Ninety Days vs Stellar Flow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Ninety Days
Build positive habits and break bad routines with motivating challenges and detailed progress insights. Track your consistency with streak analysis and earn rewards for completed goals. Offers both free and premium versions for deeper insights.
- 30, 60, & 90-day habit challenges
- Detailed progress statistics
- Streak tracking and analysis
- Daily and overall habit overview
- Earn badges and rewards
- Flexible custom tracking
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With Ninety Days, you can build positive new habits and leave bad routines behind. Track your habits for 30, 60, and 90 days — and beyond. Milestones guide you along the way. Use workouts and activities from Apple Health to automatically track supported habits. Once your defined minimum target is reached, the habit is logged automatically. Detailed progress insights such as the Baseline Model help you stay consistent. ------------------- What Ninety Days offers • Flexible habit tracking Track your habits quickly and easily — in a way that fits your personal routine. • Track quantities and baselines Set a personal baseline (minimum target) for quantity-based habits and track the amount you actually achieve each day. • Auto Log with Apple Health Let Apple Health automatically track supported habits — without having to log them manually every day. Currently supported are selected workout types as well as steps and flights climbed from Apple Health. Once the defined minimum target (baseline) is reached, the habit is logged automatically. • Track your progress over time Follow your quantities, streaks, and routines and see how your habits develop over time. • 30-, 60- & 90-day challenges Take on built-in challenges and guide your habits through multiple challenge levels. • Statistics & Insights Keep an eye on your current progress and get detailed insights into your habits and streaks. • Baseline Model Compare the quantities you actually achieve over time with your personal baseline and identify long-term trends. • Badges & Achievements Earn awards for consistent routines and successfully completed challenges. ------------------- Habits are not built through repetition alone. What matters is making them realistic and measurable, tracking them consistently, and making their progress visible over time. Ninety Days combines habit tracking with quantity tracking, personal baselines, challenges, and long-term analysis. This lets you not only record whether you completed a habit, but also understand how consistently you follow it and how it develops over time. ------------------- Free Version: • Log up to 3 habits per day • Track quantity-based habits • Start 1 challenge at a time (Level 1 · 30 days) • Access the statistics dashboard • Daily overview of your logging behavior • Earn achievements • Full access to all settings ------------------- Premium: • Create and log unlimited habits • Baseline Model for quantity-based habits • Auto Log with Apple Health for supported workouts and activities • Start multiple challenges at the same time • All Statistics and Insights • Advanced streak analysis ------------------- You can switch between Premium and the Free Version at any time. Premium subscription options: • Annual subscription • Monthly subscription The subscription renews automatically unless canceled at least 24 hours before the end of the current subscription period in the Apple App Store. This applies to both monthly and annual subscriptions. ------------------- Make your progress visible and build habits that last — with Ninety Days. ------------------- Privacy Policy: https://ninety-days.app/privacy Terms of Use: https://ninety-days.app/terms
Stellar Flow
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Deep focus in deep space. With Stellar Flow, every focus session becomes an interstellar voyage to distant planets, where you'll collect resources, upgrade your ship, and chart your path through an infinite universe. EXPLORE THE GALAXY Pilot your personal starship through star systems, from the familiar Sol to distant uncharted systems. The further you travel, the greater the treasures you'll discover. Select your destination on the stunning 3D galaxy map and set your course. FOCUS SESSIONS THAT REWARD YOU Choose your mission type—Focus, Work, Meditate, Read, or Exercise—and set your journey duration. As you focus, watch your ship soar through the cosmos in a mesmerizing cockpit view. Complete your journey to land on your destination planet and collect your reward. BUILD YOUR STARSHIP Earn Credits from your voyages. Improve your ship. Every focus session brings you closer to your next upgrade. IMMERSIVE SOUNDSCAPES Let ambient space music carry you through your focus sessions. Handcrafted soundscapes designed for deep concentration—the perfect companion for work, study, or meditation. Toggle music on or off to match your preference. CAPTAIN'S LOG Track your progress with beautiful statistics and a calendar view. Monitor your focus streaks, total journey time, and completed missions. Review your journey history and celebrate how far you've traveled. DELIGHTFUL DETAILS Live Activities — See your timer on your Lock Screen and Dynamic Island Name Your Ship — Make it truly yours with a custom name Background Audio — Music continues even when your screen is locked WHY STELLAR FLOW? Ordinary timers tick. Stellar Flow transports. We built the focus app we wished existed—one that makes productivity feel like play. Where completing a 25-minute work session doesn't just feel good, it feels like landing on Mars. Where building focus habits isn't a chore, it's an adventure. Whether you're studying for exams, working through a project, or building a meditation practice, Stellar Flow turns the grind into a space journey. Ready to launch? Your ship is waiting. Your galaxy is calling. Download Stellar Flow and begin your journey today.
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Verdict
The clearest difference is in-app purchases: Stellar Flow at none against Ninety Days's 2. Stellar Flow also leads on update cadence (every 3 days vs weekly) and iOS requirement (18.0 vs 26.0). Ninety Days's advantage is ads (none vs shown). On price 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. Ninety Days sells 2 in-app purchases, starting at $4.99 per month. Stellar Flow asks for nothing beyond the download.
Ninety Days ships an update weekly, Stellar Flow every 3 days. The most recent releases landed on October 10, 2026 and October 9, 2026 respectively.
| Parameter | Ninety Days | Stellar Flow |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Weekly | Every 3 days — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 26.0 | 18.0 — better |
| Further details — not scored | ||
| Size | 30 MB | 45 MB |
| Age rating | 12+ | 4+ |
| Developer | Andreas Stein | Alexander Heemann |
In-app purchases
Ninety Days
- Monthly Plan – cancel anytime$4.991 Month
- Premium – 1 Year Ninety Days7 Days trial$29.991 Year
Stellar Flow
No in-app purchases
Questions
Is Ninety Days free?
Is Stellar Flow free?
Do Ninety Days or Stellar Flow have ads?
Which is updated more often, Ninety Days or Stellar Flow?
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