Choose the way you play.
HD4K Play Free gives you the essentials, and HD4K Play Pro is $12.99/month for the complete research experience. We’re currently offering free early access to every tool before subscriptions open.
HD4K Play Free
$0 / MONTHEverything you need to start testing and sharing strategies, with a permanent free way to enjoy HD4K Play.
- HD Dice, HD Mines and calculators
- Manual, Auto and Advanced Play
- Basic saved strategies and gameplay analytics
- Leaderboards, strategy links and Community Library
HD4K Play Pro
FULL RESEARCH SUITEEverything in Free, plus deeper testing, professional research tools, and premium presentation features.
- Monte Carlo, Strategy Arena, Risk Engine and Stress Lab
- Heatmaps, Optimizer, Robustness and Strategy DNA
- Research Notebook, advanced analytics and reports
- Replay Studio Pro and premium profile themes
- 72-hour introductory Pro trial at launch
Your saved research stays with you.
When your 72-hour Pro trial ends, your account will return to Free unless you choose to subscribe. Your saved strategies, notes and recorded tests will remain in your account. Even if you return a month later, subscribing to Pro will restore access to your saved Pro research without requiring you to start over. Research retention is subject to the published account and data-retention terms.
Nothing changes today: membership settings do not restrict research access, erase saved work or trigger a bill. You can browse the Help Center without an account.
Read the Free vs. Pro comparison →