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Write to nexa28@proton.me for general support, subscription and billing issues, refund requests, privacy and data requests, policy questions or legal notices. Nexa28 is built and maintained by Perfectum Technologies.

For a billing or refund request, send it from the email address you used at checkout and include the plan and payment date so we can find it.

Looking for help with a calculation?

Every result can be expanded to show the exact formula and the numbers used, which usually explains an unexpected figure.