Seven small, fast, single-purpose tools. Everything runs in your browser — no uploads, no signup, no tracking beyond a minimal Cloudflare beacon.
Parse Unix, GitHub Actions, Vercel, AWS, Cloudflare cron expressions into plain English.
cron.platotools.comUnix timestamp converter, date math, batch convert, copy-as-code in 6 languages.
time.platotools.comBase64, URL, hex, HTML, JWT, ROT13. Auto-detect what you paste.
encode.platotools.comSide-by-side and inline diff. 100% browser-side — your code stays local.
diff.platotools.comFormat, validate, redact secrets. Built after the 2025 JSONFormatter breach.
json.platotools.comCount tokens across GPT-5, Claude 4.7, Gemini 2.5 + estimate monthly API spend.
tokens.platotools.comHEX ↔ RGB ↔ HSL ↔ HSV ↔ CMYK, WCAG contrast checker, color blindness simulation.
color.platotools.comMost online developer utilities upload your data to a server to "process" it. That data lives in their logs forever, or worse — leaks when they get breached (see the 2025 JSONFormatter incident). plato·tools is a deliberate alternative: every tool runs entirely in your browser, with verifiable behavior.
Each tool is fully self-contained on its own subdomain (e.g. json.platotools.com). This means the JSON tool's code never loads when you're using the cron tool. Each subdomain is a single ~12 KB HTML file that loads in milliseconds. SEO ranking is also per-subdomain, so each tool can rank on its own merits for its keyword.
Only Cloudflare Web Analytics — anonymous, cookieless, just page-view counts and country. No GA4, no tracking pixels, no fingerprinting. You can verify by opening DevTools → Network and pasting your input: you'll see zero outbound requests carrying your content.
Free, no signup, no ads currently shown. Once we hit ~500 visitors/day we plan to apply for Google AdSense to keep the lights on — but ads will be unobtrusive (no popups, no autoplay videos, no interstitials). If you'd rather not see any ads, use an ad-blocker; the tools work either way.
Once the page is loaded, yes — the tool runs entirely in your browser. The single HTML file caches normally. We don't ship a service worker for explicit offline mode yet, but it's on the list.
Indie operator (@Realcryptoplato on GitHub). The portfolio is built mostly via AI-assisted development — see the open-source repo for the build pipeline.
Open an issue on GitHub describing what tool, what you expected, and what happened. Most fixes ship within a few days.
Absolutely — please do. Each tool is a permanent URL. Examples:
• cron.platotools.com — Cron expression parser
• json.platotools.com — JSON formatter + validator
• tokens.platotools.com — LLM token counter