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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