License agreement

Shown here as published on November 12, 2026

MathSheet is licensed, not sold. Your use of MathSheet is governed by the End User License Agreement below - the same text MathSheet shows when you install it and in Help › Licence agreement. Purchases are processed by our reseller, Lemon Squeezy, under its own buyer terms. See also the privacy policy and refund policy.

Trademarks

MathSheet and Sheetwise Engineering are names of Sheetwise Engineering LLC. Other product names belong to their owners. MathSheet is an independent product and is not affiliated with, endorsed by or sponsored by any other software maker.

End User License Agreement

MathSheet - END USER LICENCE AGREEMENT (TERMS OF USE)

Version: 2.1 (12 November 2026)
Publisher: Sheetwise Engineering LLC, an Arizona limited liability company

1. ACCEPTANCE
This End User Licence Agreement ("Agreement") is a legal agreement between you (an individual, or the company or organisation you install or use the software for) and Sheetwise Engineering LLC, an Arizona limited liability company, the publisher of MathSheet ("Publisher"), for the MathSheet software, the engineering math worksheet program, including its program files, help pages, lessons, example sheets, documentation and updates ("Software"). By clicking "I Agree" when installing, or by installing, copying or using the Software, you agree to this Agreement. If you do not agree, do not install or use the Software. If you accept for a company or organisation, you confirm that you are authorised to bind it. SECTION 20 CONTAINS AN AGREEMENT TO ARBITRATE DISPUTES AND A CLASS-ACTION WAIVER.

2. LICENCE
2.1 Licence. When you have paid for the Software, or received a licence key for an introductory year (section 2.2), and entered a valid licence key, the Publisher grants you a non-exclusive, non-transferable, revocable licence to install and use the Software for your own design and engineering work on one computer that you own or control, for as long as the licence key is valid and you keep to this Agreement. A licence key bought from the Publisher's online shop is activated for one computer at a time (see section 11). A licence key that the Publisher makes for a computer's code works only on that computer. If you replace the computer, the Publisher will move your licence to the new one (contact the Publisher). A licence bought by a company or other organisation may be used by one person at a time on one computer.

2.2 Introductory year. As an introductory offer, the Publisher may give new subscribers a licence key free of charge that is valid for one (1) year from the day it is issued ("introductory year"). No payment details are needed and nothing is charged automatically. Renewal after the introductory year may be free of charge or paid, as the Publisher decides: the Publisher reserves the right to charge for the Software, and for continued use of it, after the introductory year ends. Before the introductory year ends, the Publisher will tell you by e-mail whether renewal is free or its price, and the terms to continue. If you do not continue, the licence ends when the introductory year ends and section 2.3 applies. The Publisher may end or change the introductory offer for new subscribers at any time; this does not shorten an introductory year already given.

2.3 When there is no valid licence key. Without a valid licence key, including after a licence for a limited time (such as the introductory year) ends, the Software works as a viewer: you can open and print worksheets, but not save or change them.

2.4 All rights not expressly granted are reserved by the Publisher.

3. RESTRICTIONS
Except as expressly permitted by applicable law, you may not: (a) copy the Software except for installation and one backup copy; (b) modify, translate, decompile, disassemble or reverse engineer it; (c) sell, rent, lease, lend, share, sublicense, distribute or otherwise transfer it, this licence or your licence key; (d) remove or alter any notice of ownership, copyright or licence; (e) use it to build a competing product; or (f) remove or circumvent any licence key, licence check or other technical protection.

4. OWNERSHIP
The Software is licensed, not sold. The Publisher and its licensors own all title, copyright and other intellectual property rights in the Software. Your worksheets are yours: everything you create with the Software (.msheet files, printouts, exported pages and documents, and their results) belongs to you, and you may use it for any purpose.

5. ENGINEERING RESULTS AND YOUR RESPONSIBILITY
The Software is a math worksheet: it calculates results from the equations, values, units, functions and settings you enter, using numerical and symbolic methods. Its results, including roots, solve-block answers, fitted values, symbolic answers and graphs, are calculations from your inputs, not measurements, and may be inaccurate or incomplete, for example because of input or typing errors, wrong units or values, definitions in the wrong order, numerical limits (rounding, tolerances, iteration limits, a solver finding a different root or none), imported files, or errors in the Software. You are solely responsible for checking every result by independent means (hand calculation, other tools, and tests and measurements on real hardware) before you rely on it, and for the design, safety, regulatory compliance, certification and performance of anything you design, build or sell. The help pages, lessons and example sheets explain the math and the Software; they are not professional engineering advice.

6. ACCURACY OF RESULTS AND RELIANCE
The Software provides answers that are believed to be accurate, but their accuracy, completeness and suitability are never guaranteed. You must independently verify every result and every design you use the Software for (by independent calculation, other tools and tests on real hardware) before you rely on it or put it into use, in particular where a failure could cause death, personal injury, fire, or damage to property or the environment. Any reliance on the Software or its results is entirely at your own risk, and you alone are responsible for every decision, design and product based on them.

7. DISCLAIMER OF WARRANTIES
THE SOFTWARE IS PROVIDED "AS IS" AND "AS AVAILABLE", WITH ALL FAULTS AND WITHOUT WARRANTY OF ANY KIND. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THE PUBLISHER DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS, IMPLIED OR STATUTORY, INCLUDING ANY WARRANTIES OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, NON-INFRINGEMENT, AND THAT THE SOFTWARE OR ITS RESULTS WILL BE ERROR-FREE, UNINTERRUPTED OR MEET YOUR REQUIREMENTS.

8. LIMITATION OF LIABILITY
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT WILL THE PUBLISHER, ITS AUTHORS OR LICENSORS BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, EXEMPLARY OR PUNITIVE DAMAGES, OR FOR ANY LOSS OF PROFITS, REVENUE, DATA, PRODUCTION OR GOODWILL, BUSINESS INTERRUPTION, COST OF REDESIGN, RECALL OR SUBSTITUTE PRODUCTS, OR PRODUCT FAILURE, ARISING OUT OF OR RELATED TO THE SOFTWARE, ITS USE OR INABILITY TO USE IT, OR RELIANCE ON ITS RESULTS, HOWEVER CAUSED AND UNDER ANY THEORY OF LIABILITY, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE PUBLISHER'S TOTAL LIABILITY FOR ALL CLAIMS WILL NOT EXCEED THE AMOUNT YOU PAID FOR THE SOFTWARE IN THE TWELVE (12) MONTHS BEFORE THE CLAIM AROSE, OR, IF YOU PAID NOTHING, FIFTY (50) US DOLLARS. Some jurisdictions do not allow the exclusion or limitation of certain warranties or damages; in those jurisdictions the exclusions and limits above apply to the fullest extent allowed.

9. INDEMNITY
You agree to defend, indemnify and hold harmless the Publisher, its authors and licensors from any claim, loss, damage, liability, cost or expense (including reasonable legal fees) arising from your use of the Software or its results, from products or designs you make with it, or from your breach of this Agreement.

10. THIRD-PARTY COMPONENTS
The Software contains open-source libraries and fonts (MathLive, KaTeX and its fonts, math.js, nerdamer, nspell and the SCOWL dictionaries, the Microsoft WebView2 SDK, and the small parts bundled inside them). Each is covered by its own licence, not by this Agreement; their licence texts come with the Software in the folder lib\licenses and in Help > About MathSheet > Licences, and nothing in this Agreement limits your rights under those licences. The Windows version uses the Microsoft Edge WebView2 Runtime that is part of Windows; it is covered by Microsoft's own terms.

11. YOUR DATA AND PRIVACY
11.1 Your work stays on your computer. Your worksheets, calculations, autosaves, templates and settings are stored only on your computer, or wherever you choose to save them. The Software does not send them to the Publisher or to anyone else. Worksheets, files and values you open, import or enter remain your responsibility; the Software does not check that they are correct or that you are entitled to use them.

11.2 Online licence activation. If you use a licence key bought from the Publisher's online shop, the Software contacts the licence service of the Publisher's reseller (currently Lemon Squeezy) over the internet: (a) once, when you enter the key; (b) afterwards, about once every 30 days when the computer is online, to check that the licence is still valid; and (c) if the licence is moved off the computer. It sends the licence key and either the computer code (when activating) or the activation number the service gave (when checking or moving). Like any internet connection, this also shows the service your computer's internet (IP) address.

11.3 The computer code. The computer code is a short code calculated by a one-way function from the identifier Windows creates when it is installed (or, if that is missing, from the computer's name). It does not contain your name or your files. Because it stays the same for that Windows installation, it can identify that computer, so the Publisher treats it as personal information.

11.4 What is kept on your computer. After activation, the service's answer (the licence key, the activation number, the name and e-mail address of the buyer and the product name) is kept on your computer, protected by Windows for your Windows user account, so the Software can show who it is licensed to and work offline. The Software also keeps the dates it was first and last started, the date you accepted this Agreement and, if the Software has a fault, an error log on your computer. These stay on your computer; the error log is sent to the Publisher only if you choose to send it. Removing the Software leaves the licence and these dates in place, so installing it again needs no new key.

11.5 Working offline. After activation the Software works without the internet. If the computer is offline or the licence service cannot be reached, the Software keeps working. The licence is removed from a computer only if the service clearly answers that the licence is no longer valid (for example after a refund, after the licence was moved, or after a licence for a limited time has ended) on two checks at least 3 days apart.

11.6 Keys made for one computer. A licence key that the Publisher makes for a computer's code (sent by e-mail) is checked on your computer without the internet. To get such a key you send the Publisher the computer code; the key contains the name and e-mail address you give.

11.7 Other services. Web links in the Software open in your web browser. The Windows version shows its pages with the Microsoft Edge WebView2 Runtime, which is part of Windows and is covered by Microsoft's own terms and privacy statement. Purchases are handled by the Publisher's reseller under its own terms and privacy policy.

11.8 The Publisher's privacy policy at https://sheetwise.github.io/privacy.html explains this in more detail and how to contact the Publisher.

12. UPDATES AND CHANGES TO THIS AGREEMENT
The Publisher may provide updates but is not obliged to. This Agreement may be changed for later versions of the Software; a new version is shown by the installer of the Software version it comes with and applies once you agree to it there.

13. TERMINATION
This licence ends automatically if you breach this Agreement. On termination you must stop using the Software and delete all copies. Sections 3 to 11 and 14 to 21 survive termination.

14. EXPORT AND COMPLIANCE
You will comply with all export control and sanctions laws that apply to your use of the Software.

15. ASSIGNMENT
You may not assign or transfer this Agreement or any right under it without the Publisher's prior written consent; any attempt to do so is void. The Publisher may assign or transfer this Agreement, in whole or in part, without your consent, including as part of a merger, acquisition, reorganisation or sale of assets.

16. FEEDBACK
If you send the Publisher suggestions, ideas or other feedback about the Software, the Publisher may use them for any purpose, without any obligation or payment to you.

17. U.S. GOVERNMENT END USERS
The Software and its documentation are "commercial computer software" and "commercial computer software documentation" as those terms are used in FAR 12.212 and DFARS 227.7202. U.S. Government end users acquire them only with the rights set out in this Agreement.

18. PURCHASES AND REFUNDS
Licences are sold through the Publisher's reseller, which acts as the merchant of record and handles payment, taxes and refunds under its own terms. Any refund is given under the refund policy shown at the time of purchase. If a purchase is refunded or charged back, the licence and its licence key end. A licence key for an introductory year is free: nothing is charged for it, so there is nothing to refund.

19. NOTICES
Notices to the Publisher must be sent in writing using the contact details on its website (https://sheetwise.github.io/). The Publisher may give you notices by e-mail to the address you gave when you bought or signed up for the licence, in the Software or on its website; a notice sent by e-mail counts as received on the day it is sent.

20. DISPUTES: ARBITRATION AND CLASS-ACTION WAIVER
PLEASE READ THIS SECTION CAREFULLY. IT REQUIRES YOU AND THE PUBLISHER TO RESOLVE DISPUTES BY INDIVIDUAL ARBITRATION, AND IT WAIVES THE RIGHT TO A JURY TRIAL AND TO TAKE PART IN A CLASS ACTION.

(a) Informal resolution first. Before starting arbitration, a party must send the other a written description of the dispute (see section 19), and both will try in good faith to resolve it for 60 days.

(b) Arbitration. Any dispute arising out of or relating to this Agreement or the Software will be resolved by final and binding arbitration before a single arbitrator, administered by the American Arbitration Association under its Consumer Arbitration Rules (for individuals) or its Commercial Arbitration Rules (for companies and organisations). The Federal Arbitration Act governs this section. The arbitration takes place in Arizona or, at your choice, by video conference or on written documents only. Judgment on the award may be entered in any court that has jurisdiction.

(c) Exceptions. Either party may bring an individual claim in a small-claims court, and either party may ask a court for an injunction to stop the infringement or misuse of intellectual property.

(d) Class-action waiver. Claims may be brought only individually, not as a plaintiff or class member in any class, consolidated or representative proceeding, and the arbitrator may not combine the claims of more than one person. If this waiver is found unenforceable for a claim, that claim (and only that claim) is decided by a court and not in arbitration.

(e) Opt-out. You may opt out of this section by sending the Publisher written notice (see section 19) within 30 days after you first agree to this Agreement; this section then does not apply to you, and disputes go to the courts named in section 21.

(f) Where the law of the place you live does not allow this section to apply to you, it does not apply to you.

21. GENERAL
This Agreement is governed by the laws of the State of Arizona, USA, without regard to conflict-of-law rules. Subject to section 20, the state and federal courts located in Arizona have exclusive jurisdiction. If any provision is held unenforceable, it will be enforced to the maximum extent permitted and the rest remains in effect. Failure to enforce a provision is not a waiver. This Agreement is the entire agreement between you and the Publisher about the Software and replaces any earlier understanding, including earlier versions of the MathSheet licence agreement and terms of use.

By clicking "I Agree" when installing MathSheet you agree to this Agreement.