Terms of use

Checksum (checksum.guide) is a free study service run by Corratech LLC, [Mailing address] (“we” and “us”). By using Checksum, you agree to these terms. If you do not agree, please do not use it.

Checksum is free. There is no paid tier, no paywall and no card field, and we will never charge for it. We may add, change or remove features, and we may pause or end the service.

You sign in with a code or a link that we email you; there is no password. Anyone who can read your email can sign in as you, so keep your email account secure. An account is for one person.

You must be at least [Minimum age] years old to create an account. You can stop using Checksum at any time, and you can delete your account as the privacy page describes.

Please do not:

• copy, scrape or bulk-download the questions, answers or lessons, or use bots or scripts to do it;
• resell or republish Checksum content;
• try to get around rate limits or security, or get into anyone else’s account;
• use Checksum during a live certification exam;
• send us or share questions remembered from a real exam (see No dumps).

We may limit or suspend access for anyone who does.

Checksum’s lessons, questions, explanations and code are © Corratech LLC. You may use them for your own study.

Quotes from official documentation belong to their authors and appear under the licenses listed on the sources page. Each quote is credited where it appears.

If you send us a report or a suggestion, we may use it to improve Checksum. We thank you by name only if you choose that.

Every item is checked against the official documentation and approved by a person before it is published (see the method). Mistakes can still happen, and vendors change their services and exams. Checksum is a study aid, not a replacement for the vendor’s own documentation or exam guide. Always check the vendor’s pages for exam rules, prices and dates.

If you find an error, tap “Something off?” on the item. If we confirm it, you can choose to be thanked by name.

• No fake timers, fake scarcity, fake reviews, invented statistics or pass guarantees. We tell you what the vendor measures and help you practice it.
• No exam dumps. Every question is original and written from the official documentation.
• Your data is yours. You can have it exported or deleted.
• Report a factual error that we confirm, and you can choose to be thanked by name.
• Tips are optional. They come with no perks, and nothing changes if you never give.

Tips are optional. They are paid on a Stripe payment page and go to Corratech LLC, which runs Checksum. A tip is a thank-you for a free service, not a donation, and it is not tax-deductible. It buys no perks or features, and Stripe’s own terms apply to the payment.

[Tip refund policy]

Checksum is an independent study platform and is neither affiliated with, nor authorized, sponsored, or approved by, Amazon Web Services, Inc., Microsoft Corporation, or LeetCode. AWS, Amazon Web Services, AWS Certified and the names of AWS certifications are trademarks of Amazon.com, Inc. or its affiliates. Microsoft, Azure, Microsoft Certified and the names of Microsoft certifications are trademarks of the Microsoft group of companies. All other trademarks are the property of their respective owners.

Checksum is provided “as is” and “as available”. To the extent the law allows, we make no warranties of any kind, including that Checksum is free of errors, that it will always be available, or that it will help you pass an exam.

To the extent the law allows, Corratech LLC is not liable for indirect, incidental or consequential losses, including a failed exam, lost time or a lost opportunity. Our total liability for any claim about Checksum is limited to [Liability cap].

We may update these terms. The new version will appear on this page with a new date, and we will give notice on the site before a significant change takes effect. If you keep using Checksum after that, the new terms apply.

These terms are governed by the laws of the State of [Governing-law state], without regard to its conflict-of-law rules. Any dispute will be heard in the courts of [Venue for disputes].

Email [email protected], or write to Corratech LLC, [Mailing address].