mostra: a Vercel Comments alternative for people without a Vercel account.
Both put comments on the page itself. Vercel's need a Vercel account. With mostra, anyone you send a link to can talk or type.
We make mostra, which competes with Vercel Comments. The facts about Vercel Comments come from Vercel's public pages, checked on November 9, 2026, and each row links to them.
Pick mostra if
- The people you ask don't have a Vercel account and shouldn't need one.
- They would rather talk than type, and move between pages while they do.
- You want a script tag on any host, with no Vercel project to link.
Side by side.
| What | mostra | Vercel Comments |
|---|---|---|
| Giving feedback | People open your invite link and start. No account, no extension. They're asked for a name, never an email address. | Everyone who comments logs in with a Vercel account. By default that's your team. You can invite people from outside it, or let anyone with the link comment once they log in. Sources 1 for Giving feedback 2 for Giving feedback 3 for Giving feedback |
| Other hosts | Any host and any framework, as long as you can add a script to the site. | Setup links your code to a Vercel project. The pages linked here don't say whether the toolbar runs on a site hosted elsewhere (checked November 9, 2026). Sources 1 for Other hosts 2 for Other hosts |
| Talking | Press Talk and use the site, moving between pages. When you press Stop, an OpenAI model turns what you said into comments on what you pointed at or named. Tested in desktop Chrome and Firefox, not on phones. | Comments are typed, with Markdown, emoji, mentions and screenshots. The page linked here doesn't describe voice comments (checked November 9, 2026). Sources 1 for Talking |
| Where a comment sits | On the element you clicked, pointed at or named. The pin finds the element again after the page re-renders. If it can't, the comment stays in the list without a pin. Look-alike elements that swap places can catch the wrong pin. | You click the page or highlight text. Vercel says a comment is attached to the element under it. Sources 1 for Where a comment sits 2 for Where a comment sits |
| What's captured | The words, the element with its state and styles, the page, window size, browser, and your site's version if it reports one. No screenshot, logs, session replay or video. | The browser, screen size and deployment a comment was made on. You can attach screenshots. Copy for Agents adds the element's path and React components. Sources 1 for What's captured 2 for What's captured 3 for What's captured |
| Coding agents | An MCP server for your own coding agent. It reads and replies to comments and marks them fixed or answered. A person marks them resolved. | Vercel MCP, on every plan, can list, read, reply to and resolve comment threads. Its command line tool manages them too. Sources 1 for Coding agents 2 for Coding agents 3 for Coding agents |
This is a selection of points we chose, not everything either tool does.
Talk while you look around.
With mostra, press Talk, use the site as usual and say what you think. Each point becomes its own comment, on what you pointed at or named.
“The logo feels small, I can’t find the pricing page, and this button looks disabled.”
How this was checked
Vercel's public pages were read on November 9, 2026. No Vercel account was opened and Vercel Comments wasn't tested, so each row says what those pages said that day. Products change, so check Vercel's site before you decide.
If something here is wrong or out of date, write to [email protected] and it will be corrected within 7 days.
mostra today
A beta, with no service level agreement, SSO or SOC 2. The script on your site is open source, under the MIT license. The free plan has one project, one builder and 15 talking minutes a month, of which one invited person can use 7.
Plans and prices are on the home page, not here.
Names
Vercel, the Vercel design, Next.js and related marks, designs and logos are trademarks or registered trademarks of Vercel, Inc. or its affiliates in the US and other countries. mostra is not affiliated with, or endorsed by, Vercel Comments or Vercel. How to reach mostra is in the Terms.