WhereToPost — describe your need, get the right communities

Stop guessing subreddit names; turn one sentence into the communities worth posting in

Problem

A developer built Reddit tooling and heard the same feedback repeatedly: search assumed you already knew the community name. But reality is the opposite — "I built a productivity tool for indie hackers and need early users, where do I post?" contains no subreddit name, and literal Reddit search returns nothing. This lands on top of the endless indie complaint that building is easy and selling is hard: the product is done and nobody knows where the first users are.

Solution

A need-to-community matcher. The user describes the product, target user, and stage in plain language; the system embeds 100k+ subreddits, Discourse forums, Slack/Discord groups, and newsletter submission pages into a vector store, then reranks by activity, rule strictness, and self-promo tolerance. Output is where to post, a rules summary, examples of similar products that did well there, and suggested timing.

Users

Indie developers, solo SaaS founders, and early-stage tool makers going international for the first time with no community network.

MVP

Crawl and embed subreddit descriptions and rules; one product description returns top 20 communities with match reasons; each community ships a rules red-line summary and a post template; filter by promo-allowed vs promo-forbidden; save past matches for lightweight A/B tracking.

Revenue

Free tier of 5 matches per month; $9–19/month subscription for unlimited matches, rule updates, and a template library; optional one-time paid "launch battle pack" report.

Why now

AI collapsed build costs so distribution is the only bottleneck, while Reddit/Discourse search still does literal matching — vector retrieval plus rerank is now cheap and accurate enough for a solo dev.