B2B · HSA and FSA payments

How Flex grows

1 tactic from 1 interview.

About Flex

What it is: HSA/FSA payments provider integrated with RevenueCat

As described in the interviews, not independently verified.

Flex's tactic

Natal · B2C · pregnancy and postpartum fitness app

Let people pay with their health savings account (HSA) at checkout

Tens of thousands of dollars in two weeks, unpromoted

Added HSA payment at web checkout via Flex (RevenueCat integration). Users select a qualifying category (e.g. diastasis recti, pelvic floor exercises); checkout is longer. Free trial offered only on the annual plan for HSA. Launched quietly without announcement. Trigger: users had long been submitting receipts to insurance for reimbursement and asking in DMs.

Workedpayments-checkoutpricing

Sub Club by RevenueCat · 2026-05-27

Topics

Web-to-app funnels and web checkout1 Pricing a subscription app1

Interviews

How Removing the Free Trial Grew Monthly Subs 2000% – Nancy Anderson, Natal · Sub Club by RevenueCat · 2026-05-27