Launch on Hacker News

A Hacker News launch means the founder posts a working product to Hacker News and lets the discussion, plus anyone who picks it up from there, bring the first users. Two companies that did this published results. Candy Japan reached 300 paying subscribers within four months, and PostHog had hundreds of users within a month of its 2020 launch.

How it works

1. Ship something people can use today. PostHog posted its MVP just four weeks after the founders started writing code. Candy Japan had already shipped candy to three paying customers before it even had a website.
2. Post it yourself, in plain words. Once the site was up, the Candy Japan founder posted about it on Hacker News himself, and blogs then wrote about it on their own.
3. Let secondary coverage do the compounding. Bloggers read the post and wrote about the service with no outreach from the founder. Those backlinks, plus no competitors, made Candy Japan the top search result for "japanese candy". The post was one event, but the links and the ranking kept sending people after it.
4. Give people a place to keep finding you. For PostHog, the code lived on GitHub, where developers already look for new tools. An analysis of how PostHog grew says stars worked as social proof and the open-source format drew forks and contributions with little marketing.

The product type matters. Candy Japan sold a $25 monthly subscription of surprise Japanese candy, shipped twice a month. PostHog was open-source analytics for developers. Both were easy to understand from one short post. If your product needs a demo to make sense, a launch like this is a harder fit. For a comparable launch on another channel, see the Product Hunt launch playbook.

What it takes

Our estimate: about 12 hours of work, and about 7 days before you can read a signal. Most of the hours go into making the product usable without help: a signup that works on the first try, a landing page that explains the product in one screen, and a short post written by the founder. A few more hours go into answering every comment on launch day. Traffic shows up within hours, but you need about a week to see whether those visitors activate and come back, rather than just look.

What to measure

Count signups with a Hacker News referrer during launch week, compared with a normal week. This tells you whether the post reached people at all. A big spike with few signups means the landing page or the pitch failed.

Track activation for the launch cohort against your other sources. Launch visitors are curious, and curiosity is not intent. If they activate at a much lower rate than your usual users, the launch brought the wrong crowd.

Watch week-four retention of the launch cohort against earlier cohorts. A curve that flattens means you found real users. A curve that falls to zero means you found tourists. The guide to reading retention curves covers how to tell the two apart.

Track new backlinks and unprompted mentions in the weeks after posting. In Candy Japan's case, blog backlinks helped make the site the top result for "japanese candy". Last, compare paid conversions from the launch cohort with your prelaunch monthly baseline. That is the only reading that pays bills.

When it backfires

• You mistake a launch for a channel. Candy Japan's subscriber count sat near 300 for a long time before monthly recurring revenue passed $10k, as the founder wrote on his blog. A paid ad campaign that cost over $10k did not pay back and was stopped. Plan your next acquisition channel before launch day.
• The product is not wanted yet. PostHog's two founders built six products in nine months, and the earlier attempts needed heavy outreach to get used. A launch will not rescue a product people do not want.
• Your buyer is not in the audience. A post can bring visitors who will never pay, which inflates signups and buries your real activation rate.
• You count applause instead of users. Upvotes and GitHub stars are social proof, not usage. Report active users and paying customers.
• You launch half-finished. Broken signup on launch day wastes the attention of exactly the people most willing to try something new.

Run it as an experiment

We recommend this hypothesis: "Posting our product on Hacker News will bring more activated users in 14 days than our previous 14 days from all sources combined."

A split test is not possible here, so we recommend a before-and-after comparison with a fixed window: 14 days before the post against 14 days after it. Freeze other launches, ads and pricing changes during the window so the comparison stays clean.

Log the referrer for every signup, the time of the post, its peak rank, comment count, signups per hour, activation within seven days, and every backlink or mention you find. Tag the launch cohort so you can follow its retention for at least four weeks.

Our suggested decision rule: if the launch cohort beats the prior window on activated users and holds week-four retention close to your earlier cohorts, keep investing in the follow-on loops (search, community, content). If it wins on signups but loses on retention, treat it as a one-off awareness event and move on. Write it up with the growth experiment guide and score your next launch idea in the experiment backlog template.

How strong the evidence is

The grade is case with numbers: at least one company documented the move and published the result in numbers. Candy Japan carries most of it, with the founder's own figures in an interview and on his blog. PostHog's about page confirms its Hacker News launch, while the user figure comes from a third-party write-up.

The evidence has limits. Candy Japan's figures are self-reported, PostHog's user count comes from a third-party write-up, and neither company gives a baseline. The Candy Japan founder credits several factors together, including the blogs and search ranking, for the 300 subscribers. PostHog's hundreds of users are tied to the open-source pivot overall, not to the post alone. Later figures, such as Candy Japan's $8,200 in monthly sales and PostHog's 500,000+ teams, reflect years of growth and are not results of the launch.