Comparison

ClearFast vs Sundial

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ClearFast

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Most fasting apps today are bloated with social feeds, AI coaches, mandatory account creation, and intrusive data tracking. ClearFast is different. Built for minimalists and anyone who values their privacy, ClearFast is a beautifully designed, high-contrast utility that does exactly one thing: tracks your fast flawlessly. No friction. No clutter. Just open the app and tap start. RADICAL PRIVACY Your health data is yours. ClearFast operates 100% offline. We do not require an email, we do not use third-party analytics SDKs, and your data never leaves your device. If you delete the app, your data is gone forever. CORE FEATURES (100% Free) • Unrestricted Protocols: Track 16:8, 18:6, OMAD (23:1). • Butter-Smooth UI: A 60fps dark-mode timer built to look beautiful in a pitch-black room at 5 AM. • Local Notifications: Reliable end-of-fast reminders that don't rely on cloud servers. • Edit Start Times: Forgot to start your timer after dinner? Easily adjust your start time retroactively. • 7-Day History: View your current streak and rolling 7-day average. • Eating window countdown after you end a fast, so you know when the next one begins. • Meal notes: jot down what you broke your fast with. Optional, never nagged about. • Home Screen widget (live timer data inside it is a Premium feature). CLEARFAST PREMIUM (Optional) If you love the app and want to support an independent developer, ClearFast PREMIUM is for people who want the long-term record and the system integrations. Buy it once, or subscribe to it monthly, your call. • Unlimited Fasting History: Keep your data and view your long-term consistency. • Premium Aesthetics: Unlock custom accent colors to replace the default Teal. • Unlock Custom Plan: Set a custom fasting plan. • Custom Reminder Notification: Set multiple random time intervals to get a reminder notification (eg:-get reminder notification every 10min and 30min interval). • Compliance calendar: a year of fasting at a glance. • 30-day and all-time trend charts, filterable by completed versus ended early. • CSV and PDF export, meal notes included. • Custom fasting length, anywhere from 1 to 48 hours. • Weekly schedule: different targets on different days. • eating-window reminder notifications. • Live Activity on the Lock Screen and Dynamic Island, and live data in the Home Screen widget. • Custom alternate app icons. Experience fasting, simplified. Website:- https://www.useclearfast.com Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Sundial

Features
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Finally, a fasting timer you buy once and own for life. No subscription. No account. No quiz-funnel paywall. Just open it and start your fast. Sundial is a calm, local-first tracker for intermittent fasting and OMAD (one meal a day). One quiet ring; a sun crosses the dial as your fast deepens. Warm paper-and-ember design, automatic dark mode. No neon, no confetti, no streak-shaming. It works fully offline from the very first tap. WHY SUNDIAL IS DIFFERENT - Pay once, $19.99. No $60-80/year renewals for a glorified timer. - No forced sign-up, no quiz funnel, no data siphoning. Cloud backup is optional, never required. - Fasting zones and stages are explained for free - learn what each stage is called, hour by hour. Most apps lock this away. - Custom durations up to 72 hours - log any fast you choose, with no upsell. - Retroactive editing: forgot to hit start or stop? Fix it, or log a past fast. - Your eating window anchors to when you actually broke the fast - not a rigid schedule. FREE FOREVER - Timer for every protocol: 16:8, 18:6, 20:4, OMAD, 36h, and custom. - Fasting zones and stage labels on the dial. - History, calendar, streaks, and weekly stats. - Weight, water, and mood logging. - Gentle notifications for start, end, and milestones. - Export everything to CSV or JSON in two taps. Your data is yours. LIFETIME UNLOCK ($19.99, ONCE) - Cloud backup and cross-device sync. - Insights: deeper trends over time. - The full Field Notes library of calm, readable articles - including a plain explainer of what autophagy is. Everything you need to fast is already free. Lifetime is for going further, on your terms. BUILT TO RESPECT YOU Local-first and private by design. No ads, no data mining, no guilt loops, no upsell screens between you and your timer. A quieter way to keep time. Sundial tracks time. It is not medical advice. Talk to a healthcare professional before changing how you eat or starting extended fasts, especially if you are under 18, pregnant, managing diabetes, or have a history of disordered eating.

Screenshots

ClearFast4 screens
Sundial4 screens

Verdict

The call

ClearFast and Sundial are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ClearFast sells 2 in-app purchases, starting at $1.99 per month and Sundial sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ScorecardNo meaningful differences
ClearFast versus Sundial: the parameters behind the verdict, then further details
ParameterClearFastSundial
PriceFreeFree
Update frequencyEvery 4 months—
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPod — betteriPhone
Requires iOS15.1 — better16.4
Further details — not scored
Size40 MB65 MB
Age rating4+4+
DeveloperJanardan AyachiVitalii Iudin

In-app purchases

2 purchases

ClearFast

Subscriptions1
  • ClearFast Premium Monthly$1.991 Month
One-time1
  • ClearFast Lifetime$19.99
1 purchases

Sundial

One-time1
  • Sundial Lifetime$19.99

Questions

Is ClearFast free?
ClearFast is free to download, with in-app purchases available.
Is Sundial free?
Sundial is free to download, with in-app purchases available.
Do ClearFast or Sundial have ads?
Neither ClearFast nor Sundial shows ads.

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