CalcRef

Terms

CalcRef is an educational calculus reference. It is not professional engineering, academic, or financial advice - verify every formula before relying on it for exams or professional work.

Everything runs in your browser. Your favourites, history and quiz results are stored locally under the key calcref:state; export and clear controls live in the app workspace. This browser keeps your most recent 500 quiz results. Older ones drop off as new ones arrive, and you can export them as JSON at any time.

Premium is billed through our payment provider and can be cancelled at any time. Web Premium is tied to the browser you bought it in; the access code shown after checkout restores it in another browser.

Refunds

Not happy with a purchase? Email [email protected] within 14 days of a first purchase, or within 7 days of a renewal, and we will refund it. Send the message from the email address you used at checkout, and include:

• the email address used at checkout (if you are writing from a different address)
• your access code, shown on the Premium page while you are signed in on the browser you purchased from
• roughly when you purchased, and which plan (weekly, yearly or lifetime)
• the last 4 digits of the card, if you have the receipt handy

That is everything needed to find the purchase and process the refund. This policy does not limit any statutory rights you may have.