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Terms of Use

Last updated: October 8, 2026

These Terms of Use (“Terms”) are a binding agreement between you and Chockstone Labs LLC, an Ohio limited liability company doing business under the trade name PencilCAD (“Chockstone Labs”, “PencilCAD”, “we”, “us” or “our”). They govern your use of the PencilCAD app for iPad and iPhone and this website (together, the “App”). By downloading, installing or using the App, you agree to these Terms and to our Privacy Policy. If you don’t agree, don’t use the App.

Please read section 16 carefully. It contains a binding arbitration agreement and a waiver of class actions and jury trials that affect how disputes between you and Chockstone Labs are resolved. You may opt out of arbitration within 30 days, as section 16 explains.

1. Who we are

PencilCAD is a trade name of Chockstone Labs LLC, an Ohio limited liability company, which operates the app. Our mailing address is 46 Shopping Plaza, PMB 5052, Chagrin Falls, OH 44022, United States, and you can reach us at support@chockstonelabs.com.

2. Eligibility

You must be at least 13 years old to use the App, or at least 16 if you live in the European Economic Area or the United Kingdom. If you are under 18, or under the age of majority where you live, you may use the App only with the involvement and permission of a parent or legal guardian who agrees to these Terms. You may not use the App if the laws of the United States or any other applicable jurisdiction bar you from doing so.

3. License and restrictions

Subject to these Terms, we grant you a personal, limited, non-exclusive, non-transferable, non-sublicensable, revocable license to download and use the App for your own personal or professional work on Apple devices that you own or control, as permitted by the Usage Rules in the Apple Media Services Terms and Conditions. The App is licensed, not sold. We reserve all rights not expressly granted.

You agree not to, and not to help anyone else to:

4. Sketches, not engineering drawings

PencilCAD is a sketching tool. Its grids, snapping, lines, shapes, constraints, measurements, dimensions, imports and exports are drawing aids. The App can work out lengths, angles and scales from what you draw, but those numbers are only as accurate as the drawing, the scale you set and any picture you trace over, and nothing in the App checks that a drawing is correct, complete or fit for any purpose.

You are responsible for checking every size, angle and quantity before you cut, print, machine, order, build or rely on anything you sketched, including any DXF, SVG, PDF or image file you export to another program or machine. Nothing in the App is engineering, architectural, construction, safety or professional advice, and a sketch made in the App is not a substitute for proper drawings, CAD models, measurements or inspections. We are not responsible for materials, parts, prints, time or projects that don’t turn out as you intended.

5. Price and purchases

The App may be offered free or for a price, and may offer optional in-app purchases. Any purchase is processed by Apple through the App Store and is subject to Apple’s terms. Apple handles payment, and we never see your payment details. Prices are shown before you buy and may change; a price change doesn’t affect a purchase you’ve already made. Refunds are handled by Apple under its policies, and except where the law requires otherwise, we don’t issue refunds directly.

6. Your drawings

You own the drawings, pages and other material you create in the App (“Your Content”). Your Content is stored on your devices and, if you use iCloud sync, in your own iCloud account, which Apple provides. We don’t host it, can’t read it, and claim no ownership of it. Because we don’t hold a copy, you are responsible for keeping one, for example by exporting pages you want to keep. To the fullest extent permitted by law, we are not responsible for any loss of Your Content, whether caused by deleting the App, tearing out a page, a device, backup or iCloud sync problem, an update, or anything else. If you import a picture, PDF or drawing, you’re responsible for having the right to use it.

If you choose to send us any of Your Content, for example a page attached to a support request, you grant Chockstone Labs a non-exclusive, worldwide, royalty-free license to use, copy and analyze it to answer your request, fix problems and improve the App.

7. Feedback

The App doesn’t host public posts, comments or profiles. If you send us ideas, suggestions, feature requests, bug reports or other feedback (“Feedback”), you grant Chockstone Labs a perpetual, irrevocable, worldwide, royalty-free, fully paid, transferable and sublicensable license to use, modify and commercialize it for any purpose, without compensation or attribution. We aren’t obligated to use or respond to Feedback, and Feedback is not confidential.

If you give us permission to feature a drawing, review or other material, for example on this website or in the App Store listing, you grant us a non-exclusive, worldwide, royalty-free license to reproduce, display, crop, resize and distribute it, with any credit you ask for, until you ask us in writing to stop using it in new materials. You confirm that you own or have permission to share what you send us and that it doesn’t infringe anyone’s rights or break any law.

8. Our intellectual property and data

The App and website, including their software, design, user interface, text, graphics, animations, help content and all updates, together with the PencilCAD name, logo and other brand features, are owned by Chockstone Labs LLC or its licensors and are protected by copyright, trademark and other laws. Nothing in these Terms transfers any of those rights to you.

Chockstone Labs also owns the de-identified analytics and aggregated statistics generated by operating the App, such as feature-usage counts that aren’t linked to you, and may use them for any lawful purpose consistent with our Privacy Policy. This doesn’t include Your Content, which stays yours as section 6 describes. Apple, iPad, iPhone, iCloud and Apple Pencil are trademarks of Apple Inc.; PencilCAD is not affiliated with or endorsed by Apple.

We respect intellectual property rights. If you believe material in the App or on this website infringes your copyright, send a written notice to our designated copyright agent, registered with the U.S. Copyright Office:

Copyright Agent, Chockstone Labs LLC
46 Shopping Plaza, PMB 5052
Chagrin Falls, OH 44022, United States
Phone: (513) 570-4573
Email: support@chockstonelabs.com (subject line “DMCA”)

Your notice must include, as required by 17 U.S.C. § 512(c)(3): your physical or electronic signature; identification of the copyrighted work you claim is infringed; identification of the material you claim is infringing and where it is, with enough detail for us to find it; your name, address, telephone number and email address; a statement that you have a good-faith belief that the use is not authorized by the copyright owner, its agent or the law; and a statement, under penalty of perjury, that the information in your notice is accurate and that you are the copyright owner or authorized to act for the owner.

If material you provided was removed and you believe that was a mistake, you may send our agent a counter-notice that meets 17 U.S.C. § 512(g)(3). We may remove material, end the access of repeat infringers where appropriate, and forward notices to the person who provided the material. Under 17 U.S.C. § 512(f), anyone who knowingly misrepresents that material is infringing, or was removed by mistake, may be liable for damages.

10. Artificial intelligence

PencilCAD’s drawing tools run on your device using ordinary geometry, and handwritten numbers are read on your device by Apple’s built-in text recognition. The App doesn’t send your drawings to generative AI or machine-learning services, and we don’t use Your Content to train AI models. Parts of our software, website and help content may be made with the help of AI-assisted tools, and we remain responsible for them under these Terms. If we ever add a feature that sends your content to an AI service, we’ll describe it in these Terms and the Privacy Policy before it does so.

11. Third-party services

The App works with services we don’t control, including the Apple App Store, iCloud and the analytics provider described in the Privacy Policy, and this website links to others. Your use of those services is governed by their own terms and privacy policies. We aren’t responsible for third-party services, content or availability, and a link is not an endorsement.

12. Apple App Store terms

If you download the App from the Apple App Store, you and we acknowledge and agree that:

13. Disclaimer of warranties

To the fullest extent permitted by law, the App is provided “as is” and “as available”, with all faults and without warranties of any kind. Chockstone Labs disclaims all warranties, whether express, implied or statutory, including the implied warranties of merchantability, fitness for a particular purpose, title, quiet enjoyment, accuracy and non-infringement, and any warranties arising from a course of dealing or usage of trade. We do not warrant that the App, or any grid, snap, line, shape, constraint, measurement or dimension it draws, or any file it imports or exports, will be accurate, reliable, complete, uninterrupted, secure or error-free, that defects will be corrected, or that your content will be preserved.

Some jurisdictions don’t allow the exclusion of certain warranties, so some of these exclusions may not apply to you. In that case, any warranty is limited to the shortest period and narrowest scope the law allows.

14. Limitation of liability

To the fullest extent permitted by law, in no event will Chockstone Labs LLC or its members, managers, employees, contractors, agents, licensors or suppliers be liable for any indirect, incidental, special, consequential, exemplary or punitive damages, or for any loss of profits, revenue, business, goodwill or data, or the cost of materials, parts, prints, rework or substitute products, arising out of or relating to the App or these Terms, whether in contract, tort (including negligence), product liability or any other theory, even if we have been advised of the possibility of those damages.

To the fullest extent permitted by law, our total liability for all claims arising out of or relating to the App or these Terms will not exceed the greater of (a) the amount you paid for the App and in-app purchases in the 12 months before the event giving rise to the claim, or (b) US$50.

These limits are an essential part of the bargain between you and us and apply even if a limited remedy fails of its essential purpose. They don’t limit liability that can’t be limited under applicable law, such as liability for fraud, or for death or personal injury caused by negligence where the law doesn’t allow it to be limited.

15. Indemnification

To the fullest extent permitted by law, you agree to defend, indemnify and hold harmless Chockstone Labs LLC and its members, managers, employees, contractors and agents from and against any claims, liabilities, damages, losses, judgments, settlements, costs and expenses, including reasonable attorneys’ fees, arising out of or relating to (a) your use or misuse of the App, (b) your violation of these Terms, (c) your violation of any law or of the rights of a third party, or (d) any Feedback or other material you send us. We may take control of the defense of any such claim at your expense, and you agree to cooperate with us. You may not settle any such claim without our prior written consent.

16. Dispute resolution, binding arbitration and class action waiver

Informal resolution first. Before starting an arbitration or court case, you and we each agree to try to resolve the dispute informally. The party raising the dispute must send a written notice describing it, the relief requested and contact details, to support@chockstonelabs.com or to our mailing address in section 21 if you are sending it, or to the email address we have for you if we are. If the dispute isn’t resolved within 60 days after the notice is received, either party may begin arbitration. Any limitation period is paused while this process is under way.

Agreement to arbitrate. Except as stated below, you and Chockstone Labs agree that any dispute, claim or controversy arising out of or relating to these Terms, the App or your relationship with us, whether based in contract, tort, statute or any other theory, and including disputes about the scope, enforceability or arbitrability of this section, will be resolved by final and binding individual arbitration rather than in court. This agreement is governed by the Federal Arbitration Act, 9 U.S.C. § 1 and following.

Exceptions. Either party may bring an individual claim in small claims court if it qualifies and stays there. Either party may also ask a court for an injunction or other equitable relief to stop the infringement or misuse of intellectual property rights, including the restrictions in section 3.

Rules and procedure. The arbitration will be administered by the American Arbitration Association (“AAA”) under its Consumer Arbitration Rules then in effect, as modified by this section, and decided by a single arbitrator. The rules are available at adr.org. Hearings will take place by video or telephone unless the arbitrator decides an in-person hearing is necessary, in which case it will take place in the county where you live or another location we agree on. For claims of US$10,000 or less, the arbitration will be decided on written submissions unless the arbitrator decides a hearing is needed. Fees are allocated under the AAA rules, and we will pay the filing, administrative and arbitrator fees those rules assign to the business. The arbitrator may award the same individual relief a court could award, but only to the individual party seeking relief and only to the extent needed to resolve that party’s individual claim.

Class action and jury trial waiver. You and Chockstone Labs agree that each may bring claims against the other only in an individual capacity, and not as a plaintiff or class member in any purported class, collective, consolidated, private attorney general or representative proceeding. The arbitrator may not consolidate more than one person’s claims or preside over any form of class or representative proceeding. You and Chockstone Labs each waive the right to a jury trial.

Mass filings. If 25 or more similar arbitration demands are filed against us by or with the help of the same or coordinated counsel, the AAA will administer them in batches of up to 25 demands, with one arbitrator for each batch, and only one batch will proceed at a time. Limitation periods for demands in later batches are paused until their batch begins. A court may enforce this paragraph.

30-day right to opt out. You may opt out of this agreement to arbitrate by emailing support@chockstonelabs.com, or by writing to Chockstone Labs LLC, Attn: Arbitration Opt-Out, 46 Shopping Plaza, PMB 5052, Chagrin Falls, OH 44022, within 30 days after you first accept these Terms, with the subject line “Arbitration opt-out”, your name, the email address you want us to use, and a clear statement that you opt out of arbitration. Opting out doesn’t affect any other part of these Terms.

Time limit. To the extent permitted by law, any claim arising out of or relating to these Terms or the App must be brought within one year after it arises, or it is permanently barred.

Changes and severability. If we make a material change to this section, you may reject it by emailing us within 30 days after it is posted, and the version you last accepted will continue to apply. If the class action waiver is found unenforceable as to a particular claim or request for relief, that claim or request will be severed and decided in court under section 17 after the individual arbitration ends, and will not proceed in arbitration. If any other part of this section is found unenforceable, the rest of it remains in effect.

Consumers outside the United States. If you live in the European Economic Area, the United Kingdom, Switzerland or another country whose laws don’t permit this agreement to arbitrate, this section doesn’t apply to you, and you may bring claims in the courts where you live.

17. Governing law and venue

These Terms and any dispute arising out of or relating to them or the App are governed by the laws of the State of Ohio, United States, without regard to its conflict-of-law rules, and, as to section 16, by the Federal Arbitration Act. The United Nations Convention on Contracts for the International Sale of Goods doesn’t apply. Subject to section 16, any claim that is not arbitrated must be brought exclusively in the state or federal courts located in the State of Ohio, and you and we consent to the personal jurisdiction of those courts. If you are a consumer who lives outside the United States, this section doesn’t deprive you of the protection of mandatory laws of the country where you live or of your right to bring claims there.

18. Termination

You may stop using the App at any time by deleting it from your devices. We may suspend or terminate your license to use the App, or any part of it, at any time and without notice or liability if you violate these Terms, if we reasonably believe it is necessary to prevent harm or comply with the law, or if we discontinue the App. When your license ends, you must stop using the App and delete it. Your Content on your devices and in your iCloud account remains yours. Except where the law requires otherwise or Apple grants a refund under its policies, no refund is due when your license ends because of your violation. Sections 3 (restrictions), 4, and 6 through 20, and any other terms that by their nature should survive, survive termination.

19. Changes to the App and these Terms

We may add, change, suspend or remove features of the App, and may stop offering or supporting the App or any version of it, at any time. We aren’t obligated to provide updates, but any updates we provide are governed by these Terms.

We may update these Terms from time to time. The “Last updated” date at the top shows the current version, and for material changes we’ll give reasonable notice, for example on this website or in the App. Changes take effect when posted, except that changes to section 16 follow the process described there. Continuing to use the App after changes take effect means you accept the updated Terms.

20. General

Entire agreement. These Terms, the Privacy Policy and, where it applies, Apple’s Licensed Application End User License Agreement are the entire agreement between you and us about the App and replace any prior agreements on that subject.

Severability. If any provision is held invalid or unenforceable, it will be enforced to the maximum extent permissible and the remaining provisions stay in full effect, subject to section 16.

No waiver. Our failure to enforce any provision is not a waiver of our right to enforce it later.

Assignment. You may not assign or transfer these Terms without our prior written consent. We may assign these Terms, in whole or in part, including in connection with a merger, acquisition, sale of assets or reorganization, and they will bind our successors.

Force majeure. We aren’t liable for any delay or failure caused by events beyond our reasonable control, including outages of Apple or other third-party services, internet failures, natural disasters, labor disputes or government action.

Relationship. Nothing in these Terms creates a partnership, joint venture, employment or agency relationship. Except for Apple as described in section 12, there are no third-party beneficiaries of these Terms.

Export. You agree to comply with all applicable export control and economic sanctions laws in your use of the App.

Electronic communications. Notices, agreements and other communications we provide electronically, including by email or by posting on this website or in the App, satisfy any legal requirement that they be in writing.

Language and headings. The English version of these Terms controls. Headings are for convenience only.

21. Contact

Chockstone Labs LLC, doing business as PencilCAD
46 Shopping Plaza, PMB 5052
Chagrin Falls, OH 44022, United States
Questions about these Terms or the App: support@chockstonelabs.com
Copyright (DMCA) notices: our designated agent, listed in section 9