Free online developer tools (2026): the full CloudyBot /tools list

Start at the hub

Free tools hub — one page listing every utility with a short summary. It is the best URL to share when you mean “the whole free suite,” not a single gadget.

Client-side developer tools (no upload)

• Free JSON formatter & validator online — prettify, minify, or validate JSON from APIs and config files.
• Free JWT decoder online — read header and payload; signature is shown for reference only (not cryptographically verified).
• Free Base64 encoder & decoder (UTF-8) — text or small files up to 2 MB, proper Unicode handling.
• Free SHA-256 / SHA-512 hash generator online — includes HMAC-SHA and optional legacy SHA-1; Web Crypto in the browser.
• Free cron schedule helper — five-field cron → plain English, next runs in your timezone, optional compare-two.

Marketing & AI pricing helpers (still client-side)

• Free email subject line generator — tone, goal, audience chips; copy-ready lines for campaigns and cold outreach (edit before sending).
• Free AI token counter online — rough token estimate + list-price dollars per paste (heuristic, not tiktoken).
• Free AI cost calculator — ballpark monthly API spend vs CloudyBot’s published plan caps; educational estimates only.

HTML price checker (uses a server when you fetch a URL)

Free HTML price checker — paste HTML with a CSS selector, or ask CloudyBot to fetch a public URL (rate-limited per IP). History stays in your browser unless you export CSV. This is not a hosted 24/7 monitor; for JavaScript-rendered storefronts you eventually want a real browser session.

Why we publish “free” so aggressively

Searchers type free json formatter, jwt decoder online, free cron helper, and similar phrases. We would rather you get a real working tool with transparent limits than a landing page that hides work behind signup. When you need the same chores automated — schedules, memory, browser, notifications — that is what the CloudyBot product is for, with hard billing caps.

Related reading

• Genuinely free AI tools (2026) — broader directory mindset.
• AI cost calculator (2026) — methodology for the calculator tool.
• AI token counter (2026) — why heuristics exist.
• CloudyBot vs Zapier