Terms of Use
1. The service, your account and your content
By creating an account or using keystone-core.pro you accept these Terms. If you use Keystone for a company, you accept them on its behalf and confirm you may do so. Keystone is run by Igor Saenko, a private individual in Serbia ("we").
The service. Keystone lets you draw and keep C4 architecture models, ER diagrams, scenarios and decisions, work on them with your team, and connect AI tools over MCP that read your code locally and propose changes.
Your account. Give accurate details and keep your password and AI tokens secret. You are responsible for what happens under your account and your tokens; revoke a token at once if it leaks.
Acceptable use. Do not:
- break the law or others' rights with what you store or share;
- try to reach projects or data you were not given access to, or probe our security without written permission;
- overload the service, scrape it, or get around rate limits;
- upload malware or other people's personal data without a legal basis.
Your content stays yours. You own your diagrams and everything you put into Keystone. You give us only the limited right to store, process and show it to the people you share it with, so we can run the service. We do not use your content to train AI models.
AI connections. Proposals from an AI change nothing until a person applies them. AI output can be wrong: check it before you rely on it. Your use of an AI tool is governed by its provider's terms, not ours.
2. Plans, liability and ending the agreement
Plans. The hosted service at keystone-core.pro has a free plan with limits. For companies we offer a self-hosted edition deployed inside your own network; it is licensed under a separate agreement, and these Terms do not cover it. If we introduce paid plans for the hosted service, we will tell you in advance and nothing you already have will be charged without your consent.
Availability. We work to keep Keystone running and your data safe, but the free service comes without an uptime guarantee. Export your projects regularly; we may change or remove features, and will give notice before removing one you use.
No warranty. Keystone is provided "as is". We do not promise that diagrams, AI proposals or validation reports are complete or match your code.
Liability. To the extent the law allows, we are not liable for indirect or consequential losses, lost profits or lost data, and our total liability for the free service is limited to EUR 100. Nothing here limits liability that cannot be limited by law, such as for intent or gross negligence, or your rights as a consumer.
Ending. You can stop at any time by deleting your account. We may suspend or close an account that breaks these Terms, with notice where we can, and you keep the right to export your projects for 30 days unless the law or safety forbids it.
Law and disputes. The law of the Republic of Serbia applies, and the competent courts of Serbia decide disputes. If you are a consumer in the EU, you keep the protection of the law of your country.
Contact. runafterasun@gmail.com.