Resurfacing Engine for Forgotten Hub Notes: startup idea with real demand

Resurfacing Engine for Forgotten Hub Notes is a startup idea for Obsidian users. Users link notes to hub ideas like [[Psychology]], but hubs quietly pile up dozens of links and are never revisited to see what has accumulated. A thread in r/ObsidianMD drew 22 upvotes and 11 comments between Sep 14, 2026 – Oct 14, 2026. People get by with Smart Connections and Spaced Repetition plugin, and that still leaves this job open. Hotness is 2.45, Cool. Mild annoyance. Price-sensitive audience. The thread drew 22 upvotes and 11 comments. Gaps in existing tools. A 1-2 week mvp. A first version is weekend-easy, about 1 week, priced under $10 a month and charged as a one-time purchase. The pain, the source, the alternatives, the scope notes, and the questions on this page are free to read and free to build from. The agent starter prompt is the paid part. The first slice is on the page. One credit unlocks the rest, to paste into a coding agent, download as Markdown, or send as a private link.

Weekend-easy 1 week MVP Plugin verified Oct 14, 2026

Verbatim quotes are added only after a manual check. Until then, the thread title is the excerpt. Exact post date and verbatim quotes pending enrichment.

Who has it

Obsidian users.

What people use now

Smart Connections
Spaced Repetition plugin

A way through

A plugin that uses spaced repetition to periodically surface hub notes with the most new connections, prompting a review.

MVP scope

Give Obsidian users a way to do this in one sitting: Spaced-repetition nudges that bring back the hub notes gaining the most new links.
Persist the result and show it again after a reload.
State the empty case when there is nothing to show yet, with one next step.
Charge later with a one-time purchase, under $10 a month. The free path must finish the core job once.
Ship the plugin only. Leave Smart Connections to keep the jobs they already do well.

How it could charge

One-time purchase · Under $10 a month · B2C · GLOBAL.

Hotness 2.45

2 of 5, Cool. Mild annoyance. Price-sensitive audience. The thread drew 22 upvotes and 11 comments. Gaps in existing tools. A 1-2 week mvp.

Why this score

Pain	2 / 5
Willingness to pay	2 / 5
Demand	1 / 5
Competition gap	3 / 5
Ease of build	4 / 5
Recency	5 / 5

Weights: pain 25%, willingness to pay 20%, demand 20%, gap 15%, ease 10%, recency 10%. Recency is recomputed every build. The source report’s 1–10 score is not shown.

Questions

Is this idea already taken?

People already use Smart Connections, Spaced Repetition plugin. Those options do not do the job in the solution above. The idea is free to build. Nothing here is an exclusive claim.

How hard is a first version?

Weekend-easy. A tight MVP is about 1 weeks (1 week), assuming the regulated or partner-gated parts are stubbed. The paid prompt turns that into tasks.

Who would pay, and how?

The audience is Obsidian users. Charge a one-time purchase, and test a price under $10 a month. Willingness to pay is one input to Hotness, not a promise that someone will buy.

Can I use the evidence?

Yes. Build the product. The thread title is a short excerpt with a link, not a quote we are putting in someone's mouth. Exact post dates and verbatim lines are added only after a manual check. Ideas are suggestions, not medical, legal, or financial advice.

Agent prompt

The first slice is public. The rest is fetched only after you unlock it, and it is not in this page’s HTML.

prd.md

# Agent starter prompt: Resurfacing Engine for Forgotten Hub Notes

You are a senior product engineer. Build only the product described in this document. If a detail is missing, choose the smallest option and write it down in the README. Do not invent a second product, a marketplace of marketplaces, or a growth hack.

## Product
Name: Resurfacing Engine for Forgotten Hub Notes
One line: Spaced-repetition nudges that bring back the hub notes gaining the most new links.
Shape: Plugin
AI stance: AI-assisted
Region for v1: Global
Hotness (context only, not a requirement): 2.45 (cool). Mild annoyance; price-sensitive audience; thread engagement 22▲/11💬 (demand 1/5); gaps in existing tools; a 1-2 week mvp.

## Problem
Users link notes to hub ideas like [[Psychology]], but hubs quietly pile up dozens of links and are never revisited to see what has accumulated.

Who feels it: Obsidian users.

Unlock the rest with 1 credit.

A free business write-up of this idea sits on the sister site. Free business plan prompt

Productivity & Notes3.75