Ad-free Built for DevOps & backend work

HeffTools

Practical utilities for DevOps, SREs, and backend engineers — fast web tools when you’re in a hurry, and stable APIs when you’re automating.

No popups. No “SEO fluff.” Just tools you can trust in terminals, pipelines, and production.

Use Free Tools Get API Access (RapidAPI)

Web tools: no signup · APIs: keys, quotas, analytics, and billing via RapidAPI.

curl example API 
curl --request POST \
  --url https://hefftools.dev/api/v1/cron/explain \
  --header 'Content-Type: application/json' \
  --header 'X-RapidAPI-Key: <your-rapidapi-key>' \
  --data '{
    "expression": "0 5 * * 1"
  }'
Use it in CI/CD, internal tooling, monitors, and scripts.

Free Web Tools

View all tools →

Built for real ops work: quick checks, safe conversions, clean output. Always ad-free.

UUID & Passwords

Generate UUIDv4 values and secure random passwords for testing, secrets, and automation.

  • GET /api/v1/uuid/generate
  • GET /api/v1/password/generate
UUID Generator Password Generator

Regex & Text Tools

Test patterns, encode/decode URLs, and convert between JSON, YAML, and CSV without surprises.

  • POST /api/v1/regex/test
  • POST /api/v1/url/encode, /url/decode
  • POST /api/v1/convert
Regex tester URL Encoder/Decoder JSON / YAML / CSV Converter

Cron & Networking

Understand schedules and network ranges fast — useful in incident response, migrations, and audits.

  • POST /api/v1/cron/next-runs
  • POST /api/v1/subnet/calc
Cron tool Subnet tool

Production APIs

View on RapidAPI →

When you need repeatability: use the same logic behind the web tools via stable endpoints. Subscribe via RapidAPI for higher limits, keys, analytics, and billing.

Cron & Scheduling API

Explain cron expressions, compute next runs, and return human-readable schedules for dashboards and alerts.

  • POST /api/v1/cron/explain
  • POST /api/v1/cron/next-runs (elevated limits)
Learn more

Config Generator API

Generate systemd service units and Nginx reverse proxy configs from simple JSON inputs.

  • POST /api/v1/systemd/generate
  • POST /api/v1/nginx/reverse-proxy
Learn more

Network, Logs & Security

Resolve DNS, parse logs, diff JSON, hash data, and inspect SSH keys — without stitching together five tools.

  • GET /api/v1/dns/resolve, /dns/mx
  • POST /api/v1/logs/parse, /diff/json
  • POST /api/v1/hash/sha256, /hash/hmac-sha256
  • POST /api/v1/ssh/key/fingerprint
Network & DNS Security & Crypto

How it works

1. Use web tools

Use the tools in your browser for quick answers during builds, incidents, reviews, and debugging. No login. No ads. Just output.

2. Get API keys via RapidAPI

When you’re ready to integrate, subscribe on RapidAPI for keys, quotas, usage analytics, and simple team-friendly billing.

3. Automate in production

Call the APIs from CI/CD, internal platforms, monitoring, or AI agents to automate the boring stuff and keep focus on real engineering work.