4DA Systems Pty Ltd · Effective Date: 15 March 2026 · Last Updated: 15 March 2026
4DA Systems is an independent software company based in Queensland, Australia. We build tools for developers who value their privacy and their time.
These Terms of Service exist to set clear expectations for both parties. We have written them in plain English where possible and with legal precision where necessary. If something is unclear, contact us and we will explain it.
We respect the people who use our software. We expect the same respect in return. These terms protect both of us.
By downloading, installing, or using the 4DA desktop application ("the App"), or by subscribing to any paid tier, you agree to be bound by these Terms. If you do not agree to these Terms, do not use the App.
These Terms constitute a legally binding agreement between you ("User", "you") and 4DA Systems Pty Ltd (ACN 696 078 841, ABN 51 696 078 841), a company registered in Queensland, Australia ("4DA Systems", "we", "us", "our").
We may update these Terms from time to time (see Section 15). Your continued use of the App after changes take effect constitutes acceptance of the updated Terms.
4DA is a local-first desktop application that surfaces developer-relevant content from the internet -- privately, locally, and with minimal configuration.
The App:
The App does not:
The Free tier includes:
The Free tier is provided at no cost and may be used indefinitely. We reserve the right to modify Free tier features with reasonable notice, but we will not retroactively remove core scoring functionality from existing Free tier users without a compelling reason.
The Signal tier includes everything in the Free tier, plus:
We may introduce additional subscription tiers (such as Team or Enterprise) in the future. Any new tiers will be subject to these Terms and any additional terms specific to those tiers, which will be presented at the time of purchase.
Prices are in US Dollars and are exclusive of any applicable taxes. We will display applicable taxes at checkout where required by law. We reserve the right to change pricing with at least 30 days' notice. Price changes will not affect your current billing period.
Payment is processed through our payment provider (currently Stripe). By subscribing to the Signal tier, you authorise recurring charges at the applicable billing interval until you cancel.
4DA Systems does not store your payment card details. All payment information is handled directly by our payment processor in accordance with PCI-DSS standards. See Stripe's Privacy Policy for details on how Stripe handles your payment data.
Your subscription begins on the date of your first payment and renews automatically unless cancelled before the next billing date.
Signal tier users receive a license key validated through Keygen. Your license key is personal to you and must not be shared, redistributed, or used on more devices than your subscription permits. License validation sends only your license key and a machine fingerprint (a hardware-derived hash) to the Keygen API -- no personal data, device fingerprints beyond this hash, or other identifying information is transmitted.
You may cancel your Signal subscription at any time. Upon cancellation:
If your subscription lapses due to cancellation, non-payment, or expiry:
If you purchase an annual Signal subscription and are not satisfied, you may request a full refund within 14 days of your initial purchase. No reason is required. To request a refund, contact us at support@4da.ai.
This guarantee applies to first-time annual Signal subscriptions only. Subsequent annual re-subscriptions are not eligible for the 14-day guarantee, though they remain subject to your statutory rights.
If you purchase a monthly Signal subscription and are not satisfied, you may request a prorated refund within 30 days of your initial purchase. The refund amount will be calculated based on the unused portion of your current billing period. To request a refund, contact us at support@4da.ai.
This prorated refund applies to first-time monthly Signal subscriptions only. Subsequent monthly charges after the initial 30-day period are not eligible for prorated refunds, though they remain subject to your statutory rights.
If the Signal tier does not work as described -- for example, if Signal features fail to activate after a valid purchase, or if a defect prevents you from using features you have paid for -- you are entitled to a full refund regardless of the refund periods stated above. Contact us at support@4da.ai and describe the issue.
Our goods and services come with guarantees that cannot be excluded under the Australian Consumer Law ("ACL"). For major failures with the service, you are entitled to:
You are also entitled to choose a refund or replacement for major failures with goods. If a failure with goods or services does not amount to a major failure, you are entitled to have the failure rectified in a reasonable time. If this is not done, you are entitled to a refund for the goods or service.
Nothing in these Terms limits or excludes any rights you have under the Australian Consumer Law or any other applicable consumer protection legislation.
Refund requests should be sent to support@4da.ai. We aim to process approved refunds within 10 business days. Refunds are issued to the original payment method via our payment processor.
The 4DA source code is released under the Functional Source License, Version 1.1, Apache 2.0 Future License (FSL-1.1-Apache-2.0). This is a source-available license. It is not an "open source" license in the Open Source Initiative (OSI) sense. Under this license:
If there is any conflict between these Terms and the FSL-1.1-Apache-2.0 license regarding use of the source code, the FSL license governs.
Subject to your compliance with these Terms and the FSL-1.1-Apache-2.0 license, 4DA Systems grants you a limited, non-exclusive, non-transferable, revocable license to download, install, and use the compiled 4DA application on your personal or business devices for your own internal use.
This license does not grant you the right to:
"4DA", "4 Dimensional Autonomy", and the 4DA logo are trademarks of 4DA Systems Pty Ltd (ACN 696 078 841, ABN 51 696 078 841). Australian trademark applications: TM 2629468, TM 2631247, TM 2631246.
The FSL-1.1-Apache-2.0 license does not grant any rights to use 4DA Systems' trademarks. You may not use the 4DA name, logo, or any confusingly similar marks without prior written permission, except as necessary to refer to 4DA or its products in a factual, non-misleading manner consistent with fair use principles.
Contributions to the 4DA codebase are welcome and are subject to the FSL-1.1-Apache-2.0 license. We may implement a Contributor License Agreement (CLA) in the future to ensure we can maintain and distribute the software effectively. If a CLA is introduced, contributors will be notified and asked to sign it before new contributions are accepted.
The App incorporates third-party open-source components, each governed by their respective licenses. A list of these components and their licenses is included with the App distribution.
The App allows you to provide your own API keys for third-party LLM providers (e.g., OpenAI, Anthropic, Google) and other AI services, as well as local providers such as Ollama. You are solely responsible for:
4DA Systems does not store, transmit, or have access to your API keys. They are held locally on your device. 4DA Systems is not responsible for, and has no liability for, any costs you incur with third-party AI service providers through your use of the App.
We recommend that you set usage limits and billing alerts with your API providers to avoid unexpected charges.
When using Ollama as your LLM provider, all AI processing occurs locally on your machine. No external API calls are made and no API key is required.
You are responsible for:
You agree not to:
4DA scores and ranks content using algorithms (including the PASIFA scoring engine, embedding-based semantic matching, and optional LLM-powered re-ranking). These scores represent algorithmic assessments of relevance based on your development context.
4DA Systems does not guarantee the accuracy, completeness, reliability, relevance, or timeliness of any content scores, rankings, or analysis produced by the App. Content is sourced from public internet sources and scored algorithmically. Scores and rankings may contain errors, may not reflect the true relevance of content to your needs, and should be treated as supplementary signals -- not authoritative assessments.
You should not rely solely on 4DA scores or analysis for critical business, technical, or professional decisions.
The App aggregates content from public, third-party sources including (but not limited to) Hacker News, Reddit, GitHub, arXiv, and RSS feeds. 4DA Systems:
Your use of or reliance on any third-party content is at your own risk.
Signal tier features include AI-generated briefings, analysis, summaries, and natural language search results. These are produced by large language models and may contain errors, omissions, hallucinations, or inaccuracies. AI-generated content is not verified by 4DA Systems and should not be relied upon as a sole source of information for any decision.
The App does not provide financial, legal, investment, medical, or any other form of professional advice. All content surfaced and analysis produced by the App is for informational purposes only.
To the maximum extent permitted by applicable law (including the Australian Consumer Law):
The App is provided "as is" and "as available" without warranties of any kind, either express or implied. 4DA Systems expressly disclaims all implied warranties, including but not limited to implied warranties of merchantability, fitness for a particular purpose, title, and non-infringement.
Without limiting the foregoing, 4DA Systems does not warrant that:
Nothing in these Terms excludes, restricts, or modifies any statutory guarantee, right, or remedy conferred on you by the Australian Consumer Law or any other applicable legislation that cannot be excluded, restricted, or modified by agreement.
To the maximum extent permitted by applicable law (including the Australian Consumer Law):
Nothing in these Terms excludes, restricts, or modifies any guarantee, right, or remedy conferred on you by the Australian Consumer Law or any other applicable legislation that cannot be excluded, restricted, or modified by agreement.
You agree to indemnify, defend, and hold harmless 4DA Systems, its officers, directors, employees, and agents from and against any claims, liabilities, damages, losses, and expenses (including reasonable legal fees) arising out of or in connection with:
This indemnification obligation does not apply to the extent that a claim arises from 4DA Systems' own negligence, wilful misconduct, or breach of these Terms.
All data generated and used by the App -- including your database, settings, API keys, and preferences -- is stored locally on your device. 4DA Systems does not have access to, does not back up, and cannot recover your local data.
You are solely responsible for maintaining backups of your local data. 4DA Systems is not liable for any loss of data resulting from hardware failure, software issues, accidental deletion, or any other cause.
Upon termination or uninstallation of the App, your local data remains on your device. Because 4DA Systems never has possession of your data, there is nothing for us to delete on our end. You may delete your local data at any time by removing the App's data directory from your device.
For information about how data is processed and what minimal data is transmitted during license validation and content fetching, please refer to our Privacy Policy.
Our collection and use of personal information is governed by our Privacy Policy, which is incorporated into these Terms by reference. By using the App, you acknowledge that you have read and understood our Privacy Policy.
If you are located in the European Economic Area (EEA), United Kingdom, or Switzerland, you have rights under the General Data Protection Regulation (GDPR) including the rights of access, rectification, erasure, restriction, portability, and objection. Because the App processes data locally on your device, most of these rights are automatically satisfied. For any personal data we process (such as through license validation or payment), please refer to our Privacy Policy for full details on how to exercise your rights.
If you are a California resident, you have rights under the California Consumer Privacy Act (CCPA) including the rights to know, delete, and opt out of the sale of personal information. We do not sell personal information. For full details, please refer to our Privacy Policy.
We comply with the Australian Privacy Act 1988 (Cth) and the Australian Privacy Principles. For details on how we handle personal information and how to make a privacy request, refer to our Privacy Policy.
We may update these Terms from time to time. When we make material changes:
Continued use of the App after the effective date of updated Terms constitutes your acceptance of those changes.
Non-material changes (such as formatting corrections or clarifications that do not affect your rights) may be made without advance notice.
You may stop using the App and uninstall it at any time. If you have a Signal subscription, you should cancel it before uninstalling to avoid further charges.
We may suspend or terminate your license key or access to Signal features if:
Where practicable, we will provide notice before termination and an opportunity to remedy the breach. Immediate termination without notice may occur in cases of fraud, serious misconduct, or where continued access poses a risk to the integrity of our systems.
Upon termination of your Signal subscription or license:
These Terms are governed by and construed in accordance with the laws of the State of Queensland, Australia, without regard to conflict of law principles.
Before initiating any formal legal proceedings, both parties agree to follow this dispute resolution process:
Nothing in this section limits your right to bring proceedings in any court or tribunal where you are entitled to do so under applicable consumer protection legislation, including the Australian Consumer Law. Nothing in this section prevents either party from seeking urgent injunctive or equitable relief from a court of competent jurisdiction.
The App is available for download globally. You are responsible for ensuring that your download, installation, and use of the App complies with all applicable export control laws, sanctions, and regulations in your jurisdiction, including (without limitation):
You represent and warrant that:
4DA Systems makes no representation that the App is appropriate or available for use in all jurisdictions. If you access or use the App from outside Australia, you do so at your own initiative and are responsible for compliance with local laws.
You must be at least 16 years of age to use the App. By using the App, you represent and warrant that you meet this requirement.
If you are between 16 and 18 years of age (or the age of legal majority in your jurisdiction), you represent that you have the consent of a parent or legal guardian to use the App and that your parent or legal guardian has read and agrees to these Terms on your behalf.
We do not knowingly collect personal information from children under the age of 13 (or under 16 in jurisdictions where GDPR applies). If you believe a child under the applicable age has used the App or provided personal information to us, please contact us at privacy@4da.ai.
If you have questions about these Terms, contact us:
4DA Systems Pty Ltd
ACN 696 078 841 | ABN 51 696 078 841
Queensland, Australia
Copyright 2025-2026 4DA Systems Pty Ltd. All rights reserved.