Ad-free Built for DevOps & backend work

HeffTools

Practical tools for DevOps, SREs, and backend engineers — free web utilities, downloadable CLI tools, and stable APIs for automation.

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

Use Free Tools Explore CLI Tools Get API Access (RapidAPI)

Web tools: no signup · CLI tools: local-first and CI-friendly · 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.

Fail earlier in CI

Catch dependency install failures and maintenance-risk signals before the rest of the pipeline wastes time.

Keep checks local-first

Use small downloadable CLI tools in your own environment instead of adding another hosted platform to the stack.

Get deterministic output

Clear exit codes, machine-readable output, and practical diagnostics designed for real CI/CD workflows.

Python CI Tools

Downloadable CLI tools for dependency reliability and CI guardrails.

buildguard

Catch upstream Python dependency breakage before CI fails.

Verifies that your pinned requirements still install cleanly in a fresh environment before the rest of the pipeline runs.

View buildguard

depguard

Detect long-term Python dependency maintenance risk.

Flags dependencies that show signs of abandonment or maintenance decay before they become operational problems.

View depguard

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. Add CLI tools to CI

Use downloadable tools like buildguard and depguard in your pipelines when you need deterministic checks that run locally.

3. Automate with APIs

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