UI by Vercel Labs
A library of behaviors for agents to build the next generation of user interfaces.
Recently added on Nov 14, 2026. The description, category and pricing were filled in from public metadata and have not been checked by an editor yet.
On this page
Usage data: latest readings Nov 14, 2026, last checked Nov 14, 08:07 UTC. Date of each number
What UI does
It is free and open source (Apache-2.0); you pay only for the models it calls.
Key facts
| Maker | Vercel Labs |
|---|---|
| First released | October 2026 |
| License | Apache-2.0 |
| Main language | TypeScript |
| Open issues and PRs | 47 |
Pricing
Open source under the Apache-2.0 licence; check the website for any paid hosted plans.
Checked Nov 14, 2026. Prices change often; confirm before you buy.
Quick answers
- Free to start?Yes
- Open source?Yes (Apache-2.0)
- Closest alternativeLangChain · all alternatives
Add-ons for UI: save tokens, add memory and tools
LiteLLM
One gateway for 100+ models with spend tracking, budgets, rate limits and fallbacks.
Langfuse
Traces every model and tool call with its cost and latency, and runs evaluations.
Firecrawl
Turns websites into clean Markdown or structured data the agent can read.
E2B
Runs agent-written code in isolated cloud sandboxes instead of on your machine.
Composio
Connects the agent to 1,000+ apps and APIs with managed sign-in.
Mem0
Adds long-term memory, so the agent remembers users and past work across sessions.
Listed because each tool documents support for UI or for agent frameworks in general. Savings and results depend on your workload.
UI alternatives
Best UI alternatives compared · All agent frameworks and SDKs
| # | Agent | Gid Score | Downloads 7d | 7d | 30d | Stars | Latest release | Price | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |
LangChainLangChain |
79 | 39.2M | down 2.5% | down 5.3% | 149K+56/day | 1.5.03d ago | Free (OSS) | |||
| 2 |
LangGraphLangChain |
74 | 19M | up 1.7% | up 20.7% | 44.9K+51/day | 1.2.22today | Free (OSS) | |||
| 3 |
AI SDKVercel |
67 | 44.8M | down 0.1% | up 31.4% | 27.9K+22/day | 6.0.332yesterday | Free (OSS) | |||
| 4 |
Claude Agent SDKAnthropic |
64 | 27.8M | up 3.6% | up 27.2% | 8,541+15/day | 0.2.182yesterday | Free (OSS) | |||
| 5 |
OpenAI Agents SDKOpenAI |
61 | 6.8M | down 8.9% | up 29.7% | 30.7K+20/day | 0.24.030d ago | Free (OSS) | |||
| 6 |
MastraMastra |
59 | 3.2M | up 2.3% | up 38.1% | 29.5K+19/day | 1.83.0yesterday | Free (OSS) | |||
Ratings from people who use UI
No ratings yet. Used UI? Rate it and say what it is good and bad at.
UI news
-
2 agents added to AgentGid
Openfuse, UI
-
UI reached 2,424 GitHub stars in a week
It had almost none a week earlier.
UI popularity and usage data
The GitHub repository has 4,055 stars and has been adding about 578 a day since Nov 7.
Download the raw daily series: ui.csv
Gid Score breakdown
Gid Score shows public popularity and activity (usage, GitHub stars, mentions, growth), not the quality of the product. Each component is scored 0 to 100 from public signals; a dash means no data for it. How the Gid Score works.
How fresh these numbers are
| Number | Latest reading | Last checked |
|---|---|---|
| GitHub stars | Nov 14, 2026 | Nov 14, 08:07 UTC |
We fetch every source once a day. Registries publish downloads and page views a day or two late, so their latest reading trails the check. A reading more than 4 days old is marked out of date; the Gid Score still uses it until a newer one arrives.
UI FAQ
How much does UI cost?
Open source under the Apache-2.0 licence; check the website for any paid hosted plans.
Is UI open source?
Yes. UI is open source, released under the Apache-2.0 license.
How popular is UI?
The GitHub repository has 4,055 stars and has been adding about 578 a day since Nov 7.
What are the alternatives to UI?
The closest alternatives in the same category by Gid Score are LangChain, LangGraph, AI SDK, Claude Agent SDK.
For the makers of UI badges, corrections
Something wrong or outdated on this page? Send a correction with a link to the official source. More for makers.
Where these numbers come from
GitHub: vercel-labs/ui. Site rank: ui-sdk.dev on the Tranco list. See data sources for how each one is collected.
Product facts and pricing were checked against: ui-sdk.dev, github.com.