Terms of Service

01Acceptance of terms

These Terms of Service (“Terms”) govern your access to and use of the Stack18 website, Stack18 Platform, and any services delivered under a Stack18 Enterprise engagement (together, the “Services”), operated by Stack18 (“Stack18,” “we,” “us,” or “our”). By accessing or using the Services, you agree to be bound by these Terms. If you are using the Services on behalf of an organization, you represent that you have the authority to bind that organization.

02Description of services

Stack18 provides an AI-native software delivery studio that takes a business through discovery, design, build, and operate phases, combining AI agents with human oversight at defined approval gates. Services are made available through:

• Stack18 Platform — a self-serve workspace for running the Stack18 pipeline.
• Stack18 Enterprise — custom engagements such as Foundation Sprints, Full Builds, Rebuilds, and Embedded Stack arrangements, each governed by a separate order form or statement of work.

Where a specific engagement’s order form or statement of work conflicts with these Terms, the order form or statement of work controls for that engagement.

03Accounts & eligibility

You must provide accurate information when creating an account and keep your credentials confidential. You are responsible for activity that occurs under your account. The Services are intended for business use by individuals at least 18 years of age acting on behalf of an organization.

04Engagements & ordering

Stack18 Enterprise engagements begin with a signed order form, statement of work, or equivalent written agreement describing scope, deliverables, fees, and timeline. Work proceeds through documented approval gates — such as a signed PRD, approved architecture, and QA sign-off — and we will not move an engagement past a gate without the required approval from your organization.

05Intellectual property

Your content

You retain ownership of the business requirements, documentation, and other materials you provide to us (“Customer Content”). You grant us a license to use Customer Content solely to provide the Services.

Deliverables

Subject to full payment, source code and documentation produced specifically for your organization under a Stack18 Enterprise engagement are owned by your organization as set out in the applicable order form or statement of work.

Our platform

Stack18 retains all rights in the Stack18 Platform, our underlying methodology, frameworks, tooling, and any pre-existing or general-purpose components used to deliver the Services, excluding Customer Content and engagement-specific deliverables described above.

06Acceptable use

You agree not to:

• Use the Services to build or distribute anything unlawful, infringing, or harmful.
• Attempt to gain unauthorized access to the Services or other customers’ data.
• Reverse engineer, decompile, or attempt to extract the underlying models or source code of Stack18 Platform, except as permitted by law.
• Interfere with the integrity or performance of the Services, including through malware or excessive automated requests.
• Misrepresent your identity or affiliation when using the Services.

07Fees & payment

Fees for Stack18 Enterprise engagements and any paid tier of Stack18 Platform are set out in the applicable order form or in-product pricing. Unless stated otherwise, fees are non-refundable, invoices are due within the period specified on the invoice, and late payments may result in suspension of the Services.

08Confidentiality

Each party agrees to protect the other party’s confidential information using at least the same degree of care it uses for its own confidential information, and not to disclose it except to personnel, contractors, or subprocessors who need it to perform under these Terms or as required by law.

09Warranties & disclaimers

We will perform the Services in a professional and workmanlike manner. Except as expressly stated in these Terms or an applicable order form, the Services are provided “as is,” and we disclaim all other warranties, express or implied, including implied warranties of merchantability, fitness for a particular purpose, and non-infringement, to the extent permitted by law.

10Limitation of liability

To the extent permitted by law, neither party will be liable for indirect, incidental, special, consequential, or punitive damages, or for lost profits or lost data, arising out of or related to these Terms. Each party’s total liability arising out of or related to these Terms will not exceed the amounts paid or payable under the applicable order form in the twelve months preceding the claim, except where a higher limit is set out in that order form.

11Term & termination

These Terms remain in effect while you use the Services. Either party may terminate a Stack18 Platform account at any time; Stack18 Enterprise engagements terminate as set out in the applicable order form or statement of work. We may suspend or terminate access if you materially breach these Terms and do not cure the breach within a reasonable period after notice.

12General provisions

These Terms, together with any applicable order forms and data processing agreements, constitute the entire agreement between you and Stack18 regarding the Services. If any provision is found unenforceable, the remaining provisions continue in full force. Our failure to enforce a provision is not a waiver of our right to do so later. You may not assign these Terms without our written consent. We may update these Terms from time to time; material changes will be reflected in the “Last updated” date above.

13Contact us

Questions about these Terms can be sent to legal@stack18.ai, or through our contact page.