Velt×
MonacoAdd comments and co-editing to Monaco, the editor behind VS Code, for your users and your AI agents. Threads stay pinned to the line as the buffer changes, and every agent edit lands as a suggestion your users approve, so a review on a function stays on that function as the file grows.
Free tier. No credit card. First comment in 5 minutes.
The Q3 campaign centers on the migration storyHope: moving from async reviews to live collaborationEthan. Pricing: three usage tiers from $0, no per-seat cost.
live cursors + a comment anchored to the selection · Yjs merges every keystroke
The problem
Your users expect to comment and co-edit in Monaco, and your AI agents need that same buffer with a human approving before they touch user work. Comments that survive Monaco's model changes are a multi-quarter build, and the moment anchoring breaks, feedback lands on the wrong line. Co-editing is the harder half: rolled by hand it means overwrites, lost work, and merge conflicts, the "my changes disappeared" bug reports, plus a websocket fleet and offline merge to keep alive. And the harder question is your agents: a useful agent needs to change the work, but an agent with write access to user content is what your buyers' security review blocks, so without a consent step you choose between an agent that is useful and an agent that is safe. Every quarter spent on this is a quarter not spent on your own product.
Velt is the review and collaboration layer built for Monaco: your users and your AI agents work the same buffer, with comment threads anchored to the line, and every agent suggestion is a change a human approves before it lands.
Features
Clause 7 omits a liability cap. Suggested fix attached.
// An agent posts a suggestion as a first-class user.
await velt.comments().add({ author: agent, suggestion });
// On approve, the change fires through your webhook.Your AI agent comments and suggests on the buffer as a first-class user; a human approves or rejects, and on approve the change fires through your webhook with a permanent record.
@Maya pulled into the thread
2 Repliesimport { VeltComments } from "@veltdev/react";
<VeltComments textMode />Threaded comments inline on lines and selections, in the editor and the diff view, with replies, @mentions, reactions, and attachments.
Tiptap
Lexical
CodeMirror
BlockNote
React Flowplus the core library for your own editor, whiteboard, or grid
import { useVeltCrdtExtension } from "@veltdev/tiptap-crdt-react";
const extension = useVeltCrdtExtension({ editorId });Conflict-free co-editing on the model.
import { VeltPresence, VeltCursor } from "@veltdev/react";
<VeltPresence />
<VeltCursor />Live named cursors and selections in the buffer.
Suggested a tighter figure on the rate line.
// Propose changes reviewed like a diff.
<VeltComments suggestionMode />Propose changes as accept-or-reject suggestions, reviewed like a diff.
Maya mentioned you on Q3 forecastmention
“@you can you review before Friday?”
Sarah replied on the Q3 threadreply
forecast.xlsx · cell B12
Ethan requested your sign-offsign-off
contract.pdf · due today
import { VeltNotificationsTool } from "@veltdev/react";
<VeltNotificationsTool />In-app, email, and Slack alerts on every comment and @mention.
voice note · pinned to this cell
“The variance comes from the vendor rate change, see row 18.”
import { VeltRecorderControlPanel } from "@veltdev/react";
<VeltRecorderControlPanel />Pin a quick voice, screen, or video clip in context on the buffer.
await velt.versions().save({ name: "Draft v3" });
await velt.versions().restore({ id });Named checkpoints on the file, saved and restored by API.
const log = await velt.activities().get({ documentId });Every review on the file, exportable.
TiptapLexicalCodeMirrorBlockNoteReact Flowplus the core library for your own editor, whiteboard, or grid
<VeltProvider singleEditorMode>
{/* one editor instance */}
</VeltProvider>Run Velt review on a single editor instance without multiplayer.
a code-review agent flags a bug or style issue on the exact line and proposes the fix as a suggestion; your user approves or rejects it like a pull request, and on approve the change fires through your webhook with a permanent record of who allowed what.
Setup
npm install @veltdev/react @veltdev/monaco-crdt-reactimport { VeltProvider } from "@veltdev/react";
<VeltProvider apiKey={API_KEY}>
<App />
</VeltProvider>// Mount Velt on Monaco
<VeltComments />
// + the CRDT adapter for co-editingWhy Velt
Liveblocks syncs people and agents into your app's state; Velt adds the step Liveblocks does not, every agent change on Monaco is a suggestion your user approves or rejects, on the record.
Enterprise
The controls your buyers' security reviews ask for, in writing.
Adding Velt to Monaco does not move that surface's content off your stack. Per-feature data providers keep comment content, attachments, and user PII on your own infrastructure; Velt stores only minimal identifiers.
FAQ
Both. Velt adds threaded comments and conflict-free co-editing on the same Monaco instance.
Yes. Robust anchoring binds each thread to its line, so comments hold as the buffer grows and lines shift above them.
Yes. Velt anchors comments to lines and selections in both the standard and diff editor views.
Yes. An agent posts a suggestion on the exact line as a first-class user, and a human approves or rejects it like a pull request.
No. Velt runs without you standing up a websocket fleet or merge backend.
On usage, not seats or integrations: you pay for documents with review activity in a month, with a free tier for development and early production.
Free tier. No credit card.
First comment in 5 minutes.
Slate
PlateJS
Let's lead with this. Strongest angle we have, @Ethan can you tighten the wording?