Privacy & Support

It remembers. You do the math.

Inkerval is a handwritten math practice app for iPad, a product of Khanna's LLC. You solve problems in your own handwriting; Inkerval schedules what to practice next so that what you learn stays learned.

Privacy policy

The short version: Inkerval works fully without an account, collects the minimum needed to sync your work when you choose to sign in, shows no ads, uses no third-party trackers, and never sells data.

Without an account: everything you do stays on your iPad. Nothing is sent anywhere.

With an account (optional, via Sign in with Apple) we store, on your behalf:

• Your Apple account email address (or Apple's private relay address if you choose Hide My Email), used only to identify your account.
• Your practice history: which problems you attempted, your own right/shaky/wrong verdicts, timestamps, and topic identifiers.
• Images of the handwriting you produce while solving, so your notebook can follow you across devices.

Feedback: if you use the in-app feedback form, we store the message you write, the app version, and (if signed in) your account identifier so we can follow up on bugs.

Where it lives: data is stored with our hosting provider Supabase on servers in Frankfurt, Germany (EU). It is protected by per-account access rules: your data is readable and writable only by your authenticated account.

What we don't do: no advertising, no analytics SDKs, no tracking across apps or websites, no selling or sharing of personal data, no AI training on your data.

Deleting your data: in the app: Home → … menu → Delete account. This immediately and permanently removes your account, practice history, and handwriting images from our servers. Work saved locally on your iPad stays yours. You can also email us (below) to request deletion.

Support

Questions, bugs, or feedback: email daksh@khannasllc.com or use the feedback form inside the app (Home → … menu → Send feedback). You'll usually hear back within a couple of days.

Inkerval is a product of Khanna's LLC. Last updated 19 August 2026.