Useful tools and websites for developersbuilders
Browse a tightly edited directory of products, workflows, and references for makers. Run focused utilities when you need a fast answer.
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Browse all →LocalResizer
Resize and compress images locally in your browser with no uploads.
Screen Size Checker
Check screen resolution, viewport size, DPR, and device information online.
TheSiteMath
Free construction calculators for contractors, builders, and DIY projects.
AI Kitchen Preview
Preview realistic AI kitchen design ideas from a photo before remodeling.
MyFatCalc
Free body fat calculator using several common estimation methods.
CardAction
· ProductivityThe Lightning-Fast Business Card Scanner
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GEO & LLM Site Analyzer
· SEOCheck if your website is optimized for AI search engines like ChatGPT and Perplexity (checks llms.txt, robots.txt, and schema).
Complete Meta Check
· SEORun one complete check for metadata, canonical tags, robots.txt, and sitemap signals.
URL Parameter Generator
· MarketingBuild clean tracked links with UTM parameters for campaigns, newsletters, ads, and social posts.
JSON Formatter & Validator
· DeveloperClean, format, and validate messy JSON data instantly. All processing is done locally in your browser for privacy.
JSON Schema Generator
· DeveloperConvert JSON data into a valid JSON Schema instantly. Perfect for defining structured outputs for AI agents, LLMs, and API documentation.
Universal File Converter
· DeveloperConvert images, data, and documents between formats locally in your browser. Supports WebP, PNG, JPG, JSON, CSV, and more with 100% privacy.