Case Study
JOII – Period Evaluation App
AI-powered menstrual health app for objective period blood loss measurement
Role
Senior Flutter Developer
Timeline
~1.5+ years
Industry
Women's Health / FemTech / Digital Health
Platforms
Android · iOS
Status
Shipped to App Store & Play Store
100+
Google Play downloads
App Store & Play
Dual-platform release
AI analysis
Blood loss & clot measurement
Situation & Challenge
Period blood loss is often under-reported because users rely on subjective estimates. JOII needed a mobile product that could capture images, run AI-powered analysis, and surface credible measurements users could bring to clinical conversations.
- •AI-powered image analysis for menstrual blood loss and clot size
- •Camera-based capture flows that work reliably on real devices
- •Objective measurement data for healthcare provider discussions
- •Cross-platform delivery on Android and iOS
- •Privacy-conscious handling of sensitive health data
What I Built & Why
I led mobile app development, API integration, and frontend operations — building the Flutter client around image capture, analysis results, and clear presentation of objective period evaluation data.
- •Flutter UI for image capture, analysis feedback, and period tracking flows
- •REST API integration with backend AI analysis services
- •Frontend operations support for releases and production stability
- •Secure authentication and session handling for health data
- •Cross-platform parity between Android and iOS builds
Decisions I Made
Architectural and product choices from production constraints — not hindsight slides.
Vision/AI image analysis, not a chatbot
Built period blood loss and clot size measurement through camera capture and AI image analysis — objective data for healthcare conversations, not a generic chat interface.
REST API for analysis results
Flutter client integrates with backend AI services via REST — keeping analysis logic server-side while the mobile app handles capture, feedback, and result presentation.
Privacy-conscious FemTech health data
Secure authentication and careful handling of sensitive menstrual health data — FemTech period evaluation, not mental health or general wellness chat.
Product Screenshots
Key flows from the shipped app — not mockups.
What I Owned
- ✓Mobile app development across Android and iOS
- ✓API integration with AI-powered image analysis services
- ✓Frontend operations for releases and production stability
- ✓Image capture flows and analysis result presentation
- ✓Secure handling of sensitive women's health data
Outcome
Delivered a cross-platform digital health application that uses AI-powered image analysis to help users measure menstrual blood loss and clot size and provide objective data for healthcare discussions.
- •Shipped to Google Play and the App Store as Joii Period Evaluation
- •100+ Google Play downloads with ongoing store presence
- •AI-powered image analysis integrated into mobile period evaluation flows
- •Objective measurement data designed for healthcare conversations
Tech Stack
Tools chosen for this project's constraints — not a generic checklist.
Related Reading
Guides connected to the patterns used in this project.
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