A fresh worked-examples set in your inbox every week.

It's a free automation. You generate and save a Worked Examples set, click "Email me a fresh set every week", pick a day and time, and confirm via magic link. From then on, AI emails you a freshly generated worked-examples set on the same topic / subject / grade band every week on that day and hour. The email arrives in your teacher inbox — no student email, no class list, no district approval needed. Unsubscribe any time via the one-click link at the bottom of every email.

No — Lesson Prep is teacher-only by design. The feature does not collect student email addresses or maintain class lists. We deliberately scoped it this way to avoid COPPA / FERPA / GDPR compliance scope and protect sender reputation. The email you receive is yours to forward, drop into Google Classroom, print, or adapt — the human (you) stays in the loop on what reaches students.

Any day of the week — Monday through Sunday. Time slots are curated to teaching-friendly hours: 6 AM, 7 AM, 8 AM, 9 AM, 12 PM, 3 PM, 5 PM, 7 PM, and 9 PM. Times are evaluated in your local timezone (DST-aware) so 7 AM means 7 AM where you live. We don't offer 24-hour free-form scheduling — the curated list keeps subject lines reading naturally (e.g. "Monday Morning lesson prep") and avoids the "I'll click randomly and regret it" tail.

A freshly AI-generated worked-examples set on the same topic / subject / grade band as your saved set. Each example includes a strategy callout, numbered steps with rationale, the final answer, and a check-yourself prompt. The email also has a "View this set on SpinWheelGo" button (link valid for 24 hours so you can grab the PDF if needed) and an unsubscribe link at the bottom. Two weeks of "Long division with two-digit divisors" will be two different sets of practice problems — the AI generates new content each week using your topic as steering input.

Your email (so we can mail you), a SHA-256 hash of your email (used to look you up on bounce events without exposing the email in indexes), the topic / subject / grade band from your saved set, your dayOfWeek + hourLocal + timezone, status (PENDING, ACTIVE, UNSUBSCRIBED, UNSUBSCRIBED_BOUNCED), confirmation-token-hash, unsubscribe-token-hash, and operational metrics (send + fail counts). Raw confirmation and unsubscribe tokens are never persisted — only their hashes. There is no second collection of student emails, no analytics dossier, no user profile.

ACTIVE subscriptions live as long as you want the weekly email — no TTL. PENDING subscriptions (you signed up but never clicked the magic link) auto-delete after 7 days via Firestore TTL. UNSUBSCRIBED and UNSUBSCRIBED_BOUNCED subscriptions auto-delete after 30 days (audit window). After auto-deletion the row is gone for good — re-subscribing is a fresh signup.

Click the unsubscribe link at the bottom of any weekly email. The link is unique to you (a magic-link token). Clicking flips your status to UNSUBSCRIBED, stops all future sends, and 302-redirects you to a confirmation page. A second click on the same link is idempotent — you just see "already unsubscribed", no error, no support ticket. If you want to come back later, sign up again from any saved Worked Examples set.

Resend automatically POSTs hard-bounce events to a Svix-signed webhook on the SpinWheelGo backend. The handler verifies the HMAC signature, locates your subscription via the email hash, and flips status to UNSUBSCRIBED_BOUNCED. You won't receive any "are you still there?" follow-up — bounce handling is silent. Soft bounces (temporary delivery failures) are ignored at the controller level — we let Resend handle the retry logic.

Yes, completely free. No signup, no credit card. The only data we store is what's needed to deliver and unsubscribe (see the data question above). Per-IP rate limits cap signups at 3 per hour to keep abuse off the Resend quota; in normal use you'll never hit them.

Yes — each saved Worked Examples set is its own potential subscription. You can subscribe a teacher inbox to multiple topics (e.g. one for 5th-grade fractions and another for 5th-grade Spanish). Each subscription has its own day / hour / status. Unsubscribing from one does not affect the others.