Tech Tool Hub – Smart Home Secrets
YAML Validator, YAML Generator, and Jinja2 Template Tester. If you are writing or debugging automations, start here.
DNS Tools and Security Tools for anyone running a homelab or self-hosted setup with external access. Check DNS propagation, SSL certificates, and email authentication.
Colour picker for HA-ready RGB and Kelvin values, plus Z-Wave and Zigbee device lookups to check compatibility before you buy.
I built these because I kept needing them. Validating YAML before pasting it into Home Assistant. Checking DNS propagation after moving a domain. Testing Jinja2 templates without touching a live system. There was no single place that had all of it, so I made one.
Every tool here runs in your browser. No account required, no data sent to any server, nothing logged. Free to use, free to share.
All Tools
DNS Tools
Check DNS propagation across global resolvers, run WHOIS lookups, look up any IP address, and verify SPF, DMARC, and DKIM records in plain English.
YAML Validator
Paste your Home Assistant automation YAML and check it for syntax errors before saving it to HA. Shows the exact problem line with plain-English error messages.
YAML Generator
Choose from 27 Home Assistant automation templates, fill in your entity IDs, and get copy-paste ready YAML. Includes real automations like WFH morning check and morning music ask.
Jinja2 Template Tester
Test Home Assistant Jinja2 templates without logging in to HA. Supports states(), state_attr(), is_state(), now(), and all common filters. Define mock values in JSON.
Security Tools
Check SSL certificate expiry and chain validity, and analyse raw email headers to trace routing and verify SPF, DKIM, and DMARC authentication results.
Customization Tools
Pick a colour and get HA-ready RGB and colour temperature YAML. Search 2,000+ Z-Wave JS certified devices and 5,000+ Zigbee2MQTT supported devices.
These tools are free and always will be.
If they saved you time or helped you fix something, consider supporting the site. Everything here is built and maintained by one person in between running a real smart home and a real business. No ads, no subscriptions, no data harvesting. If you want to keep it that way, a small contribution goes a long way.
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