TimerFlex vs Interval Timer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TimerFlex
This app uses AI to instantly create custom workout timers from whiteboard photos or text descriptions. It offers various pre-built formats, real-time heart rate tracking, and detailed workout history. Advanced features like Apple Watch sync and unlimited AI generation are available with a subscription.
- AI workout generation from photos/text
- Apple Watch sync with haptic cues
- Real-time heart rate and calorie tracking
- 5 purpose-built workout formats (For Time, AMRAP, EMOM, Tabata, Custom)
- 1RM calculator
- Voice coach and audio cues
- Workout history and monthly stats
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TIMERFLEX – INTERVAL & WOD TIMER The smartest workout timer for serious athletes. Snap a photo of any whiteboard. Describe your session in plain text. TimerFlex builds the entire workout — rounds, intervals, rest — instantly with AI. ——— AI WORKOUT GENERATOR Point your camera at a gym whiteboard or type your workout. AI reads it and sets up the complete timer in seconds. No programming. No fumbling. Just press go. APPLE WATCH SYNC Full timer on your wrist the moment you start. See rounds, phases, and time remaining without touching your phone. Haptic cues keep you on pace. Start and pause from your wrist. REAL-TIME HEART RATE & CALORIES Live BPM and active energy during every session via HealthKit. Know exactly how hard you're working without leaving the timer. 5 PURPOSE-BUILT FORMATS Not a generic countdown. Each format knows exactly what it's doing: • For Time — race the clock, finish as fast as possible • AMRAP — maximum rounds in a fixed window • EMOM — new movement every minute, automatically • Tabata — 20s work, 10s rest, 8 rounds, handled • Custom — chain any combination into one session No manual resets. No counting rounds in your head. TimerFlex handles all of it. 1RM CALCULATOR Built into every setup screen. Enter your max and get instant percentage breakdowns for every lift. VOICE COACH & AUDIO CUES Countdown calls, phase announcements, halfway alerts. Eyes on your reps, not your screen. LARGE DISPLAY & LANDSCAPE MODE Numbers big enough to read from across the gym. Rotate for maximum visibility mid-set. WORKOUT HISTORY & MONTHLY STATS Every session logged automatically with mood, duration, and notes. Monthly Wrapped gives you your longest streak, total time, and favorite format so you can see your training compound over time. SAVE, FAVORITE & REBUILD Save any workout as a template. Favorite your go-to sessions. Retry any past workout in one tap. NOTES & PHOTO ATTACHMENTS Attach whiteboard photos or text notes to any session. Your workout context, always with your data. EXPORT & BACKUP Export your full history as CSV or JSON. Your data, your way, always portable. ——— BUILT FOR • CrossFit WODs & box sessions • HYROX training blocks • HIIT & interval circuits • Tabata (20s work / 10s rest) • EMOM (Every Minute on the Minute) • AMRAP (As Many Rounds As Possible) • Home gym, garage & travel workouts • Benchmark WODs: Murph, Cindy, Fran ——— TIMERFLEX PRO Unlock unlimited AI Generator, Custom Workout Builder, premium voices and sounds, heart rate insights, Monthly Wrapped, photo notes, workout export, Apple Watch sync, and zero ads. Monthly · Quarterly · Annual — your choice. ——— Privacy Policy: https://plainworks.co/timerflex/privacy-policy Terms of Use: https://plainworks.co/timerflex/terms
Interval Timer
This app provides a flexible and intuitive timer for various training routines, including HIIT, circuit, and boxing. It offers clear audio and visual cues to guide users through work and rest intervals, with options for custom sequences and workout history review. Upgrade to Pro for advanced features and unlimited timers.
- Customizable work and rest durations
- Multiple rounds and sets configuration
- Preparation, break, and cool-down timers
- Named intervals and custom sequences
- Audio, vibration, and spoken guidance
- Workout history and calendar view
- Quick-start presets and saved routines
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Interval Timer: Circuit & HIIT is a clean, flexible training timer built to keep every workout moving. Set up a session in seconds, follow clear cues while you train, and stay focused on the next interval instead of the clock. BUILD CIRCUIT AND HIIT WORKOUTS * Set work and rest durations * Choose the number of rounds and sets * Add preparation time, breaks between sets, and a cool-down * Create custom sequences with individually named intervals * See the total session time before you begin FOLLOW EVERY PHASE * Use sound, vibration, and spoken phase guidance * Enable countdown and halfway alerts * See the current phase, remaining time, round, and set at a glance * Pause, resume, or move between workout phases when needed START FAST * Begin with ready-to-use quick-start presets * Save named timer setups for routines you repeat * Adjust your timer without navigating through complicated menus REVIEW YOUR TRAINING * Browse completed workouts on a calendar * Filter your history by week, month, or all time * Review workout count, total training time, and completed rounds MADE FOR YOUR ROUTINE Use Interval Timer: Circuit & HIIT for HIIT, Tabata, circuit training, boxing, running, cycling, stretching, mobility work, home workouts, study sessions, or any activity that alternates focused effort and recovery. Simple controls, clear feedback, and flexible timing help you spend less time setting up and more time doing the work. INTERVAL TIMER PRO Upgrade to Pro for unlimited custom timers, advanced interval training, audio coaching, screen-lock training, music support, and saved workouts. Subscription Instructions: Interval Timer Pro includes auto-renewing subscriptions. Payment will be charged to your iTunes account. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Manage or cancel anytime in Account Settings. Free trial eligibility may apply. Refunds follow Apple policies. We'd love to hear from you! Feedback & Support: sps-team@needodo.com Privacy Policy: https://api-cle.needodo.com/acchtml/timer/privacy.html Terms of Service: https://api-cle.needodo.com/acchtml/timer/terms.html
Screenshots
Verdict
The clearest difference is review sentiment: TimerFlex at 100% against Interval Timer's 0%. Interval Timer's advantage is rating (5.0 vs 3.0) and ads (none vs shown). On price, ratings volume, update cadence and in-app purchases 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
Both are free to download. TimerFlex sells 10 in-app purchases, starting at $1.49 per 7 days and Interval Timer sells 3 in-app purchases, starting at $9.99 per 7 days. Whichever you choose, the download price is not the number that matters.
Interval Timer holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews complicate that: 100% of TimerFlex's written reviews are positive against 0% of Interval Timer's, so the app with the better star average is not the one people write more warmly about.
Both ship on a similar rhythm, roughly weekly. The most recent releases landed on November 8, 2026 and November 13, 2026 respectively.
| Parameter | TimerFlex | Interval Timer |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 2 — better | 1 |
| Update frequency | Weekly | Weekly |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, Apple Watch — better | iPhone, iPod |
| Requires iOS | 26.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 101 MB | 38 MB |
| Age rating | 12+ | 12+ |
| Developer | Plainworks Teknoloji Limited Sirketi | ShenZhen Niddles Technology Co., Ltd. |
Customer experience
TimerFlex
Interval Timer
In-app purchases
TimerFlex
- TimerFlex Weekly$1.497 Days
- TimerFlex Weekly$2.197 Days
- TimerFlex Monthly$3.491 Month
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- TimerFlex Pro Monthly1 Month trial$3.491 Month
- TimerFlex Quarterly$8.493 Months
- TimerFlex Annual$12.991 Year
- TimerFlex Annual3 Days trial$24.991 Year
- TimerFlex Annual$24.991 Year
- TimerFlex Ad-Free$0.99
- TimerFlex Lifetime$24.99
Interval Timer
- Weekly Subscription3 Days trial$9.997 Days
- Monthly Subscription$19.991 Month
- Yearly Subscription7 Days trial$59.991 Year
Questions
Is TimerFlex free?
Is Interval Timer free?
Which has better reviews, TimerFlex or Interval Timer?
Do TimerFlex or Interval Timer have ads?
Which is updated more often, TimerFlex or Interval Timer?
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