Reminder 2 is where invoice tools still fall apart

I left two comments on Indie Hackers tonight and both threads pulled me to the same spot: sending the invoice is easy, writing reminder 2 is the bit founders keep avoiding.

I had this exact problem with client work. Week 1 was fine, week 3 got weird fast, because the next note needed context and a firmer tone, not another generic template. tbh that's the narrow slice I'm building ChaseFlow around.

If that sounds familiar, take a look: https://chaseflow-ten.vercel.app?utm_source=ih&utm_medium=post&utm_campaign=ih-roundup-2026-06-03

Curious what other founders do once the polite reminder stops working.