Comparison

RUN interval vs SFS App

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

SFS App

Features
Read full description

SFS (StraightForward Smiles) is a modern dental-care application designed to help patients easily manage their oral health, book appointments, access treatment history, receive important reminders, and stay connected with their dentist through a smooth and user-friendly experience. The app brings your entire dental journey into one place, offering secure access to your medical records, diagnosis details, prescriptions, past visits, and progress tracking. With its simple interface and strong privacy protection, SFS ensures that your personal health information remains safe at all times. Real-time notifications, personalized dental-care tips, and follow-up reminders help you stay consistent with your treatment and maintain a healthier smile. SFS aims to make dental care simple, transparent, and accessible for everyone, allowing every patient to confidently track and improve their dental wellness.

Screenshots

RUN interval4 screens
SFS App4 screens

Verdict

The call

The clearest difference is in-app purchases: SFS App at none against RUN interval's 2. SFS App also leads on iOS requirement (13.0 vs 15.6). 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. SFS App asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 2, 2026 and October 30, 2026 respectively.

Scorecard2 real differences · 8 level
RUN interval versus SFS App: the parameters behind the verdict, then further details
ParameterRUN intervalSFS App
PriceFreeFree
Rating4.7 (1K ratings) — better—
Positive reviews77.1% of reviews—
Number of ratings1K — better—
Update frequencyEvery 3 monthsEvery 3 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPod, Apple WatchiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size34 MB24 MB
Age rating4+4+
DeveloperCAN YOU HEAR ME SOFTWAREDEVBUNCH (PRIVATE) LIMITED

In-app purchases

2 purchases

RUN interval

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

SFS App

No in-app purchases

Questions

Is RUN interval free?
RUN interval is free to download, with in-app purchases available.
Is SFS App free?
SFS App is free to download, with no in-app purchases.
Do RUN interval or SFS App have ads?
Neither RUN interval nor SFS App shows ads.
Which is updated more often, RUN interval or SFS App?
RUN interval ships an update every 3 months, and SFS App every 3 months. Most recently, RUN interval was updated on November 2, 2026 and SFS App on October 30, 2026.

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