Best Running Apps for Interval Training 2026

You set your watch, lace up, and head out for a HIIT run. Thirty seconds hard, thirty seconds easy, repeat eight times. Your phone buzzes at the wrong moment, your watch just shows elapsed time, and you lose count of which rep you are on.

Interval training - HIIT, Tabata, hill repeats, custom work-rest cycles - demands more than a basic run tracker. You need audible cues, automatic lap segmentation, and a way to build repeating sequences before you ever step outside.

We compared the top options and ranked the 6 best apps for the job. Garmin Connect takes the top spot for watch owners. Runify is not the right pick here - it does not offer structured interval timers or audio workout cues.

The best running apps for interval training in 2026 are: 1) Garmin Connect for custom interval workouts sent straight to your watch, 2) Seconds Pro for the most flexible standalone interval timer on iPhone, 3) Runna for coached interval sessions within a full training plan, 4) Intervals Pro for HIIT and Tabata timers with Apple Watch support, 5) Nike Run Club for free guided speed sessions, and 6) Runify for ranking every interval run you complete. Garmin Connect is the standout pick for runners who already own a Garmin and want full rep-by-rep guidance on their wrist.

1. Garmin Connect - Best for Watch-Guided Intervals

Garmin Connect is the strongest choice for interval training if you run with a Garmin watch. You build a custom workout in the app or web builder, set targets (pace, heart rate, or time per step), and send it to your watch before you head out.

Once the workout starts, your watch beeps or vibrates to mark each interval boundary. It shows live pace against your target and alerts you when you drift outside the target range. You never need to look at your phone mid-session.

Custom workout creation and watch sync are free. Connect+ ($6.99/month or $69.99/year) adds advanced analytics and daily suggested workouts, but interval builders are fully available on the free tier.

Key Features

Custom interval builder: Build sessions with warm-ups, work reps, recovery steps, and cool-downs. Set targets by pace, heart rate, or time.
Watch-guided execution: Your Garmin walks you through each step with real-time alerts and live pace deviation feedback.
Free core builder: Custom workouts, sync, and workout history are all free. Connect+ is optional.
Broad compatibility: Works across Forerunner, Fenix, Instinct, and most other Garmin models.

Pricing

Free for custom workouts, sync, and history. Connect+ is $6.99/month or $69.99/year, with a 30-day free trial.

Best For

Garmin watch owners wanting interval sessions delivered rep-by-rep to their wrist.
Runners who want a free structured workout tool with no required subscription.

Limitations

The full workout builder is web-based; the mobile builder is functional but less visual.
Requires a Garmin watch to use on-wrist guidance. iPhone-only runners miss the key feature.

2. Seconds Pro - Best Standalone Interval Timer

Seconds Pro is the gold standard interval timer for iPhone runners who want total control without a subscription. You build a custom timer from scratch: name each interval, set duration, pick alert sounds, and add as many work-rest cycles as you need. Tabata, hill repeat ladders, custom HIIT sequences - it handles all of them.

The app speaks your interval names aloud so you can keep your phone in your pocket. It connects to Apple Watch for wrist-based alerts and saves workout data to Apple Health automatically.

Seconds Pro is a one-time purchase at $7.99, with no subscription fees. If you want a pure timer that does exactly what you build, this is the one to get. For runners following structured coached plans, our overview of the best running apps with training plans covers dedicated coaching options.

Key Features

Fully custom timers: Name every step, set any duration, stack unlimited intervals. Tabata presets included.
Spoken interval names: Audio cues announce each step so you can run hands-free.
Apple Watch integration: Wrist-based alerts and haptics sync with your iPhone session.
Apple Health sync: All workout data saves to Health automatically for tracking history.

Pricing

$7.99 one-time purchase. No subscription. Ad-free.

Best For

Runners who want total control over work-rest sequences without a monthly fee.
Tabata and custom HIIT runners who repeat the same sequences week after week.

Limitations

Timer-only app - no GPS tracking, no route map, no post-run stats beyond time.
Pair with a separate GPS app if you want distance and pace logged alongside intervals.

3. Runna - Best for Coached Interval Plans

Runna builds structured training plans that include interval sessions as part of a complete weekly schedule. The Runna Engine personalises your plan around your goal race, fitness level, and available training days. Interval sessions come with specific pace targets per rep, not just effort descriptions.

Workouts push directly to Garmin and Apple Watch. When you start a session, your watch guides you through each rep and recovery automatically. Runna holds a 4.9-star App Store rating and is now part of the Strava family following a 2025 acquisition.

If you are already following a Runna plan, you will find relevant context on complementary tools in our best running apps for heart rate zones breakdown.

Key Features

Coached interval sessions: Specific pace targets per rep, adapted to your fitness and goal race.
Watch delivery: Sessions push to Garmin and Apple Watch for guided rep-by-rep execution.
Plan personalisation: Short onboarding survey generates a full weekly schedule tailored to your goals.
Strava sync: Completed workouts post back to Strava automatically.

Pricing

$19.99/month or $99.99/year. A combined Strava + Runna plan is available for $119.99/year. Free trial available.

Best For

Runners training for a specific race who want interval sessions woven into a full plan.
Athletes who need per-rep pace targets rather than just a basic timer.

Limitations

Pricier than a standalone timer app. Best value when you use the full training plan.
Interval sessions are coach-defined within your plan, not freely buildable from scratch.

4. Intervals Pro - Best HIIT Timer with Apple Watch

Intervals Pro is a dedicated HIIT and Tabata timer that works as a standalone app on iPhone and Apple Watch. You build timers with custom names, durations, colors, and alert sounds. Voice prompts announce each step, and the Apple Watch app runs independently so your phone can stay home.

The app saves all workout data to Apple Health and the Apple Activity app. Apple features the app and fitness coaches widely recommend it. It works beyond running too - strength, yoga, boxing, and circuit training are all supported.

Intervals Pro is free to download with a built-in timer, and an in-app upgrade unlocks unlimited custom timers and all advanced features.

Key Features

Standalone Apple Watch app: Run full interval sessions from your wrist without your phone.
Custom timer builder: Set names, durations, colors, and sounds for each interval step.
Voice prompts: Spoken alerts announce each step so you can run ears-only.
Apple Health integration: Workout data saves to Health and shows in the Activity app.

Pricing

Free to download with a basic built-in timer. In-app upgrade unlocks unlimited timers and all features (one-time purchase available).

Best For

Runners who want a reliable Apple Watch timer for HIIT and Tabata sessions.
Cross-training athletes who use interval timers across multiple workout types.

Limitations

No GPS tracking or route mapping. Pair with a separate running app if you need distance data.
The free tier limits how many custom timers you can build.

5. Nike Run Club - Best Free Option

Nike Run Club includes a guided speed run collection with pre-built interval workouts led by audio coaches. Sessions like "Pick Up the Pace" and "Speedplay" include automatic lap cues so you just press start and follow along. NRC marks interval splits automatically in post-run stats.

The app is completely free with no subscription required. GPS tracking, Apple Watch integration, and a run history are all included at no cost. NRC does not let you build fully custom interval sequences from scratch - you work from the guided run library.

For a deeper look at how NRC compares against the field, see our best running apps for speedwork comparison.

Key Features

Guided speed runs: Audio-coached interval workouts with automatic lap cues included in the library.
Free GPS tracking: Live time, distance, pace, and route with Apple Watch support.
Auto lap marking: Interval splits appear in post-run stats without manual input.
Large run library: Hundreds of guided runs across interval, tempo, easy, and long-run types.

Pricing

Free. No subscription, no paywall on core features.

Best For

Runners who want free coached interval sessions without building anything themselves.
Beginners trying interval training for the first time who need audio guidance.

Limitations

You cannot build custom intervals from scratch. You work from pre-built guided runs.
No Garmin sync. Apple Watch and iPhone only for GPS sessions.

6. Runify - Best for Ranking Your Interval Runs

Runify does not offer structured interval timers, custom workout builders, or audio coaching during runs. That is important to say clearly. If you need work-rest cues and rep counts, one of the apps above serves that need.

Where Runify fits is on the other side of the run. Every interval session you complete counts. Log it with the built-in GPS tracker or sync from Apple Watch, Garmin, or Strava - those miles earn XP and move you up the ranked tier system.

Runify holds a 4.8-star App Store rating with 626+ reviews and has logged over 100,000 runs across its community. If staying accountable to your interval routine is half the battle, having your hard sessions count toward something visible helps.

Key Features

Ranked Progression System: Every run earns XP toward an overall Runify Rank. Rank decay when you go inactive keeps consistency visible.
Friends and Global Leaderboards: Race your friend group or the global Runify community across 800m, 1K, 5K, 10K, half, and marathon leaderboards.
Apple Watch, Garmin, and Strava Sync: Bulk-import past runs and auto-detect new ones. Your existing tracker keeps working.
In-App GPS Tracking: Live GPS with time, distance, pace, and route. Rich post-run summary with splits and photos.
Shareable Run Recaps: Stylized recap templates with one-tap Instagram Stories sharing.

Pricing

Monthly: $4.99/month (no free trial). Annual: $39.99/year with a 7-day free trial. Pro unlocks distance-specific leaderboards and expanded profile and history views.

Best For

Runners who want interval runs to count toward a rank and leaderboard position.
Apple Watch, Garmin, or Strava users who want a competitive layer on top of their existing tracking.

Limitations

iOS only. No Android support today.
No structured interval timers, custom workout builders, or audio coaching during runs.
No route discovery or race signup features.

How to Choose the Best Interval Training App

The right pick depends on what kind of interval training you do and how you prefer to be guided. Here are the five factors that matter most.

Do you own a Garmin watch? If yes, Garmin Connect's free custom workout builder and watch delivery is hard to beat. You build the session once, send it to your watch, and never need to touch your phone mid-run.
Do you want a timer or a coaching plan? Seconds Pro and Intervals Pro are pure timers - total flexibility, no coaching. Runna wraps intervals inside a complete training plan with per-rep pace targets. These are different products solving different problems.
Do you use Apple Watch for interval sessions? Intervals Pro runs as a standalone app on your wrist. The native Apple Watch Workout app also supports custom work-rest intervals if you prefer keeping it built-in.
How important is GPS tracking alongside your timer? Seconds Pro and Intervals Pro are timer-only apps. Pair them with a separate GPS app if you need distance and pace. NRC, Garmin Connect, and Runna combine timer and GPS in one place.
What is your budget? Nike Run Club is entirely free. Seconds Pro is a one-time $7.99 purchase. Garmin Connect's interval builder is free for Garmin owners. Runna is the most expensive at up to $19.99/month but delivers the most structure for goal-race training.

Frequently Asked Questions

What is the best app for interval training running in 2026?

Garmin Connect is the top pick for runners with a Garmin watch - custom interval sessions build in the app or web builder, then push directly to your wrist for rep-by-rep guidance. Seconds Pro is the best standalone iPhone timer if you want total control over your work-rest sequences without a subscription. Runna is the strongest choice if you want coached intervals inside a full training plan. Nike Run Club is the best free option, with a pre-built guided speed run library. The right app depends on whether you need a timer, a coaching plan, or on-wrist guidance.

Is there a free app for interval running?

Yes. Nike Run Club is completely free and includes pre-built guided interval and speed run sessions with automatic lap cues. Garmin Connect's custom workout builder and watch sync are also free for Garmin watch owners - Connect+ is optional. Intervals Pro is free to download with a built-in basic timer, though an in-app upgrade unlocks unlimited custom timers. Runify offers a 7-day free trial on the annual plan ($39.99/year) for runners who want a ranked layer on top of their existing interval routine.

Can I sync my Apple Watch or Garmin with an interval training app?

Yes. Garmin Connect syncs natively with all Garmin watches and pushes custom interval workouts directly to your device. Runna supports both Garmin and Apple Watch for guided session delivery. Intervals Pro runs as a standalone Apple Watch app for wrist-based interval alerts. Runify imports runs from Apple Watch via HealthKit, Garmin Connect, and Strava automatically - so every interval session you complete in another app still counts toward your Runify rank.

What features should I look for in an interval training running app?

Look for audible or haptic cues that fire at the correct interval boundary so you can run without staring at your phone. Configurable work-rest durations and a repeat counter handle the structure. Apple Watch or Garmin delivery is important if you prefer wrist guidance. GPS tracking alongside your timer means distance and pace are logged with each interval. If you train for specific races, per-rep pace targets from a coaching app like Runna add another layer of precision to your sessions.

Does Runify offer structured interval workouts?

No. Runify does not offer structured interval timers, custom workout builders, or audio coaching during runs. For interval session guidance, use Garmin Connect, Seconds Pro, Intervals Pro, Runna, or Nike Run Club. Where Runify fits is after the run: every interval session you log - from Runify's GPS tracker, Apple Watch, Garmin, or Strava - earns XP and moves you up the ranked tier system and leaderboards. Runify is a ranked progression and social layer, not a workout delivery tool.

Final Verdict

Interval training apps split into two categories: timers that give you work-rest control, and coaching apps that build and deliver the whole session. Neither category is wrong - they serve different runners at different stages.

If you own a Garmin watch, start with Garmin Connect's free interval builder. It is the most complete on-wrist guided experience available at no extra cost. Seconds Pro is the best standalone timer for iPhone runners who want full flexibility without a subscription. Runna is the right move if you are training for a specific race and want coached intervals as part of a structured weekly plan.

Runify sits outside the interval timer category entirely but earns a spot here for one reason: accountability. Every hard interval run you complete earns XP, moves your rank, and shows up on a leaderboard. For runners who need a visible reason to keep showing up for Tuesday track sessions, that matters.

Ready to make every interval run count toward something? Download Runify on the App Store and earn XP from every session you already track.