Cron Expression Builder & Validator

🔥 7-DAY LAUNCH SPRINT (May 1–8, 2026): First 100 runs free for new users. Parse and validate cron expressions with human-readable explanations. Calculate next run times, generate expressions from natural language, and access common presets. Supports standard and extended cron syntax.

Validate cron expressions and compute next run times via a simple HTTP API.

Cron Expression Parser and Next Run Times

mangudai/cron-expression-parser

Parse cron expressions and get the next scheduled run times with a plain-English description. Give one or more standard cron strings and get a clean table of upcoming runs, weekdays, and validity. Offline, no API key.

Professional email validation API with syntax check, DNS/MX verification, SMTP testing, disposable email detection, and catch-all domain checking. Validate single emails or bulk lists with detailed scoring and insights.

Validate email addresses with 8 layers of verification: syntax check, MX record lookup, SMTP verification, disposable email detection, role-based detection, typo suggestion, DNS validation, and deliverability scoring. Supports bulk validation.

Email Validation API

gentle_cloud/email-validation-api

Validate email addresses with syntax checks, DNS MX record lookup, disposable email detection, and role-based address detection. No API key required.

Email Verifier and Validator

coladeu/email-verifier-and-validator

✅ Professional-grade email verification with comprehensive validation: format checking, DNS/MX records, disposable email detection, typo detection, and mailbox validation.

Email Validation Api

ghewaretech/email-validation-api

Validate email addresses at scale with enterprise-grade accuracy. This API performs comprehensive email verification including syntax validation, DNS/MX record checks, disposable email detection, and optional SMTP mailbox verification.

🔥 7-DAY LAUNCH SPRINT (May 1–8, 2026): First 100 runs free for new users. Test regular expressions against sample text, get human-readable pattern explanations, find all matches with capture groups, and benchmark pattern performance. Supports common regex presets.