You have read dozens of generic guides. This startup launch checklist is different. It is built for the exact moment you switch your project from private to public.
That is when small config errors become visible to everyone. Most founders prepare for launch by adding features. They should be removing failure modes instead.
A good product launch checklist does not ask if your onboarding flow is pretty. It asks if your SSL certificate will renew while you are asleep.
Why Most Checklists Fail Under Load
Generic lists tell you to "build buzz" and "prepare assets." That advice is useless when your Postgres connection pool maxes out on the Hacker News front page.
What actually breaks in public is mechanical failure. DNS propagation delays, missing www redirects, and email SPF records that land your welcome message in spam. These are not exciting problems. They are embarrassing ones.
Your launch day checklist should focus on the gap between your dev environment and the public internet. That gap is where users live. You do not.
If you have not tested it from a clean browser profile on a network you do not control, you have not tested it. Borrow a friend's phone. Use coffee shop Wi-Fi.
Infrastructure: The Hidden Half of Your Startup Launch Checklist
Your domain name is your first server. Before anyone sees your UI, they meet your DNS registrar, your CDN, and your certificate authority. If any of these three cough, your launch is over before your page renders.
Founders often buy a domain, point an A record at their VPS, and call it done. That is not enough. You need to verify www resolution, apex redirect behavior, and whether your SSL cert covers both. Cloudflare's universal SSL can take up to 24 hours to propagate edge certificates for brand-new zones. If you bought the domain this morning, you might be serving an untrusted cert by noon.
Check your email infra, too. If you send signup confirmations from a root domain without DKIM and SPF, Gmail will flag you. Users cannot log in. Your launch dies.
Your email reputation is especially cruel. You cannot fix it in an afternoon. If your domain is new, warm it up by sending low-volume transactional mail for a week before launch. Otherwise, Gmail treats you like a stranger.
Here is a shell sequence I run before every public switch-flip:
curl -sI https://namemyapp.com | grep -i location
curl -sI https://www.namemyapp.com | grep -i location
echo | openssl s_client -servername namemyapp.com -connect namemyapp.com:443 2>/dev/null | openssl x509 -noout -dates -issuer
dig TXT namemyapp.com +short | grep "v=spf1"
dig TXT _dmarc.namemyapp.com +short
Run these from a separate machine, not your dev laptop. Your local /etc/hosts should not be the only thing making your site reachable.
The 90-Minute Startup Launch Checklist
This is the actual sequence. Work through it in order. Do not skip steps because you checked them yesterday. Caches expire, configs revert, and anxiety makes you miss details.
Your kill switch is your insurance policy. Know how to roll back your latest deploy in under two minutes. Have the command in your clipboard.
- Clear your caches. Purge your CDN edge cache and restart your app servers. Stale CSS will break your new landing page layout for half your visitors.
- Run the link audit. Click every external link on your homepage. That includes your privacy policy, your Twitter handle, and your Calendly booking link. Typo'd
hrefs survive code review constantly. - Check your error trackers. Open Sentry, LogRocket, or whatever you use. Mark all existing issues as resolved or acknowledged. You need to know that new errors are actually new.
- Test transactional flows. Sign up with a fresh email. Click the verification link. Trigger a password reset. Do this on mobile Safari, not Chrome on your MacBook.
- Scale your compute. If you are on Render, Railway, or Fly.io, bump your instance count or enable auto-scaling for the day. A
$5droplet from DigitalOcean will not survive a traffic spike. - Prepare your rollback. For Vercel, that is one click in the dashboard. For a VPS, that might mean
git revert HEAD && ./deploy.sh. Time yourself. - Post once, then watch. Do not publish your announcement and immediately go to lunch. Stay online for sixty minutes. Most failures show up in the first thousand visits.
What to Monitor in the First Hour
After you flip the switch, your job is observation, not promotion. Resist the urge to refresh your Twitter notifications. Refresh your metrics instead.
Watch your HTTP 5xx rate in your CDN or load balancer logs. A spike means your app is choking. Then check these signals:
- Sign-up conversion rate. If traffic is high but registrations are flat, your form is broken or your OAuth callback is failing.
- Payment flow health. If you charge from day one, run a live
$1test transaction. Stripe test mode does not catch webhook signature mismatches in production. - Support inbox. The first three emails you receive will reveal the bug that affects the next three hundred users.
- Social preview validity. Use an absolute path for your
og:image. A relative path will 404 on every platform crawler.
The table below shows the gap between what founders usually verify and what actually breaks in public. Use it as a sanity check. Print it if you have to.
| What Founders Check | What Actually Breaks | Risk Level | Prevention |
|---|---|---|---|
| "Does the homepage load?" | Apex domain serves www redirect loop |
High | Test both curl -L paths |
| "Is the logo centered?" | Email verification hits spam | High | Verify DKIM, SPF, DMARC |
| "Does Stripe work in test mode?" | Webhook endpoint returns 401 in prod | Critical | Send live $0.50 ping |
| "Is the app responsive?" | CDN serves stale CSS to 50% of users | Medium | Purge cache pre-launch |
| "Are social previews pretty?" | og:image URL is 404 after deploy |
Medium | Use absolute paths, test with debugger |
Domains and the Details That Derail You
Your name is your first impression. But the infrastructure behind it determines whether that impression loads. I have seen founders pick a perfect .com, build for six months, then realize their registrar charges extra for WHOIS privacy and has no API for DNS updates.
If you are still choosing, compare the operational reality of common paths. Not all registrars are equal when you are under pressure.
- Legacy registrars like GoDaddy or Namecheap work fine for parking. Their dashboards are cluttered with upsells, but their DNS propagation is reliable.
- Cloud-native registrars like Cloudflare Registrar or AWS Route 53 sell at wholesale cost without markup, which keeps a
.comaffordable. The trade-off is ecosystem lock-in. - Novelty TLDs like
.ioor.devlook modern. Google Registry runs.devand forces HSTS preload, meaning you must have SSL before the domain resolves. You cannot test over HTTP.
Buy your domain at least one week before launch. DNS TTL changes, certificate issuance, and email reputation all need time to settle. A domain purchased this morning is a liability this afternoon.
FAQ
Do I really need a separate launch day checklist if I already have a product roadmap?
A roadmap tracks what you will build. A launch day checklist verifies what you already built actually works under public load. The two tools solve different problems. Keep your roadmap in Notion. Keep your checklist in a note you can check off while your heart rate is elevated.
What is the most common thing to break during a startup launch?
Email delivery. Founders test signup flows with the same Gmail account that already trusts their domain. A new user on Outlook or Yahoo sees the verification email hit spam, or the link uses http:// while their inbox enforces HTTPS. They cannot log in, so they leave and do not come back.
How early should I buy my domain before launch?
At least seven days. SSL certificates need time to propagate through certificate transparency logs. DNS changes need time to exceed old TTL values. Email providers need time to see your domain as legitimate rather than freshly registered spam bait. If you must launch sooner, use a subdomain of an established domain you already own. This preserves your reputation and lets you move fast.
Should I announce on Product Hunt, Hacker News, or Twitter first?
Post to your smallest channel first. Treat it as a dress rehearsal for your infrastructure. If your database falls over, better it happens in front of two hundred Twitter followers than twenty thousand Product Hunt visitors. Once your metrics look flat for thirty minutes, post to the bigger stage. Patience here saves your reputation.