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Stack0

Terms of Service

Last updated: October 17, 2026

1. Agreement to Terms

These Terms of Service ("Terms") are an agreement between you and Campbell Venture Studio, LLC, a Delaware limited liability company doing business as Stack0 ("Stack0", "we", "us", or "our"). They cover your use of Stack0's websites, apps, dashboards, APIs, and products (the "Service"). By using the Service, you agree to these Terms. If you use the Service for an organization, you confirm that you can bind it to these Terms, and "you" means that organization.

Our Privacy Policy explains how we handle information and is part of these Terms.

2. The Service

The Service includes Chief (Stack0 Agents), Cloud, Build, Launch, SEO and SEO Autopilot, Studio, Analytics, Feedback, Design, and our developer APIs for email, file storage and delivery, web data, and video. We may add, change, or remove features. When we remove a paid feature you rely on, we will give you reasonable notice.

3. Accounts and Security

  • You must be at least 18 and give accurate account information
  • You are responsible for your account, your API keys, and everything done with them, including by your team members and by agents acting for you
  • Tell us right away at hello@stack0.dev if you suspect unauthorized use
  • Organization owners and admins control who has access, which roles they have, and which accounts are connected

4. AI Features

  • Many features use AI models, including models from third parties. AI output can be inaccurate, incomplete, or unsuitable for your purpose.
  • You are responsible for reviewing AI output before you rely on it, publish it, or let it take effect, especially for legal, financial, medical, or safety matters
  • Do not use AI features to make decisions about people that have legal or similarly significant effects without human review

5. Product Terms

5.1 Chief and Other Agents

  • Chief and other agents act for you within the permissions you give them and the accounts you connect. When you connect an account or approve a plan, task, or action, you authorize the agent to act in that account for you.
  • You are responsible for what your agents send and do for you, including emails, posts, messages, bookings, changes to your website and software, and payments, in the same way as if you did it yourself. Review your agents' settings, plans, and approvals.
  • You can stop an agent, change its permissions, or disconnect an account at any time. Actions already taken may not be reversible.
  • Chief may ask for your approval before some actions. Approval steps help you stay in control. They do not guarantee that every action will be correct.

5.2 Chief's Conversation Before Sign-Up

Anyone can talk with Chief at agents.stack0.dev/start and receive a written plan for their business. The plan is a proposal, not a quote or a contract. What Chief builds, and what it costs, is set when you sign up and approve a plan.

5.3 Texting and Calls

When texting and calling become available in Chief, you agree to use them only in compliance with the law, including the Telephone Consumer Protection Act, the CAN-SPAM Act, carrier rules, and similar laws where you operate. You are responsible for getting and keeping any consent required to text or call your customers, for honoring opt-outs, and for the content of messages and calls sent for you.

5.4 Build, Cloud, and Launch

  • You own the code, content, and data that the Service creates for you or that you upload, subject to the rights of third parties in material you provide. We keep all rights in the Service itself, including our platform, frameworks, templates, blueprints, and tools.
  • You may use, change, and move the code and content we produce for you. Parts of it may depend on the Service to keep running.
  • You are responsible for the apps and websites you run on the Service, what they do, and the data they collect
  • Domains you buy through the Service are registered in your name or your organization's name and renew as described when you buy them

5.5 SEO Autopilot

SEO Autopilot proposes changes to your site as pull requests in the repository you connect. Changes take effect only when you, or a rule you set, merges them. You are responsible for reviewing what you merge.

5.6 Developer APIs

  • Email: you may send only email that recipients expect or have agreed to, following anti-spam laws. We may suspend sending when bounce or complaint rates are high.
  • Storage and delivery: you are responsible for the files you store and share
  • Web data: you may request only pages you are allowed to access and use, and you are responsible for complying with the terms and laws that apply to that content
  • Rate limits: API use is subject to rate limits and fair use. We may limit traffic that harms the Service or other customers.

5.7 Payments for Your Business

If you use Chief to take card payments from your own customers, those payments are processed by a payment partner, such as Run Payments and its processors, under a merchant agreement between you and that partner. The partner decides whether to approve your account. Stack0 is not a party to your payment transactions and does not hold your funds. Stack0 may receive a share of processing fees from the partner.

6. Your Customers

When you use the Service to work with your own customers, you are responsible for your relationship with them, including your prices, products, refunds, and the privacy notices and consents your customers need. We process your customers' information for you as described in our Privacy Policy.

7. Acceptable Use

You may not use the Service to:

  • Break the law or help others break it
  • Send spam, or send texts, calls, or emails without the consent the law requires
  • Harass, threaten, defraud, or impersonate anyone
  • Store or share illegal content, malware, or content that infringes others' rights
  • Collect data from other sites in ways that break their terms or the law, or overload them
  • Get around usage limits, security controls, or billing, or access accounts and data you are not allowed to
  • Probe, attack, or disrupt the Service or its infrastructure
  • Mine cryptocurrency or run workloads unrelated to your product on our compute
  • Build a competing product by copying the Service
  • Use AI features to create content that deceives people about who made it, where the law requires disclosure

8. Pricing and Payment

  • Plans are billed monthly in advance. Many products are also billed by usage, such as AI model use, compute, storage, bandwidth, and emails, at the prices shown in the Service.
  • Some plans include a monthly usage credit. Usage first draws on that credit, and usage beyond it is billed at the end of the billing period. Unused credit does not carry over.
  • Payments are processed by Stripe. You authorize us to charge your payment method for your plan, your usage, and any taxes.
  • Prices exclude taxes unless stated. You are responsible for applicable taxes other than taxes on our income.
  • We may change prices with at least 30 days' notice. Changes apply from your next billing period after the notice.
  • You can cancel at any time. Cancellation takes effect at the end of the current billing period. Fees already paid are not refunded, except where the law requires.
  • If a payment fails, we may limit or suspend paid features until it is resolved. Some products set a spending limit you control.

9. Your Content and Ownership

  • You own Your Content. You give us a license to host, copy, process, transmit, and display it only as needed to provide and secure the Service and to follow your instructions.
  • You confirm that you have the rights needed for Your Content and for the accounts you connect
  • We do not use Your Content to train our own AI models, and we do not sell it
  • If you send us feedback or ideas, we may use them without obligation to you

10. Our Intellectual Property

The Service, including our software, SDKs, documentation, designs, and trademarks, belongs to Stack0 and its licensors. These Terms give you a limited, non-exclusive, non-transferable right to use the Service while your account is in good standing. You may use our SDKs to integrate with the Service. No other rights are granted.

11. Confidentiality

Each party will protect the other's non-public information that it receives through the Service with reasonable care, and use it only to perform under these Terms. This does not apply to information that is public, already known, independently developed, or that must be disclosed by law.

12. Suspension and Termination

  • We may suspend or end your access if you break these Terms, do not pay, create a security or legal risk, or harm the Service or others. Where reasonable, we will tell you first and give you a chance to fix the problem.
  • You can close your account at any time
  • After termination you can export Your Content for 30 days, unless the law or a security risk prevents it. We then delete it as described in our Privacy Policy.
  • Sections that by their nature should survive termination survive it, including payment obligations, ownership, disclaimers, limits of liability, and indemnity

13. Disclaimer of Warranties

THE SERVICE IS PROVIDED "AS IS" AND "AS AVAILABLE". TO THE EXTENT THE LAW ALLOWS, WE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND NON-INFRINGEMENT. WE DO NOT PROMISE THAT THE SERVICE WILL BE UNINTERRUPTED OR ERROR-FREE, THAT AI OUTPUT WILL BE ACCURATE, OR THAT THE SERVICE WILL MEET YOUR NEEDS.

14. Limitation of Liability

TO THE EXTENT THE LAW ALLOWS: (A) NEITHER PARTY IS LIABLE FOR INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR FOR LOST PROFITS, REVENUE, OR DATA, EVEN IF TOLD THEY WERE POSSIBLE; AND (B) EACH PARTY'S TOTAL LIABILITY UNDER THESE TERMS IS LIMITED TO THE FEES YOU PAID STACK0 IN THE 12 MONTHS BEFORE THE EVENT THAT CAUSED THE CLAIM. THESE LIMITS DO NOT APPLY TO YOUR PAYMENT OBLIGATIONS, YOUR INDEMNITY OBLIGATIONS, OR A PARTY'S FRAUD OR WILLFUL MISCONDUCT.

15. Indemnification

You will defend and indemnify Stack0 against third-party claims, and the resulting losses and reasonable costs, that arise from Your Content, your use of the Service in breach of these Terms or the law, the messages, posts, and actions you or your agents send or take, or your dealings with your own customers. We will tell you about the claim promptly and let you control its defense, and you will not settle it in a way that admits fault for us without our consent.

16. Governing Law and Disputes

These Terms are governed by the laws of the State of Texas, without regard to its conflict of laws rules. Any dispute arising from these Terms or the Service will be brought only in the state or federal courts located in Dallas County, Texas, and both parties consent to the jurisdiction of those courts. Before filing a claim, the party with the complaint will contact the other and try in good faith to resolve it for 30 days. Either party may seek an injunction in any court to protect its intellectual property or confidential information.

17. Changes to These Terms

We may update these Terms. We will tell you about material changes at least 30 days before they take effect, by email or a notice in the Service. If you keep using the Service after a change takes effect, the updated Terms apply. If you do not agree, stop using the Service and close your account.

18. General

  • Entire agreement: these Terms, the Privacy Policy, and any order or plan you accept are the whole agreement between us about the Service
  • Assignment: you may not assign these Terms without our consent. We may assign them in a merger, acquisition, or sale of assets.
  • Severability: if a part of these Terms is unenforceable, the rest stays in effect
  • No waiver: not enforcing a term is not a waiver of it
  • Force majeure: neither party is liable for delays or failures caused by events beyond its reasonable control, such as natural disasters, war, pandemics, or failures of the internet or of providers we depend on
  • Independent parties: nothing in these Terms creates a partnership, agency, or employment relationship
  • Notices: notices to Stack0 go to hello@stack0.dev. Notices to you go to the email address on your account.

19. Contact

Questions about these Terms: hello@stack0.dev. Campbell Venture Studio, LLC, doing business as Stack0.