OpusPad

Review and edit local Markdown files in Chrome. WYSIWYG + source mode. 100% private, zero uploads. Built for AI-indigenous builders.

As of June 2026, OpusPad has 16 users in the Developer Tools category.

Developer Tools

Chrome Web Store ↗.crx

Users+166.7%

Rating0%

—

— reviews

Reviews0%

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Version

1.3.1

Manifest V3

90-day change · In the last 90 days this extension 2 version updates.

History

9 snapshots

Tracking since Apr 1, 2026.

View as table

Date	Users	Rating	Reviews	Version
Apr 1, 2026	6	—	—	1.2.2
Apr 10, 2026	7	—	—	1.2.2
Apr 20, 2026	10	—	—	1.2.2
Apr 25, 2026	12	—	—	1.3
May 14, 2026	13	—	—	1.3
May 20, 2026	12	—	—	1.3
May 26, 2026	14	—	—	1.3
Jun 2, 2026	13	—	—	1.3
Jun 8, 2026	14	—	—	1.3.1
Now	16	—	—	1.3.1

Permissions & access

Permissions: None declared
Host access: None declared

Screenshots

About

HOW TO USE: Open OpusPad by clicking its icon in your browser toolbar, then click 'Open Folder' to select your project directory and start editing.

In AI-assisted development, specs are no longer optional notes—they are working artifacts. Agents read specs, generate plans, update task lists, and write implementation notes. Spec-driven development only works if those files stay readable and editable.

Agents can draft the code, but humans still need to inspect, refine, and trust the artifact. OpusPad sits in the sweet spot for this review loop: it’s a browser-native, local-first editor purpose-built for reading and editing the Markdown files already in your repository.

KEY FEATURES:

• WYSIWYG Editor — Review specs and generated plans without the overhead of raw Markdown noise. Tables, code blocks, and lists render cleanly.

• Source Mode — Drop down to raw Markdown for precise edits when structure and document formatting matter.

• External Change Detection — When an AI agent updates your project tracker or CLAUDE.md on disk, OpusPad detects the change and reloads instantly to keep you in sync.

• Local File Access — Work directly with your repo artifacts. Read and write directly using Chrome's native File System API.

• Auto Save — Your edits persist to disk automatically. Refine a spec and your agent immediately sees the updated file.

• Directory Sidebar — Browse your project's spec folders. Smart fuzzy search lets you jump between design docs and implementation notes instantly.

• 100% Local & Private — Your sensitive specs and proprietary code never leave your machine. Zero telemetry, zero cloud sync, zero data collection.

• Lightweight — Optimized for quick review loops, not general note-taking fluff. Runs natively inside Chrome without Electron overhead.

PERFECT FOR:
- Writing and refining architecture specs
- Reviewing agent-generated plans and task files
- Editing implementation notes and CLAUDE.md rulesets seamlessly
- Keeping everything strictly local and repo-native