Plank Challenge vs OpenBox App
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 5-week structured plank program
- Progressive push-up training
- Daily workout instructions
- Progress tracking
- Apple Music integration
- Distraction-free interface
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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.
OpenBox App
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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
Verdict
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
Both are free to download. Plank Challenge sells 1 one-off in-app purchase. OpenBox App asks for nothing beyond the download.
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.
| Parameter | Plank Challenge | OpenBox App |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (470 ratings) — better | — |
| Positive reviews | 67.6% of reviews | — |
| Number of ratings | 470 — better | — |
| Update frequency | Every 3 weeks — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 17 MB | 67 MB |
| Age rating | 4+ | 4+ |
| Developer | Bo Kalvslund | Tecnologia 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
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- 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
Plank Challenge
- Plank Challenge Pro$0.99
OpenBox App
No in-app purchases
Questions
Is Plank Challenge free?
Is OpenBox App free?
Do Plank Challenge or OpenBox App have ads?
Which is updated more often, Plank Challenge or OpenBox App?
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