Comparison

Interval Timer by STRNTH vs Interval Trainr

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

Head to head
About

Interval Timer by STRNTH

Features
Read full description

Interval Timer by STRNTH is a free interval timer for HIIT, Tabata, EMOM, AMRAP, boxing rounds, running intervals, stretching and more. Build any timer you want with no fixed structure, then run it hands-free and read it from across the room. BUILD ANY TIMER - Add as many steps as you like, each with its own label, duration, colour, sound and voice. - Group steps into repeat blocks so a round loops as many times as you need. - Link separate timers together to chain a warm-up, workout and cool-down into one session. - Start from a template: Couch to 5K, Tabata, HIIT, 7 minute workout, EMOM, AMRAP, boxing rounds, Pomodoro, box breathing and full body stretch. RUN IT HANDS-FREE - A giant readout inside a progress ring, sized to read from across the gym. - Full-screen colour per step so you know your phase at a glance. - Voice reads each step and announces what is next before it arrives. - Sound cues on the last three seconds, plus beep, go, switch, rest, bell, horn, gong and whistle tones. Import your own sounds too. - Optional spoken 3-2-1 countdown, a cadence metronome from 60 to 180 BPM and haptic feedback. - Choose what the screen shows: interval time, total time, interval count, the clock or heart rate. MORE TOOLS - A countdown tab with quick presets for a fast single timer. - A stopwatch with laps that highlight your fastest and slowest split. - Light and dark themes and your own custom step colours. - Share a timer as a link or a file, and import timers others send you. ACROSS YOUR DEVICES - An Apple Watch companion runs your timers on the wrist with colour and haptics. - Pair a Bluetooth heart rate strap to see live BPM, zones and more while you train. - Save finished sessions to Apple Health as workouts. - Back up your timers to your private iCloud. FREE, WITH A ONE-TIME UPGRADE Interval Timer is free and supported by ads. A single 9.99 purchase removes ads for good. No accounts, no subscriptions, no cloud sign-in. Your timers stay on your device. Part of the STRNTH family of training apps.

About

Interval Trainr

Features
Read full description

Build your workout. Set your pace. Train your way. Interval Trainr makes structured interval training simple. Create reusable workouts using Walk, Jog, Run, Sprint, or your own custom exercises, then let Interval Trainr guide you through each interval. Build straightforward workouts or create more advanced training sessions with repeat groups, warm-ups, and cool-downs. Clear countdowns and optional audio cues help you stay focused without constantly looking at your screen. BUILD YOUR TRAINING β€’ Create and save reusable interval workouts β€’ Combine Walk, Jog, Run, Sprint, and custom exercises β€’ Set precise durations for every interval β€’ Add repeat groups for rounds and circuits β€’ Add optional warm-up and cool-down sections β€’ Reorder and customize your workout at any time TRAIN WITHOUT DISTRACTIONS β€’ Clear full-screen interval countdown β€’ See your current exercise and what comes next β€’ Optional start and transition countdowns β€’ Synchronized countdown ticks β€’ Voice, tone, haptic, or silent interval cues β€’ Choose your preferred system voice and speaking rate β€’ Optional encouragement during your workout β€’ Pause, resume, restart, or stop whenever needed FOLLOW YOUR PROGRESS β€’ Keep a private history of your training sessions β€’ Review completed and stopped workouts β€’ See simple weekly and monthly progress WORKS WITH YOUR MUSIC Keep listening to music, podcasts, or other audio while you train. Interval Trainr provides brief cues while allowing your other audio to continue. PRIVATE BY DESIGN Your workouts, history, and preferences stay on your device. Interval Trainr requires no account and includes no ads, analytics, or tracking. Whether you’re building walk/run intervals, sprint sessions, circuits, or your own training routine, Interval Trainr gives you the structure you need without getting in your way.

Screenshots

Interval Timer by STRNTH4 screens
Interval Trainr4 screens

Verdict

The call

The clearest difference is in-app purchases: Interval Trainr at none against Interval Timer by STRNTH's 1. Interval Trainr also leads on ads (none vs shown). Interval Timer by STRNTH's advantage is update cadence (every 10 days vs monthly) and device support (4 vs 2). On price there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Interval Timer by STRNTH sells 1 one-off in-app purchase. Interval Trainr asks for nothing beyond the download.

UpkeepUpdate frequency

Interval Timer by STRNTH ships an update every 10 days, Interval Trainr monthly. The most recent releases landed on October 5, 2026 and October 9, 2026 respectively.

Scorecard5 real differences Β· 1 level
Interval Timer by STRNTH versus Interval Trainr: the parameters behind the verdict, then further details
ParameterInterval Timer by STRNTHInterval Trainr
PriceFreeFree
Update frequencyEvery 10 days β€” betterMonthly
AdsYesNo β€” better
In-app purchasesYesNo β€” better
DevicesiPhone, iPad, iPod, Apple Watch β€” betteriPhone, iPad
Requires iOS15.1 β€” better17.6
Further details β€” not scored
Size55 MB30 MB
Age rating12+4+
DeveloperNext Big Leap LtdTimothy Maloney

In-app purchases

1 purchases

Interval Timer by STRNTH

One-time1
  • Remove ads$9.99
None

Interval Trainr

No in-app purchases

Questions

Is Interval Timer by STRNTH free?
Interval Timer by STRNTH is free to download, with in-app purchases available.
Is Interval Trainr free?
Interval Trainr is free to download, with no in-app purchases.
Do Interval Timer by STRNTH or Interval Trainr have ads?
Interval Timer by STRNTH shows ads; Interval Trainr does not.
Which is updated more often, Interval Timer by STRNTH or Interval Trainr?
Interval Timer by STRNTH ships an update every 10 days, and Interval Trainr monthly. Most recently, Interval Timer by STRNTH was updated on October 5, 2026 and Interval Trainr on October 9, 2026.

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