Real products.
Built with AI agents.
Live today.
Tools for DNS, email authentication and inbox placement — plus a few built purely for fun. Every one was specified, built and shipped with LLMs and agentic tooling, and every one is live.
Email deliverability
The core suite. Diagnostics, monitoring and testing for the people who have to get mail into the inbox and keep it there.
InspectorDNS
An email-deliverability command center. Analyzes a domain’s DNS records, monitors them continuously and emails you the moment one changes. Dissects email authentication and full message headers through a Postfix MTA, checks blocklists through API integrations, pulls Google Postmaster Tools data into a dashboard, and backs it all with a DNS and authentication knowledgebase.
inspectordns.com →BIMI.io
The one-stop shop for Brand Indicators for Message Identification. Learn how BIMI works, validate the logo you have today, generate the DNS record, convert your SVG to spec and host the image — then get certified on it all through BIMI Academy.
bimi.io →Inbox Placement Rate
A multi-user inbox seed-testing tool. Send to a seed list and see where your mail actually lands before your real audience does.
inboxplacementrate.com →Inbox Dude
Two diagnostics in one. Analyze a domain’s email authentication setup, and identify which mailbox provider sits behind any address.
inboxdude.com →Antispam Project
A spamtrap monitoring platform. Analyzes mail hitting trap inboxes, parses the headers, catalogs the ESPs behind each message, and offers header search and reporting across everything it has seen.
app.antispamproject.org →Deliverability Monitor
Send a message in, get its deliverability signals back. The original email-analysis tool and the direct precursor to the Email-to-Analyze feature now built into InspectorDNS.
mailtrapper.com →Developer tools
Utilities that turn a tedious lookup or a hairy query into a paste-and-go.
SQL Helper
Analyzes SQL queries for errors and optimization opportunities, generates SQL from a plain-English prompt, and includes a proprietary Query Builder that takes the guesswork out of joins.
sql.justinfrechette.com →DNS Check Tool
Single or bulk DNS lookups for any list of domains. The lean first version of the idea that grew into InspectorDNS.
dns.justinfrechette.com →Email Address Parser
Paste an email address, get the mailbox provider behind it. One job, done instantly.
parser.justinfrechette.com →For fun
Built because they were worth building. Same process, lighter subject matter.
EHLO.LOL
An old-school dial-up modem screeches to life, connects, and walks you through a full SMTP transmission — narrated with critical levels of sarcasm and redressed for every season.
ehlo.lol →Postcards From Space
NASA’s Astronomy Picture of the Day, delivered to your inbox every morning. Powered by the NASA API.
postcardsfromspace.com →Morning Word
A new vocabulary word in your inbox every morning, with its definition pulled live from the Merriam-Webster API.
morningword.net →Would You Rather
A dinner-table game that gets families actually talking. One question at a time, no screens required once the question is on the table.
wouldyourather.justinfrechette.com →Draw Uno
An ad-free, easy-to-use way to play UNO in the browser. Built for a tablet-sized screen and for anyone who wants the game itself — no ads, no bells and whistles, just the cards.
drawuno.com →Aunt Amy’s Pets
A pet-sitting business site, currently under construction. Same build process as everything above, applied to a small local business.
auntamyspets.com →