Comparison

Fasting Timer by TrainerDay vs ZenRuns

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

Head to head
About

Fasting Timer by TrainerDay

This app simplifies intermittent fasting with a one-tap start and customizable durations. Track your progress visually and review your fasting history. It's designed for easy habit building without complex features.

Highlights
  • One-tap fast start
  • Customizable fasting durations
  • Flexible start times
  • Visual progress tracking
  • Fasting history
  • Shareable results
Features
Read full description

Fasting Timer is a simple, no-fuss intermittent fasting tracker designed to help you build healthy fasting habits. It's the ultimate app for ADF fasters. Each day when you start your fast. It's just one click, even when you forget to start it at your normal fasting time. Features: • One-tap start - Begin your fast instantly • Customizable durations - Set your preferred fasting window (12, 14, 16, 18, 20+ hours) • Flexible start times - Start now or schedule for later • Visual progress - See your fasting progress at a glance • History tracking - Review your completed fasts • Share your achievements - Export and share your fasting results Whether you're doing 16:8, 18:6, or any other intermittent fasting schedule, this app makes it easy to track your fasting windows without complicated setup or unnecessary features. Free and simple. Start fasting today.

About

ZenRuns

Features
Read full description

Running apps turned running into a spreadsheet. ZenRuns is a running journal — log your run in 2 seconds, build your rhythm and find joy in running. Runners who show up regularly — even with imperfect sessions — build lasting fitness. Chasing perfect data slows you down. ZenRun tracks what matters: did you show up? HOW IT WORKS - Log a run in 2 seconds. Pick your distance, enter your time, done. Use your Apple Watch or not. Run however you want, log it when you're back. - Weekly rhythm rewards showing up. Run twice a week to keep your rhythm going. Not pace. Not distance. Just being there. - 100 milestones to celebrate your journey. Your first 5K, your 100th run, a year of consistency, and beyond. - Circles, not leaderboards. Share your journey with up to 10 close friends. Build accountability and have some joyful competition. - Scenic run photos. Capture the joy of outdoor runs. Tag photos to distance markers. Build a visual album of your running journey over time. WHAT ZENRUNS DOES NOT DO - No GPS tracking. You could run without your phone. - No live pace alerts buzzing your wrist. Find your joy in running. - No leaderboards against strangers. - No heart rate zones, cadence, VO2 max, or vertical oscillation. WHO IT'S FOR - You run 2–5 times a week and want to keep doing that for years. - You value the running mindfulness as much as the physical fitness. - You've used tracking apps but yet you have not figured out how to stay consistent. - You care about running - You believe the best run is the one you actually did. BUILT BY A RUNNER, NOT A FITNESS COMPANY I've started and stopped running more times than I can count. I hardly ran at all in 2025. Then, at the beginning of this year, I set a simple goal: run 1,000km. Just to see if the habit could finally stick. I built ZenRun during the same period — alongside the runs, through the weeks of motivation and the weeks I nearly quit again. Every feature exists because it was important for me. 200km in, both the habit and the app are still going. No subscriptions. No ads. Just a runner building the tool they wished existed. Inspired by Born to Run, Murakami's What I Talk About When I Talk About Running, and the growing movement of runners leaving their GPS watches at home. EARLY ACCESS — HELP BUILD ZENRUN ZenRuns is being built in the open. You're not downloading a finished product — you're joining a small group of early runners whose feedback directly shapes what ZenRuns becomes. Vote on features, suggest ideas, and see what's coming next on our feedback board. Share your thoughts at zenrun.featurebase.app or email support@zenrun.co. Every piece of feedback makes ZenRuns better for the next runner. Your joyful running journal.

Screenshots

Fasting Timer by TrainerDay4 screens
ZenRuns4 screens

Verdict

The call

Fasting Timer by TrainerDay and ZenRuns 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. Neither carries in-app purchases, so what you see is what you pay.

ScorecardNo meaningful differences
Fasting Timer by TrainerDay versus ZenRuns: the parameters behind the verdict, then further details
ParameterFasting Timer by TrainerDayZenRuns
PriceFreeFree
Rating5.0 (12 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings12 — better—
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.1
Further details — not scored
Size30 MB33 MB
Age rating17+4+
DeveloperTrainerDay IncAseem Munshi

In-app purchases

None

Fasting Timer by TrainerDay

No in-app purchases

None

ZenRuns

No in-app purchases

Questions

Is Fasting Timer by TrainerDay free?
Fasting Timer by TrainerDay is free to download, with no in-app purchases.
Is ZenRuns free?
ZenRuns is free to download, with no in-app purchases.
Do Fasting Timer by TrainerDay or ZenRuns have ads?
Neither Fasting Timer by TrainerDay nor ZenRuns shows ads.

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