Comparison

H2 flow water fasting vs Sunwick

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

Head to head
About

H2 flow water fasting

This app guides users through water fasting with hydration tracking and mindful prompts. It offers science-based tools to support metabolic renewal and help users achieve fasting goals, from short to multi-day protocols.

Highlights
  • Hydration tracking
  • Mindful guidance
  • Science-based tools
  • Fasting preparation
  • Milestone celebration
  • Metabolic renewal support
Read full description

Unlock the full potential of water fasting with H₂flow — designed with insights from experienced fasting practitioners to help you prepare, stay mindful, and celebrate every milestone. Whether you’re completing your first 24-hour fast or optimizing multi-day protocols, H₂flow supports your journey with hydration tracking, mindful guidance, and science-based tools for metabolic renewal. Important Disclaimer: H₂flow is intended for informational and wellness purposes only. It does not provide medical advice and is not a substitute for professional medical consultation, diagnosis, or treatment. Always seek the advice of your physician or another qualified healthcare provider before starting any fasting program, making dietary changes, or making decisions related to your health. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Sunwick

Features
Read full description

Sunwick is a fasting timer for 16:8, OMAD and 72-hour fasts. The timer, every plan, your Home Screen and Lock Screen widgets and your full history are free, forever. Your little flame buddy glows brighter the longer you fast. No account. No ads. Close the paywall and keep going. FAST YOUR WAY • Plans from 12:12, 14:10 and 16:8 to 18:6, 20:4, OMAD (23:1) and 5:2 • Longer fasts: 24, 36, 48 and 72 hours, 5 days and 7 days • Or set your own length • Started earlier? Backdate it. Ate early? Edit the end. Or pick an end time instead of a length. SEE WHERE YOU ARE • A ring that shows your fast and the stage you're in, from digesting and blood sugar settling to switching fuel, ketones rising and beyond • Each stage has an evidence label (established, likely or emerging) and sources you can read • Stage timings are typical averages from research, not measurements of your body ON YOUR LOCK SCREEN AND HOME SCREEN • Live Activity and Dynamic Island while you fast, and while your eating window is open • Small and Medium Home Screen widgets, plus Lock Screen widgets • Controls for Control Center, the Lock Screen and the Action button • Siri and Shortcuts: "Start a fast in Sunwick", "How long have I fasted in Sunwick" • Reminders for your usual start time, the last hour, your goal and each new stage. Act right from the notification: start now, +1 hour, finish or log your weight. YOUR HISTORY, ALL OF IT • Every fast on a calendar, with weekly charts and totals • Streaks with freezes, so one off day doesn't wipe your progress • Badges for milestones • Weight and mood log • Export everything as CSV, or delete it all, any time HELP WHEN IT GETS HARD • Craving SOS: a one-minute breathing break when hunger hits, with no guilt if you decide to eat • Check-ins on long fasts, plus electrolyte and gentle refeed tips • A Learn library of short reads on fasting, sleep, nutrition and more OPTIONAL EATING WINDOW LOG • Off until you turn it on • Log meals by barcode, typing, a nutrition label photo or a meal photo estimate • See how much protein is left for your window • You check and edit every entry before it's saved A BUDDY, NOT A NAG • Name your flame buddy and pick an accessory • It reacts to your fast and cheers when you reach your goal • No "you failed" messages. Ever. SUNWICK PLUS (OPTIONAL) Everything above stays free. Plus adds: • Your weight trend insight: how your 16h+ fasting days line up with your weight • The Large Home Screen widget • 18 extra Learn articles • Up to 40 meal photo estimates a day (the free plan includes 3 a week) Sunwick Plus is an auto-renewing subscription. Prices and any free trial are shown in the app before you buy. Payment is charged to your Apple Account when you confirm the purchase, or when a free trial ends. The subscription renews automatically unless you cancel at least 24 hours before the end of the current period. Manage or cancel any time in Settings > [your name] > Subscriptions. SAFETY FIRST Sunwick gives general information, not medical advice. It isn't for anyone under 18, anyone pregnant or breastfeeding, or anyone with a history of eating disorders or type 1 diabetes. Talk to a doctor before fasting longer than 24 hours, or if you have a medical condition or take medication. If you feel unwell, eat. Terms of Use: https://sunwick-app.pages.dev/terms Privacy Policy: https://sunwick-app.pages.dev/privacy

Screenshots

H2 flow water fasting4 screens
Sunwick4 screens

Verdict

The call

The clearest difference is ads: H2 flow water fasting at none against Sunwick's shown. H2 flow water fasting also leads on iOS requirement (16.4 vs 18.4). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. H2 flow water fasting sells 2 in-app purchases, starting at $2.99 per month and Sunwick sells 2 in-app purchases, starting at $5.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

H2 flow water fasting ships an update monthly, Sunwick every 5 weeks. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

Scorecard2 real differences · 8 level
H2 flow water fasting versus Sunwick: the parameters behind the verdict, then further details
ParameterH2 flow water fastingSunwick
PriceFreeFree
Rating3.4 (5 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings5 — better—
Update frequencyMonthly — betterEvery 5 weeks
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree—
DevicesiPhone, iPad — betteriPhone
Requires iOS16.4 — better18.4
Further details — not scored
Size57 MB40 MB
Age rating17+17+
DeveloperMartijn NelissenDansUGC LLC

In-app purchases

2 purchases

H2 flow water fasting

Subscriptions2
  • H2Flow Pro Monthly$2.991 Month
  • H2Flow Pro Yearly$24.991 Year
2 purchases

Sunwick

Subscriptions2
  • Weekly Subscription.$5.997 Days
  • Yearly Subscription.$49.991 Year

Questions

Is H2 flow water fasting free?
H2 flow water fasting is free to download, with in-app purchases available.
Is Sunwick free?
Sunwick is free to download, with in-app purchases available.
Do H2 flow water fasting or Sunwick have ads?
Sunwick shows ads; H2 flow water fasting does not.
Which is updated more often, H2 flow water fasting or Sunwick?
H2 flow water fasting ships an update monthly, and Sunwick every 5 weeks. Most recently, H2 flow water fasting was updated on October 24, 2026 and Sunwick on October 28, 2026.

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