Comparison

Plank Challenge vs OpenBox App

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

Head to head
About

Plank Challenge

This app guides you through a 5-week program to build up to a 4-minute plank. It requires no equipment and can be done in just 4 minutes daily, with rest days incorporated for recovery. It also includes a bonus push-up progression.

Highlights
  • 5-week structured plank program
  • Progressive push-up training
  • Daily workout instructions
  • Progress tracking
  • Apple Music integration
  • Distraction-free interface
Features
Read full description

Hold a 4-minute plank in just 5 weeks – no gym, no equipment, only a few minutes a day. Plank Challenge is a proven, progressive program that takes you from beginner to a 4-minute plank, step by step. HOW IT WORKS - Train 4 days, rest 3 – your muscles get time to recover and grow stronger - Progressive plan designed to prevent injury - Clear daily instructions and progress tracking - Bonus: build from 1 to 100 push-ups at your own pace WHY PLANKS? Planks strengthen your abs, back and arms at the same time. They're one of the most effective bodyweight exercises for core stability and overall strength. FEATURES - 5-week structured program - Push-up challenge from 1 to 100 - Progress tracking - Apple Music integration – your music resumes automatically after each workout - Simple, distraction-free design FOR BEGINNERS AND RETURNERS Whether you're brand new or getting back into shape, the program meets you where you are. PRO - Ad-free - 4 premium themes - Trophy Room - Advanced statistics - Lifetime access – pay once Join 127,000+ people who have built a stronger core with Plank Challenge. Download now and see what you're capable of.

About

OpenBox App

Features
Read full description

Open Box 24/7 es tu aliado para entrenar sin excusas. Con nuestra innovadora app, ahora puedes realizar entrenamientos de crosstraining dónde y cuándo quieras, 24/7, los 365 días del año. Ya no hay barreras para alcanzar tus objetivos de fitness, ya que la app te permite acceder a rutinas y entrenamientos guiados por profesionales experimentados, sin importar tu ubicación. Nuestro espacio físico está ubicado en Arévalo 2915, Cañitas, CABA, Argentina, y cuenta con un salón de más de 100 m² equipado con todo lo necesario para entrenamientos libres. Sin embargo, entendemos que la vida moderna requiere flexibilidad, y es por eso que hemos desarrollado nuestra app para que puedas entrenar en cualquier lugar. Ya sea en casa, en el parque o mientras viajas, nuestra app te acompaña en cada paso de tu camino fitness. En Open Box 24/7, ofrecemos una variedad de clases para todos los niveles y objetivos. Nuestras clases de CrossTraining, HIIT Cardio y sesiones de Open Box están diseñadas para brindarte un entrenamiento completo y desafiante. Durante los horarios de clase, nuestros entrenadores altamente calificados y apasionados guían cada sesión, asegurando que obtengas el máximo beneficio de tu tiempo y esfuerzo. Desde nuestra fundación en marzo de 2022, hemos trabajado incansablemente para crear una comunidad de fitness inclusiva y motivadora. Nuestro objetivo es proporcionarte las herramientas y el apoyo necesarios para que puedas entrenar sin importar las limitaciones de tiempo o lugar. Únete a Open Box 24/7 y descubre cómo nuestra app y nuestras instalaciones pueden ayudarte a transformar tu vida, entrenando dónde y cuándo quieras.

Screenshots

Plank Challenge4 screens
OpenBox App4 screens

Verdict

The call

The clearest difference is in-app purchases: OpenBox App at none against Plank Challenge's 1. OpenBox App also leads on ads (none vs shown). Plank Challenge's advantage is update cadence (every 3 weeks vs every 3 months). On price, device support 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. Plank Challenge sells 1 one-off in-app purchase. OpenBox App asks for nothing beyond the download.

UpkeepUpdate frequency

Plank Challenge ships an update every 3 weeks, OpenBox App every 3 months. The most recent releases landed on October 16, 2026 and September 20, 2026 respectively.

Scorecard3 real differences · 7 level
Plank Challenge versus OpenBox App: the parameters behind the verdict, then further details
ParameterPlank ChallengeOpenBox App
PriceFreeFree
Rating4.7 (470 ratings) — better—
Positive reviews67.6% of reviews—
Number of ratings470 — better—
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS16.0 — better17.0
Further details — not scored
Size17 MB67 MB
Age rating4+4+
DeveloperBo KalvslundTecnologia y Desarrollo Informatico S.R.L.

Bugs and requests

Plank Challenge

Reported bugs

4 issues
  • App crashes after iOS 13 update
  • No times displayed after iOS 13 update
  • Audio mutes automatically between active and rest
  • App not running after iOS 13 update

Requested features

10 requests
  • Allow self-designed workouts
  • Integrate reminders
  • Add in-app music or motivational sounds
  • Provide explanation on different plank types
  • Include countdowns and motivational cues
Show 5 more
  • Suggest exercises for rest periods
  • Modern and minimalist design
  • Add a training plan for push-ups
  • Voice countdown for seconds
  • Dark mode option

OpenBox App

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Plank Challenge

One-time1
  • Plank Challenge Pro$0.99
None

OpenBox App

No in-app purchases

Questions

Is Plank Challenge free?
Plank Challenge is free to download, with in-app purchases available.
Is OpenBox App free?
OpenBox App is free to download, with no in-app purchases.
Do Plank Challenge or OpenBox App have ads?
Plank Challenge shows ads; OpenBox App does not.
Which is updated more often, Plank Challenge or OpenBox App?
Plank Challenge ships an update every 3 weeks, and OpenBox App every 3 months. Most recently, Plank Challenge was updated on October 16, 2026 and OpenBox App on September 20, 2026.

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