Terms of Service

Last updated September 19, 2026.

These terms cover your use of the marginstudy Mac app and marginstudy.app. marginstudy is developed and operated by Alric Siu (“marginstudy,” “we,” or “us”). Questions? Email [email protected].

Using marginstudy

marginstudy is a PDF study app for Mac. It lets you write notes alongside passages, organize ideas in scratchpads, and return to your saved place. These terms govern the license we grant you to use the app. Please read them before purchasing or using marginstudy.

The current direct-download version requires macOS 14 Sonoma or later and an Apple silicon Mac (M1 or newer). Check the requirements for the version you download. Some features depend on the text and permissions available in your PDF.

Your license and trial

The direct-download app includes a 14-day trial. A purchase grants you a license to use the purchased version on up to two Macs that you own or control. Deactivate a Mac before transferring its activation to another. The license is for your use; you may not share or resell your license key.

marginstudy is a one-time purchase, not a subscription. The price, currency, applicable taxes, and any discount are shown at checkout. A purchase does not promise every future major upgrade or compatibility with every future operating system.

Reading and writing do not require a marginstudy account. License activation and periodic verification require an internet connection. An activated license supports up to 30 days of offline use after a successful check. Trial and license data handling is explained in our Privacy Policy.

Orders and payments

Lemon Squeezy is the merchant of record and authorized reseller for purchases through this website. It handles checkout, payment processing, applicable taxes, receipts, and refunds. Lemon Squeezy’s Buyer Terms apply to your purchase alongside these terms for using marginstudy. Contact us for help with the app itself.

Refunds

We offer refunds for technical problems that prevent marginstudy from working as described and cannot reasonably be resolved, as well as refunds required by law. See our Refund Policy for eligibility and how to request help. Any additional rights provided by the seller of your order also apply.

Your books and notes

You retain your rights to the content you create. marginstudy does not acquire ownership of your PDFs, notes, or scratchpads. You are responsible for having permission to use the materials you open in the app.

marginstudy references PDFs at their original locations and stores your notes, scratchpads, bookmarks, and reading positions locally on your Mac. We do not have access to this locally stored content or keep a server backup of it.

You are responsible for backing up your PDFs and marginstudy workspace. If local files are deleted or corrupted, we cannot restore your notes from our systems. Recovery depends on a usable backup or local recovery copy that you control. Moving or deleting an original PDF can also affect the app’s access to it.

Responsible use and ownership

Use marginstudy lawfully. Do not distribute unauthorized copies, bypass license controls, misuse another person’s license, or interfere with the website or licensing services. These restrictions do not limit activities permitted by applicable law or a relevant open-source license.

marginstudy’s software, branding, and original website content belong to their respective owners. Third-party software included with the app remains covered by its own license notices. Books linked from our Resources page belong to their authors or publishers and are not included in a marginstudy purchase.

Support, changes, and your rights

For technical support, email [email protected]. We may update the app and website to improve them or address problems. Features and system requirements can change between versions.

We do not promise uninterrupted or error-free operation or a particular learning outcome. Nothing in these terms excludes a warranty, remedy, or liability that cannot lawfully be excluded, including your mandatory consumer rights.

We may suspend or revoke a license for a material breach of these terms or after a refund. Where appropriate, we will provide notice and an opportunity to resolve the breach. This does not remove rights you have under applicable law.

We may revise these terms and will show the updated date on this page. Changes will not retroactively remove rights attached to a completed purchase. We will provide any notice or obtain any agreement required by law.