There's a notification many health apps send around day four or five....
It says something like: you haven't logged in 3 days. Get back on track.
I want to think about who actually receives that message...in most cases, it's someone managing something that doesn't fit neatly into a routine.
Someone for whom day four of going quiet probably means something happened, not that they lost motivation.
And the message they receive tells them they're behind, that there is a track to get back on and that the product has been keeping score.
I've spent a lot of time looking at re-engagement drop-off in consumer health apps, because aside from organizational behavior change, this is the other area of work I do.
Using notifications to treat the day four cliff is common, and while I won't get into the issues with notifications from wrong timing, wrong frequency, and fatigue.. of course those things matter, the thing is, there is a more fundamental issue, which is the assumption the message was written from.
You haven't logged in 3 days. Get back on track, was written from the assumption that the user forgot, or needed a push, or required a reminder that they have a commitment to fulfil, however, many times none of those things are true.. instead, life just happened.
The message that works from that assumption should look differently, something like: It's been a few days, you can pick up whenever you're ready.
The mechanism is worth being precise about, because it is not really a copywriting change, people don't just evaluate whether to return, they evaluate what returning means about them.
A judgmental message turns absence into something identity-relevant... it implies the user failed, and that coming back is an admission of it, however, a non-judgmental message makes absence normal and return frictionless.
That is the real design variable, not the tone of the notification, but the psychological cost of resuming.
This only works if the product experience backs it up... because if the user returns and finds a broken streak, a progress or a backlog of missed tasks, the copy is telling them the door is open while the product is showing them what they lost.. so you solved the message and left the penalty intact.
The re-engagement copy and the re-entry experience have to say the same thing.
Designing re-engagement copy for a health app means starting from a different assumption about why people disappear, its not forgetting or laziness, instead something happened, and your job is to make returning feel like easy, normal and low-cost.
Most apps design re-engagement for the version of their user who just needs a nudge, but the users they're actually losing needed the door left open.