Thesys
Thesys makes generative UI: its C1 API turns an LLM's response into a live, interactive interface - charts, forms, tables - instead of a wall of text, so AI apps render real UI on the fly. It is aimed at developers building chat and agent products. Starts free with $10 in credits, then pay-as-you-go; enterprise plans add private deployment and SLAs.
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Our take
Thesys C1 takes a real problem - LLM apps that dump text when they should show a chart or a form - and solves it with an API that generates live UI from the model's output. It is early ($2.3M ARR) and you write the integration, but the idea is novel and the free credits make it cheap to try. Best for teams building serious chat or agent UIs.
Best for
Developers building chat or agent products who want the model to return interactive UI - charts, forms, tables - instead of plain text, without hand-building each component.
Pros
- Generates live, interactive UI from LLM output
- Free tier with $10 credits, then transparent pay-as-you-go
- Solves a genuine gap for chat and agent apps
- Enterprise option with private deployment and SOC2/GDPR
Cons
- Developer API - you build the integration
- Early-stage company and ecosystem
- LLM tokens billed separately on top of API calls
How it compares
There is no obvious incumbent for generative UI, which is rather the point - Thesys is defining the category rather than competing in it. The nearest alternatives are hand-built component systems or framework-specific tools, which cost far more engineering time.
Full review
Thesys is a generative-UI company. Its C1 API sits between your large language model and your app: instead of returning a block of text, the model's response comes back as a live, interactive interface - charts, forms, tables, controls - rendered on the fly. For chat and agent products that constantly need to show structured information, that closes a real gap between what the model knows and what the user can actually use.
Pricing is developer-friendly to start: an Essentials plan at $0 with $10 of free credits, then pay-as-you-go, with a separate Reports API that gives 100 free pages a month. API calls are included in plans while the underlying LLM tokens are billed by your provider. Enterprise adds private deployments, SLAs and compliance. It is an early company - around $2.3M ARR - so you are betting on a young category, but it is a genuinely novel one.
Cloudkart Trust Graph
3.8/5- Actual Utility4/5
Source: Initial LLM-authored rubric (backfill)
- Ease of Use3/5
Source: Initial LLM-authored rubric (backfill)
- Pricing Fairness4/5
Source: Initial LLM-authored rubric (backfill)
- Reliability3/5
Source: Initial LLM-authored rubric (backfill)
- Differentiation5/5
Source: Initial LLM-authored rubric (backfill)
Scored as of . Each score is versioned and auditable; vendors cannot buy it.
How this score is set
- Editorial rubric
- Primary signal — five dimensions, 3.8/5 average.
- Community reviews
- None yet.
- Pricing verified
- Not yet verified
- Independence
- Score set by our editorial team before any affiliate relationship is considered. No vendor can buy it.
Frequently asked questions
- Is Thesys free, and how much does it cost?
- Thesys has a free tier, with paid plans that unlock advanced features.
- Who is Thesys best for?
- Developers building chat or agent products who want the model to return interactive UI - charts, forms, tables - instead of plain text, without hand-building each component.
- How is Thesys rated on Cloudkart.ai?
- Thesys scores 3.8 out of 5 on the Cloudkart.ai rubric, which weighs actual utility, ease of use, pricing fairness, reliability and differentiation. Scores are set editorially and can never be bought.
Community reviews
No community reviews yet. Be the first to share how Thesys works for you.
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