Proof of Grass: an on‑device verifier that ensures you go outside

说明与用途

Proof of Grass 是一个单文件网页应用，提供最佳户外时间建议，并使用浏览器端的视觉模型验证户外照片，所有数据保持本地，无需后端。

问题

People spend too much time on screens and need a lightweight way to decide when to go outside and prove they did.

结果

The app runs entirely in the browser, requires no backend or API keys, and keeps user photos local, enabling a privacy‑friendly, zero‑cost "touch grass" habit tracker.

工作流

• 1. User enters city or shares location.
• 2. App fetches weather data from Open‑Meteo and scores daylight hours using a heuristic.
• 3. App highlights the best "grass window" for the day.
• 4. User takes a photo outside and uploads it in the browser.
• 5. Transformers.js loads the CLIP ViT‑B/32 model (≈150 MB) and runs zero‑shot image classification.
• 6. The model compares probabilities for outdoor vs. indoor labels and verifies the photo is outdoors.
• 7. If verified, a Certificate of Grass is issued and the streak counter in localStorage is incremented.

证据

Proof of Grass is a one‑file web app that does two things: It tells you when to go outside…

来源

The first photo triggers a one‑time model download (~150 MB, then cached by the browser). After that it works offline.

来源

Open‑Meteo for the forecast and geocoding (free, no key, open‑source).

来源

Open-weight model: OpenAI's CLIP ViT‑B/32, in the ONNX conversion Xenova/clip‑vit‑base‑patch32 on the Hugging Face Hub.

来源