# Screencap

Screencap is a Chrome extension by Haris Muhibić for capturing, annotating and sharing screenshots, with on-device OCR. It has 232 users and a 5-star rating.

- Role: Founder, sole engineer
- When: February 2026 – present
- Status: Live, 232 users
- Stack: Chrome MV3, React, Tailwind, Tesseract.js (WASM), FastAPI, Postgres, Cloudflare Workers, Grafana
- Link: [screencap.app](https://screencap.app)

## What it is

Capture any part of a page, annotate it, make it presentable and share a link. Text recognition runs on your device, so screenshots never leave the browser just to read text from them.

## What I built

- A Manifest V3 extension in six languages.
- A FastAPI and Postgres backend for share links, with Google sign-in and separate API and file domains.
- An abuse policy with image moderation, plus Prometheus and Grafana monitoring.
- A landing site, blog and changelog on Cloudflare Workers.

## Engineering details

- **OCR bundle from about 54 MB to 13 MB:** I ship only the LSTM assets and pick the relaxed-SIMD, SIMD or plain WASM core at runtime.
- **Faster results:** the OCR worker warms up while you are still reviewing the capture, and a second pass runs only when the first result has low confidence.
- **Agent access by design:** a written architecture for a screen-recorder MCP server. Agents control recording through a native companion, and media bytes, file paths and tokens never cross the MCP boundary.

## Why it matters for clients

It shows what happens after launch: store review, users, moderation, monitoring and steady releases.

---
Haris Muhibić · chern0.dev · haris@chern0.dev · Book a call: https://calendar.app.google/qiN9zJrS5gSqQPky8