Last updated 9 November 2026.
In short
- Calculations run in your browser. What you type reaches us only if you save it to an account or send it to us, and on calculators with suggestions, where the values on the page are sent to our servers to work them out.
- We count page views as daily totals, with no cookie and no identifier.
- No advertising, and no third-party analytics or tracking. We do not sell your data.
On your device
Your inputs are kept in the page address, so a link reproduces the calculation. Anyone you send a link to sees those values.
Your browser keeps your theme and display settings, a copy of pages for offline use, your sign-in, the work you save here, and your board and fab profiles. It also keeps the inputs and headline answer of your last 50 calculations, how often and for how long you use each calculator, and your favourites, for the Recent and Favourites lists.
To clear the recent list, use “Clear recent” in Your work. Turning off “Remember what I open on this device” clears it and stops keeping it. Clearing your browser data removes everything.
None of this is sent to us, except the work you save, which joins your account when you sign in, and, while you are signed in, your theme and the project you last saved to.
Page counts
When you leave a page, a daily total for that page goes up by one. It records the page name, whether you were signed in, and a rough reading time. There is no record of your visit, and the page address, which carries your numbers, is not sent. If your browser sends Global Privacy Control or Do Not Track, nothing is counted.
Your account
An account holds your email address, a username, your password (which we do not see), an optional name and company, your saved projects and calculations, your ratings, and your display preferences (theme, last project used). Your saved work is visible only to you. If you sign in with Google or GitHub, that provider shares your email address and, if available, your name.
Product events
When the site shows you a locked feature or a limit you have reached, or you press an upgrade or checkout button, we record the event, which feature, limit or plan it concerned, where it happened and when, with your account id if you are signed in. These events do not include what you type into a calculator. We use them to improve the product.
Offers
If we offer you free months of a paid plan, we record the offer and whether you used or dismissed it, so you are not shown it twice. Offers are chosen from your plan status and saved work, or by an administrator for a single account, not from what you browse. A code that does not work is noted for security and deleted within 2 months.
Account email, such as confirmations, password resets and receipts, is part of the service.
Email about the paid plan and new calculators is sent only if you ask for it, and only to an address that has been confirmed. You can ask at sign-up, with a box that starts unticked, or in Profile & settings. You can stop it there at any time, or with the link in each such message: one press of a button, with no sign-in needed.
We keep a record of which messages we sent you, and whether each was delivered. There is no open tracking and no click tracking. If you unsubscribe, mark a message as spam, or your address does not exist, we keep that fact so that no further email is sent to it.
Paid plans
When you buy a plan, our payment provider takes the payment as merchant of record, in its own checkout and under its own privacy policy. We do not see or store your full card number.
We keep your subscription record (plan, billing period, seats, status, renewal date and the provider's reference numbers) and the provider's messages about it, which can include payment and billing details such as your card's brand and last four digits, your name and your billing address. Only administrators can see them, and only to manage your plan or answer a question about a payment.
Reports, packs and messages
A signed report or design review pack is a document you choose to share. Anyone with its code can see the details printed on it, and you can withdraw it.
A problem report keeps your message, the page and calculator it concerns and, if you leave the box ticked, the values you entered. If you are signed in, it is linked to your account so we can reply. Otherwise it carries no name or email address. A consulting request keeps what you enter, including your email address. We use problem reports to reply and to improve the calculators, and consulting requests to reply.
A rating keeps the stars you give a calculator, any note you add and, if you leave its box ticked, the values you entered. We use ratings to improve the calculators.
Suggestions on a calculator are worked out on our servers from the values on the page. An answer may be held for up to a day. It is not linked to you. If you are signed in, we count your requests to apply a daily limit.
Who helps us
Trusted service providers host the site, store accounts and saved work, and deliver email. Our payment provider handles payments. They act on our instructions and only for these purposes. Opening any page shares your IP address and browser details with our hosting providers, who keep standard technical logs to run the service. Your data may be processed outside your country, with the safeguards the law requires. You can ask us for the names of these providers.
How long we keep it
| What | Kept for |
|---|---|
| Your account and saved work | Until you delete them |
| A deleted calculation | In Recently deleted, until you empty the bin or close the account |
| A withdrawn report or pack | Kept as withdrawn, so a copy can still be checked. Ask us to erase it |
| Page counts | 13 months |
| Product events | 13 months |
| Record of email sent to you, and delivery reports | While your account exists, and 2 years after the last message |
| Unsubscribes, spam reports and bounces | Indefinitely, so no further email is sent |
| An offer you did not use | 2 years |
| An offer you claimed | While your account exists |
| Administrative audit log | 2 years |
| Subscription record | Until your account is deleted |
| The payment provider's messages | As long as needed to answer questions about a payment |
| Your ratings | Until you change or remove them, or delete your account |
| The count of your requests for suggestions | Starts again each day. Removed with your account |
| Problem reports and consulting requests | Until you ask us to delete them. A report sent while signed in is removed with your account |
| Technical logs kept by our providers | Their standard periods |
Deleting your account removes your data, except for a few records, each kept only as the table says: a record of the deletion; your unsubscribe or bounce status, so no further email is sent; your email preferences and the record of email sent to your address; and the payment provider's messages, so a disputed charge can still be traced.
Your rights
- See and download: Profile & settings gives you one file with your account, saved work, reports and packs, ratings and problem reports, email history and offers. For product events and the payment provider's messages, which are kept separately, ask us.
- Correct: edit your details in the same place. To change the email address you sign in with, write to us.
- Delete: item by item, or the whole account.
- Restrict or object: write to us.
- Complain: write to us, or contact your data protection authority.
Legal basis
Your account, saved work and any paid plan are provided under our contract with you. Email about the paid plan and new calculators rests on consent, which you can withdraw at any time. Everything else rests on our legitimate interest in running, securing and improving the service, making offers and answering your messages. Nothing is stored on your device for a purpose you did not ask for, so there is no cookie banner.
Children and changes
RobustPCB is a professional tool, not intended for anyone under 16. When this page changes, the date at the top changes.
Contact
RobustPCB is responsible for your data. Write to [email protected] with any question or request.