Step into the shade.
Let's look at that spot.
Snap a photo of your skin. Chhaya describes what it sees, tells you when a spot deserves a doctor, and builds a hydration & protection plan around your work day.
Take two minutes in the shade.
Add a photo and press Check my skin.
Chhaya reads it with MedGemma and writes a plan around your work day.
Tap what is happening right now. Pure first-aid logic from NDMA / WHO guidance — no AI in the loop, because emergencies are not the place for sampling.
The spot that changes is the spot that matters. Re-photograph the same spots every few weeks and compare.
No saved checks yet.
Run a skin check and press Save to my record — comparing the same spot across weeks is how change gets caught early.
Why Chhaya exists
Hundreds of millions of people — drivers, delivery riders, construction workers, street vendors, farmers — spend their working lives in direct sun, and heat waves are making those hours harsher every year. They are the least likely to get a skin check and the most likely to need one. Chhaya is a small, free tool for exactly those hours: it looks at skin the way a careful friend would, explains what it sees in plain words, and turns heat-safety guidance into a plan that fits a real working day.
How it is built (honestly)
The model is the eyes, the guidelines are the medicine. Google's MedGemma-1.5-4B — a 4-billion-parameter medical vision-language model — reads the photo and returns a structured description (type, colour, borders, symmetry, texture, concern level). Every piece of medical guidance — hydration amounts, heat first-aid steps, when to see a doctor — is curated, deterministic content from NDMA India heat-action guidance, WHO heat-health advice, and Cancer Council ABCDE skin self-check criteria. The model never invents medical numbers.
Inspired by Sunny by Daniel Bourke — a MedGemma skin tracker for Australians — reimagined for outdoor workers facing heat waves. Built with Gradio on Hugging Face Spaces (ZeroGPU) for the Build Small Hackathon.
The sample-worker photos are open-license skin images from the ISIC archive and Google's SCIN dataset; the names and jobs are fictional.
What Chhaya is not
Not a medical device, not a diagnosis, not a substitute for a doctor. Photos are processed in memory and never stored on the server; your record lives only in your browser session. If something on your skin worries you, that worry alone is reason enough to see a clinician.
MedGemma-1.5-4B + Chhaya LoRA · Gradio · ZeroGPU runtime · guidance: NDMA · WHO · Cancer Council ABCDE