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Free Tools for Developers
Handy, no-nonsense utilities you can use right now: no account, no limits. Built by the team behind ContinuumNexus monitoring.
SLA & Uptime Calculator
Convert 99.9%, 99.99% or any SLA into allowed downtime per day, month and year, or work backwards from a budget.
Open toolHTTP Status Codes
Searchable reference of every HTTP status code with plain-English explanations, class by class.
Open toolSSL Certificate Checker
Check any domain's TLS certificate: expiration date, days remaining, issuer and thumbprint, expired certificates included.
Open toolFree API Health Check
Test any endpoint and see its status code, response time and availability in seconds.
Open toolJWT Decoder
Decode a JSON Web Token's header, payload and claims with human-readable expiry, never stored or logged.
Open toolCron Expression Generator
Build a cron schedule, read it in plain English and preview the next run times.
Open toolUnix Timestamp Converter
Turn epoch seconds or milliseconds into ISO 8601 and readable UTC dates, and back.
Open toolIP Subnet Calculator
Turn an IP and CIDR into network, broadcast, host range, usable hosts and binary, instantly.
Open toolJSON Formatter & Validator
Format, beautify, minify, and validate JSON payloads instantly with syntax checks.
Open toolJSONPath Tester
Evaluate and extract data from JSON payloads using JSONPath expressions online instantly.
Open toolBase64 Encoder / Decoder
Encode text to Base64 or decode it back: UTF-8 safe, with a URL-safe (base64url) option.
Open toolURL Encoder / Decoder
Percent-encode text for URLs and query strings, or decode %-sequences back to readable text.
Open tool