App notifications have a 3-10% engagement rate. Emails average around 20% open rates. Text messages? 98% open rate, with 90% read within 3 minutes.
These aren't marketing stats. They're human behaviour. We treat text messages differently because they come from people we know. A text sits in the same thread as your mum, your partner, your builder. It feels personal because the channel is personal.
Why app notifications fail
The average smartphone user receives 80+ notifications per day. Most get swiped away without being read. Your brain learns to ignore them — they become visual noise. Even "important" notifications from task apps get lost in the stream.
Why SMS cuts through
Text messages are different because they're scarce. You get a handful a day, not dozens. Each one demands attention because the channel still carries weight. A text from an unknown number makes you curious. A text from a saved contact makes you read it.
This is why again uses SMS instead of an app. When you get a text saying "SEND INVOICES — due today. Reply DONE or SNOOZE" — you read it. You deal with it. You move on. The entire interaction takes 5 seconds.
It's not clever tech. It's human nature.
SMS reminders work because they exploit the one channel people haven't learned to ignore. Your task doesn't compete with 80 other notifications. It sits alone in your messages, waiting for you to reply.