PureSight

1. KEYWORD ANALYSIS Every image's filename, URL path, alt text, surrounding text, and parent link text is analyzed against curated lists of female, male, and safe-context keywords. This catches obvious cases instantly, before any AI model even runs — keeping performance fast even on image-heavy pages.

2. AI GENDER DETECTION PureSight uses face-api.js with the TinyFaceDetector model (the smallest and fastest available) to detect faces and classify gender with configurable confidence thresholds. When a female face is detected above the confidence threshold, the image is filtered. This catches images where keyword signals are absent — stock photos, social media profile pictures, editorial images.

3. SKIN EXPOSURE ANALYSIS A custom pixel-level skin detection algorithm (HSV + YCbCr color model) calculates the ratio of skin-toned pixels to total image pixels. Images exceeding the configurable threshold are filtered even when there's no face present at all. This is the signal that catches swimwear, lingerie, and body-focused photography that other filters completely miss.

When all three signals are considered together, PureSight achieves dramatically fewer false positives than skin-only detectors (like TAG Image Filter) and dramatically better coverage than keyword-only or domain-only filters (like FoxFilter or BlockSite).

─────────────────────────────────────── HOW FILTERING WORKS ───────────────────────────────────────

All images on a page are hidden by default via injected CSS before the page finishes loading. This eliminates the "flash of unfiltered content" problem that plagues other extensions — you never see a filtered image, even for a split second.

Each image is then analyzed through the pipeline:

→ Is this image too small to matter? (configurable minimum size) → mark safe → Is this page on the NSFW blocklist? → block the entire page → Is this page on your whitelist? → mark all images safe → Keyword analysis: strong safe signal? → mark safe. Strong female signal with no male signal? → filter → AI gender detection + skin analysis run in parallel → Final decision: filter if female face detected, or female keywords plus elevated skin ratio

Filtered images are either:

• Blurred (CSS filter, fast, works everywhere)
• Grey body overlay (MediaPipe body segmentation — draws a grey silhouette over detected body regions while leaving the background fully visible)

The grey overlay mode is particularly effective because it obscures the body precisely without making the whole image disappear — the page layout stays intact.

─────────────────────────────────────── WHAT PURESIGHT BLOCKS ───────────────────────────────────────

PureSight protects you from content across a much wider spectrum than other filters:

EXPLICIT CONTENT

• 80,000+ known adult domains (updated weekly)

IMMODEST BUT NOT EXPLICIT

• Fashion product photos
• AI-generated suggestive imagery
• Social media posts with sensitive photos
• Reddit subreddits

VIDEO CONTENT

• YouTube videos filtered by transcript
• Video elements on web pages analyzed in real-time*

*Note on video filtering: On DRM-protected platforms like YouTube and Netflix, body segmentation isn't available due to content protection restrictions. PureSight applies blur overlay for these and uses transcript/metadata analysis. On standard HTML5 video elements across the rest of the web, full body segmentation is available.

─────────────────────────────────────── HOW PURESIGHT COMPARES ───────────────────────────────────────

BlockSite and Cold Turkey are focus/productivity tools that let you manually block specific websites. They have no visual content analysis at all — if an explicit image appears on a site that isn't on your blocked list, it passes through completely unfiltered. They are built for distraction blocking, not content safety.

FoxFilter uses keyword matching against page text and URL patterns. It has no visual analysis component, so it cannot detect images that aren't accompanied by explicit text. A fashion site product page for a bikini has no explicit words — FoxFilter won't touch it. PureSight's skin analysis and gender detection catch it anyway.

TAG Image Filter performs pure skin-color pixel detection using HSV/YCbCr color models — similar to one of PureSight's three signals. The problem with relying on skin color alone: food (certain warm-toned foods), sunsets, wood grain, sand, and sports action photos all trigger false positives. And skin detection without gender context means male athletes, fathers playing with children, and medical imagery all get flagged. PureSight's keyword and gender signals dramatically reduce false positives while catching more true positives.

uBlock Origin is a network-level adblocker. It can be configured with cosmetic rules to hide specific CSS selectors, but has no semantic image analysis. It's a powerful tool for ad blocking, not content filtering.

PureSight is the only Chrome extension that combines all three signals — keywords, AI face/gender detection, and skin analysis — in a single pipeline, with configurable thresholds, tamper protection, and a free-tier that's genuinely useful.

─────────────────────────────────────── FREE TIER — INCLUDED AT NO COST ───────────────────────────────────────

The free tier of PureSight is a real content filter, not a nag screen. It includes:

• Keyword-based image filtering across all pages
• NSFW domain blocking — 80,000+ domains from StevenBlack's aggregated blocklist and a curated AI image generation site blocklist, updated weekly
• Custom domain blocklist — add any domain you want blocked
• Custom site whitelist — allow specific sites to bypass filtering
• YouTube transcript filtering — analyzes video transcripts and captions to block videos that discuss explicit topics even when the thumbnail looks clean
• Feedback system — right-click any filtered image to report false positives

The free tier uses keyword-only image analysis.

─────────────────────────────────────── PRO TIER — $3.99/MONTH OR $29/YEAR 7-DAY FREE TRIAL — NO CHARGE UNTIL TRIAL ENDS ───────────────────────────────────────

The Pro tier adds the full AI pipeline:

• AI gender detection — face-api.js TinyFaceDetector + AgeGenderNet running entirely in your browser. Detects faces and classifies gender with configurable confidence threshold. No data leaves your device.

• Skin exposure analysis — configurable skin ratio threshold. Images with more than the threshold of skin-toned pixels are filtered, even with no face and no keywords present.

• Body segmentation grey overlay —Identifies the person region in an image and draws a grey silhouette precisely over the body, leaving the background fully visible. This is much more surgical than blurring the whole image and keeps the page layout intact.

• Real-time video filtering — HTML5 video elements are analyzed in real-time using the same pipeline. Videos are overlaid with a blur during playback.

• Custom sensitivity thresholds — adjust the skin exposure threshold and minimum image size from the popup. Configurable gender confidence threshold.

• Tamper protection — see below.

─────────────────────────────────────── TAMPER PROTECTION ───────────────────────────────────────

PureSight includes a unique tamper protection system designed for users who want protection that's genuinely hard to undo in a moment of temptation.

When Challenge Lock is enabled, any attempt to loosen a protection setting — turning off the image filter, turning off the site blocker, raising the skin sensitivity threshold, disabling gender detection — requires typing a full challenge phrase before the change takes effect, without a single error.

That's 250+ characters. You can customize the phrase to something more meaningful to you.

The challenge phrase system works because it introduces friction. Turning off a filter takes less than a second normally — click, done. With the challenge, you have to deliberately type out a full paragraph. That pause is often enough.

Additionally, you can enable "Block Extensions Page" to prevent navigating to chrome://extensions — the page where extensions can be disabled entirely. This is an additional layer of protection against bypassing the filter by disabling the extension itself.

The challenge lock does NOT prevent you from tightening protection — you can always turn features on, raise thresholds to filter more, or add domains to your blocklist without any challenge.

─────────────────────────────────────── PRIVACY — EVERYTHING STAYS ON YOUR DEVICE ───────────────────────────────────────

PureSight is designed privacy-first from the ground up:

• All image analysis — skin detection, face detection, gender classification, body segmentation — runs entirely in your browser using local models. No image data is ever transmitted anywhere.

• No browsing history is collected. PureSight does not know what sites you visit, what images it processes, or what it filters.

• Subscription management (for Pro users) is handled by ExtensionPay, which uses Stripe. The only data collected for this purpose is your email address. This is used exclusively for subscription management — not marketing, not analytics.

• PureSight has no analytics, no telemetry, no usage tracking, and no crash reporting.

─────────────────────────────────────── SUPPORT & FEEDBACK ───────────────────────────────────────

Found an image that shouldn't be filtered (false positive)? Right-click it and select "Report: should NOT have been filtered."

Found an image that should have been filtered but wasn't (false negative)? Right-click it and select "Report: SHOULD have been filtered."

These reports help us improve the keyword lists and detection thresholds in future updates.

For support, feature requests, or bug reports, please use the Chrome Web Store support tab.