Comparison

Interval Timer for HIIT | Cero vs EPSTremor

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

Head to head
About

Interval Timer for HIIT | Cero

This interval timer app enhances various workouts like HIIT, Tabata, and yoga with intuitive design and customizable timer modes. Create and save custom intervals, track calorie expenditure, and sync settings across devices, including Apple Watch.

Highlights
  • Customizable interval timers
  • Simple and advanced timer modes
  • Create and save multiple workout settings
  • Apple Watch compatibility with heart monitor
  • Automatic calorie tracking to Apple Health
  • Cross-device sync
Features
Read full description

Build an interval workout around the way you train. Cero is a flexible interval timer for HIIT, Tabata, circuit training, WODs and HYROX preparation. Set up a quick work/rest timer or program each interval in detail. Distinct colors, large controls and reliable cues keep you focused on the session instead of the clock. BUILD YOUR SESSION • Set work, recovery, sets, warm-up and cool-down. • Create advanced workouts with custom intervals, colors, icons and intensity levels. • Save, duplicate and reorder timers. • Share timers by file or QR code. • Review completed sessions in workout history. STAY IN THE WORKOUT • Follow compatible sessions with Live Activities and Dynamic Island. • Start saved or recent timers from Home Screen widgets. • Use Siri and Shortcuts to start, pause, resume and stop a timer. • Put Gym Display on a larger screen or mirrored TV. • Choose a default song or assign music to individual intervals. • Customize sounds, voice cues, vibrations and background alerts. TRAIN BY HEART RATE Adaptive HR can extend recovery until you reach your target heart rate, then guide hard efforts with low and high alerts. Pair a Bluetooth heart-rate monitor with iPhone or train with heart-rate data from Apple Watch. COUNTDOWN AND STOPWATCH The built-in countdown and lap stopwatch cover warm-ups, station changes, rest periods and race-day practice. Stopwatch sessions continue after you close and reopen the app. ON APPLE WATCH Run saved workouts from your wrist, follow heart rate and use the standalone countdown and stopwatch. Cero can save completed workouts and estimated calories to Apple Health. Automatic iCloud backups help protect saved timers and custom intervals. Useful for HIIT, Tabata, circuits, EMOM-style workouts, boxing rounds, strength and conditioning, indoor cycling, running intervals and hybrid race preparation. Feedback and suggestions: hi@flawless.studio Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

EPSTremor

Features
Read full description

AVISO IMPORTANTE: Esta aplicación es estrictamente para fines de entretenimiento, educación y autoexploración. NO es un dispositivo médico, NO diagnostica enfermedades ni afecciones, y NO sustituye el consejo de un profesional de la salud. EPS Tremor es una aplicación curiosa y educativa diseñada para que puedas medir y analizar la estabilidad de tus manos y brazos. Utilizando los sensores de movimiento (acelerómetro) integrados en tu dispositivo iOS, la app registra las pequeñas vibraciones naturales que todos tenemos en el cuerpo. ¿Tienes un pulso firme de cirujano o te tiemblan las manos después de tomar mucho café? ¡Ponlo a prueba! CARACTERÍSTICAS PRINCIPALES: Modos de Prueba: Mide tu estabilidad en dos posturas diferentes: con la mano relajada (Reposo) o con el brazo extendido frente a ti (Mano Extendida). Retos de Tiempo: Selecciona la duración de tu prueba (15, 30 o 60 segundos) y trata de mantenerte lo más inmóvil posible. Visualización en Vivo: Observa la forma de onda de tus micromovimientos en tiempo real mientras intentas mantener el pulso firme. Métricas de Estabilidad: Al finalizar, la app analiza tus datos y te muestra estadísticas fascinantes sobre tu movimiento: Frecuencia del movimiento (Hz) Intensidad de la vibración Nivel de estabilidad general. Historial Personal: Guarda tus resultados para ver si tu pulso es más firme por las mañanas, después de hacer ejercicio, o compáralo con tus amigos. Exportación: Exporta tus datos a formato CSV si te gusta analizar gráficos o por simple curiosidad técnica. Descubre los ritmos invisibles de tu cuerpo con EPS Tremor.

Screenshots

Interval Timer for HIIT | Cero4 screens
EPSTremor4 screens

Verdict

The call

The clearest difference is in-app purchases: EPSTremor at none against Interval Timer for HIIT | Cero's 2. EPSTremor also leads on ads (none vs shown). Interval Timer for HIIT | Cero's advantage is update cadence (every 3 days vs every 3 weeks) and device support (3 vs 1). On price and iOS requirement 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 for HIIT | Cero sells 2 in-app purchases, starting at $2.99 per month. EPSTremor asks for nothing beyond the download.

UpkeepUpdate frequency

Interval Timer for HIIT | Cero ships an update every 3 days, EPSTremor every 3 weeks. The most recent releases landed on October 20, 2026 and October 10, 2026 respectively.

Scorecard4 real differences · 6 level
Interval Timer for HIIT | Cero versus EPSTremor: the parameters behind the verdict, then further details
ParameterInterval Timer for HIIT | CeroEPSTremor
PriceFreeFree
Rating4.7 (436 ratings) — better—
Positive reviews74.6% of reviews—
Number of ratings436 — better—
Update frequencyEvery 3 days — betterEvery 3 weeks
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple Watch — betteriPhone
Requires iOS16.0 — better17.0
Further details — not scored
Size42 MB2 MB
Age rating4+4+
DeveloperFlawless Studio LLCSergio Iglesias Parro

Bugs and requests

Interval Timer for HIIT | Cero

Reported bugs

4 issues
  • App runs in background draining battery
  • Rotation broke after update
  • Apple workout app overrides Cero app on Apple Watch
  • Interval signals too weak or not working

Requested features

5 requests
  • Ability to group timers
  • Option to add warm-up and cool-down features
  • Ability to type numbers for time adjustment
  • Timer sounds through headphones or interrupting music
  • Ability to change exercise names

EPSTremor

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Interval Timer for HIIT | Cero

Subscriptions1
  • Cero Pro Monthly7 Days trial$2.991 Month
One-time1
  • Cero Pro$14.99
None

EPSTremor

No in-app purchases

Questions

Is Interval Timer for HIIT | Cero free?
Interval Timer for HIIT | Cero is free to download, with in-app purchases available.
Is EPSTremor free?
EPSTremor is free to download, with no in-app purchases.
Do Interval Timer for HIIT | Cero or EPSTremor have ads?
Interval Timer for HIIT | Cero shows ads; EPSTremor does not.
Which is updated more often, Interval Timer for HIIT | Cero or EPSTremor?
Interval Timer for HIIT | Cero ships an update every 3 days, and EPSTremor every 3 weeks. Most recently, Interval Timer for HIIT | Cero was updated on October 20, 2026 and EPSTremor on October 10, 2026.

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