Comparison

Interval Timer vs Terra Grip

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

Head to head
About

Interval Timer

Organize your running and high-intensity interval training sessions with ease. Quickly set up custom time intervals for running, walking, warm-ups, and cool-downs. Receive voice and vibration notifications for interval changes, and enjoy background music playback.

Highlights
  • Intuitive design
  • Customizable time intervals
  • Warm-up and cool-down timers
  • Voice and vibration notifications
  • Background music support
  • Foreground/background operation
Features
Read full description

Interval Run is a running interval timer for iPhone and Apple Watch. Create run/walk intervals, sprint sessions, and HIIT workouts in seconds. Train with voice announcements and haptic cues, control workouts from Apple Watch, save sessions to Apple Health, and track your workout history. Choose from 25+ ready-made running workouts or build your own. Follow intervals from the Lock Screen and Dynamic Island, and focus on your run. 25+ READY-MADE RUNNING WORKOUTS • Explore run/walk workouts, running intervals, sprints, hill repeats, tempo runs, fartlek sessions, ladders, pyramids, and more • Find workouts for speed, endurance, recovery, and different training goals • Start any workout immediately or customize it to match your training • Save your favorites to My Workouts for quick access BUILD YOUR OWN INTERVAL WORKOUT • Create simple run/walk intervals or advanced multi-step workouts • Add warm-up, running, walking, recovery, rest, and cool-down sections • Set a custom duration for every step • Repeat intervals and complete workout blocks • Add custom cues to guide you through each workout step • Build sprint, HIIT, cardio, and structured running sessions • Save multiple workouts and reuse them anytime • Preview the complete workout before you start VOICE & HAPTIC INTERVAL CUES • Hear clear voice announcements at every interval transition • Feel haptic cues when it’s time to run, walk, recover, or rest • Keep your workout active while your iPhone is locked or the app is in the background • Follow your current interval from the Lock Screen and Dynamic Island with Live Activities • Listen to music, podcasts, or audiobooks while you train RUN WITH APPLE WATCH • Sync workouts to Apple Watch • Start, pause, and control workouts directly from your wrist • Run phone-free with your workouts ready on Apple Watch • Follow interval progress without repeatedly checking your phone • Track heart rate, distance, and active energy during your workout • Get haptic interval cues directly on your Watch • Save completed workouts to Apple Health TRACK YOUR TRAINING • Browse completed workouts in calendar and history views • Review workout duration, intervals, distance, and active energy • Look back at your running and interval training over time • Share your workout results • Export and restore backups of your workout data MADE FOR RUNNERS WHO TRAIN WITH INTERVALS Whether you’re starting with beginner run/walk intervals, adding speed work to your weekly training, preparing for a 5K or another race, or creating a challenging HIIT session, Interval Run keeps every interval clear from start to finish. Use it as a simple run/walk timer, a running interval timer for speed training, an Apple Watch interval timer for phone-free workouts, or a flexible workout builder for more advanced structured sessions. From beginner run/walk workouts to sprints, tempo runs, hill repeats, fartlek training, and custom multi-step sessions, Interval Run adapts to the way you train. Start with one of 25+ ready-made workouts or create your own. Interval Run handles the timing so you can focus on your training. Some features shown, including the full workout library, advanced workout creation, multiple saved workouts, and full workout history, require Interval Run Pro. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Terra Grip

Features
Read full description

Terra Grip is the reference app for Terra's APIs. Real-time wearable data and your Apple Health history, from your device to Terra in seconds. Pair the app with your Terra dashboard by scanning a QR code. Connect a Bluetooth heart-rate sensor, your Apple Watch, or your phone's own motion sensors, and watch your live readings flow on the phone and on your dashboard. • One-scan pairing: a QR code from your Terra dashboard connects the app for hours. No accounts, no API keys on the device. • Stream heart rate, HRV, R-R intervals, acceleration and more from BLE sensors • Apple Watch: pick your workout, then stream heart rate, energy, distance, speed, steps and heart rate variability alongside the watch's motion sensors • No wearable handy? Stream your phone's built-in motion sensors • Live view of every reading as it streams, charted in real time • Keeps streaming while your phone is locked or in your pocket • Apple Health: read your workouts, day totals, sleep, body measurements, nutrition and cycle tracking over any range up to 31 days, see them in the app, and send them to your dashboard Apple Health integration: with your permission, Terra Grip reads your workouts, steps, active energy, exercise time, distance, flights climbed, heart rate, resting heart rate, heart rate variability, VO2 max, sleep, weight, height, BMI, body fat, food energy, water, protein, carbohydrates, fat, sugar and cycle tracking from Apple Health, shows each of them in the app, and sends them to the Terra dashboard you paired with. New readings are also read and sent in the background, so this keeps working when the app is closed. It never writes to Apple Health. Your health data is used only to provide this service and is never used for advertising or marketing. You choose which categories to share when you connect, and can change or revoke access at any time in the Health app under Sharing. Curious how it feels? Tap "Try the demo" on first launch — the full experience on synthetic data, no account needed. Built for developers evaluating Terra's APIs. Terra Grip uses the Streaming API for live sensor data and the Health & Fitness API to read Apple Health. Both need a Terra developer account (tryterra.co) to generate the pairing code the app scans. Terra Grip is a reference app for development and testing. It shows data as reported by the connected device or by Apple Health, without interpretation or derived measurements. It is not a medical device and does not provide medical advice, diagnosis, or treatment. Always consult a doctor or other qualified healthcare provider before making any medical decisions, and never rely on this app as a substitute for professional medical advice.

Screenshots

Interval Timer4 screens
Terra Grip3 screens

Verdict

The call

The clearest difference is in-app purchases: Terra Grip at none against Interval Timer's 3. Terra Grip also leads on update cadence (every 5 days vs every 3 months) and iOS requirement (15.1 vs 26.0). On price, 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. Interval Timer sells 3 in-app purchases, starting at $2.99 per month. Terra Grip asks for nothing beyond the download.

UpkeepUpdate frequency

Interval Timer ships an update every 3 months, Terra Grip every 5 days. The most recent releases landed on October 14, 2026 and October 6, 2026 respectively.

Scorecard3 real differences · 7 level
Interval Timer versus Terra Grip: the parameters behind the verdict, then further details
ParameterInterval TimerTerra Grip
PriceFreeFree
Rating4.5 (534 ratings) — better—
Positive reviews21.1% of reviews—
Number of ratings534 — better—
Update frequencyEvery 3 monthsEvery 5 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple WatchiPhone, iPod, Apple Watch
Requires iOS26.015.1 — better
Further details — not scored
Size16 MB28 MB
Age rating4+4+
DeveloperRoma SosnovskyTerra Enabling Developers

Bugs and requests

Interval Timer

Reported bugs

4 issues
  • Timer resets or freezes during workout
  • Prompts not working when phone is locked or in pocket
  • Unexpected interval changes or duration changes
  • Compatibility issues with music playback

Requested features

6 requests
  • Option to pause/resume timer
  • Larger time remaining display
  • Apple Watch app
  • Ability to play audio prompts even with screen off
  • More interval options (run/walk/jog)
Show 1 more
  • Congratulatory audio cue at the end

Terra Grip

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Interval Timer

Subscriptions2
  • Interval Run Pro Monthly$2.991 Month
  • Interval Run Pro Annual7 Days trial$19.991 Year
One-time1
  • Full Version$2.99
None

Terra Grip

No in-app purchases

Questions

Is Interval Timer free?
Interval Timer is free to download, with in-app purchases available.
Is Terra Grip free?
Terra Grip is free to download, with no in-app purchases.
Do Interval Timer or Terra Grip have ads?
Neither Interval Timer nor Terra Grip shows ads.
Which is updated more often, Interval Timer or Terra Grip?
Interval Timer ships an update every 3 months, and Terra Grip every 5 days. Most recently, Interval Timer was updated on October 14, 2026 and Terra Grip on October 6, 2026.

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