Hundred Day Challenge vs Two
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Hundred Day Challenge
This app helps you build lasting habits and achieve goals through consistent, small daily actions over 100 days. Track multiple challenges simultaneously, visualize your progress, and stay motivated with visual cues and milestone rewards.
- Multiple challenges at once
- Daily completion tracking
- Progress visualization
- Motivating main screen
- Icon selection per challenge
- Progress rewards
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What is the 100 Day Challenge? The 100 Day Challenge helps you work consistently toward your goals and build real habits. Instead of big leaps, it's about small, daily steps that add up over 100 days and bring lasting change. Key features: • Multiple challenges at once: Start and manage different 100-day challenges in parallel (e.g., reading, sports, learning, meditation). • Daily completion: Mark your progress with just one tap – “Today done” keeps your streak alive. • Visualization: See your progress at a glance: expanded view with 100 days, checked days in green with check marks. • Motivating main screen: Personal greeting, overview of all active challenges, progress indicators, and quick selection. • Icon selection per challenge: Choose a suitable icon for each challenge. • Progress rewards: Visualize milestones and stay in the flow. • Pro version (in-app purchase): Unlock all features, remove restrictions, and get additional personalization options. Why does it work? Because small, daily actions done consistently are more effective than sporadic motivation. 100 days is short enough to stick with and long enough to form real habits. Social accountability – use it to your advantage: Share the start of your challenge on social media or with friends. Post at the beginning and after important milestones – this creates gentle social pressure that motivates you to stick with it. Others know that you have started, and you don't want to break the streak. Privacy & Sync: All data is private and stored securely in your iCloud account. There are no central servers; your challenge data belongs only to you. Tips for maximum impact: • Choose clear, specific tasks (e.g., “read for 10 minutes” instead of “read more”). • Use multiple parallel challenges, but don't overload yourself – focus helps. • Check your streak regularly to avoid setbacks and maintain motivation. Upgrade to the full version: Unlock the full power: unlimited challenges and no restrictions on the number of days. Support & feedback: Do you have any ideas or need help? Write to us directly via the app or visit our support page (link in the app). Your feedback makes the challenge better.
Two
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Build habits that actually stick — without the all-or-nothing guilt. Most habit trackers punish a single slip: miss one day and your streak resets to zero, so you give up. 2-Day Rule is different. It's built on one simple, forgiving idea — the two-day rule: never miss twice. Miss a day? Your streak stays alive. It only breaks if you skip two days in a row. That small bit of grace is what keeps you going for the long run. HOW IT WORKS - Create the habits you want to build, each with its own color and icon. - Tap to mark a habit done each day. - Keep your streak alive by simply never missing two days back to back. FEATURES • Forgiving streaks — one missed day won't undo your progress • Current and longest streak tracking for every habit • Monthly goals so you can aim for a target number of days • Challenges — commit a habit to a fixed goal with a deadline • A clear progress calendar and stats to see how far you've come • Habit reminders so you never forget • Motivational nudges to keep your momentum going • Simple, distraction-free design CHALLENGES Ready to push further? Turn any habit into a time-boxed challenge. Pick a length — say 30 or 100 days — set a target number of completions, and give yourself a limited number of slip-ups. A completion ring, days remaining, and slip-ups left keep you honest, and every day you check the habit off counts automatically. When a challenge ends it moves to your history, sorted into completed and missed, so you can see everything you've taken on. WHY THE TWO-DAY RULE WORKS Consistency beats perfection. Missing once is human; missing twice is how a streak quietly dies. By drawing the line at two days, 2-Day Rule helps you stay consistent without the shame spiral that makes people quit. Whether you're building a workout routine, drinking more water, reading daily, meditating, or finally sticking to any goal — 2-Day Rule keeps you on track. 2-Day Rule is free to use, with an optional premium upgrade. Download 2-Day Rule and start your streak today. Just remember: never miss twice. Privacy policy: https://two-day-rule-web.vercel.app/privacy Terms of service: https://two-day-rule-web.vercel.app/terms
Screenshots
Verdict
The clearest difference is update cadence: Two at every 3 weeks against Hundred Day Challenge's every 9 months. Two also leads on iOS requirement (16.4 vs 18.5). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Hundred Day Challenge sells 1 one-off in-app purchase and Two sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.
Hundred Day Challenge ships an update every 9 months, Two every 3 weeks. The most recent releases landed on November 5, 2026 and October 28, 2026 respectively.
| Parameter | Hundred Day Challenge | Two |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 9 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.5 | 16.4 — better |
| Further details — not scored | ||
| Size | 2 MB | 83 MB |
| Age rating | 4+ | 4+ |
| Developer | Urs Jaeggi | Kristian Goshi |
In-app purchases
Hundred Day Challenge
- Full Version$0.99
Two
- Monthly subscription$0.991 Month
- Yearly subscription$5.991 Year
Questions
Is Hundred Day Challenge free?
Is Two free?
Do Hundred Day Challenge or Two have ads?
Which is updated more often, Hundred Day Challenge or Two?
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