Comparison

H2 flow water fasting vs Fasting Timer & Hydration Log

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

Fasting Timer & Hydration Log

Features
Read full description

An intermittent fasting timer that tells you exactly where you are: hours elapsed, hours left, and which metabolic stage your body just entered. Most fasting apps stop at a countdown. This one draws the whole fast on a stage timeline — fed state at 0h, glycogen use at 4h, fat burning at 8h, ketosis at 12h, autophagy at 16h, deep ketosis at 24h — so the number on screen finally means something. Underneath it sits a hydration log, because water is what makes the last four hours bearable, and a Learn library that answers the questions every beginner hits in week one. WHAT YOU GET - Know your fasting window at a glance: a live ring timer with hours elapsed, time remaining and the exact clock time your eating window opens - Follow your body, not just the clock — a metabolic stage timeline that fills in as you pass 4h, 8h, 12h, 16h and 24h - Start in two taps with 16:8, 18:6, 20:4 or OMAD 23:1, and get a completion notification the moment you hit your goal - Hit your water target every day — a 250 / 500 / 750 ml quick-add, a custom amount, an adjustable daily goal and a progress ring for today - See whether it is working: total fasts, average length, longest fast, a consecutive-day streak and a bar chart of your last ten fasts - Close each fast honestly — rate how it felt and your energy level from 1 to 5, then browse the full history of every fast you finished PERFECT FOR - Beginners starting 16:8 who want to know what is happening inside the fast, not just when it ends - OMAD and 20:4 fasters chasing longer ketosis and autophagy windows - Anyone who keeps forgetting to drink water once meals disappear from the day - People who quit fasting before because the hours felt pointless and invisible WHY NOT JUST USE A KITCHEN TIMER? A timer tells you 6:42 is left. It cannot tell you that you crossed into fat burning two hours ago, when your eating window opens tomorrow, how long your streak is, or whether last week's fasts were actually longer than this week's. That context is the difference between counting down and building a habit. PRIVACY Everything stays on your iPhone. No account, no sign-up, no servers — your fasts, water logs and notes are stored on the device and are never uploaded. FULL ACCESS This is a paid app: one plan unlocks everything — all four fasting protocols, the live timer and stage timeline, unlimited history, insights and charts, the hydration log and the full Learn library. Choose weekly, yearly, or a one-time lifetime purchase. No ads at any tier. This app is a fasting timer and hydration log for general wellness, not medical advice. Talk to a doctor before fasting, especially if you are pregnant, diabetic or managing a health condition. Pick 16:8, tap Start, and watch your first stage light up tonight. Terms of Use (EULA): https://web-levi.web.app/terms Privacy Policy: https://web-levi.web.app/privacy-policy Questions? tphuc.work@gmail.com

Screenshots

H2 flow water fasting4 screens
Fasting Timer & Hydration Log4 screens

Verdict

The call

The clearest difference is in-app purchases: Fasting Timer & Hydration Log at none against H2 flow water fasting's 2. On price, update cadence, ads 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. Fasting Timer & Hydration Log asks for nothing beyond the download.

UpkeepUpdate frequency

H2 flow water fasting ships an update monthly, Fasting Timer & Hydration Log every 5 weeks. The most recent releases landed on September 23, 2026 and September 21, 2026 respectively.

Scorecard1 real difference · 9 level
H2 flow water fasting versus Fasting Timer & Hydration Log: the parameters behind the verdict, then further details
ParameterH2 flow water fastingFasting Timer & Hydration Log
PriceFreeFree
Rating3.0 (4 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings4 — better—
Update frequencyMonthly — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree—
DevicesiPhone, iPad — betteriPhone
Requires iOS16.4 — better17.0
Further details — not scored
Size57 MB5 MB
Age rating17+4+
DeveloperMartijn NelissenPhuc Pham

In-app purchases

2 purchases

H2 flow water fasting

Subscriptions2
  • H2Flow Pro Monthly$2.991 Month
  • H2Flow Pro Yearly$24.991 Year
None

Fasting Timer & Hydration Log

No in-app purchases

Questions

Is H2 flow water fasting free?
H2 flow water fasting is free to download, with in-app purchases available.
Is Fasting Timer & Hydration Log free?
Fasting Timer & Hydration Log is free to download, with no in-app purchases.
Do H2 flow water fasting or Fasting Timer & Hydration Log have ads?
Neither H2 flow water fasting nor Fasting Timer & Hydration Log shows ads.
Which is updated more often, H2 flow water fasting or Fasting Timer & Hydration Log?
H2 flow water fasting ships an update monthly, and Fasting Timer & Hydration Log every 5 weeks. Most recently, H2 flow water fasting was updated on September 23, 2026 and Fasting Timer & Hydration Log on September 21, 2026.

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