Get Callback connected
The easy way is to just ask Claude. If you got here from a prompt, Claude can walk you through connecting Callback right in your chat. Once it's connected, Callback tells Claude what to do next — so you get the right nudge at the right time. You don't have to read the rest of this page.
Rather do it yourself? Here's everything, start to finish — the same steps, nothing hidden.
Connect the connector
https://api.callback.cards/mcp
Open Connectors in claude.ai
In claude.ai, go to Settings → Connectors.
Add the custom connector
Choose Add custom connector and paste https://api.callback.cards/mcp.
Sign in or create your account
Authorize when prompted. Callback is invite-only right now, so you'll need to be on the allowlist — email hello@callback.cards if you're not yet.
Enable it for your chats
Turn the connector on, and you're set. Back in your conversation, Claude can now save what you learn and coach you from here.
What happens next
Learn, then keep it
Once you've worked through something worth remembering, ask Claude to save it as flashcards (“quiz me on this”).
Review it — that's what makes it stick
Claude hands you a link to review your new cards in the browser or the app. That first review is the moment it moves from “made sense” to “remembered”.
Get reminded
Install the Android app for a daily nudge when cards come due — each one timed to land just before you'd forget.
Claude walks you through all of this once you're connected — you don't need to memorize it.