04 / Development
Kidney Buddy grew from a simple MIT App Inventor prototype to an incubator-backed cross-platform product for real users.
Visual Evolution
Progress can be shown over the course of five major versions: three prototype iterations before the incubator, which was then followed by two product releases built for users.
Proof of concept → Feature expansion → Refined prototype → Android product → Cross-platform product · Published on Google Play and the Apple App Store
What changed technically?
| Capability | Version 1 | Version 2 | Version 3 | Version 4 | Version 5 |
|---|---|---|---|---|---|
| Product stage | Initial prototype | Feature-expanded prototype | Refined prototype | Market-ready Android release · Published on Google Play | Cross-platform product · Published on Google Play and the Apple App Store |
| Primary storage | Local | Local | Local | Local | Local-first |
| Cloud sync | — | — | — | — | Selective / optional |
| Backup & restore | — | — | — | — | Supported |
| Subscriptions | — | — | — | — | Supported |
| AI usage limits | — | — | — | Free-user limits | Cloud-enforced quotas |
| Nutrition analysis source | AI | AI | AI | AI | USDA FoodData Central first · AI for complex cases |
| Key expansion | Basic meal tracking | Meal planning · reports · clinic/lab search | Risk assessment · tips · personalized settings | Food/label scan · meal totals · serving-size adjustment | Local-first storage · FoodData Central-first analysis · optional backup/sync · subscriptions · iOS · sodium tracking |
| Nutrients tracked | Protein · Potassium | Protein · Potassium | Protein · Potassium · Phosphorus | Protein · Potassium · Phosphorus | Protein · Potassium · Phosphorus · Sodium |
| Development tools | MIT App Inventor | MIT App Inventor | MIT App Inventor | MIT App Inventor | TypeScript · AI-assisted development |
| Platform | Prototype | Prototype | Prototype | Android | Android + iOS |
Version labels show the development sequence; dates and values visible inside screenshots may reflect test or capture data.
Development Evolution
Five versions where built upon the problems of the the previous.
Actual Version 1 screens from the original MIT App Inventor proof of concept.
Version 1
Initial Prototype · MIT App Inventor
We started with the smallest useful version of the idea: a local-only prototype that let users log meals and monitor protein and potassium. Version 1 was simply about proving the concept was possible.
Version 2 added meal planning, longer-term reporting, and clinic/lab search while remaining a local-data prototype.
Version 2
Feature-Expanded Prototype · MIT App Inventor
Version 2 broadened the original concept. We added meal planning, nutrition reports, and clinic/lab search while keeping the underlying data local to the device. This was the first version to receive recognition from competitions.
First external validation
Version 3 became the most complete pre-incubator prototype, with broader CKD support and a more polished interface.
Version 3
Refined Competition Prototype · MIT App Inventor
Version 3 added phosphorus tracking alongside protein and potassium and expanded the experience with risk assessment, educational tips, personalized settings, and more cohesive navigation. It was still local-data software, but it became the version that earned broader national and international recognition.
National & international recognition
Additional recognition: Conrad Challenge — 2025–26 Conrad Finalist & 2024–25 Conrad Innovator Award · Global Youth Entrepreneurship Challenge 2025 — U.S. 2nd Place · Paradigm Challenge 2025 — Finalist · Diamond Challenge 2025 — Advanced to Pitching Round · National STEM Festival 2024 — Finalist
Version 4 turned the strongest pre-incubator prototype into a marketable Android product while keeping data stored locally and expanding practical nutrition support through food scanning, meal summaries, and meal planning.
Version 4
Marketable Android Release · MIT App Inventor
After the incubator, Version 4 became Kidney Buddy’s first marketable Android release while still storing data locally on the device. It expanded the product experience with food and nutrition-facts scanning, per-meal and daily nutrient summaries, adjustable serving sizes, and usage limits for AI-powered features for free users.
Version 5
TypeScript · USDA FoodData Central + AI · Android + iOS
As Kidney Buddy’s functionality and cross-platform goals expanded, our original development approach became increasingly limiting. Alan and I co-led the transition toward TypeScript and AI-assisted programming. Version 5 adopted a local-first architecture: high-frequency data is saved on the phone first for faster performance, offline usability, and reduced network traffic, while only necessary data is synchronized to Supabase for services such as authentication, subscription and AI-usage enforcement, and optional backup and restore. This version also added Android + iOS support and sodium tracking for the first time. Version 5 is now published on both Google Play and the Apple App Store.
Version 5 also changed how we used AI. Rather than relying on AI for every nutritional analysis, we integrated USDA FoodData Central as the first source for common foods and reserved AI for cases requiring more complex analysis. This improved performance while reducing unnecessary AI usage and associated costs, reflecting a more deliberate product decision: only using AI where it adds value.
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