Licenses

Last updated: July 25, 2026

Mostrel is built on other people’s work. This page credits it and keeps the license texts where you can actually read them, which is both the polite thing and the required thing.

Typefaces

These are served from our own servers rather than a font CDN — see the subprocessor list for why. That makes us a redistributor, so each font’s license travels with it here, in full and unmodified.

Instrument Sans

OFL-1.1

Body and interface text.

Read the license Project source

Instrument Serif

OFL-1.1

Display headlines and the editorial italics.

Read the license Project source

JetBrains Mono

OFL-1.1

Slugs, timestamps, and metadata.

Read the license Project source

Software

The significant pieces, grouped by license. This is a readable summary rather than a machine-generated inventory — the full dependency tree, pinned to exact versions, lives in the lockfile in our repository.

MIT

React — The UI runtime
TanStack Router & Start — Routing and the server-function layer the whole app is built on
Tailwind CSS — Every style in the design system
Better Auth — Sign-in, sessions, and the GitHub OAuth flow
Zod — Schema validation — the contract every block config is checked against
unified, remark & rehype — Markdown parsing and the HTML sanitizer that makes published text safe
node-postgres — The PostgreSQL driver
Vite, Wrangler & Vitest — Building, deploying, and testing

Apache-2.0

Drizzle ORM — Database schema and queries
React Aria Components — Accessible menus, dialogs, and the drag-and-drop block list

MPL-2.0

Used unmodified. Their source is public at the links below; if we ever change these files, our changes have to be published too.

Satori — Turns the link-preview card into SVG
resvg — Rasterizes that SVG into the PNG that unfurls in Slack and X

ISC

Lucide — The icon set

Things we may add

Two are on the roadmap and will be credited here in the same release that ships them: a rich-text editor for prose blocks (the candidates, TipTap and Lexical, are both MIT), and a payment provider’s SDK once paid plans exist. If either choice drags in a license with real obligations, it gets its own entry rather than a line in a list.

Something missing?

If your work is in here and credited wrongly — or not credited at all — tell us at legal@mostrel.com and we’ll fix it quickly. We would much rather over-attribute than under-attribute.