Play with an interactive heatmap of SF crime (and other cities)
In plain words
SafeMap is an interactive heatmap tool that visualizes crime data for San Francisco and other cities. Users can explore geographical crime patterns to understand safety conditions across different neighborhoods. The tool lets people browse crime incidents mapped in real time, making neighborhood information accessible through a visual interface. It's designed for residents, visitors, or anyone interested in understanding crime distribution in their area.
written from the facts on this page · September 2026
Does the same job
all alternatives →
- GHGit Heat Map – a tool for visualising git repo activity for each file2023 · github.com · ▲173
- AWA website that heatmaps your city based on your housing preferences2025 · theretowhere.com · ▲321
For the past few months, I've been working on a website that answers two different questions: - Where in my city have the best travel times to all the things and people I care about? - Given a listing, how far is it from all the things and people I care about? Personally this was fueled by my own frustrations when I was apartment hunting in NYC. I was frustrating to have to juggle so many Google Maps tabs when I was evaluating a listing, and it was also annoying to not have full confidence that I was even searching in the right places. I wanted to be close to work, a Trader Joe's, and a…


More life & fun this month
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Hi HN, I built Eigendrum, a web tool that solves the 2D wave equation for arbitrary shapes so you can hear what they sound like as drums. How it works: * Solves -∇²u = λu using finite element analysis (Kφ = λMφ) on a triangle mesh. * Validated to <0.1% error against closed-form solutions for circles (Bessel zeros) and rectangles. * Sound model factors in strike location, Rayleigh damping, and mallet width. * Includes Kac drums I & II to demonstrate identical sound spectra from different geometries. * No frameworks, build steps, or dependencies. Repo and tests:…
Life & fun · 27d ago · baselashraf81.github.io
Launched alongside, August 2024
the whole month →
- IY
Life & fun · 2024 · ytch.xyz



- IA
Hey there HN! We’re Joe and Stopa, and today we’re open sourcing InstantDB, a client-side database that makes it easy to build real-time and collaborative apps like Notion and Figma. Building modern apps these days involves a lot of schleps. For a basic CRUD app you need to spin up servers, wire up endpoints, integrate auth, add permissions, and then marshal data from the backend to the frontend and back again. If you want to deliver a buttery smooth user experience, you’ll need to add optimistic updates and rollbacks. We do these steps over and over for every feature we build, which can…
Dev tools · 2024 · github.com