10K Trainer by C25K® vs Fastime
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
10K Trainer by C25K®
This app guides beginners from sedentary to running a 10K in 14 weeks with a structured walk/run program. It features an audio coach, progress tracking, and community support. Ideal for those new to running or graduating from a 5K program.
- 14-week walk/run training plan
- Audio coach guidance
- Progress tracking
- Community forums
- Integration with Health app
- Music integration
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■ The Official 10K Trainer app with millions of success stories! ■ Official partners and the ONLY C25K (Couch to 5K) app featured on FITBIT and SAMSUNG smart watches! ■ Featured on The New York Times, Los Angeles Times, The Washington Post, The Guardian, The Huffington Post, Men's Fitness, Forbes, Mashable, Glamour Magazine, Popsugar Fitness, CBS News, NBC News, Macworld, Cosmopolitan, Lifehacker, WebMD and many more! "Daily programs that alternate between short bursts of walking and running until you're ready to go the distance." - Forbes "One of the highest-rated health and fitness apps... A modest, realistic workout schedule." - Men's Fitness ≈ Real-Life Inspirational Transformations ≈ ◎ Over 175,000 Likes and 1500 Success Photos at facebook.com/c25kfree ◎ Our community inspires one another (and inspires us!) everyday. Hear some of their amazing stories. "In this last year I have lost 97 lbs, gotten off insulin and 9 other medications, completed the C25K running app and started the 10k app. Life is a blessing." - Diana “I went from a size 16 to a size 7. I tell anyone I can about the app. because it was nothing short of a life changer.” - Amber 10K Trainer is the easiest program to get beginners from couch potatoes to 10K distance runners in just 14 weeks. By the same experts who created the #1 C25K® (Couch to 5K) training app! Don’t worry, if you are already a 5K graduate, you can skip ahead and pick up where C25K® app leaves off! This proven 14 week plan will allow users to slowly build strength and stamina by alternating between walking and running. The blend of walking and running together reduces the overall impact and risk of injury, keeps your body guessing, and prepares you to go the distance. By the end of the program, you will be stronger and healthier than you have ever been. You'll be a 10K runner! Turn on our award winning music and just press start! Our audio coach will guide you through your run! It's that easy! ≈ Less is More ≈ ◎ First week free! Easy to learn. Just press start! ◎ Ideal for beginners. ◎ 14 weeks total. ≈ Features ≈ ◉ Easiest 10k program at only 3 times/week ◉ Convenient audio coach and alerts ◉ Map your run at the end of your workout! ◉ Light and dark modes ◉ Integrates with the Health app ◉ Free iPad integration for indoor treadmills ◉ Integrated with Facebook, Twitter, and Instagram ◉ Access to our forums with thousands of veterans and newcomers starting the app. Join the community and meet other runners! ≈ NEW Zen Unlimited Pass - Try it for free! ≈ ◉ Award winning music curated from top DJ's! ◉ Scientifically proven to increase motivation by 35% ◉ Unlimited access to all pro features across ALL Zen Labs Fitness apps ◉ Unlock calories, distance, Apple watch integration, and more ◉ One subscription unlocks all our apps! Questions/comments? Please email us at contactus@zenlabsfitness.com, or visit us at www.zenlabsfitness.com. ≈ Connect ≈ Facebook: @C25Kfree Twitter: @C25Kfree Instagram: @officialc25k Hashtag: #C25K Zen Labs is a proud supporter of the National Breast Cancer Coalition. breastcancerdeadline2020.org Subscription pricing and terms: The subscription will automatically renew unless turned off in your iTunes Account Settings at least 24 hours before current period ends. You can go to your iTunes Account settings to manage your subscription and turn off auto-renew. Your iTunes Account will be charged when the purchase is confirmed. If you subscribe before your free trial ends, the rest of your free trial period will be forfeited as soon as your purchase is confirmed. Privacy Policy & Terms of Use: https://www.zenlabsfitness.com/privacy-policy/ Legal Disclaimer This app and any information given by it or by Zen Labs LLC are for educational purposes only. You should always consult your healthcare provider before beginning any fitness program. C25K® is a registered trademark of Zen Labs LLC
Fastime
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Fastime is a simple, private intermittent fasting tracker that helps you start a fast, stay consistent and actually see your progress. Pick a plan, start the timer, and follow your body through each fasting stage. Fastime handles the rest. FASTING TIMER & PLANS • Seven plans: 12:12, 14:10, 16:8, 18:6, 20:4, 24:0 and fully custom • Live countdown with a progress ring, and the exact time your fast ends • Eating-window timer so you know when to eat • Not sure where to start? Answer 5 quick questions and get a plan made for you • A summary when every fast ends: how long, the stage you reached, and how it felt FASTING STAGES Follow your body in real time through Fed → Fat Burning → Ketosis → Autophagy → Deep Fast, with a short note on what each stage means. HOME SCREEN WIDGET See your current fast and your streak without opening the app. PROGRESS & INSIGHTS • Day streaks and a weekly report: total fasting time, average, longest fast and consistency • Month calendar with every completed fast and weight entry • Weight log with a goal weight, and body metrics including BMI • See how your fasts felt over time • Full fasting history AI FASTING COACH Personal weekly insights built from your own fasting pattern, generated entirely on your device. WATER & STEPS • Daily water tracking with your own cup size and reminders • Step counting with a daily goal STREAKS, ACHIEVEMENTS & CHALLENGES • Streak Protection keeps your streak alive on near-miss fasts • Unlock achievements as you go • Challenges from a 3-day starter all the way to 100 fasts SMART REMINDERS Notifications when your fast starts, at halfway, at key stages, when it's complete, and before your eating window ends, plus an optional daily reminder to start fasting. APPLE HEALTH Optionally sync your completed fasts and weight with Apple Health. YOUR DATA, ON YOUR DEVICE Your fasting history, weight and logs are stored on your device. Export a backup or a CSV any time, and if you reinstall, restore your fasts and weights from Apple Health. 10 LANGUAGES English, Arabic, Swedish, French, Spanish, German, Portuguese, Russian, Chinese and Japanese, with full right-to-left support for Arabic. Start your first fast today.
Screenshots
Verdict
The clearest difference is in-app purchases: Fastime at none against 10K Trainer by C25K®'s 6. Fastime also leads on ads (none vs shown) and update cadence (every 2 days vs every 6 weeks). On price, device support 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
Both are free to download. 10K Trainer by C25K® sells 6 in-app purchases, starting at $4.99 per month. Fastime asks for nothing beyond the download.
10K Trainer by C25K® ships an update every 6 weeks, Fastime every 2 days. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.
| Parameter | 10K Trainer by C25K® | Fastime |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (22K ratings) — better | — |
| Positive reviews | 76.2% of reviews | — |
| Number of ratings | 22K — better | — |
| Update frequency | Every 6 weeks | Every 2 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 321 MB | 59 MB |
| Age rating | 4+ | 4+ |
| Developer | Zen Labs | Khaled Almelhem |
Bugs and requests
10K Trainer by C25K®
Reported bugs
2 issues- Timers not syncing accurately with other devices
- Workout data sometimes not recorded properly
Requested features
3 requests- Apple Watch integration for standalone use
- More advanced training options beyond just 10K
- Ability to customize audio prompts and volume
Fastime
Not enough reviews yet to summarise bugs or requests.
In-app purchases
10K Trainer by C25K®
- Zen Unlimited Pass Monthly1 Month trial$4.991 Month
- Unlock Your Potential7 Days trial$29.993 Months
- Unlock Your Potential1 Month trial$29.993 Months
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- Zen Unlimited Pass Annual7 Days trial$74.991 Year
- Remove Ads$1.99
- Go To Pro$6.99
Fastime
No in-app purchases
Questions
Is 10K Trainer by C25K® free?
Is Fastime free?
Do 10K Trainer by C25K® or Fastime have ads?
Which is updated more often, 10K Trainer by C25K® or Fastime?
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