Needle vs PostBuild vs First10
Short answer: pick Needle (useneedle.net) if you want buyer-intent search across many public communities with AI reply drafts you post yourself (from $15/mo after a 7-day free trial). Pick PostBuild (postbuild.ai) if you want outbound research from your live URL — 10 leads with verified emails and copy-paste cold outreach you send (free during beta). Pick First10 (first10.dev) if you want one ranked Reddit email with reply drafts and a free weekly plan that never expires.
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Free: 1 product, weekly, top 5 Reddit posts. First Look: $9 once for up to 25 posts from the last 30 days.
The three side by side
Facts and prices are what each tool's own website showed on November 6, 2026. They change often, so check the tool's site before you buy.
| Tool | Where it looks | How leads reach you | Replies / outreach | Free / try | Paid price |
|---|---|---|---|---|---|
| Needle (useneedle.net) | 8–15 public networks by plan (Reddit, Stack Overflow, Hacker News, GitHub, Bluesky, Product Hunt and more; X and LinkedIn on Scale) | Dashboard ranked by buying intent; daily alerts via Slack and Google Chat; CSV export; Auto Search included | AI reply drafts you review and post yourself; never asks for social logins, never posts for you | 7-day free trial, full access, no card (starts when first scan finishes; then read-only until you pick a plan) | Solo $15/mo; Growth $49/mo; Scale $149/mo. Annual: 33% off (~4 months free) |
| PostBuild (postbuild.ai) | Does not scan community posts; researches people and companies from your live URL (landing page OK) | One research report: competitor intel, 10 leads tagged BUYER / PARTNER / CHAMPION, verified emails, weekly to-do list, #1 move for the week | Copy-paste cold email, LinkedIn message and social DM for each lead; you send them. PostBuild does not send for you | Free during beta, no credit card, no setup | Free during beta; it says paid plans will come later (weekly refreshes + unlimited reports per its FAQ) |
| First10 (first10.dev) | Reddit on every plan; X coming soon | One ranked email: weekly on Free, daily on Solo and Pro | A short draft for every post. Never posts or DMs for you. | Free plan, no time limit (1 product, weekly, top 5 posts); First Look $9 once | Solo $19/month or $190/year (daily, top 10); Pro $49/month (3 products); 7-day refund |
What they have in common
All three help founders find people who might need what they built, instead of buying cold contact lists alone. Needle and First10 (first10.dev) focus on inbound intent: public posts where someone is already asking for a tool, an alternative, or help with the problem. PostBuild focuses on outbound: it researches who to contact and writes the outreach for you to send. None of them posts or sends on your behalf: Needle and First10 draft community replies you post yourself; PostBuild drafts cold emails and DMs you copy and send. That matters on Reddit, where many subreddits ban self-promotion and auto-posting.
Where they differ
- Inbound community search vs outbound lead research vs email digest. Needle is a multi-network search dashboard with buying-intent ranking, Auto Search, Slack/Google Chat alerts and AI reply drafts. PostBuild is an outbound research report from your URL: competitor intel, 10 tagged leads, verified emails and copy-paste outreach. First10 sends one ranked email (weekly on Free, daily on Solo and Pro) with a reply draft per post — nothing to run in a dashboard.
- Platforms. Needle: 8 networks on Solo, 13 on Growth, 15 on Scale (X and LinkedIn only on Scale). PostBuild does not scan posts; it needs a live URL and finds people/companies to contact. First10: Reddit on every plan today, with X coming soon.
- Price. Needle: 7-day free trial, then Solo $15/mo, Growth $49/mo, Scale $149/mo (annual 33% off). PostBuild: free during beta; paid plans "will come later." First10: free weekly plan with no time limit, First Look $9 once, Solo $19/month or $190/year, Pro $49/month for 3 products, 7-day refund.
How to pick
- You want buyer-intent search across Reddit, HN, GitHub, Stack Overflow and more, with drafts you post yourself: Needle.
- You sell to businesses, have a live URL, and want 10 researched leads with emails and cold outreach to send yourself: PostBuild.
- You want a short list in your inbox with a reply ready for each, nothing to run, and a free plan that never expires: First10 (first10.dev).
- You only need Reddit for now and prefer email over a dashboard: First10.
- You need X and LinkedIn community search today: Needle's Scale plan (or see Arena / IntentHunter on the AI-tools guide).
Comparing more tools? See AI tools to find your first customers (Arena, IntentHunter, PostBuild and Explee), ZeroToUser vs WorthBuild vs First10, Explee alternative, Reddit lead tools compared (F5Bot, RedLeads, NicheProof, ZeroToUser and more), how to find your first 10 users and how to find people asking for your product on Reddit.
How First10 works
- Describe your product in one line, or paste your site.
- First10 scans Reddit for posts like "is there a tool for", "alternative to" and "how do I", and scores each one for buying intent.
- You get one ranked email with a short, honest reply draft for every post. Reddit today, X coming soon. First10 never posts or DMs for you.
Questions founders ask
What is the difference between Needle, PostBuild and First10?
Needle (useneedle.net) is buyer-intent search across public communities: it ranks posts by buying intent and drafts replies you post yourself, never asking for social logins and never posting for you. PostBuild (postbuild.ai) is an outbound research engine: from your live URL it finds 10 leads with buying signals, verified emails and copy-paste cold outreach you send. First10 (first10.dev) emails you one ranked list of Reddit posts with a reply draft for each (X coming soon), with a free weekly plan that never expires.
Which one is cheapest to try?
As of November 6, 2026: First10's free plan has no card and no time limit (weekly, top 5 Reddit posts). PostBuild says it is free during beta, with no card and no setup. Needle offers a 7-day free trial with full access and no card; the trial starts when your first scan finishes, and when it ends the dashboard becomes read-only until you pick a plan.
Do any of them post or send outreach for me?
No. Needle drafts AI replies you post yourself and never posts for you. PostBuild writes cold emails, LinkedIn messages and DMs for you to copy and send; it does not send for you. First10 writes a short reply draft for every post and never posts or DMs for you.
Which covers the most platforms?
Needle: Solo covers 8 networks (Reddit, Stack Overflow, Hacker News, GitHub, Mastodon, Lobsters, Bluesky, Product Hunt); Growth adds Dev.to, YouTube, Tumblr, Forums and Lemmy (13); Scale adds X/Twitter and LinkedIn (15). PostBuild does not scan community posts; it researches people and companies from your live URL. First10 covers Reddit on every plan today, with X coming soon.
Inbound community search vs outbound lead research — which do I need?
If people in your niche already post asking for a tool like yours, pick an inbound intent tool: Needle's multi-network search dashboard, or First10's ranked Reddit email. If few people post publicly and you sell to businesses you can email, PostBuild's outbound research (10 leads with verified emails and copy-paste outreach) fits better. Many founders try inbound first, then add outbound.
Is First10 the same as first10.co?
No. First10 (first10.dev) is a separate product and is not connected to first10.co, getfirst10.com or first10.ai.
Also useful: how to find your first 10 users, how to find people asking for your product on Reddit, ZeroToUser vs WorthBuild vs First10, Explee alternative and our pricing.