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Three rhythms that work, two that don't, and the small system that lets you actually run them.

Three cadences hold up across all the friendships we see actually surviving distance: the monthly check-in call (45 minutes, calendar-pinned, voice not text), the quarterly visit (one weekend in person, plane or train, even if short), and the same-day birthday call (not a text on the day, an actual phone call, even if it lands on voicemail). Two of three is enough for most friendships; one of three is below the line. If you're unsure where to start, how often you should actually reach out breaks down the right frequency per relationship.
The two patterns we see fail every time: always-on chat (a WhatsApp thread that's noise 90% of the time so the actual important update gets lost between memes), and scheduling something we'll figure out closer to the date (you won't; the date will pass; the next conversation will start with apologising for it).
These fail for the same reason: they push the activation energy onto your future self at exactly the moment when your future self is busy. The cadences that survive are the ones that pin a slot now and pre-decide what happens in it.
A cadence without scaffolding is just a wish. The scaffolding has three pieces: a stay-in-touch frequency per friend (weekly / monthly / quarterly), a last-contacted timestamp that updates whenever you talk, and a due queue that surfaces who's overdue. None of these need to be elaborate. They need to be in the same place so you can see them at once. The 5-2-1 rule is a minimal version of exactly this kind of system.
Friendship Tracker runs exactly this loop: each contact carries a frequency, every conversation log auto-updates the last-contacted timestamp, and the dashboard shows the overdue queue front and centre. The whole thing fits on one page. The point isn't the dashboard, though - the point is that the cadence becomes ambient instead of effortful.
Not every old friend should be on the monthly cadence forever. Some friendships fit a quarterly rhythm comfortably, some fit yearly. Lowering a cadence isn't downgrading the friendship; it's matching the cadence to where the friendship actually lives now. The mistake is leaving someone on a cadence that overshoots, missing it for months, and then feeling guilty enough that you avoid the next call. Pick the rhythm that's true and the calls happen. If the guilt is a sign that you've already drifted, why we drift apart from close friends explains the loop and how to break it.
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