Hacker Search vs Undermind
Side-by-side comparison of features, pricing, and ratings
At a glance
| Dimension | Hacker Search | Undermind |
|---|---|---|
| Pricing | Free | Freemium (Pro plan for full-text analysis) |
| Best For | Developers, founders, tech enthusiasts researching HN opinions | Academic researchers, R&D teams, graduate students |
| Key Feature | Semantic search + LLM summaries over 3 years of HN comments | Exhaustive citation-traced literature search with follow-up questions |
| Search Scope | HN comments and submissions (past 3 years) | Academic papers with citation graph traversal |
| API Access | Not mentioned | Not for teams needing extensive API (as per 'not for') |
| Latest News | Screenpipe (YC S26) launched on HN with 86 points (2026-07-23) | No recent news |
Choose Hacker Search if you need quick, free access to HN's collective wisdom on tech topics—it's ideal for developers and founders looking for community sentiment. Pick Undermind if you're an academic or R&D professional who needs exhaustive, citation-backed literature reviews that go deep into papers, even if it takes a few minutes. Both are niche but excellent: one for community opinions, the other for rigorous research.
Discontinued: Hacker Search, the semantic search tool for Hacker News, is no longer available.
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AI co-researcher for deep literature search that follows citation trails to find the papers you'd miss
Visit WebsiteWhat real users say: Hacker Search vs Undermind
Not marketing copy and not our opinion — a structured sweep of public discussion (reviews, forums, communities and video comments), showing what people praise and what they complain about for each tool.
Hacker Search
16 mentions across 2 sources · 25% positive — critical (averaged across 2 sources)
Hacker News, Lemmy
What users praise
- • Semantic search finds conceptually related content without exact keywords.
- • LLM summaries of top comments provide quick, digestible insights.
- • Links to actual comments enable verification of summaries.
- • Designed specifically for the high-quality Hacker News dataset.
What frustrates them
- • Almost no community feedback available to assess reliability.
- • Only 3 years of data; older discussions are inaccessible.
- • Beta status means features may change or disappear.
- • No mobile or API integration mentioned.
Researched Jul 3, 2026
Undermind
62 mentions across 4 sources · 48% positive — mixed (averaged across 4 sources)
Hacker News, YouTube, Product Hunt, Bluesky
What users praise
- • Exhaustive citation-traced searches uncover obscure but relevant papers.
- • Inline citations allow verification of AI claims back to source.
- • Free tier provides substantial depth and proactive updates.
- • Built by MIT physics PhDs adds credibility and domain expertise.
What frustrates them
- • Search speed is slow (3-6 minutes) for impatient users.
- • Lacks reference manager integration like Zotero or Mendeley.
- • No API access reported, limiting programmatic use.
- • Results can prioritize relevance over novelty.
Researched Jul 16, 2026
Who should pick which
- Developer researching a new libraryPick: Hacker Search
Hacker Search lets you ask 'What do people think about [library]?' and get a summary of HN comments—perfect for gauging real-world developer sentiment quickly and for free.
- PhD student doing literature reviewPick: Undermind
Undermind's deep search follows citation trails and asks clarifying questions, ideal for exhaustive reviews where missing a key paper is not an option. It also helps brainstorm research directions.
- Tech founder gauging market sentimentPick: Hacker Search
Hacker Search provides community sentiment analysis on topics like startup ideas, giving founders quick, free insights from HN's tech audience.
- R&D team assessing noveltyPick: Undermind
Undermind identifies gaps in literature and generates custom tables, helping R&D teams in pharma or biotech evaluate the novelty of their work.
- Casual tech enthusiastPick: Hacker Search
Free and easy to use for exploring HN discussions on current tech trends—no sign-up required to start searching.
Frequently Asked Questions
Hacker Search vs Undermind: which should you choose?
Choose Hacker Search if you need quick, free access to HN's collective wisdom on tech topics—it's ideal for developers and founders looking for community sentiment. Pick Undermind if you're an academic or R&D professional who needs exhaustive, citation-backed literature reviews that go deep into papers, even if it takes a few minutes. Both are niche but excellent: one for community opinions, the other for rigorous research.
Does Hacker Search cover all of Hacker News history?
No, it indexes comments from the past three years only. Older discussions are not included.
How long does Undermind take to deliver results?
Undermind typically takes 3-6 minutes per search, as it reads and evaluates hundreds of papers.
Can I get API access to Hacker Search?
The provided data does not mention API access for Hacker Search; it's likely not available.
Does Undermind integrate with reference managers like Zotero?
No, Undermind explicitly states it is not for users who rely on reference manager integrations such as Zotero or EndNote.
Is Hacker Search's LLM summary based on all comments or a subset?
The summary is generated from relevant comments returned by semantic search, which covers all HN comments from the past three years.
What does Undermind's Pro plan include?
The Pro plan adds full-text analysis of papers. Other details like price are not specified in the provided data.
Can I search for submissions on Hacker Search?
Yes, Hacker Search supports semantic search for HN submissions in addition to comments.
Does Undermind send notifications for new papers?
Yes, Undermind includes notifications for new relevant publications, keeping you updated.
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Last reviewed: July 30, 2026