Comparison

RunDay vs Time to fast!

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

Head to head
About

RunDay

This app offers a comprehensive running experience with 100% voice training, customized plans for all levels, and social features to motivate friends. It also includes stretching, muscle training, and smartwatch integration for a complete fitness journey.

Highlights
  • 100% full-voice training
  • Customized running plans
  • Sound mixing system for music
  • Stretching and muscle training
  • Add and motivate friends
  • Smartwatch compatibility
  • Apple Health integration
Features
Read full description

“I want to start running but it is hard to start.. there is no much information.” “Running alone feels more tired, I feel like give up more quickly.” “I cannot run that much longer.. No much stamina make me exhausted fast.” Lack of information, Unsteady plan, Physique management, Going on a Diet All this problem will be gone together with RunDay. [Why RunDay?] ▶ 100% Full-voice training eling like you're running with your own trainer, although you're starting running for the first time, you can finish the 30 minutes running with RunDay trainer. ▶ Various customized running plan RunDay provides 30 mins running for beginners (24 days course), interval training (6 days repeat), Everyday 30 mins running (everyday repeat), Free running (users customizing running), Hiking and challenge running. ▶ Sound mixing system You can concentrate in running with the suitable music for your running intensity. You can also listen to the music that you want through the music streaming application. ▶ Supports Stretching and Muscle training RunDay provides stretching and muscle training menu for the users. For your healthy running life, it is most important to do stretching before and after the running. ▶ Add RunDay Friends Add your RunDay Friends and check the friend record. Push alarm will send when your friends start running. You can motivate your friends with the cheer up message when they are running. Don't be sad that you could not send the motivation message, you can like the friend’s record. ▶ Runday Watch app support! Using the Runday Watch app on Apple Watch, Runday's training program provided on mobile alone without a mobile phone You can proceed, and the exercise records of the Apple Watch can be reflected in the mobile Runday record menu. ▶ Smartwatch compatibility You can share the workout data through the connection of Smartwatch ▶ Workout data of Apple Health app may reflected to RunDay through integration of Health app with RunDay. * Solve your diet with RunDay!* ▶ If you keep turn on GPS at the background, the battery lifespan might be reduced. ▶Access authority 1. Location authority of users : This authority is required to record running data using GPS and using location service at the background. 2. Authority to access Apple music, your music and video activity, and media library : This authority is require to listen to the music in Apple music, your music and video activity, and media library while you're running. 3. Authority access to send you notification : This authority is required to send motivation push message to friends while running. 4. Camera access allowance : Access to share your running info on SNS or use as profile photo by taking photo. 5. Gallery access allowance: Access to share your running info on SNS or use as profile photo by taking gallery. 6. Microphone acces : Microphone permission is required to record voice messages. 7. Voice Recognition Access : Permission is required to find slang for voice messages. 8. Physical activity authority: This is the authority required to measure the number of steps and awareness of movement. 9. Apple Health: Use HealthKit to exercise and exercise pathways. ▶ In order to use the run day service, the following information must be entered when registering as a member. 1. Run day account creation: email address, password 2. Community Use: Nickname 3. Challenge mode and marathon use: nickname date of birth, gender After access permission, you can reset or revoke access as follows After you agree to the access authority, you may withdraw or reset through the below way. Settings > Select RunDay > Select agree or withdraw for access authority facebook : https://www.facebook.com/Everyday-RunFit-110685420520269/ Partnership and Advertising Inquiry: contact@ttam.ai ▶ RunDay Terms and Conditions https://health.runday.co.kr/runday_standardterms_en.html ▶ RunDay Privacy Policy https://health.runday.co.kr/runday_policy_personal_en.html

About

Time to fast!

Easily monitor your intermittent fasting schedule with a visual 24-hour timeline. Adjust plans, track progress, and receive timely notifications for fasting and eating periods. Save your results and review past fasting records to stay on track with your health goals.

Highlights
  • Circular 24-hour timeline
  • Adjustable fasting plans
  • Save and edit fasting results
  • Past fasting records review
  • Fasting start/end notifications
  • Pre-set fasting plans
Features
Read full description

Easily track your intermittent fasting schedule with a circular 24-hour timeline that clearly shows your fasting and eating periods. Your current status and remaining time are always at your fingertips. You have the flexibility to adjust your fasting plans at any time and save your results once your fasting window is complete. Plus, you can conveniently access your past fasting records! - Simply press the start/stop button to initiate the timer according to your chosen plan. - Modify your fasting plan on the go, even while the timer is running. - Choose from five pre-set fasting plans and set your meal times with ease. - Edit the start time for the current session during your fasting period. - Save and edit your most recent fasting results during your eating window. - If fasting feels too challenging today, use the 'Break the Fast' button to end it early and save your progress. - To begin fasting a bit earlier today during your mealtime, select the 'Start Fast Early' button to adjust your fasting start time for this session. - Review your fasting records for the past week in a graph and track your progress in the calendar alongside your goal achievements. - Enable notifications to receive fasting start/end alerts.

Screenshots

RunDay4 screens
Time to fast!4 screens

Verdict

The call

The clearest difference is in-app purchases: Time to fast! at none against RunDay's 26. Time to fast! also leads on ads (none vs shown) and review sentiment (71% vs 44%). RunDay's advantage is device support (3 vs 1). On price, update cadence and iOS requirement 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. RunDay sells 26 one-off in-app purchases. Time to fast! asks for nothing beyond the download.

UpkeepUpdate frequency

RunDay ships an update every 5 days, Time to fast! every 3 days. The most recent releases landed on September 21, 2026 and June 1, 2026 respectively.

Scorecard5 real differences · 5 level
RunDay versus Time to fast!: the parameters behind the verdict, then further details
ParameterRunDayTime to fast!
PriceFreeFree
Rating4.3 (193 ratings) — better—
Positive reviews44.0% of reviews71.4% of reviews — better
Number of ratings193 — better—
Update frequencyEvery 5 daysEvery 3 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPod, Apple Watch — betteriPhone
Requires iOS15.0 — better16.0
Further details — not scored
Size378 MB13 MB
Age rating12+4+
DeveloperTTAMEunbee Kang

Customer experience

RunDay

All ratings193 ratings
Positive80.3%
Neutral6.7%
Negative13.0%
Written reviews159 reviews
Positive44.0%
Neutral17.0%
Negative39.0%

Time to fast!

Written reviews7 reviews
Positive71.4%
Neutral28.6%
Negative0.0%

Bugs and requests

RunDay

Reported bugs

4 issues
  • Inability to join crews for some users
  • Workout records not saving properly
  • Syncing issues between iPhone and Apple Watch
  • Inconsistent performance after updates

Requested features

4 requests
  • Apple Watch app support
  • Customizable voice coach options
  • Ability to mute voice coach
  • Improved music integration

Time to fast!

Not enough reviews yet to summarise bugs or requests.

In-app purchases

26 purchases

RunDay

One-time26
  • sweat190drops$0.99
  • Runday Watch App 30-Day Pass$2.99
  • sweat490drops$2.99
Show 23 more
  • sweat490drops_watchstd$2.99
  • Runday Watch App 30+30days$3.99
  • sweat600drops_nicerun$3.99
  • sweat990drops_watchstd$5.99
  • Runday Watch App 90-Day Pass$5.99
  • Runday Watch App 90+90days$6.99
  • sweat1200drops_10powerrun$6.99
  • sweat1200drops_nicerun$6.99
  • sweat990drops$6.99
  • sweat1200drops_nicerun_event$8.99
  • sweat1900drops_SlowJogging$11.99
  • sweat1900drops$12.99
  • sweat2500drops_5Kin30min$14.99
  • sweat2900drops_domore$17.99
  • Runday Watch App 365-Day Pass$17.99
  • sweat2900drops$17.99
  • sweat2900drops_watchstd$17.99
  • sweat2900drops_SlowJogging$17.99
  • Runday Watch App 1+1years$19.99
  • sweat2900drops_gona10k$19.99
  • sweat2,990drops$19.99
  • sweat3900drops_gona10k$29.99
  • Remove AD$54.99
None

Time to fast!

No in-app purchases

Questions

Is RunDay free?
RunDay is free to download, with in-app purchases available.
Is Time to fast! free?
Time to fast! is free to download, with no in-app purchases.
Do RunDay or Time to fast! have ads?
RunDay shows ads; Time to fast! does not.
Which is updated more often, RunDay or Time to fast!?
RunDay ships an update every 5 days, and Time to fast! every 3 days. Most recently, RunDay was updated on September 21, 2026 and Time to fast! on June 1, 2026.

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