21st.dev Shipped Video in Three Days: Remotion Blocks, a Codex Plugin, Then the Fixes
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Disclosure: this post contains an affiliate link to 21st.dev. If you subscribe through it, DailyAIPedia may earn a commission at no extra cost to you. 21st.dev had no involvement in this post. Every item below was read off 21st.dev’s own changelog on 12 October 2026.
We reviewed 21st.dev on 2 October as what it was then: a library of 12,000-odd React components with an MCP server, sold quarterly or yearly from $6 a month. Five days later it started shipping video, and the shape of the product changed.
Three changelog entries on three consecutive days tell the story. On 7 October, Remotion video blocks. On 8 October, a plugin that makes videos inside Codex. On 9 October, the fixes for the playback problems the first two created. It is an unusually visible sprint, and the third entry is as informative as the first two.
| Date | Entry | What landed |
|---|---|---|
| 7 Oct | Video blocks for Remotion | A new Video section listing Remotion blocks for animated titles, interfaces, devices, charts, logos and backgrounds, grouped by what they show. One-command install, same as components. |
| 8 Oct | Make videos in Codex | A 21st plugin for Codex that turns a chat request into an editable video and opens it in the video editor beside the chat. |
| 9 Oct | Video previews keep playing | Playback starts immediately in Safari and WebKit; one failed block no longer blanks a whole preview; agent-made videos stopped shipping music that would not play. |
Remotion blocks, organised by what they show
Remotion is the library for making video in React — you write components, it renders frames. It is powerful and it has a blank-page problem: knowing that you can build an animated bar chart in React does not tell you how a good one is put together.
21st.dev’s answer is the one it already applies to UI. The new Video section carries blocks for animated titles, interfaces, device mockups, charts, logos and backgrounds, and the sidebar groups them by what they show rather than by how they were made. Open a block and you get a preview in every format it supports, the looks available for it, and similar blocks alongside. Bookmark it, or install it with one command.
If you have used 21st.dev for components this will feel like nothing new, which is the point. The same browse-preview-install loop, pointed at video.
The Codex plugin is the more interesting half
The next day 21st.dev shipped a plugin for Codex. You describe the video you want in the chat, and it comes back as an editable video open in the video editor next to the conversation. You install it from the Codex button on the Video page, or open something you started on the web from its title menu.
That is a different proposition from a block library. A block library hands you a starting point and leaves the composition to you; an agent-driven pipeline does the composition and leaves you editing. 21st.dev now does both, which makes it one of the few places where the browse route and the prompt route land in the same editor.
The sidebar changed with it. The Video sidebar now lists only what blocks show, with style, type, length and pace moved behind a Filter button. Selected filters appear as chips and persist in the link — so a filtered view is shareable — and they no longer carry over when you move to another section, which was the old irritation.
Read the third entry too
The 9 October entry is a list of fixes, and we are drawing attention to it rather than skipping it, because it tells you what shipping this fast actually cost.
Playback in Safari and other WebKit browsers had been holding on the first frame instead of starting. A single failed block was blanking an entire preview rather than showing a placeholder in its own slot. The video editor was not showing a loading state, so it felt slower than it was. And agent-made videos were being generated with music that failed to play.
None of that is alarming for a two-day-old feature, and all of it was fixed within forty-eight hours. But if you evaluated the video blocks on 7 or 8 October in Safari and came away unimpressed, that is why — and it is worth a second look now.
What this does not change
The commercial terms are unchanged by these three entries. 21st.dev states no prices, limits or model names in any of them, and our 2 October review still stands on the things that decide whether it suits you: it is billed quarterly or yearly with no monthly option, and it starts at $6 a month on that basis.
Nor does 21st.dev say what the video features cost. There is no statement about whether agent-made videos consume anything, whether video blocks count against the component copy allowance, or whether any of it is gated by tier. For a feature this new, that silence is normal. It is also the thing to check on your own account before you plan work around it.
What we could not verify
Open questions, stated plainly
- What the video features cost. None of the three changelog entries states a price, a limit or a tier requirement. The pricing-page figures we quote are from our 2 October review and predate video entirely.
- Whether video blocks count against the component allowance. 21st.dev’s free tier allows a stated number of component copies per day. It does not say whether a video block install draws on the same budget.
- Which Codex versions the plugin supports. 21st.dev names Codex but no version, platform or account requirement.
- How many video blocks exist. The entry lists the categories but gives no count, and we are not going to estimate one from browsing.
- What model makes the agent videos. Not stated anywhere in the three entries.
All three changelog entries above were read off 21st.dev’s own changelog at 21st.dev/changelog on 12 October 2026, which is dated newest-first by the vendor. Nothing was published there between 10 and 12 October. Pricing figures come from our own 21st.dev review, verified on 2 October 2026. If anything changes materially, this post gets a dated update box rather than a silent edit.
Frequently asked questions
What did 21st.dev add in October 2026?
Three things on consecutive days: Remotion video blocks on 7 October, a Codex plugin that turns a chat request into an editable video on 8 October, and a set of video playback fixes on 9 October.
What are 21st.dev video blocks?
Installable Remotion blocks — React components that render video — covering animated titles, interfaces, device mockups, charts, logos and backgrounds. They live in a new Video section, grouped by what they show, and install with one command in the same way as 21st.dev’s UI components.
Can I make videos from a prompt on 21st.dev?
Yes, through the 21st plugin for Codex, shipped 8 October 2026. You describe the video in the Codex chat and it opens as an editable video in the video editor beside the conversation. You can also open a video you started on the web from its title menu.
Do the video features cost extra on 21st.dev?
21st.dev has not said. None of the three October changelog entries mentions a price, a usage limit or a plan requirement for video. Check your own account before planning work around it.
Video previews would not play for me. Is that fixed?
Probably. On 9 October 2026, 21st.dev fixed playback holding on the first frame in Safari and other WebKit browsers, stopped a single failed block blanking a whole preview, and made the video editor show its loading state immediately. If you tried the video blocks on 7 or 8 October, try again.
How much does 21st.dev cost?
From $6 a month as of our 2 October 2026 check, but billed quarterly or yearly only — there is no monthly option. The October video releases did not change those terms.