Borealis Builder

Borealis Builder is a free, open-source character builder for fifth-edition tabletop role-playing games. It guides players step by step through species, class, background, ability scores, proficiencies, feats and gear, and supports leveling from 1 to 20 with multiclassing. Ability scores can be rolled (3d6 or 4d6 drop lowest), bought with points or assigned from the standard array.

The app manages cantrips, spells, spellbooks, daily preparation and spell slots, including for multiclass casters. A Play tab tracks hit points, resources, short and long rests and exhaustion, and shows how values such as armor class and speed are calculated. Characters can be exported as printable PDF sheets in color or ink-saving styles, fillable or flattened, with spell pages and cards.

Borealis works with both the 2014 (SRD 5.1) and 2024 (SRD 5.2.1) rule sets, and only SRD rules content is bundled. Users can import Aurora Builder content, .dnd5e character files and local 5etools data. Everything stays on the device, with no account, ads or telemetry. An optional, desktop-only AI assistant can use the user's own Claude or Codex command-line tool for rules questions and homebrew conversion.