Built a co-parenting app in 2 months
Built a co-parenting financial records app — I spent 20 years at Oracle building enterprise systems so the data integrity and security side came naturally, but Flutter was new territory.
Stack is Next.js + Flutter iOS sharing a Supabase backend. The core idea: instead of tracking expenses as isolated transactions (which is how most competitors do it), it maintains a true running ledger — both parents add entries from either side, they accumulate, and you settle the net. Separate ledgers for shared expenses and alimony/child support. Everything is immutable after the fact — no edits, no deletes, timestamped approvals and disputes. The goal is something that holds up if it ever ends up in front of a mediator or attorney. Each transaction has an embedded message thread for discussions. App also has calendar for custody & event scheduling, and message hub that surfaces all the messages from across the transactions.
Built it as a solo project — web app is live, iOS just submitted to the App Store. Supabase RLS doing the heavy lifting on multi-tenant data isolation, pg_cron handling recurring transactions, Edge Functions for email. PostHog for analytics — which has already been entertaining since I watched a competitor manually audit the whole app yesterday.
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Happy to answer questions about the stack or the build if anyone's curious.
Live demo: app.fairledger.app/demo
Landing page: fairledger.app