# LockIn30

> LockIn30 is a 30-day challenge app for iOS and Android: pick one habit, log it daily, and follow streaks, stats and photo timelapses. This site has free challenge trackers, habit calculators and guides.

Get the LockIn30 app: [App Store](https://apps.apple.com/app/id6770272031?pt=120576754&ct=lockin30.llms&mt=8) · [Google Play](https://play.google.com/store/apps/details?id=com.ehmtech.lock&referrer=utm_source%3Dlockin30.llms)

Every page on this site has a Markdown copy: replace the trailing slash in its URL with .md (the homepage is /index.md).

## Tools

- [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.
- [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.
- [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 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.
- [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 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.
- [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.
- [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.
- [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.
- [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.
- [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.
- [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.

## Comparisons

- [Best 30 Day Challenge Apps for Beginners in 2026](https://lockin30.com/compare/best-30-day-challenge-apps/): We compared 7 apps for running a 30 day challenge on ratings, price, run length and missed-day rules. Each one fits a different kind of run.
- [LockIn30 vs Me+ Lifestyle Routine](https://lockin30.com/compare/lockin30-vs-me-lifestyle-routine/): Me+ Lifestyle Routine is an open-ended daily routine and habit planner. See how it compares with LockIn30 on challenge length, photos, and price.
- [LockIn30 vs Habit Tracker by Inner Grow Limited](https://lockin30.com/compare/lockin30-vs-habit-tracker/): Habit Tracker by Inner Grow Limited is a daily planner for building and quitting habits. See how it compares with LockIn30 on challenge length and price.
- [LockIn30 vs Productive - Habit Tracker](https://lockin30.com/compare/lockin30-vs-productive-habit-tracker/): Productive - Habit Tracker runs a whole daily routine, with a habit cap on the free tier. See how it compares with LockIn30 on price and structure.
- [LockIn30 vs Fabulous: Daily Habit Tracker](https://lockin30.com/compare/lockin30-vs-fabulous-daily-habit-tracker/): Fabulous: Daily Habit Tracker is a routine planner with coaching and guided journeys. See how it compares with LockIn30 on price, photos, and privacy.
- [LockIn30 vs 30 Day Fitness - Home Workout](https://lockin30.com/compare/lockin30-vs-30-day-fitness-home-workout/): 30 Day Fitness - Home Workout is a guided 30-day home workout plan. See how it compares with LockIn30 on price, habit choice, and streaks.
- [LockIn30 vs 30 Day Fitness at Home](https://lockin30.com/compare/lockin30-vs-30-day-fitness-at-home/): 30 Day Fitness at Home is a guided 30-day workout plan. See how it compares with LockIn30 on habit choice, plan length, photos and price.

## About

- [About LockIn30](https://lockin30.com/about/): Who makes LockIn30, and the sources its tools and guides use
- [Contact LockIn30 support](https://lockin30.com/contact/): How to email support, and what to include

## Optional

- [Track a Habit You Do Multiple Times a Day](https://lockin30.com/blog/track-a-habit-done-multiple-times-a-day/): Water, stretching and pills happen all day, not once. How to collapse a multi-rep habit into one honest daily rule, and when counting reps earns its keep.
- [The Two-Day Rule for Habits: Never Skip Twice](https://lockin30.com/blog/two-day-rule-habits/): The two-day rule says never skip a habit twice in a row. What the research supports, where the rule breaks, and how to run it inside a 30-day challenge.
- [Offline Habit Tracker, No Account: What to Look For](https://lockin30.com/blog/offline-habit-tracker-no-account/): How to tell a real local-only habit tracker from a cloud app with an offline cache, verify the claim yourself in five minutes, and handle the backup problem.
- [30-Day Digital Detox Challenge: Pick One Rule](https://lockin30.com/blog/30-day-digital-detox-challenge/): Most 30-day digital detox plans hand you 30 different tasks. Pick one yes-or-no phone rule instead, hold it for the whole month, and log it once a day.
- [How to Keep a Habit Streak While Traveling](https://lockin30.com/blog/how-to-keep-a-habit-streak-while-traveling/): Travel kills streaks by deleting the cues that fire them. Here is the pre-trip protocol: your travel minimum, an if-then plan, and the time-zone trap.
- [Why Week 3 of a Habit Challenge Feels Flat](https://lockin30.com/blog/habit-challenge-week-3-motivation-dip/): Week 3 is when motivation bottoms out in a 30-day challenge. Here is the research behind the dip, why boredom is not failure, and what to change safely.
- [When to Start a 30-Day Challenge (Not Jan 1)](https://lockin30.com/blog/when-to-start-a-30-day-challenge/): The fresh-start effect is real, but it only helps you begin. How to pick a start date around the calendar you have, and where day 30 should land.
- [How Long Should a Challenge Be: 7-90 Days](https://lockin30.com/blog/how-long-should-a-challenge-be/): 7, 30, 60 or 90 days? Each length does a different job. A research-backed way to pick your challenge duration before day 1, not defend one after.
- [First Week of a 30-Day Challenge, Day by Day](https://lockin30.com/blog/first-week-of-a-30-day-challenge/): Week one is where a 30-day challenge gets decided, not where it dies. A day-by-day plan for days 1 to 7, plus what to change at the day 7 checkpoint.
- [What to Do When You Break a Habit Streak](https://lockin30.com/blog/what-to-do-when-you-break-a-habit-streak/): Broke your streak? The missed day is not the failure, the next 24 hours are. A triage protocol for the lapse, the shame spiral, and never missing twice.
- [75 Hard Alternatives: The One You'll Finish](https://lockin30.com/blog/75-hard-alternatives-single-habit-challenge/): Every 75 Hard alternative ranked by the odds you actually finish it, not by how gentle it sounds. 75 Soft, 75 Medium, Operation 66 and the single-habit run.
- [Should You Reward Yourself for a Habit Streak?](https://lockin30.com/blog/rewards-for-habit-streaks/): Rewards help or hurt a habit streak depending on the type. What the research says about tangible prizes, feedback, temptation bundling, and reward timing.
- [How to Define a Habit You Can Track Daily](https://lockin30.com/blog/how-to-define-a-trackable-habit/): Vague goals are untrackable by design. Use the two-observer test, a rewrite table, and six measurement types to define a habit you can log daily.
- [30-Day Walking Challenge: What to Expect](https://lockin30.com/blog/30-day-walking-challenge-what-to-expect/): A week-by-week look at what a 30-day walking challenge actually feels like, what really changes by day 30, and why days 10 to 20 are the hard part.
- [Realistic 30-Day Challenge Completion Rate (Benchmarks)](https://lockin30.com/blog/realistic-30-day-challenge-completion-rate/): What completion rate should you expect from a 30-day challenge? Real adherence data, a day-by-day benchmark table, and why 100 percent is the wrong target.
- [Weekly Habits vs Daily Habits: What to Track](https://lockin30.com/blog/weekly-habits-vs-daily-habits/): Weekly quotas look flexible and quietly erode. When a daily cadence wins, when a weekly total is honest, and how to log a 3x-a-week goal daily.
- [Best Time of Day to Log a Habit (Not Bedtime)](https://lockin30.com/blog/best-time-of-day-to-log-a-habit/): The best time to log a habit is the second you finish it, not at bedtime. What diary research says about batch-logging, backfills and reminder timing.
- [How to Restart a Challenge Without Starting From Zero](https://lockin30.com/blog/restart-challenge-without-starting-from-zero/): Missed a day of your 30-day challenge? A two-question rule tells a one-off disruption from real drift, so you can resume or restart without losing progress.
- [Day 31: What to Do After a 30-Day Challenge](https://lockin30.com/blog/what-to-do-after-a-30-day-challenge-ends/): Day 30 is a checkpoint, not a finish line. The three honest exits after a 30-day challenge, what the habit research says, and how to decide before day 1.
- [How to Take Consistent Progress Photos for a Timelapse](https://lockin30.com/blog/consistent-progress-photos-30-day-timelapse/): Same time, same light, same mark on the floor. A repeatable setup for daily progress photos so your 30-day timelapse plays smooth instead of jittery.
- [Strict vs Forgiving Habit Tracking: Which Wins?](https://lockin30.com/blog/strict-vs-forgiving-habit-tracking/): Strict streaks or forgiving skips? What habit research actually says about missed days, the setback effect, and how to pick the mode that fits your challenge.