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growth/launch-show-hn.md

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+# One-shot launch: Show HN + r/InternetIsBeautiful
+
+**Goal:** NOT the day-one spike (HN is US-skewed for an England-only tool; outbound links are nofollow).
+The real payoff is **2–5 aggregator/reblog backlinks that start your domain-authority clock**, plus
+1–3 UK referral relationships. Treat it as a backlink seed, then walk away.
+
+**Rules of engagement**
+- Post **Tue–Thu, ~14:00–17:00 UK** (≈9–12am US Eastern). One platform each, same week.
+- The link target is a **cheaper-twin STORY page** (e.g. `{{FLAGSHIP_TWIN_PAGE_URL}}`), **never the cold map** or a bare filter UI.
+- Be present ~2–3h to answer data-method questions, then stop.
+- Post the **maker comment first**, immediately after submitting.
+- Both qualify only because the map has **no sign-up wall**; keep it that way for launch day.
+
+---
+
+## Show HN
+
+**Title** (HN dislikes hype; lead with the mechanism + "open data"):
+
+```
+Show HN: Perfect Postcode, ranking every England postcode by what £1 of housing buys
+```
+
+Alternatives if you want to A/B in your head:
+- `Show HN: I joined Land Registry, EPC, Ofsted and crime data to find England's "cheaper twin" postcodes`
+- `Show HN: A no-signup map that ranks all of England by price per m², schools, commute and crime`
+
+**Maker comment** (post as the first comment):
+
+```
+Maker here. Perfect Postcode ranks every postcode in England by what each £ actually buys
+(£ per m² of floor space, Ofsted school catchments, commute time, crime, broadband, noise)
+instead of by area reputation. It's a single cross-join of official open data (HM Land Registry
+price-paid, EPC floor areas, Ofsted, DfT, ONS, Police.uk) over ~13M sales.
+
+The thing I find most fun: "cheaper twins", pairs of adjacent postcodes that share a station,
+a school catchment and a build era but sell tens of thousands apart because one name got bid up.
+Example: {{FLAGSHIP_TWIN_ONE_LINER e.g. "Angel N1 vs Holloway N7: same line, overlapping
+catchment, ~30% less per m²"}}.
+
+No sign-up, no card. The map's free to explore: {{FLAGSHIP_TWIN_PAGE_URL}}
+
+Honest caveats: England only for now (Scotland/Wales need different source datasets); EPC floor-area
+coverage is sparse before 2012 so I exclude pre-2012-only properties from the £/m² figures; "estimated"
+prices are comparison estimates, not valuations. Happy to go into the £/m² derivation, postcode-boundary
+handling or the EPC gaps. Ask away.
+```
+
+Be ready for these HN questions (have a one-paragraph answer each):
+- How is £/m² derived, and how do you handle properties with no recorded floor area?
+- Postcode vs postcode-sector boundaries: what granularity are the "twins" at?
+- What's the business model? *(Answer plainly: free map, one-time lifetime unlock for >3 filters, no subscription. Do NOT lead with this.)*
+- Data licensing. *(OGL v3.0 in aggregate; you never expose address-level rows.)*
+
+---
+
+## r/InternetIsBeautiful
+
+Read the subreddit rules the day you post (they change). It must read as a genuinely interesting
+*thing to explore*, not an ad; the no-signup map is what makes it allowed.
+
+**Title** (their format is a plain description of the site):
+
+```
+Every postcode in England, ranked by price-per-m², schools, commute and crime (no signup)
+```
+
+**First comment** (shorter, less "founder", more "here's a cool thing"):
+
+```
+Built this from official open data (Land Registry sold prices + EPC floor areas + Ofsted + DfT +
+Police.uk). The bit people seem to like is "cheaper twins": two postcodes next to each other with the
+same station and school catchment, priced thousands apart just because of the name. England-only for
+now. No account needed; link goes straight to a worked example you can poke at.
+```
+
+---
+
+## After the launch (same day, 10 minutes)
+
+- Note every domain that reblogs/aggregates the HN post (e.g. hckrnews, Hacker News Daily, niche newsletters). Those are your seed backlinks; log them in your metrics sheet.
+- Do **not** repost to other subreddits in a blast. One IIB post, done.