date you hit the new limit. - [Streak Restart Date Calculator](https://lockin30.com/tools/streak-recovery-calculator/): Broke your streak? See the finish date and the real cost of restarting from Day 1 versus extending the end versus just carrying on.