A free Markup.io alternative, no signup for reviewers

Yes, CobaltCapture is a free, browser-based alternative to Markup.io for one-shot reviews. No reviewer signup, no per-seat plan, no install. The output is a clean review, a public URL plus one-click markdown, PDF, and Word exports, that any reader can open without an account, and any AI coding agent can ingest natively.

Markup.io is built for agencies running multi-round client review on live URLs. Pin comments, threaded discussions, approval workflows, paid per seat. That's the right tool for a long-running client engagement with a fixed roster of stakeholders.

CobaltCapture is the lightweight alternative for the user whose review is single-pass and whose reviewers should not have to sign up. No install, no per-seat pricing, free. Public review URLs that just work.

What Markup.io is good at

Markup.io shines as a client review tool. Paste a URL, get a hosted overlay where stakeholders can drop pins on the live page and leave comments on the exact element they care about. You see the design in context, not in a static screenshot. The comment thread is the artifact, and it persists across rounds, exactly what an agency wants when a project goes through three or four review cycles before sign-off.

Multiple stakeholders can comment on the same URL without stepping on each other. Each pin has its own thread. Replies, mentions, and resolution status all live in one view. The project owner can scan the board to see what's still open before invoicing the next milestone. For agencies that bill by round, that visible audit trail is the product.

Where the approaches differ

Reviewers have to sign up or accept an invite to comment. Fine on a long engagement with a fixed client account; friction on a one-off review where the reviewer is a teammate, a contractor, or anyone whose name isn't already on the project. The signup step bleeds reviews that would have happened in a single tab.

Per-seat pricing is the second. Markup.io is priced for ongoing agency-client engagements. A solo designer or an in-house team running one piece of feedback ends up paying for the multi-round infrastructure they don't use.

The artifact lives inside Markup.io. Exports are HTML or PDF, fine for a human reader, wrong shape for an AI coding agent. Strip the chrome and you lose the pin positions, the screenshots, and the resolution state. The feedback is locked to Markup.io's domain rather than living somewhere your team can paste anywhere and your agent can fetch.

How CobaltCapture is different

CobaltCapture publishes a clean public review at a URL. No signup to view, no signup to publish, no per-seat plan. The reader follows the link in their browser. A stakeholder URL at /s/<slug> strips the editing chrome for clients who shouldn't see it. The reviewer URL at /r/<slug> is for owners and developers.

Capture happens in the browser. Hit capture, pick the window or tab, drag a box around the part that matters, hit dictate and talk through the issue. The voice becomes editable text next to the cropped image. Numbered pins on each screenshot get burned into every export. No overlay script to install on the site you're reviewing. No desktop app, no extension.

The output is portable. Markdown, PDF, and Word exports are one click each. The same review reads cleanly in a PRD, lands in a Slack preview, and pastes into a Cursor or Claude Code session. One artifact, many readers.

Free.

When to use which

Use Markup.io when the reviewer is a client tracked across rounds. If you bill by review round, if you need a comment thread that persists across revisions, if stakeholders are leaving feedback over weeks and you need an audit trail of who said what and what got resolved, Markup.io is the right tool. The pinned-thread model is purpose-built for that workflow.

Use CobaltCapture when the review is one-shot, the reviewer should not have to sign up, and the next reader is a developer, a stakeholder, or an AI coding agent. The feedback gets read once, acted on, and archived. Free, no install, no per-seat plan.

Feature comparison

	Markup.io	CobaltCapture
Install required	No (URL paste)	None (browser only)
Reviewer needs an account	Yes (invite or signup)	No
Per-seat pricing	Yes	No
Output formats	Hosted thread, HTML/PDF export	Markdown, PDF, Word, public URL
Numbered pins (in exports)	Pin threads (in app)	Burned into every export
Stakeholder-only URL	No	Yes (/s/<slug>)
Multi-round comment threads	Yes, primary feature	No (single-pass artifact)
AI-agent readable	No	Native markdown
Pricing	Paid tiers	Free

The honest version

If you're an agency running rounds of review with a client roster, Markup.io is the right tool. If you're an in-house team, a solo designer, or anyone whose volume is "send one review this afternoon to a developer or a teammate," CobaltCapture does that part free and doesn't make the reviewer sign up.

Product details and pricing change frequently. Check each vendor's site for the current state of their offering.

Get started

cobaltcapture.com, publish your first review in about a minute. No install, no signup needed to try.

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Frequently asked questions

Is CobaltCapture really a free Markup.io alternative?

Yes, for the one-shot review use case. CobaltCapture is free to use, free to share, and free to export. No per-seat plan, no trial countdown. The tradeoff: CobaltCapture does not include multi-round comment threads or an approval workflow. It is the right tool when the review is single-pass, not when you're tracking client feedback across revisions.

Do reviewers have to sign up to comment on a CobaltCapture review?

Reviewers don't need to sign up to read a CobaltCapture review, public URLs work for anyone with a link. CobaltCapture is single-reviewer for v1, so the reviewer experience is the person doing the capture rather than threaded comments. There's a clean stakeholder URL at /s/<slug> for read-only handoff to clients or executives.

Does CobaltCapture require a per-seat plan?

No. CobaltCapture is free with no per-seat pricing. Markup.io is priced for ongoing agency-client engagements with per-user plans; CobaltCapture is for the user whose volume is 'send one review this afternoon.'

Can a coding agent read a CobaltCapture review?

Yes. CobaltCapture publishes clean markdown with embedded screenshots, the format AI coding agents like Cursor and Claude Code ingest natively. Markup.io's HTML and PDF exports are built for humans reading on its domain, not for paste-into-an-agent workflows.

When should I still use Markup.io instead of CobaltCapture?

Use Markup.io when the reviewer is a client tracked across rounds, you bill by review round, you need a comment thread that persists across revisions, and you want an audit trail of who said what and what got resolved. Markup.io's pinned-thread model is purpose-built for that workflow.