Blog · Product
Articles about product
Every castly article about product: practical guides with examples.
November 13, 2026 · ProductWhen to ask for notification permission without getting blockedA "Block" in the browser dialog is close to permanent. When to ask for notification permission, what to say first, and how to help users who already…November 13, 2026 · ProductPush notifications or email: when to use each channelPush for what is urgent and short, email for what people must keep. A decision table by use case and two patterns to combine both channels without du…November 13, 2026 · ProductTransactional push notifications: orders, bookings and alertsWhich events deserve a push, how to tie them to each user, how to write them, and how to set TTL, urgency and idempotency so they arrive on time and…November 13, 2026 · ProductHow many push notifications to send before people opt outThere is no safe weekly number. Split notifications by type, cap the promotional ones low and measure opt-outs per send to tune the cap with real dat…
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