Terms of Service

Last updated: April 26, 2026

1. Introduction

These Terms of Service ("Terms") govern your access to and use of the products and services operated by 21st Labs Inc. ("21st", "we", "our", or "us"), including the 21st.dev component marketplace at 21st.dev (the "Marketplace") and the 21st Agents software development kit and hosted platform (the "Agents Platform" and, together with the Marketplace, the "Services"). By accessing or using the Services, you agree to be bound by these Terms. If you are accepting these Terms on behalf of a company or other entity, you represent that you have authority to bind that entity.

2. Marketplace — Intellectual Property Rights

All code, content, and materials published on the Marketplace, including but not limited to components, documentation, metadata (such as names and descriptions), and all associated media assets (such as images, videos, and thumbnails), are the sole and exclusive property of their respective authors and 21st Labs Inc. Users are granted access to view and use the content solely through the official 21st.dev platform in accordance with these Terms.

3. Marketplace — Prohibited Activities

Users of the Marketplace are strictly prohibited from:

  • •Scraping or automatically collecting data from the Marketplace through web scraping, bots, crawlers, or any other automated means without explicit written consent from 21st Labs Inc.
  • •Using any content, code, or data from the Marketplace to train artificial intelligence models, machine learning systems, or similar technologies without explicit written consent from 21st Labs Inc.
  • •Redistributing, selling, or licensing any content from the Marketplace without authorization.
  • •Republishing or reusing media assets (such as images, GIFs, and video previews) or structured metadata (titles, descriptions, tags) from the Marketplace, including manual or automated means, without explicit written permission.
  • •Copying and redistributing components originally published on the Marketplace to other websites, social media platforms, or any other medium without providing a clear and visible link back to the original component page on 21st.dev.
  • •Attempting to circumvent any technical measures implemented to protect Marketplace content.

4. 21st Agents Platform

The Agents Platform provides hosted infrastructure for running AI agents that you build using the 21st Agents SDK. This Section 4 governs the Agents Platform specifically and supplements the general provisions of these Terms.

4.1 Customer content and data

"Customer Content" means the agent code, configurations, prompts, completions, conversation history, and other materials you or your authorized end users submit through the Agents Platform. As between you and 21st, you retain all right, title, and interest in Customer Content. You grant us a limited, worldwide, non-exclusive license to host, process, transmit, and display Customer Content solely as necessary to operate the Services for you. We do not use Customer Content to train our own machine-learning models without your explicit consent.

4.2 Customer obligations

  • •Keep your API keys secret. Do not embed them in public repositories, client-side code, or any context where end users could read them. Rotate keys promptly if you suspect a leak.
  • •Comply with all applicable laws (including data-protection laws such as GDPR, UK GDPR, and CCPA) when collecting or processing personal data through the Agents Platform. Provide any notices and obtain any consents required from your end users.
  • •Configure agent tools, system prompts, and access controls in a way that does not expose privileged operations to untrusted end users.
  • •Promptly notify us at security@21st.dev of any actual or suspected security incident affecting your use of the Services.

4.3 Acceptable use

You agree not to use the Agents Platform to:

  • •Generate, distribute, or facilitate illegal content; child sexual abuse material; content that incites violence or self-harm; or content that infringes third-party rights.
  • •Process protected health information ("PHI") subject to HIPAA, payment card data subject to PCI-DSS, or similarly regulated data without entering into a separate written agreement with 21st Labs Inc. addressing those requirements.
  • •Probe, scan, or test the vulnerability of the Services without authorization, or interfere with the integrity or availability of the Services.
  • •Resell or rebrand the Agents Platform as your own standalone offering without a separate written agreement.
  • •Exceed the rate limits and usage caps documented for your plan, or take actions designed to circumvent those limits.

4.4 Subprocessors

We use third-party subprocessors (including Vercel, Fly.io, Supabase, E2B, Anthropic, OpenAI, Cloudflare, Clerk, Stripe, and others) to deliver the Agents Platform. The current list is available in our Privacy Policy and on request. We will provide reasonable advance notice of material additions to the subprocessor list.

5. Service Availability and Disclaimers

The Services are provided "as is" and "as available". To the maximum extent permitted by applicable law, 21st Labs Inc. disclaims all warranties, express or implied, including warranties of merchantability, fitness for a particular purpose, title, and non-infringement. We do not warrant that the Services will be uninterrupted, error-free, or free from harmful components. Where a separate service-level agreement applies to your subscription, that agreement controls availability commitments; otherwise, no specific uptime is guaranteed.

6. Limitation of Liability

To the maximum extent permitted by law, 21st Labs Inc. and its affiliates, officers, employees, and agents will not be liable for any indirect, incidental, special, consequential, or punitive damages, or for any loss of profits, revenue, data, or use, arising out of or in connection with these Terms or the Services, regardless of the theory of liability and whether or not we have been advised of the possibility of such damages. Our aggregate liability arising out of or relating to the Services will not exceed the greater of one hundred US dollars (USD 100) and the amounts paid by you to 21st Labs Inc. for the Services in the twelve (12) months preceding the event giving rise to the liability. Some jurisdictions do not allow the exclusion or limitation of certain damages; in those jurisdictions, the foregoing limitations apply to the maximum extent permitted.

7. Indemnification

You will defend, indemnify, and hold harmless 21st Labs Inc. and its affiliates from and against any third-party claims, losses, damages, liabilities, costs, and expenses (including reasonable attorneys' fees) arising out of or relating to (a) your Customer Content, (b) your use of the Services in violation of these Terms or applicable law, or (c) your infringement or misappropriation of any third-party right.

8. Termination and Suspension

You may terminate your account at any time by following the cancellation flow in the Services or by contacting us. We may suspend or terminate your access to the Services, in whole or in part, if we reasonably believe you have violated these Terms, if your account has unpaid fees, or if continued provision of the Services would expose us or other customers to legal or security risk. Upon termination, your right to use the Services ceases; provisions that by their nature should survive termination (including ownership, disclaimers, limitations of liability, indemnification, and governing law) will survive.

9. Enforcement

We reserve the right to:

  • •Take appropriate legal action against violations of these Terms.
  • •Terminate or suspend access to our Services for violations.
  • •Remove or disable access to any content that violates these Terms.

10. Governing Law and Disputes

These Terms are governed by the laws of the State of Delaware, United States, without regard to its conflict-of-laws principles. The state and federal courts located in Delaware will have exclusive jurisdiction over any dispute arising out of or relating to these Terms or the Services, except that either party may seek injunctive relief in any court of competent jurisdiction. The United Nations Convention on Contracts for the International Sale of Goods does not apply.

11. Changes to Terms

We may modify these Terms from time to time. When we do, we will update the "Last updated" date above and, for material changes, provide prominent notice through the Services or by email. Your continued use of the Services after the effective date of a change constitutes acceptance of the modified Terms.

12. Contact

For any questions regarding these Terms, please contact:
21st Labs Inc.
1111B S Governors Ave, STE 28395
Dover, DE 19904, United States
Phone: (628) 227-7780
Email: support@21st.dev
Security disclosures: security@21st.dev