Terms of Service
Last updated: 15 August 2026
These terms are the agreement between you and us for the CRAYON-C4 service (the “Service”) — the web application at crayon-c4.com, its documentation, the command-line tools and the editor extensions. By creating an account or using the Service you accept these terms. If you do not accept them, do not use the Service.
1. Who you are contracting with
- Legal entity
- SQUORA
- Registered address
- W.F. Hermansstraat 526, 3544 KP Utrecht, The Netherlands
- Chamber of Commerce (KvK)
- 42105674
- VAT number
- NL001924069B86
You can reach us at any time through the support page. We answer support requests in writing, in English or Dutch.
2. Accounts
Parts of the Service work without an account. For everything else you sign in through an identity provider we support. You are responsible for the security of the account you sign in with, and for everything done through it. Tell us through the support page if you believe your account has been used without your permission.
You must be at least 16 years old, or the age of digital consent in your country if that is higher, to hold an account.
3. Plans and prices
There is a free tier that needs no payment and no card, and a paid Pro plan. Pro is charged per account — not per person — and includes collaborators on your projects up to the member limit shown on the pricing page.
| Plan | Price excl. VAT | Billed |
|---|---|---|
| Pro, monthly | €15.00 | Every month, in advance |
| Pro, yearly | €150.00 | Every year, in advance |
Prices are quoted excluding VAT. VAT is added at checkout at the rate of your own country — for a private customer in the Netherlands that is €18.15 per month incl. 21% Dutch VAT. A business in another EU member state that supplies a valid VAT identification number is reverse-charged and pays no VAT to us. The exact amount is always shown before you confirm the payment.
4. Payment, renewal and price changes
Payments are handled by Stripe. We never see or store your card details. Your subscription renews automatically at the end of each billing period at the then-current price, until you cancel it.
We may change the price of a plan. We will tell you by email at least 30 days before a change takes effect for you, and the change only applies from your next renewal — never mid-period. If you do not accept the new price, cancel before that renewal.
If a payment fails we will retry it and email you. If it keeps failing, your subscription ends and the account returns to the free tier. Your projects are not deleted when this happens; see section 8.
5. Cancelling
You can cancel at any time from Settings → Subscription → Manage subscription. Cancelling stops the next renewal. You keep Pro access for the rest of the period you have already paid for, and we do not refund the unused part of that period except where section 6 or the law requires it.
6. Right of withdrawal for consumers
If you are a consumer in the European Union you have 14 days from entering into the contract to withdraw from it without giving a reason.
Pro access is a digital service that starts immediately. By completing checkout you ask us to begin providing it at once and acknowledge that you lose the right of withdrawal once we have fully performed. If you withdraw within the 14 days while the service is still being provided, you owe an amount proportionate to what you used before withdrawing, and we refund the rest.
To withdraw, tell us through the support page — a clear statement is enough, there is no form to fill in. We refund using the same payment method, within 14 days of being told.
7. Acceptable use
You agree not to:
- break the law, or infringe anyone’s rights, using the Service;
- upload content you have no right to upload, or that is unlawful, malicious, or designed to harm other users;
- try to gain access to accounts, data or systems that are not yours, or probe or disrupt the Service’s security;
- place a load on the Service that is out of proportion to normal use, including automated bulk requests we have not agreed to;
- resell, sublicense or provide the Service to third parties as a service of your own, other than by sharing projects with collaborators as the product allows.
If you break these rules we may suspend or end your access. Where it is reasonable to do so we will warn you first and give you a chance to put it right.
8. Your content stays yours
The architecture models, diagrams, decisions, text and files you put into the Service are yours. You grant us only the permission we need to run the Service for you: to store your content, process it, display it back to you, and show it to the people you have shared it with — including anyone holding a read-only link you have published. That permission ends when you delete the content or your account.
We do not use your content to train machine-learning models, and we do not sell it or share it for advertising.
You can export everything at any time, on every plan, in an open JSON format — including after a subscription ends. If your subscription lapses, cloud projects become read-only rather than being deleted: you keep them, you keep the ability to export them, and you can edit them again by subscribing again. Retention is described in the disclaimer.
The Service itself — its software, design, documentation and brand — remains ours. Nothing here transfers ownership of it to you.
9. Availability and changes to the Service
We work to keep the Service available and reliable, but we do not promise uninterrupted operation, and we may change, add or withdraw features. If we withdraw something a paying customer materially relies on, we will give notice by email and, if you cancel because of it, refund the unused part of the period you have paid for.
The Service is provided “as is” to the extent the law allows. The full warranty position, and your responsibility for keeping your own backups, are in the disclaimer, which forms part of these terms.
10. Liability
Nothing in these terms excludes liability for death or personal injury caused by our negligence, for fraud, or for anything else that cannot be excluded by law. Subject to that, and to the extent the law allows, our total liability to you arising out of or in connection with the Service in any 12-month period is limited to the amount you paid us for the Service in that period.
We are not liable for indirect or consequential loss, or for loss of profit, revenue, goodwill or data, however caused. If you are a consumer, this section does not affect your statutory rights.
11. Ending the agreement
You may stop using the Service and delete your account at any time from Settings → Danger zone. We may end this agreement on reasonable notice, or immediately if you seriously or repeatedly break section 7. If we end it without cause while you are on a paid plan, we refund the unused part of the period you have paid for.
Export your projects before deleting your account. Deletion is irreversible and we cannot recover deleted content for you.
12. Changes to these terms
We may update these terms. For a change that materially affects a paying customer we will give at least 30 days’ notice by email, and it takes effect at your next renewal. Continued use after that is acceptance. If you do not accept a change, cancel before it takes effect.
13. Law and disputes
These terms are governed by the law of the Netherlands. Disputes go to the competent court in the Netherlands. If you are a consumer, this does not deprive you of the protection of the mandatory law of the country where you live, and you may bring proceedings in the courts of that country.
Consumers in the EU may also use the European Commission’s online dispute resolution platform at ec.europa.eu/consumers/odr. We would rather hear from you first, through the support page.
14. Related documents
- Privacy notice — what personal data we process, why, and who processes it with us.
- Disclaimer — warranty, your backups, retention and limitation of liability.