Comparison

RUN interval vs Sprint Eight

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

Head to head
About

RUN interval

This app simplifies interval and Fartlek running by allowing you to set custom targets for time or distance during hard, easy, and rest efforts. It offers detailed post-run summaries, audio and visual feedback, and an Apple Watch app for enhanced training.

Highlights
  • Customizable interval sessions
  • Time and distance targets
  • Distance Goal option
  • Audio and visual feedback
  • Detailed run summaries
  • Apple Watch app
  • Strava sharing
Features
Read full description

Easily set up and record your Interval and Fartlek running sessions. With the flexibility of using time and/or distance as interval targets for your "Hard", "Easy" and "Rest" efforts. The simple but highly configurable interface on your phone and watch will have you running sooner. Now with a Distance Goal option for your session. Along with great audio and visual feedback, detailed post-run summary, share your runs to Strava, and a full-featured Apple Watch app. You can also record your regular runs with voice-over calling out distance and pace feedback. Key Features: • Easily create flexible custom interval sessions. • Utilize three effort targets "Hard", "Easy" and "Rest" in each set, targeting time or distance (meters or miles). • You can "Skip" any of the three efforts to create flexible sets, like building a progressive intervals session. • NEW: Set a Distance Goal for your session, that repeats the sets from the start until the distance has been reached. • Set a Warm-Up and Warm-Down timer or distance around your session. • Clear and easily glanceable visuals and audio prompts, including vibrations. • Voice-over prompts to save you from looking at the screen, great for iPhone or headphone users. • Voice-over prompts include the upcoming intervals effort and time/distance amount, and your last intervals average pace and heart rate. • Full-featured Apple Watch App! • Heart Rate Zones! (see description below) • Indoor Mode, no GPS, for treadmill running. • Sound Mode, for normal, discrete or silent audio prompts on your watch. • Vibration feedback on both the phone and watch. • Detailed run summary, showing pace for hard and easy efforts. • The run summary also includes interval breakdown, distance breakdown and heart rate details. • Play music or podcasts while running and still hear the audio prompts. • Sharing. Share a summary photo with your friends. • Private data. We don’t send any of your data to a server or share it with anyone. Session Types: • Normal Run – Record a normal run, long or short. • Record Intervals – If you run with a group or do an undefined session, then use the Record Interval option. It allows you to manually change between "Hard" and "Easy" reps, allowing you to record your session. • Custom Intervals – Our fully flexible intervals that allow you to use time and/or distance for the efforts. Add multiple intervals sets together to create the session you want. Sharing: From the summary screen, you can share your runs with friends or across social media. If you want to share directly with friends or across other social media, you can share a summary image with the details of your run. Heart Rate Zones: (Apple Watch Only) Zones are displayed as grouped percentages of your maximum heart rate. Giving you an indication of your current work rate based on your current heart rate. Just enter your maximum workout heart rate into our Settings screen and they will display on your Watch the next time you run. Zone 1: Very Light Effort 50-60% (Gray) Zone 2: Light Effort 60-70% (Blue) Zone 3: Moderate Effort 70-80% (Green) Zone 4: Hard Effort 80-90% (Yellow) Zone 5: Maximum Effort 90-100% (Red) Privacy: We don’t want to know where you have run, that's for you to worry about. We don’t send any of your data to a server or share it with anyone you don't want too. We keep your running records safe in Apple Health so you have control. Apple Heath gives you the control over who accesses your data. We only write and read the data we record from your running. Feedback: And because we don't send any data to a server, we need you to send us feedback and suggestions. Hit the Support link below or visit our website to contact us.

About

Sprint Eight

This app guides you through a high-intensity interval training workout designed for maximum calorie burn in minimal time. It provides timed intervals for sprinting and resting, allowing you to perform the exercise without specialized equipment.

Highlights
  • High Intensity Interval Training (HIIT)
  • Maximum calorie burn
  • No extra equipment needed
  • Timed sprint and rest intervals
  • 30-second sprint / 90-second rest cycle
Features
Read full description

Working out is never fun so you need to get the most out of your workout when you can do it. Sprint-8 is a form of High Intensity Interval Training (HIIT) that allows maximum calorie burn in the shortest timeframe. Usually, this particular workout is done on a treadmill or stationary bicycle. This app lets you do the Sprint-8 workout and not have to have any extra equipment. It tells you when to sprint and then when to rest. Sprint-8 does this on a 30 second sprint/90 second rest cycle.

Screenshots

RUN interval4 screens
Sprint Eight2 screens

Verdict

The call

The clearest difference is in-app purchases: Sprint Eight at none against RUN interval's 2. Sprint Eight also leads on iOS requirement (10.3 vs 15.6). RUN interval's advantage is rating (4.7 vs 4.3) and ratings volume (1K vs 10). 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. RUN interval sells 2 one-off in-app purchases. Sprint Eight asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

RUN interval holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: RUN interval has 1K ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 77% of RUN interval's written reviews are positive against 60% of Sprint Eight's.

UpkeepUpdate frequency

RUN interval ships an update every 3 months, Sprint Eight every 6 weeks. The most recent releases landed on October 15, 2026 and October 3, 2026 respectively.

Scorecard6 real differences · 4 level
RUN interval versus Sprint Eight: the parameters behind the verdict, then further details
ParameterRUN intervalSprint Eight
PriceFreeFree
Rating4.7 (1K ratings) — better4.3 (10 ratings)
Positive reviews77.5% of reviews — better60.0% of reviews
Number of ratings1K — better10
Update frequencyEvery 3 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPod, Apple WatchiPhone, iPad, iPod
Requires iOS15.610.3 — better
Further details — not scored
Size34 MB21 MB
Age rating4+4+
DeveloperCAN YOU HEAR ME SOFTWAREBrad McAnalley

Customer experience

RUN interval

All ratings1,003 ratings
Positive94.3%
Neutral1.6%
Negative4.1%
Written reviews191 reviews
Positive77.5%
Neutral5.2%
Negative17.3%

Sprint Eight

All ratings10 ratings
Positive80.0%
Neutral10.0%
Negative10.0%
Written reviews5 reviews
Positive60.0%
Neutral20.0%
Negative20.0%

In-app purchases

2 purchases

RUN interval

One-time2
  • The full RUN interval$1.99
  • The full RUN interval$3.99
None

Sprint Eight

No in-app purchases

Questions

Is RUN interval free?
RUN interval is free to download, with in-app purchases available.
Is Sprint Eight free?
Sprint Eight is free to download, with no in-app purchases.
Which has better reviews, RUN interval or Sprint Eight?
RUN interval is rated higher. RUN interval averages 4.7 out of 5 from 1K ratings, while Sprint Eight averages 4.3 from 10 ratings.
Do RUN interval or Sprint Eight have ads?
Neither RUN interval nor Sprint Eight shows ads.
Which is updated more often, RUN interval or Sprint Eight?
RUN interval ships an update every 3 months, and Sprint Eight every 6 weeks. Most recently, RUN interval was updated on October 15, 2026 and Sprint Eight on October 3, 2026.

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