Last updated: October 6, 2026
These Terms of Service govern your use of products and services provided under the CapacityLab brand. By creating an account, funding a balance or confirming a Run, you agree to these Terms. The Privacy Policy, the Refund & Cancellation Policy and, for customers who connect their own systems, the Data Processing Agreement form part of them.
1. The service
CapacityLab helps customers define and run bounded load tests against applications they are authorized to test. You set the test parameters and success criteria, review the test plan and confirm it. The service then runs the test and records its result.
A test plan fixes the selected target, allowed requests, load bounds, evidence obligations and the exact price of the Run in US dollars. Confirming it creates the Run. After execution and evidence finalization, CapacityLab records whether the success criteria were met, not met or the result remains inconclusive.
The per-Run limits, prices and retention periods in force are published with their version date on the Limits and rules page, which is the source of their current values.
2. Accounts and authority
You are responsible for activity under your account and for keeping account access and API tokens secure. If you act for a company or other organization, you confirm that you have authority to accept these Terms for it.
You may test only systems you own or are expressly authorized to test. You are responsible for selecting the correct target, permitted paths, methods, request bodies, load bounds and test window, and for obtaining any third-party authorization that is required.
3. Customer information and credentials
You must provide accurate and lawful information. Do not send passwords, private keys, production credentials, secrets or unnecessary personal data through support, public forms or any channel not explicitly designated for secrets.
You are responsible for reviewing the immutable test plan before confirmation. A changed target, expired plan or different scope requires a new plan and review.
4. Credit balance
An account has one US-dollar credit balance. Credits do not expire. The current beta has no subscriptions, automatic renewal or monthly charges. Credit purchases are currently unavailable; Pricing states the current sales availability.
5. Test pricing and payment
Each test plan contains an exact US-dollar price. Confirmation accepts that price and deducts it from the balance when the test is created. Creating or reviewing a plan costs nothing. Insufficient balance refuses the launch without a charge; there is no overage. A free Smoke consumes no credits.
The payment integration uses Polar Software, Inc. ("Polar") as merchant of record. CapacityLab does not store complete payment-card details. The integration's existence does not mean beta sales are open.
6. Digital delivery
A confirmed test is delivered through CapacityLab: bounded load generation, execution evidence and a result. If no execution slot is available, confirmation is refused before charging; there is no test queue.
The result reflects only the target, scope, conditions and evidence available for that test. Missing or unverifiable evidence may make the result inconclusive.
7. Refunds and stopping a test
The Refund Policy describes test-price refunds as account credits. A member's Stop alone does not qualify for a refund. Returning credits to the balance and returning money through Polar are separate operations.
You can decline to confirm a plan without a charge. Account closure is a separate action in account settings; there is no subscription to cancel.
8. Service limitations
CapacityLab does not guarantee uptime, future production behavior, revenue, incident prevention, scalability, security or business results. Results from a bounded test may not predict behavior outside the tested conditions.
You remain responsible for engineering, infrastructure, deployment, operational and business decisions, and for ensuring that a test will not breach your agreements or harm third parties.
9. Intellectual property
You retain ownership of your systems, code, data and materials. CapacityLab retains ownership of its software, methods, templates, schemas, analysis processes and know-how.
Subject to these Terms, you may use the Run records, evidence and results delivered to your account for your internal engineering, operational and business purposes.
10. Acceptable use
You must not use CapacityLab to test a target without authorization, evade access controls, disrupt third parties, introduce malicious payloads, probe unrelated systems, or violate applicable law. CapacityLab may refuse or stop work that appears unsafe, unlawful or outside the confirmed scope.
11. Limitation of liability
To the maximum extent permitted by law, CapacityLab is not liable for indirect, incidental, special, consequential or business losses, including lost profits, lost revenue, downtime, data loss, production incidents or reputational harm.
To the maximum extent permitted by law, CapacityLab's total liability for a claim is limited to the amount paid for the service in the twelve months preceding the claim.
12. Changes to these Terms
CapacityLab may update these Terms from time to time. The latest version and its update date will remain available on this page. Changes do not rewrite the price or scope of a test plan already confirmed.
13. Supplier information
The service is offered under the CapacityLab brand at capacitylab.dev by _legal entity and registered address — to be completed by the owner_. For purchase, account or Terms questions, contact support@capacitylab.dev; for security and privacy matters, security@capacitylab.dev. The payment integration is described in section 5; beta sales are currently closed.