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Terms and Conditions

Last updated: May 5, 2026

These Terms and Conditions ("Terms") govern your use of rungs.dev and studio.rungs.dev (the "Service") operated by Techsolid Automation Limited ("we", "us", "our"). By using the Service, you agree to these Terms.

The Service​

rungs.dev is a browser-based PLC programming environment for creating, editing, simulating, and testing Add-On Instructions (AOIs) using Structured Text and Ladder Logic. The Service runs entirely in your browser — your projects are stored locally and are not uploaded to our servers unless you use the Share feature.

No Warranty — Not for Production Use​

The Service is provided "as is" and "as available" without warranties of any kind, whether express or implied.

IMPORTANT: The Service is an educational and development tool. It is NOT certified for use in industrial control systems, safety-critical applications, or production PLC environments. You must not rely on simulations or test results from this Service as validation for real-world PLC deployments. Always verify logic independently using certified tools before deploying to physical hardware.

We do not warrant that:

  • The Service will be uninterrupted, error-free, or available at all times
  • Simulation results will be accurate or match the behavior of any specific PLC platform
  • Your locally stored data will be preserved (browser storage can be cleared by the browser or operating system at any time)

Your Content​

Ownership​

You retain full ownership of the AOIs and programs you create using the Service. We claim no rights over your content.

Shared Content​

When you use the Share feature:

  • Your AOI is uploaded and made publicly accessible — anyone with the link can view and fork it
  • You represent that you have the right to share the content and that it does not violate any third party's intellectual property rights
  • You grant us a non-exclusive, worldwide license to host, display, process, and use the shared AOI to operate, secure, and improve the Service, including developing, evaluating, and training machine learning and AI features
  • We may remove shared content at our discretion, including content that violates these Terms

Prohibited Content​

You must not share AOIs that:

  • Contain malicious code or are designed to cause harm
  • Infringe on intellectual property rights of others
  • Contain confidential or proprietary information belonging to a third party

AI Features (Relay)​

Relay is the AI tutor available in Studio's right sidebar. By using Relay, you agree to the following:

  • Educational only. Relay's replies are unverified suggestions from a large language model. They are not professional engineering advice, and they are not certified for use in industrial control or safety-critical applications. Always verify any code, instruction, or claim Relay produces using Studio's own compile, simulate, and test tools, and against authoritative manufacturer documentation.
  • Replies can be wrong. Like any AI assistant, Relay can produce incorrect, incomplete, or out-of-date answers, including answers about Studio itself. Treat them as a starting point, not a finished solution.
  • Your input is sent to a third-party model provider. When you send a message, Studio sends your prompt and your current AOI's tags and code to our studio-assist server, which forwards them to a third-party large language model provider. See the Privacy Policy for details on what is sent, the current provider, and how data is retained.
  • Traces are reviewed. We capture and store each Relay turn (prompt, reply, model, latency, anonymous session identifier, and any feedback) for service quality and improvement, and we may read individual turns when investigating bugs or evaluating Relay's behavior.
  • Free during early access. Relay is currently free. We may introduce paid AI features later, with separate billing terms posted before they take effect.

Do not paste secrets, credentials, customer data, or proprietary logic into Relay.

Acceptable Use​

You agree not to:

  • Attempt to disrupt, overload, or interfere with the Service
  • Circumvent rate limits or other technical restrictions
  • Use automated tools to scrape or bulk-download content from the Service
  • Use the Service for any unlawful purpose
  • Reverse engineer or attempt to extract source code beyond what is publicly available in our repository

Data and Storage​

  • Local storage: Your projects are stored in your browser's localStorage. We do not back up or recover this data. You are responsible for exporting and backing up your own work.
  • Shared AOIs: Publicly shared AOIs are stored on our infrastructure. We may remove inactive shares or impose storage limits.
  • Analytics: We collect usage analytics and technical telemetry as described in our Privacy Policy.

Service Availability​

We may modify, suspend, or discontinue any part of the Service at any time without notice. We are not liable for any loss resulting from service interruptions or changes, including loss of locally stored data.

Intellectual Property​

The Service, including its design, code, documentation, and branding, is owned by Techsolid Automation Limited. The rungs.dev name and logo are our trademarks.

No right to access, copy, or use our source code is granted unless explicitly provided in a separate written license agreement.

Limitation of Liability​

To the maximum extent permitted by law, Techsolid Automation Limited and its directors, employees, and affiliates shall not be liable for any indirect, incidental, special, consequential, or punitive damages, or any loss of profits, data, or business opportunities arising from your use of the Service.

Our total liability for any claim arising from your use of the Service shall not exceed the amount you have paid us in the 12 months preceding the claim (which may be zero if you use the free tier).

Indemnification​

You agree to indemnify and hold harmless Techsolid Automation Limited from any claims, damages, or expenses arising from your use of the Service or violation of these Terms, including any content you share through the Service.

Governing Law​

These Terms are governed by the laws of Ireland. Any disputes shall be subject to the exclusive jurisdiction of the courts of Ireland.

Changes to These Terms​

We may update these Terms from time to time. Continued use of the Service after changes constitutes acceptance of the updated Terms. Material changes will be posted on this page with an updated "Last updated" date.

Contact​

For questions about these Terms, contact us at:

Techsolid Automation Limited Email: legal@techsolid.io