旁注 Marginalia
Your own local Claude in the Edge sidebar — summarize, translate, compare pages, read images, and search the web, all on your own subscription.
Uses your Claude. Nothing is routed through us.
MoonStack · Local-first tools
Tools that stay on your machine.
MoonStack builds small, focused tools — Edge extensions and a trading journal — that each do one job well and keep your data on your side of the screen. No accounts, no uploads, no subscriptions.
Local-first
Processing happens in your browser, not on a server.
No accounts
Nothing to sign up for. Install and use.
Nothing uploaded
Your files, pages, and screenshots never leave the device.
One-time Pro
Where there's a paid tier, you buy it once. No subscriptions.
Browser tools
Five Edge extensions.
// runs locally · minimal permissions
PrivaSnap
Capture the visible area, a region, or a full page, then annotate with arrows, boxes, and text and save as PNG — entirely in your browser.
No screenshot is ever uploaded.
PDFMark
Highlight, underline, and annotate PDFs in a local viewer — arrows, boxes, and notes. No upload, no account.
Your PDF never leaves the tab.
ReddiSense
Real-time Reddit sentiment for any stock ticker, scored bullish or bearish, with the top posts — right in the side panel.
Pro adds more posts and an AI summary on your own API key.
FilingLens
Decode the latest insider (Form 4) trade into plain language, and redline what management changed between two 10-Q filings — pulled straight from SEC EDGAR, parsed locally.
Form 4 and a preview are free; the full 10-Q redline is one-time Pro.
Who makes this
MoonStack
since 2015
A small studio.
MoonStacksince 2015
MoonStack is a small independent studio. We make browser extensions that are deliberately narrow: one job, done locally, asking for as few permissions as the job allows.
Where a tool has a paid tier, it's a one-time purchase — buy it once, own it. No subscriptions, no telemetry, no ads, no remote code.
Questions, bug reports, and feature requests go straight to a human: mumu@moonstack.org