Tools to protect children online.

A client-side neural network that classifies images as safe or explicit directly in the browser — no uploads, no server. Ideal for filtering user-generated content or building parental-control extensions that keep data on-device.

$ npm install nsfwjs

A lightweight, fully offline classifier and detector for nudity in images and video. It can both flag and automatically censor explicit regions, making it a strong building block for moderation pipelines and content-safety filters.

$ pip install nudenet

Open-sourced by Bumble, this model detects lewd and unsolicited explicit images so platforms can warn or shield recipients — a key defense against image-based sexual harassment and grooming of minors.

$ git clone github.com/bumble-tech/private-detector

A network-wide DNS sinkhole that blocks domains for every device on your network at once. Paired with adult-content blocklists, it becomes a powerful, tamper-resistant family filter that runs on hardware as small as a Raspberry Pi.

$ curl -sSL https://install.pi-hole.net | bash

A self-hosted DNS server with built-in, one-click parental controls and "safe search" enforcement across Google, YouTube, and Bing. Blocks adult websites network-wide with a friendly dashboard and per-device rules.

$ curl -sSL https://raw.githubusercontent.com/AdguardTeam/AdGuardHome/master/scripts/install.sh | sh

A fast, lightweight DNS proxy and ad/content blocker for local networks. Highly configurable blocklists and scheduling let you tighten filtering during kids' hours and run it in a tiny container alongside your other home services.

$ docker run -p 53:53/udp spx01/blocky

A powerful self-hosted DNS server with per-client filtering, blocklists, and safe-search enforcement, plus encrypted DNS (DoH, DoT, DoQ). Set stricter rules for kids' devices and block adult content network-wide — well beyond a basic resolver, with a clean web console.

$ docker run technitium/dns-server

A content-aware web filtering proxy that inspects pages in real time — not just domains — blocking adult and unsafe material by category, keywords, and URL lists. The actively maintained successor to DansGuardian, suitable for a single home or an entire school network.

$ docker run fredbcode/e2guardian

Meta's open-source perceptual hashing (PDQ for images, TMK+PDQF for video) and matching toolkit. Generate robust signatures and match content against shared hash lists of known CSAM and other harmful media — the same hashing approach used by NCMEC and major platforms.

$ pip install threatexchange

A widely trusted, resource-efficient content blocker for Firefox and Chromium. Paired with adult-content and malware filter lists, it gives families a transparent, audited way to block unwanted sites and trackers right in the browser.

# add from your browser's extension store

A no-root firewall for Android that controls internet access per app and applies host-based blocklists. A practical way to lock down a child's phone or tablet — block specific apps and filter adult and malicious domains device-wide.

# install from F-Droid or Google Play

A flexible DNS proxy with encrypted DNS (DNSCrypt, DoH), built-in blocklists, and cloaking that can force safe-search on major search engines. Enforce family-safe, tamper-resistant DNS that ISPs and apps can't quietly bypass.

$ brew install dnscrypt-proxy

A set of trained models that score text for toxicity, threats, insults, and sexually explicit content across multiple languages. A building block for chat-safety filters and moderation pipelines that flag abusive or predatory messages aimed at minors.

$ pip install detoxify

A maintained TensorFlow/Keras implementation of Yahoo's well-known Open-NSFW model that scores how likely an image or video frame is to be explicit. A simple, fully offline classifier for moderation pipelines and content-safety filters.

$ pip install opennsfw2