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There are search filters that are very handy, monsters that you can scale their Challenge Rating (CR), create character backgrounds, deities and demigods, hereos, adventures, maps, customizable Player's and Dungeon Masters Screen, yet so much more.
D&D works great on phones, laptops and tablets.
No account needed. Settings are stored in your cookies - your computer, tablet, etc. If you clear your browser cache, those browser cookies are deleted, your saves and settings are deleted too.
DnDink One D&D is for archiving and educational purposes, accessible digital reference for products you already own.