Build
Community participation
How to get Reddit karma — lessons from my first 100 karma, community posting requirements, and what to check when a post is blocked.
ExploreNote tools
Printer Test Page
Free black-and-white and color printer test pages for checking text, tones and lines. Choose A4 or US Letter, print online or download a PDF. No signup.
Visit ↗Knitting Increase & Decrease Calculator
Space knitting increases or decreases evenly across one row or round. Works flat or in the round, then copy the instructions or save a PDF from the print dialog. No signup.
Visit ↗App Store Screenshot Size Checker
Drop a screenshot in the browser and check its pixel size against Apple’s App Store Connect specification. Nothing is uploaded, and the file is not resized.
Visit ↗IAP Review Screenshot Checker
Check the pixel size of an App Store Connect in-app purchase App Review Screenshot. Uses Apple’s published wording and dated Connect reports. Nothing is uploaded.
Visit ↗Google Search Favicon Checker
Check a favicon against Google Search Central’s current square, 8×8 minimum, larger-than-48 recommendation, and listed formats. The old multiple-of-48 rule is gone. Nothing is uploaded.
Visit ↗Etsy Banner Size
Check an Etsy shop banner against the 1200×300 minimum, the 1600×400 Help size, and the 3360×840 Handbook size. Mini banner sizes are separate. The same file is also read as a listing photo. Nothing is uploaded.
Visit ↗Discord Banner Size
Check a Discord image against four separate slots: account banner 680×240, per-server banner 600×240, server banner at least 960×540 at 16:9, and invite background exactly 1920×1080. The slots stay separate. Nothing is uploaded.
Visit ↗Instagram Post Size
Check a photo against Instagram Help: width 320 to 1080, and a ratio from 1.91:1 to 3:4. At width 1080, the named height span is 566 to 1440. 1080×1350 is inside that span, not the portrait edge. Nothing is uploaded.
Visit ↗Build tools
View Multiple Images
Compare up to 9 images side by side — synced zoom, pixel diff, A/B flash and overlay align. No signup.
Visit ↗SpiderHubs
Auto-monitors top posts across Xiaohongshu, Douyin, TikTok and more — bulk export of raw media, copy and comments, no account auth.
Visit ↗Netning
A personal link directory of everyday sites, AI tools, technical docs, startup and life resources, grouped by topic.
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