Bookmarklet
shippedOne click from any page in any browser. Opens a small window, offers a note, closes itself. Deliberately not the full app.
Any browser, signed in or not yet
Stage one — capture
Eight ways in.
One inbox.
The premise is that you should never have to open the app to save something. Every path lands in the same inbox and deduplicates against everything already there.
Five of the eight are shipped and covered by tests. Three are designed and not built.
The pathsSaving a link should be instant,
Saving a link should be instant,
from wherever you happen to be reading.
A browser extension is one answer to capture. It is not eight, and the six things you meant to keep from your phone on Tuesday are the ones that get lost.
Save from a chat message
shippedPost a link in a designated Chirp channel and it is captured — with the sentence you wrote around it kept as the note.
Chirp, the fleet's chat
Ask an assistant to save it
shippedClaude, or any MCP client, can capture links on your behalf, with the reason attached.
Model Context Protocol
Watched feeds
shippedFollow an RSS or Atom feed and new entries arrive as suggestions, in their own lane. They never enter your inbox until you say so — the inbox stays “things I chose,” which is what keeps triage fast.
RSS and Atom
A key for scripts and Shortcuts
shippedA named, revocable key for Shortcuts, Raycast, Alfred or curl. It can only capture — it cannot read your inbox and it cannot send anything.
Anything that can make an HTTP request
Share sheet on your phone
comingWill share from Safari, X, your feed reader or Mail — anything that shares a URL. It will work offline and sync when the network returns, so nothing saved is lost to a dead signal.
iOS and iPadOS, with the native app
Forward it by email
comingA private address of your own. Forward a newsletter and every link in it will be captured, with the text above the first link kept as the note.
Any mail client
Browser extension
comingA keyboard shortcut and a right-click menu, for people who would rather not use a bookmarklet.
Desktop browsers
shipped running and covered by tests
building specified and in progress
coming designed, not started
The quiet featureThree arrivals.
Three arrivals.
One item.
The same article coming from a share sheet, a feed and a friend's message is one item with three arrivals recorded — not three near-identical rows you have to reconcile on Saturday morning.
- Tracking parameters are stripped per host. The campaign tag a link picked up on its way to you is not part of what the link is.
- Shorteners are followed. A short link and the page it points at are the same page.
- Near-duplicates are offered, never merged. Two different URLs telling the same story come back as a suggested merge you approve, because sometimes they are genuinely two pieces.
- Every arrival keeps its note. Merging does not throw away the sentence you wrote the second time; it is often better than the first.
One item, three arrivals
___PRESERVE_BLOCK_7___
And then
Every link arrives legible.
Capture never waits on the fetch. The title, author, publication, date, standfirst, hero image, language and reading time are pulled in the background, and the article's own text comes with them.
Reader view
The article's text, stripped of navigation and subscribe-nags, so you can judge something without leaving Curio or hitting the paywall twice.
Posts and videos too
X, YouTube, Vimeo, Bluesky and Mastodon are read through their own metadata rather than scraped, because their pages are shells.
A paywall does not lose the link
When a page cannot be read, the item survives with its URL, your note, and a plain explanation of what happened. It is still perfectly usable — you often know exactly what it was.
Tags, suggested
Lightweight automatic tagging on capture, editable and never binding.
Triage, compose, draft, publish, measure → · The full feature list →
Keep the good bits.
Send them Saturday.
Curio does the half of a newsletter that is not sending: capturing, triaging, drafting, assembling, reviewing. Herald owns the subscribers, the opt-in, and the send.
Curio is in active development at Renkara. Nothing here is for sale yet and there is no list to join — write to contact@renkara.com if you want to hear when it opens.
Claude and the Model Context Protocol are trademarks of Anthropic, PBC. Apple, iPhone, iPad, iOS, iPadOS, Safari, Shortcuts, and Mail are trademarks of Apple Inc. X is a trademark of X Corp. Raycast is a trademark of Raycast Technologies Inc. Alfred is a trademark of Running with Crayons Ltd. YouTube is a trademark of Google LLC. Vimeo is a trademark of Vimeo, Inc. Bluesky is a trademark of Bluesky Social, PBC. Mastodon is a trademark of Mastodon gGmbH. Curio is not affiliated with, endorsed by, or sponsored by any of them.