Open Source Initiative

Open Clinical Decision Support for Immunizations

OpenCdsi is building a simple immunization decision support system for use by off-grid clinics and itinerant health workers. Its premier product is VaxEngine, a vaccine forecasting tool. VaxEngine is used in the mobile app which includes a basic immunization registry and vaccine guidance from the Pink Book.

Core Artifacts

Key outputs from the OpenCdsi project

VaxEngine

VaxEngine is a CDSi evaluation and forecast engine. It was developed against the Logic Spec for AICP Recommendations v4.6. It has been tested against the 1064 conformance tests in the Healthy Childhood and Adult v4.46 corpus.

The Pink Book

The antigen chapters of The Epidemiology and Prevention of Vaccine-Preventable Diseases - 14th Edition are packaged as a .NET library.

API

The RPC/REST interface exposes:

— Evaluation & forecast
— Pink Book antigen chapters
— Supporting data

Mobile App

The mobile app forecasts future vaccines for a patient given their immunization history. It runs on Android and Windows 11.

Android 16 APK Win11 x64 MSI Win11 ARM64 MSI OpenCdsi Cert

Latest News

From Software Engineer to Product Designer October 19, 2026
Part 3 of 3. Part 1 covered the thirteen years of failing, and Part 2 covered the day the AI found what I’d missed. This one is about everything that happened after the engine worked.

The Day My AI Read the Spec Better Than I Did October 12, 2026
Part 2 of 3. Part 1 covered thirteen years of failing at the same spec, and the day I handed it to an AI agent as a lark.

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Contact Us

info@opencdsi.org