LanguageBridge

LanguageBridge helps K-12 English learners understand grade-level schoolwork. A student selects text on any webpage and gets it in their home language, with read-aloud audio and a simple-English aid for academic terms. A two-way voice feature, Talk to Teacher, lets a student and teacher talk across two languages.

It is a Chrome extension (extension/) and a web app at languagebridge.app, both backed by Azure Functions (backend/). Students never create accounts and no student identity is stored.

Start here

docs/MASTER-DOCUMENT.md is the single current reference: what is built, the function and API reference, data, privacy rules, setup, testing, deployment, decisions, history and roadmap.

If you need	Go to
How it works, and how to run and test it	docs/MASTER-DOCUMENT.md
What changed recently	docs/dev-notes/
Facts we may state to customers, pricing, the DPA	company/, starting with 00-CANONICAL-FACTS.md
Compliance plans	docs/compliance/
Specs for what is not built yet	docs/PRD-ADMIN-DATABASE.md, docs/PRD-ML-FLYWHEEL.md, company/PROVISIONING-AND-LICENSING.md
Every API request and response shape	backend/shared/types.ts

Quick start

npm install                 # repo root
npm run test:backend        # backend tests, no credentials needed
npx vitest run              # root unit and integration tests

To run the backend locally or load the extension in Chrome, follow sections 11 and 12 of the master document. Read the warning there first: local development uses the production database.

Repo layout

Path	What it is
backend/	Azure Functions (TypeScript). The production system
extension/	Chrome extension, Manifest V3
deliverables/	Chrome Web Store copy and the Talk to Teacher web hand-off package
ml-pipeline/	Voice training and inference research. Not deployed
data/	Glossary seed data and the standards pipeline
scripts/	Deploy and data-loading scripts
tests/	Root Vitest suites
docs/, company/	Documentation

Rules that do not bend

1. Never store student PII. Students are pseudonymous codes only.
2. Only student-written text enters the flag pipeline, never Azure output.
3. Service keys stay server-side, never in a public web page.
4. Missing configuration fails loudly. No silent defaults.

The reasoning is in section 7 of the master document.

Team

• Justin Bernard — CEO, backend. [email protected]
• Prentice Howard — front end, extension

Proprietary. Copyright 2026 LanguageBridge LLC. All rights reserved.