Repository terms
The repository's LICENSE file contains the published terms. Review those terms and any third-party licenses before distributing or hosting a modified version.
Open Source
Built in the open. Free forever. By design.
DURA's source and learning materials are published on GitHub. Read the license included with the version you use for its terms.
Durwood Studios commitment
DURA's core lessons and learning tools are free. Voluntary tips do not unlock features. This is our product commitment, separate from the source license.
Source access and free learning
Open-source licenses describe rights and obligations for using, modifying, and sharing software. They do not by themselves guarantee a zero-price hosted service.
Keeping DURA's core learning free is a commitment from Durwood Studios. Other operators may offer paid hosting or services under the applicable license terms.
How to contribute
DURA welcomes contributions of every size — from a typo fix to a whole new dictionary term.
- Content: add or improve a lesson, dictionary term, or assessment question. Every MDX file lives under
src/content/and follows a documented frontmatter schema. - Code: pick up a
good-first-issuelabel on GitHub. The repo runs ESLint, TypeScript strict, and a pre-commit hook so CI catches mistakes before you do. - Translations: DURA is English-first. If you want to lead a localization effort (Spanish, Portuguese, Japanese, or your language), open an issue.
- Reviews and bug reports: read a lesson, spot something wrong, open an issue. That's a contribution.
Architecture at a glance
- Next.js 16 App Router, React Server Components, static generation for lessons and dictionary terms
- TypeScript strict throughout, zero
any - Tailwind v4 with CSS variable tokens for theming
- IndexedDB via idb — local learning records, with optional account sync to Supabase
- FSRS-5 spaced repetition, implemented from scratch (no external dep)
- Sandpack for in-browser code execution, lazy-loaded so the initial bundle stays small
- Zustand for cross-component state, no Redux/MobX
- Optional learning analytics — off by default; opted-in events can sync to Supabase as described in the privacy policy
Where we are on the roadmap
- Infrastructure · routes, IDB, API, theme · shipped
- Lesson pipeline · MDX, reader, interactive components · shipped
- Review, sandbox, dictionary · shipped
- Assessments, mastery gates, certificates · shipped
- Goals, gamification, study modes · shipped
- Marketing pages, TipButton (Stripe tips) · shipped
- Teacher dashboard and export engine · next
- Content sprint — all 749 lessons and 500 dictionary terms · after
- Polish, PWA, accessibility audit, launch · last
Contributors
DURA is new. The contributors wall is waiting for its first entry. Yours could be it.
Dustin Snellings · founderYour name here