MatraBloom

Postpartum Recovery App

A postpartum recovery app and website that turns birth type, weeks since birth and a two-question morning check-in into a daily movement plan. Flutter Android app, multilingual Next.js web app, and one shared Firebase backend.

Visit Website →Google Play →

The Challenge

Most pregnancy apps stop at birth. In the twelve weeks after it, the pelvic floor, the abdominal wall and, after a caesarean, an incision all recover on different timelines, and general fitness apps either ignore that or fall back on "listen to your body". MatraBloom needed to give specific, conservative guidance about which movements are open in which week after which kind of birth, adapt each day's session to how much energy a new mother actually has, and stay clearly a wellness companion rather than a medical device.

Technical Challenges

✓Birth-type gating — exercise categories open on different weeks after a vaginal birth and a caesarean (pelvic floor at week two vs four, strength at three vs six, core at eight vs twelve), so the plan moves on thresholds, not on streaks.
✓Energy-sized sessions — a two-question morning check-in (mood and energy) resizes that day's session; an exhausted answer cuts it to about 70% of its length instead of cancelling it.
✓One source of truth across platforms — the website and the Android app share one exercise library and one set of week gates, so a guide on the web can name the exact week a movement opens.
✓One entitlement, three sources — Android purchases go through RevenueCat, web checkout through Paddle, and referrals grant Premium too; webhooks mirror all three into one Firestore subscription record that both platforms read.
✓Localisation at two depths — the app ships in ten languages; the public website publishes six with hreflang, and the four extra languages exist only behind sign-in so every page keeps one URL per language.
✓Responsible health content — every recovery guide lists its sources (ACOG, NHS, Cleveland Clinic) and says plainly when something needs a call to a midwife or doctor rather than a read.

Architecture & Evolution

The Flutter app uses a feature-first structure — onboarding, check-in, workout, timeline, journal, learn, premium and referral — with Riverpod for state, GoRouter for navigation, and separate data, domain and presentation layers. Firebase provides authentication, Firestore, Analytics, Crashlytics and push notifications.

The core loop is Today → Recommendation → Workout → Feedback → Adaptation. The morning check-in feeds the recommendation, a guided workout player runs the session, and rep targets step up after the fourth and tenth completed sessions.

The Next.js website is more than a marketing site. Its public side carries the recovery guides, a week-by-week recovery hub and the blog; behind sign-in it runs the same product as the app (today's plan, workouts, check-ins, journal), with Paddle checkout and a RevenueCat webhook keeping subscriptions in sync with Android.

The Solution

A Flutter Android app and a Next.js web app on one Firebase backend. The plan is built from birth type and weeks since birth, then sized each morning by the mother's own check-in. Premium is sold through RevenueCat on Android and Paddle on the web, and both write to the same Firestore subscription record, so a purchase on one platform unlocks the other. The public website ranks for postpartum recovery questions with sourced, week-specific guides and sends readers into the app.

Tech Stack

FlutterDartRiverpodGoRouterFirebaseRevenueCatNext.jsTypeScriptTailwind CSSClerkPaddleVercel

Key Features

✓Recovery plan built from birth type and weeks since birth

✓Exercise categories gated by week, separately for vaginal and caesarean births

✓Two-question morning check-in for mood and energy

✓Daily session resized to the energy logged that morning

✓Guided workout player with exercise videos

✓12-week recovery timeline with milestones

✓Mood tracking plotted across weeks

✓Private recovery journal with prompts

✓Learning library of sourced postpartum guides

✓Free tier and Premium subscription on Android and the web

✓Cross-platform entitlements via RevenueCat and Paddle webhooks

✓App in ten languages, public website in six with hreflang

Screenshots

MatraBloom homepage hero for the postpartum recovery app

MatraBloom morning check-in that resizes the day's session

MatraBloom recovery timeline and milestones

MatraBloom exercise thresholds for vaginal and caesarean births

MatraBloom week-by-week postpartum recovery guide

MatraBloom Android app guided workout player

MatraBloom Android app recovery timeline

Deployment

Web — Next.js deployed on Vercel at matrabloom.online

Android — Google Play Store

iOS — waitlist open

Subscription webhooks from RevenueCat and Paddle write to Firestore, so entitlement changes reach both platforms even when the app is closed.

Lessons Learned

→Specific thresholds beat vague encouragement — naming the week a movement opens after a specific kind of birth is more useful than "listen to your body", and it forces the content and the app to agree.
→Sharing one exercise library between the app and the website kept the published guides and the in-app plan from drifting apart.
→Designing for exhaustion matters — the default response to a low-energy morning is a shorter session, not a skipped one.
→When a product sells on more than one platform, entitlements need one server-side record that every payment source writes to; client-side mirroring alone misses renewals and refunds that happen while the app is closed.