Terms of Service

Last updated: April 13, 2026

These Terms of Service ("Terms") govern your access to and use of Quack Stack ("the Service"), operated by Willow Stories FlexCo, Rotenlöwengasse 15/5, 1090 Vienna, Austria ("we", "us", "Willow Stories"). By creating an account, accessing, or using the Service, you agree to be bound by these Terms. If you do not agree, do not use the Service.

1. Definitions

  • Service — the Quack Stack platform, including the web application at app.quack-stack.com, the marketing site at quack-stack.com, any command-line tools we publish (including @quack-stack/cli), any MCP (Model Context Protocol) servers we publish, our Slack integration, and any APIs we provide.
  • Account — an individual user identity, secured by an email address and password (or other authentication method), used to access the Service.
  • Workspace — a shared environment within the Service where one or more Accounts collaborate on one or more Projects. A Workspace is the unit to which a paid subscription attaches.
  • Project — a self-contained body of work within a Workspace, typically corresponding to one product, company, or strategic initiative.
  • Customer Data — any content, text, file, URL, strategy document, competitor list, interview transcript, support ticket, message, or other data you submit to, upload to, or generate within the Service.
  • Subscription — a paid plan (Starter, Pro, or Enterprise) purchased by a Workspace Owner on behalf of a Workspace.
  • Workspace Owner — the legal entity or individual who purchases a Subscription for a Workspace and is responsible for paying for it. The Workspace Owner is our direct customer and controls the Workspace.
  • Workspace Member — any Account that has been granted access to a Workspace by the Workspace Owner or another Member with permission to invite.
  • Credits — the usage-based unit that measures AI work performed by the Service. Each Subscription plan includes a monthly allowance of Credits.
  • User Content — Customer Data plus anything else you post, submit, or generate through the Service.

2. The Service

Quack Stack is a continuous product intelligence platform for product teams. It ingests signals from markets, customers, competitors, and team conversations, then synthesises that information into shared strategic context and prioritised work. Core capabilities include market research, competitor intelligence, customer interview processing, experiment design and tracking, strategy document generation, and a conversational AI product guide.

The Service is provided to businesses for business use. It is not intended for personal or consumer use.

3. Accounts and eligibility

Eligibility. You must be at least 16 years old to create an Account. If you are accessing the Service on behalf of a company or other legal entity, you represent that you have authority to bind that entity to these Terms, in which case "you" refers to that entity.

Account security. You are responsible for keeping your login credentials secure and for all activity that occurs under your Account. You must notify us immediately at [email protected] if you suspect unauthorised use of your Account.

One person per Account. Each Account is for a single natural person. Sharing credentials between multiple people is not permitted. Workspaces can and should contain multiple Accounts — invite colleagues instead of sharing a login.

Accurate information. You must provide accurate and current information when creating your Account and keep it up to date.

4. Workspaces, Subscriptions, and who pays

Individual and company use. When you first create an Account, you can use the Service in a personal or evaluation capacity. If your company later purchases a Subscription for a Workspace that contains your work, the company becomes the Workspace Owner for that Workspace and your work within it becomes subject to that company's control. You agree to this transition as a condition of using the Service.

Workspace Owner responsibilities. The Workspace Owner is responsible for:

  • Paying the Subscription fees for the Workspace.
  • Managing which Accounts have access to the Workspace.
  • Ensuring that all Workspace Members comply with these Terms.
  • Any Customer Data uploaded to the Workspace, including having the right to upload it and to have it processed by the Service and our subprocessors.

Workspace Member rights. If you are a Workspace Member but not the Workspace Owner, you acknowledge that the Workspace Owner controls the Workspace and may:

  • Remove your access.
  • Export, modify, or delete Customer Data within the Workspace.
  • Transfer ownership of the Workspace.
  • Terminate the Subscription.

We will follow the Workspace Owner's instructions with respect to the Workspace, including when those instructions affect your access.

5. Plans, Credits, and billing

Plans. The current plans and their features are published at quack-stack.com/pricing. The authoritative description of what each plan includes is that pricing page at the time of purchase.

Credits. Each plan includes a monthly allowance of Credits, which measure the AI work the Service performs on your behalf (market research, competitor analysis, strategy document generation, guide conversations, and similar). Your Workspace dashboard shows real-time Credit consumption. If a Workspace exhausts its Credits before the end of a billing period, the Service will pause or throttle AI-powered actions in that Workspace until Credits are topped up or the next billing period begins.

Early access and trials. During early access or trial periods, Workspaces receive a complimentary Credit balance. The trial ends when those Credits are exhausted or when we convert the Workspace to a paid Subscription, whichever comes first. We reserve the right to change the size of the trial Credit balance at any time.

Billing cycle. Subscriptions are billed in advance, either monthly or annually depending on the option you select. Annual Subscriptions receive two months free compared to monthly.

Payment and taxes. Fees are stated exclusive of applicable taxes, including VAT. You are responsible for any taxes owed on your Subscription.

Price changes. We may change our pricing from time to time. Any price change affecting your Workspace will take effect no sooner than the next renewal of your Subscription and we will notify the Workspace Owner by email at least 30 days before the change takes effect.

Late payment. If a payment fails, we will attempt to collect it again and notify the Workspace Owner. If payment remains unpaid after 14 days, we may suspend access to the Workspace. Subscriptions unpaid for 30 days may be terminated and Customer Data deleted in accordance with section 11.

Refunds. Subscriptions are non-refundable except where required by law or granted at our discretion on a case-by-case basis. If we agree to a refund for a cancelled Subscription, we will refund unused time on a pro-rata basis.

6. Acceptable use

You agree not to:

  • Use the Service for any unlawful purpose or in violation of any applicable law or regulation, including export control laws and sanctions programmes (EU, US, UK, and UN).
  • Attempt to access accounts, data, or Workspaces that do not belong to you, or to circumvent any security or access-control feature of the Service.
  • Reverse engineer, decompile, disassemble, or otherwise attempt to derive the source code of the Service, except to the extent this restriction is prohibited by applicable law.
  • Use automated means (scrapers, bots, headless browsers, API clients beyond our published interfaces) to access the Service in ways that exceed published rate limits or that impose an unreasonable load on our infrastructure.
  • Resell, sublicense, rent, lease, or otherwise redistribute the Service or access to it without our prior written permission.
  • Use the Service to train, fine-tune, or benchmark a competing machine-learning model or competing product intelligence service.
  • Upload, process, or generate content that is unlawful, defamatory, obscene, fraudulent, harassing, infringing, or that contains malware.
  • Upload special-category personal data (within the meaning of GDPR Article 9 — health, biometric, racial, political, religious, sexual, or criminal-history data) unless you have obtained our prior written agreement to process such data.
  • Upload data subject to specific regulatory regimes (HIPAA, PCI-DSS, FERPA, etc.) unless we have agreed in writing that the Service is suitable for that data.

7. Your content, our outputs

You own your Customer Data. You retain all right, title, and interest in and to Customer Data. We claim no ownership over Customer Data.

Limited licence to us. You grant us a worldwide, non-exclusive, royalty-free licence to host, copy, transmit, display, process, and analyse Customer Data solely for the purposes of providing, maintaining, securing, and improving the Service for you.

AI-generated outputs. The Service generates strategic analysis, experiment plans, recommendations, synthesised insights, and similar content using third-party AI models ("AI Outputs"). As between you and us, you own the AI Outputs generated in your Workspace, subject to the following important limitations:

  • AI Outputs are generated by probabilistic models and may be incorrect, out of date, biased, or inconsistent. You are responsible for reviewing AI Outputs before relying on them for business decisions.
  • Similar AI Outputs may be generated for other customers working on similar problems. You cannot claim exclusive rights over common patterns, phrasings, or insights that the AI produces for many users.
  • AI Outputs may incorporate or paraphrase content from public sources (web pages, competitor sites, news articles). You are responsible for any downstream use of such content, including respecting third-party copyright, trademark, and attribution obligations.
  • We do not warrant that AI Outputs are original, accurate, complete, or non-infringing.

No training on your Customer Data. We do not use your Customer Data to train general-purpose AI models for other customers or third parties. Customer Data is processed only within your Workspace and used only to provide the Service to you.

Feedback. If you voluntarily submit feedback, ideas, or suggestions about the Service, you grant us an unlimited licence to use that feedback without restriction or attribution.

8. Third-party AI processing

The Service relies on a third-party AI provider — currently Anthropic (Claude models) — to process Customer Data. When you submit Customer Data to the Service, relevant portions of it may be transmitted to Anthropic for analysis. We have selected Anthropic because its enterprise data-handling policies commit to not training models on customer inputs, but you acknowledge and agree that:

  • Third-party AI providers are outside our direct control.
  • Their data handling is governed by their own terms (linked in our Privacy Policy under "Third-party subprocessors").
  • You should not upload Customer Data that you are not permitted to share with such providers.

We may add or change AI providers from time to time. Material changes will be reflected in our Privacy Policy's subprocessor list.

If you use our MCP (Model Context Protocol) connectors or CLI from an AI client such as Claude Desktop or ChatGPT, your conversations with that client pass through the AI provider of that client, and those conversations may reference Customer Data in your Workspace. Your use of those clients is subject to their own terms and privacy policies.

9. Integrations and third-party services

The Service integrates with third-party services (such as Slack, email providers, and others). When you connect a third-party service to your Workspace:

  • You authorise us to access and process data from that service on your behalf, within the scope of the permissions you grant.
  • Use of that service remains subject to the third party's own terms.
  • We are not responsible for the availability, accuracy, or behaviour of third-party services.
  • If a third-party service is discontinued or changes its API, the corresponding integration may stop working without notice.

10. Early access

The Service is currently in early access. This means the entire Service is provided to you on an experimental basis, and you acknowledge and agree that:

  • The Service is evolving rapidly. Features may be added, changed, reworked, or removed without notice, including features you currently rely on.
  • The Service is provided "as-is" for the purpose of testing, feedback, and your early use. It may be less reliable than a generally-available product. Bugs, downtime, unexpected behaviour, and data loss are possible.
  • There is no service level commitment during early access. We do not guarantee uptime, performance, or availability.
  • Any AI Outputs, research findings, or recommendations produced during early access should be treated as preliminary. You should independently verify them before acting on them.
  • We may contact you for feedback on the Service. Participation is optional but appreciated.
  • Your Credit balance during early access is a trial allowance that we may adjust, withdraw, or reset at our discretion. Section 5 explains how trial Credits work.

In addition, parts of the Service may be labelled "beta", "preview", "experimental", or similar — those features are subject to the same terms as everything else during early access.

When we transition the Service out of early access, we will notify you and may publish a separate statement describing any changes to these Terms that accompany that transition. Until then, your use of the Service is entirely at your own risk and subject to this section.

11. Term and termination

By you. You may terminate your Account at any time by contacting us at [email protected] or by following the in-product deletion flow if one is available. Termination of your personal Account does not automatically terminate a Workspace Subscription if your company is the Workspace Owner.

By the Workspace Owner. A Workspace Owner may cancel a Subscription at any time. Cancellation takes effect at the end of the current billing period.

By us. We may suspend or terminate your Account or a Workspace's access to the Service immediately if:

  • You materially breach these Terms and fail to cure the breach within 14 days of notice (or, for breaches that cannot be cured, immediately).
  • Your use of the Service creates a security, legal, or operational risk to us or other users.
  • Payment is more than 30 days overdue.
  • We are required to do so by law or court order.

Effect of termination. On termination:

  • Your access to the Service ends.
  • We will make Customer Data available for export for 30 days following termination, after which we will delete it.
  • Backups of Customer Data may persist for up to 90 days before being overwritten.
  • Anonymised, aggregated data and log data may be retained in line with our Privacy Policy.
  • Any fees already paid are non-refundable except as set out in section 5.
  • Sections that by their nature should survive termination (definitions, ownership, limitation of liability, indemnification, governing law, and miscellaneous) survive.

12. Warranties and disclaimers

We provide the Service with reasonable care and skill. However, to the fullest extent permitted by law and except for the foregoing, the Service is provided "AS IS" and "AS AVAILABLE" without warranties of any kind, whether express, implied, statutory, or otherwise. We specifically disclaim all implied warranties of merchantability, fitness for a particular purpose, title, and non-infringement. We do not warrant that:

  • The Service will be uninterrupted, timely, secure, or error-free.
  • AI Outputs will be accurate, reliable, complete, or suitable for any particular decision.
  • Defects in the Service will be corrected.
  • The Service will meet your specific requirements.

Nothing in these Terms limits or excludes any warranty, liability, or right that cannot be limited or excluded under mandatory law, including mandatory consumer protection law if you are a consumer.

13. Limitation of liability

To the fullest extent permitted by law:

  • We will not be liable for any indirect, incidental, special, consequential, exemplary, or punitive damages, including loss of profits, loss of revenue, loss of data, loss of goodwill, or loss of business opportunity, even if we have been advised of the possibility of such damages.
  • Our total aggregate liability to you arising out of or in connection with the Service and these Terms, whether in contract, tort (including negligence), or otherwise, is limited to the greater of (a) the amounts paid or payable by you or the Workspace Owner for the Workspace in which the claim arose during the twelve (12) months immediately preceding the event giving rise to the claim, or (b) one hundred euros (€100).
  • We are not liable for decisions you or your organisation make based on AI Outputs, research findings, recommendations, or any other content produced by the Service. The Service is a decision-support tool, not a decision-maker.
  • We are not liable for the content, accuracy, or availability of third-party services integrated with the Service, or for any acts or omissions of third-party AI providers, hosting providers, or other subprocessors acting within the scope of their instructions.

These limitations apply even if a limited remedy fails of its essential purpose. Nothing in this section limits liability for death or personal injury caused by negligence, fraud, or any other liability that cannot be excluded under applicable law.

14. Indemnification

You agree to indemnify, defend, and hold harmless Willow Stories FlexCo and its officers, directors, employees, and contractors from and against any claim, liability, loss, damage, cost, or expense (including reasonable legal fees) arising out of or related to:

  • Your Customer Data, including any claim that our processing of your Customer Data as instructed by you infringes a third party's rights or violates applicable law.
  • Your or your Workspace Members' violation of these Terms.
  • Your or your Workspace Members' violation of any applicable law or third-party right.
  • Your use of AI Outputs in a manner that causes harm to a third party.

We will notify you promptly of any claim for which we seek indemnification and will reasonably cooperate in the defence of such claim.

15. Intellectual property

All right, title, and interest in and to the Service — including the software, design, logos, documentation, and all improvements and derivative works — are and remain the exclusive property of Willow Stories FlexCo and its licensors. Except for the limited right to use the Service under these Terms, nothing in these Terms grants you any right, title, or interest in our intellectual property.

16. Changes to the Service and to these Terms

Service changes. The Service evolves. We may add, remove, or change features at any time. We will not make material, adverse changes to core features relied on by paying Workspaces without giving reasonable advance notice.

Terms changes. We may update these Terms from time to time. If we make material changes, we will notify the Workspace Owner by email and/or in-app notification at least 14 days before the changes take effect. Your continued use of the Service after the effective date constitutes acceptance of the revised Terms. If you do not agree to the revised Terms, you must stop using the Service before the effective date and may cancel your Subscription in accordance with section 11.

Non-material changes (clarifications, typo fixes, reorganisation that does not change meaning) may be made without notice.

17. Force majeure

Neither party is liable for any failure or delay in performance (other than payment obligations) caused by events beyond its reasonable control, including acts of God, natural disasters, war, terrorism, riots, epidemics or pandemics, governmental action, labour disputes, internet or power outages, failures of third-party infrastructure (including cloud providers and AI providers), or cyberattacks.

18. Governing law and jurisdiction

These Terms are governed by the laws of Austria, excluding its conflict-of-laws rules and excluding the United Nations Convention on Contracts for the International Sale of Goods (CISG).

Any dispute arising out of or in connection with these Terms or the Service will be subject to the exclusive jurisdiction of the competent courts of Vienna, Austria. For business-to-business disputes, the parties submit to the exclusive jurisdiction of the Handelsgericht Wien (Vienna Commercial Court). If mandatory law grants a consumer user the right to bring proceedings in the courts of their own habitual residence, nothing in this section limits that right.

19. Miscellaneous

Entire agreement. These Terms, together with our Privacy Policy and any order form or written agreement we have signed with you, constitute the entire agreement between you and us regarding the Service and supersede any prior agreements.

Severability. If any provision of these Terms is held to be invalid, illegal, or unenforceable, the remaining provisions continue in full force and effect. The invalid provision will be replaced by a valid one that reflects the original intent as closely as possible.

No waiver. Our failure to enforce any right or provision does not constitute a waiver of that right or provision.

Assignment. You may not assign or transfer these Terms, by operation of law or otherwise, without our prior written consent. We may assign these Terms freely, including in connection with a merger, acquisition, reorganisation, or sale of assets. Any unauthorised assignment by you is void.

Relationship. Nothing in these Terms creates any partnership, joint venture, agency, franchise, or employment relationship between the parties.

Notices. Notices from us to you will be sent to the email address associated with your Account. Notices from you to us should be sent to [email protected].

Language. These Terms are drafted in English. If we provide translations, the English version controls in case of discrepancy.

20. Contact

Questions about these Terms?
Willow Stories FlexCo
Rotenlöwengasse 15/5
1090 Vienna, Austria
Email: [email protected]