Privacy and terms

Short version: we don't receive your family's information. Students' names and work stay in your browser on your device. The only thing that leaves the device is your license key, which goes to Gumroad, our store, to check your purchase, and only after you agree.

Who we are

Safe Chemistry Labs is made and sold by Abhishek Sinha. Questions about privacy, your license or a refund: reply to your Gumroad receipt email.

What the app keeps on your device

The app saves the following in your browser's storage on the device you use. None of it is sent to us, and we can't see it.

Students' first names and grade levels, as you enter them.
Lab work: hypotheses, observations, data tables, answers, conclusions and scores, and when each lab was started and finished.
Time spent in each lab on each day (for the hours log), and any grades or comments a parent adds.
The parent PIN, stored only as a one-way scrambled code (a hash), never as the PIN itself. After the PIN is entered or changed, the browser tab also notes the time, so the parent area locks again after 30 minutes. That note is deleted when the tab closes.
Display settings (theme, text size and motion), and which level the library shows (middle school, high school or all).
If you activate a license: the key, its plan, how many devices the plan allows, whether it was a test purchase, when it was activated and last checked, and how many checks in a row Gumroad didn't recognize it.
When you agreed that the key may be sent to Gumroad, so the box stays ticked on this device.
If a weekly check finds that the key no longer works (for example after a refund), the app deletes the key and its details by itself. It keeps a short note saying why, shown on the Unlock all labs page until a key is activated again.
In the website version only: a copy of the app's own files, so it works offline.

Backups. Parent → Settings → Download backup saves the students, their lab work, hours, grades and comments, the display settings and the PIN's scrambled code in a file on your device, usually in your Downloads folder. It doesn't include the license key. The app never sends a backup anywhere.

What leaves your device, and why

What: Your license key and our product ID
Sent to: Gumroad (Gumroad's privacy policy)
When: When you press Activate, after you agree, and about once a week after that, when the app is opened
Why: To check that the purchase is valid, so the labs unlock or stay unlocked

When you activate, the app first asks Gumroad to check the key. If the key is good and its plan has room, a second request adds this device to the key's count of devices. The weekly check only looks; it never adds a device. Like any internet request, each one also lets Gumroad see your device's IP address.

From Gumroad's reply, the app keeps only the plan, the number of devices it allows and whether it was a test purchase. It also reads how many devices already use the key, to stay within the plan's limit, but it doesn't store that number. It doesn't keep your email address or any payment details.

Nothing else is sent: no analytics, no advertising, no cookies, no tracking and no third-party scripts. The fonts and icons are part of the app. Buy buttons and help links simply open Gumroad's website.

When you buy

Gumroad runs the checkout and handles payment as the merchant of record; its privacy policy covers the details you give there. Gumroad shares the purchase details sellers receive, such as your email address, with us so we can help with your license, a device reset or a refund. We use them only for that, and we never sell them.

Children's privacy

The labs are made for students in grades 6–12, used with a parent or teacher. We don't collect personal information from children: what students type stays on the device. Buying and license keys are for parents and teachers, and sit behind the parent PIN when one is set.

Limited use

The use of information handled by Safe Chemistry Labs complies with the Chrome Web Store User Data Policy, including the Limited Use requirements. Data is used only to provide the labs and check your license. It is not sold, not used for advertising, not used to determine creditworthiness, and not transferred for any purpose unrelated to the app.

Deleting your data

Parent → Settings → Erase all data deletes every student, lab report, hour logged, grade and comment on this device, and the PIN and display settings. It keeps the license key, so paid labs stay unlocked.
Remove from this device, on the license page (Parent → Settings → License details), deletes the license key and its details, and your agreement to send it to Gumroad, so activating again asks you again. Students and their work stay.
Removing the Chrome extension deletes everything it saved, including the license. In the website version, clearing the site's data in your browser settings does the same.

Each way is permanent. Backup files you downloaded stay where you saved them: delete them like any other file. To have your purchase record removed from our Gumroad account, contact us as above.

Terms of sale

Seller. Sold by Abhishek Sinha through Gumroad, which processes the payment as merchant of record. Google is not the seller.
Free. Two labs, Signs of a Chemical Reaction and Measuring pH, work fully at no cost. The other labs can be previewed.
Plans. One-time payments in US dollars, plus sales tax or VAT where it applies. Family, $29: one household, up to 5 devices. Co-op & Classroom, $99: one co-op class, tutoring group or school group, up to 30 devices. Both include every lab and future updates to these labs.
Devices. Each browser profile where you activate your key counts as one device. Removing the key from a device doesn't free the slot; contact us and we'll reset it.
Refunds. If it isn't right for you, contact us within 30 days of buying for a full refund. A refunded or disputed purchase stops unlocking the paid labs.
Fair use. Please don't share your key outside your plan or copy the app for others. Your students' lab reports belong to you; print and share them freely.

About the science

The labs are simulations. They follow real chemistry closely, but they simplify some things so the important ideas stand out, and they are not a substitute for supervised laboratory instruction. The safety notes describe what a supervised school lab would need: please don't try these experiments at home. Several of the chemicals are toxic, corrosive or flammable. The app is provided as is, without warranties beyond those required by law.

Changes

If what the app does with data ever changes, we'll update this page, change the date below, and tell you in the app before the change takes effect.