Comparison

Seconds Pro Interval Timer vs NASM EDGE

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

Head to head
About

Seconds Pro Interval Timer

This interval timer app is designed for high-intensity interval training (HIIT), Tabata, and circuit training workouts. It features a large, color-coded display, customizable interval names, and background operation. It also integrates with Apple Health to track your fitness data.

Highlights
  • Full screen colored display
  • Templates for HIIT, Tabata, Circuit Training
  • Speaks interval names and provides warnings
  • Assign music per interval
  • Runs in background
  • Share interval timers
  • Apple Health integration
Features
Read full description

Seconds Pro is an interval timer for HIIT, Tabata, EMOM, circuits and any workout built from timed intervals. It calls each interval out loud, keeps running with the screen off, and runs on iPhone, iPad and Apple Watch. Apple has featured it, and Joe Wicks, The Body Coach, has said it is the fitness app he uses more than any other. BUILD ANY WORKOUT - Start from a HIIT, Tabata or circuit template, or build a timer from scratch with sets, rounds and intervals of different lengths. - Chain timers into one compound timer, so a warm-up flows into the main set and then a cool-down. - Color-code every interval so you know what is coming before the beep. - Share a timer with a friend in one tap. HEAR IT, DON'T WATCH IT - Voice cues call out each interval by name and warn you before the next one starts. - Beeps and bells are there too if you would rather not be talked at. - Play your own music, per timer or per interval. Cues duck the music and it comes back up when they are done. - The timer keeps going in the background while you use other apps or the screen sleeps. ON THE GYM FLOOR - A full-screen, color-coded display you can read from across the room, in portrait or landscape. On iPad it uses the whole screen. - A lock button stops a stray tap from pausing your set. APPLE WATCH - Seconds Pro runs on the watch by itself, so the phone can stay in the locker. Timers you build on the phone sync to the wrist, and Quick Intervals builds a basic circuit on the watch itself. MORE TIMERS - A stopwatch that marks your best and worst laps. - A countdown timer with five preset durations (three on Apple Watch). APPLE HEALTH - Save workouts and mindful sessions to Health. With a heart rate monitor connected, Seconds Pro reads your body measurements and year of birth from Health to estimate calories burned. PAID ONCE, NOTHING TO UNLOCK - Seconds Pro is paid for up front. Every feature is included and every timer you make can be run as many times as you like. SECONDS AND SECONDS PRO - Seconds is the free version of this app. It has the same features, but each timer locks after one run until a single in-app purchase unlocks it. The two are separate products and a purchase in one does not carry over to the other. If you bought Seconds Pro, download Seconds Pro. If you bought the unlock in Seconds, download Seconds and use Restore Purchases.

About

NASM EDGE

This app provides tools for personal trainers to manage clients, create custom workouts, and track progress. It also offers resources for fitness enthusiasts, including exercise videos and daily routines.

Highlights
  • Client assessment wizard
  • Custom workout creation
  • Calorie and macronutrient calculator
  • Client dashboard with progress tracking
  • Exercise video library
  • NASM CPT exam preparation tools
Features
Read full description

NASM EDGE: The Ultimate Personal Trainer App The biggest name in personal training certification brings you best in class technology to help you provide exceptional training – and superior results – for every level of client. NEW: Prepare for the NASM CPT Exam with practice questions, flashcards, and more! EDGE APP FOR PERSONAL TRAINERS: - Assessment Wizard: Take all of the guesswork out of personal trainer client assessments and perform them quickly and accurately. - Instant Custom Workouts: Create your own custom workouts inside the EDGE personal trainer app or choose from ready-to-go sessions designed by NASM experts. - Calorie & Macronutrient Calculator: Empower your personal training clients with next-level nutrition feedback and advice that’s aligned with their fitness goals. - Client Dashboard: Keep tabs on your clients with real-time performance tracking, dynamic assessments, and more – all inside the EDGE app for personal trainers. - State-of-the-art Video Library: Access and share our curated collection of exercise videos from within the EDGE personal trainer app. It includes hundreds of NASM expert approved exercises. - Pass the Test on the First Try: Get ready for the NASM CPT Exam with official NASM study tools including 600+ practice questions, 500+ flash cards and unlimited attempts on the NASM practice test. EDGE APP FOR FITNESS ENTHUSIASTS: - Easily keep track of your workouts, progress and goals. - Learn how to perform new exercises with proper form with NASM’s extensive exercise library - Keep in touch with your personal trainer via calls, messaging and more. - Start your day off right with Wake-Up Workouts: daily 7-10 minute workout routines designed by NASM’s expert personal trainers. - Get remarkable results quicker than ever before. Brought to you by the National Academy of Sports Medicine - Empowering 500,000+ Personal Trainers. - The exclusive OPTTM methodology provides a framework for success. - Over 30 years of evidence-based expertise. Note: An auto-renewing subscription is required to access the NASM Edge Trainer Plus premium features. A purchase will be applied to your account within 24 hours of purchase or the end of the trial period, if one is offered. Subscriptions will automatically renew unless canceled at least 24-hours before the end of the current period. You can cancel anytime from your Account Settings. Any unused portion of a free trial will be forfeited if you cancel a subscription. For more information, see our Terms and Conditions and Privacy Policy: https://www.nasm.org/policies/terms-and-conditions/nasm-app

Screenshots

Seconds Pro Interval Timer4 screens
NASM EDGE4 screens

Verdict

The call

The clearest difference is review sentiment: Seconds Pro Interval Timer at 80% against NASM EDGE's 9%. Seconds Pro Interval Timer also leads on rating (4.8 vs 2.9) and in-app purchases (none vs 6). NASM EDGE's advantage is price (Free vs $7.99) and iOS requirement (15.6 vs 18.0). On update cadence 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

NASM EDGE is free to download; Seconds Pro Interval Timer costs $7.99 up front. NASM EDGE sells 6 in-app purchases, starting at $19.99 per month. Seconds Pro Interval Timer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Seconds Pro Interval Timer holds the better App Store score, 4.8 against 2.9. That said, the two scores are not equally well evidenced: Seconds Pro Interval Timer has 12K ratings behind it against 236, so its average is the more settled of the two. Written reviews point the same way: 80% of Seconds Pro Interval Timer's written reviews are positive against 9% of NASM EDGE's.

UpkeepUpdate frequency

Seconds Pro Interval Timer ships an update fortnightly, NASM EDGE every 3 weeks. The most recent releases landed on October 17, 2026 and October 13, 2026 respectively.

Scorecard9 real differences · 2 level
Seconds Pro Interval Timer versus NASM EDGE: the parameters behind the verdict, then further details
ParameterSeconds Pro Interval TimerNASM EDGE
Price$7.99Free — better
Rating4.8 (12K ratings) — better2.9 (236 ratings)
Positive reviews79.7% of reviews — better9.4% of reviews
Number of ratings12K — better236
Update frequencyFortnightly — betterEvery 3 weeks
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaid — betterSubscription
Best chart rank#9 — better—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS18.015.6 — better
Further details — not scored
Size94 MB235 MB
Age rating4+4+
DeveloperRunloop LtdATI

Customer experience

Seconds Pro Interval Timer

All ratings12,104 ratings
Positive94.7%
Neutral1.9%
Negative3.4%
Written reviews1,520 reviews
Positive79.7%
Neutral6.0%
Negative14.3%

NASM EDGE

All ratings236 ratings
Positive38.1%
Neutral15.7%
Negative46.2%
Written reviews127 reviews
Positive9.4%
Neutral18.1%
Negative72.4%

User reviews

Seconds Pro Interval Timer

From 12K App Store ratings

What we love

  • ⭐ Great updates
  • 🤖 Amazing voice prompts
  • 👍 Easy to use
  • 🎨 Highly customizable
  • 🔧 Versatile for various workouts

Room to improve

  • 🐛 Occasional bugs and glitches
  • 🔌 Music volume issues
  • 🔍 Complicated setup for some features
  • 🌐 Sync/sharing issues between devices
  • 🔇 Inconsistent audio cues

NASM EDGE

From 236 App Store ratings

What we love

  • 🚀 Useful assessment features
  • 📈 Nutrition calculators
  • 💻 Ability to add own videos/exercises
  • 📝 Easy to add clients

Room to improve

  • 🐛 Buggy and crashes frequently
  • ⏱️ Slow exercise search and loading
  • 🤯 Frustrating to use, glitchy
  • 🔍 Limited exercise library
  • 💾 Issues saving/updating workouts

Bugs and requests

Seconds Pro Interval Timer

Reported bugs

4 issues
  • Intervals randomly pausing or skipping
  • Music volume issues when launching the app
  • Inconsistent audio cues and countdown
  • Sync issues between devices

Requested features

6 requests
  • Ability to lock Apple Watch screen
  • Option to see more than just the next exercise
  • Fractional time settings (e.g. 7.74 seconds)
  • More voice/audio customization options
  • Improved sync between iPhone and iPad
Show 1 more
  • Calendar integration to track workouts

NASM EDGE

Reported bugs

5 issues
  • Workouts disappearing after saving
  • Exercises not loading properly
  • Inability to edit/delete client information
  • Frequent login issues and app crashes
  • Unreliable syncing between app and web version

Requested features

6 requests
  • Add ability to create supersets and circuits
  • Allow clients to record weights/reps used
  • Integrate with fitness tracking apps
  • Add more exercise options, including basic movements
  • Improve workout editing and saving functionality
Show 1 more
  • Enhance search and filtering capabilities

In-app purchases

None

Seconds Pro Interval Timer

No in-app purchases

6 purchases

NASM EDGE

Subscriptions5
  • Trainer Plus (1 Month)$19.991 Month
  • Trainer Pro (1 Month)$34.991 Month
  • Trainer Quarterly Subscription$55.993 Months
Show 2 more
  • Trainer Plus (1 Year)$199.991 Year
  • Trainer Pro (1 Year)$349.991 Year
One-time1
  • CPT Exam Prep Package$16.99

Questions

Is Seconds Pro Interval Timer free?
Seconds Pro Interval Timer costs $7.99, with no in-app purchases.
Is NASM EDGE free?
NASM EDGE is free to download, with in-app purchases available.
Which has better reviews, Seconds Pro Interval Timer or NASM EDGE?
Seconds Pro Interval Timer is rated higher. Seconds Pro Interval Timer averages 4.8 out of 5 from 12K ratings, while NASM EDGE averages 2.9 from 236 ratings.
Do Seconds Pro Interval Timer or NASM EDGE have ads?
NASM EDGE shows ads; Seconds Pro Interval Timer does not.
Which is updated more often, Seconds Pro Interval Timer or NASM EDGE?
Seconds Pro Interval Timer ships an update fortnightly, and NASM EDGE every 3 weeks. Most recently, Seconds Pro Interval Timer was updated on October 17, 2026 and NASM EDGE on October 13, 2026.

Other comparisons