Push, in-app and SMS: sequencing mobile messages so people don't mute you

Push notification opt-in is the only marketing permission that a user can revoke in two taps and will never grant again. That makes mobile messaging a budgeting exercise in something scarcer than money. The teams that do it well decide, per message, whether it is worth spending permission on.

What each surface is for

• Push: interruption. Reserve it for things that are time-sensitive and specific to that user — an order shipped, a booking tomorrow, a price drop on something they saved.
• In-app: context. It costs nothing in permission because the user is already there. Everything promotional belongs here first.
• SMS: reach. It works when the app is not installed or the notification was ignored, and it costs real money per send, which is a healthy constraint.
• Email: depth. Anything that needs more than a sentence.

A sequence that respects the hierarchy

Start in-app: if the user opens the app in the next 24 hours, they see the message with no permission spent. If they do not open, escalate to push — but only if the message still matters and is still personal. Escalate to SMS only for messages with a real deadline or real money attached. Most campaigns should stop at step one.

Frequency rules worth writing down

• A hard cap on promotional pushes per user per week, enforced in the platform rather than in a document.
• Quiet hours in the user's local time, applied to every channel.
• Priority ordering, so a transactional message never gets suppressed by a promotional cap.
• A cooling period after any user dismisses several notifications without opening — dismissals are the leading indicator of an opt-out.

Ask for permission at the right moment

The single biggest improvement available to most apps is not the messages, it is when the opt-in prompt appears. Asking on first launch, before the user knows what the app does, produces low opt-in and high later revocation. Asking at the moment the value is obvious — right after a first order, when tracking updates become useful — routinely doubles the accept rate.

Treat the permission as the scarce resource and the metrics follow: fewer messages, higher open rates, and an opted-in base that is still there next year.