Free tools for startup research and prospecting
Each tool does one job you can finish on that page: check a domain, find an email, score a site for agents, or turn a video into a post. Start here when you are not sure which one, then open the tool that matches the task.
35 tools, no signup to try.
Email and contacts
5 tools
- Email ValidatorCheck whether an address is deliverable before you send to it. Use it on a list, a single guess, or an address an agent just found.
- Email FinderFind a work email from a name and a company domain. Use it when you know who you want and not their inbox.
- LinkedIn Email FinderPaste a LinkedIn profile URL and get the verified work email. Use it when the profile is all you have.
- Find Emails by DomainEnter a company domain and get the people receiving mail there. Use it when you have the company but no name.
- Bulk Email VerifierPaste a list or a CSV and get a verdict on every row. Use it before a send, not after the bounces.
Website audits
7 tools
- AI Agent ReadinessScore how well an agent can read and use a site: llms.txt, MCP, schema, and payments. Use it before you claim a site is agent-ready.
- API and MCP Security ScannerSee what an API or MCP server gives a stranger: transport, auth, CORS, rate limits, and which tools answer with no credentials. Use it before you publish an endpoint.
- Website Speed TestPageSpeed and Core Web Vitals for mobile and desktop, lab and field. Use it when a slow site is the question, not the stack.
- Tech Stack CheckerSee hosting, frameworks, analytics, payments, and mail setup behind any site. Use it to know what a company actually runs before you pitch them.
- Trust and ReputationA 0 to 100 trust score from security, privacy, and public record. Use it when you need a reputation check, not a backlink score.
- Website Exposure CheckFind API keys and tokens a site leaks in its public code, and the other sites that share its analytics and ad IDs. Use it before a stranger finds them first.
- Website CheckupOne run checks a startup site for speed, security, agent readiness, authority, stack and blog, then finds its investor matches and closest competitors. Use it before a launch or a raise.
SEO and visibility
4 tools
- AI Visibility CheckAsk ChatGPT, Claude, Perplexity and Gemini the questions your buyers ask, and see whether they name you or a competitor. Use it to find the questions and sources where you are missing.
- Ahrefs DR CheckerLook up Ahrefs Domain Rating, 0 to 100, for any domain. Use it when you need the backlink number without a seat.
- Effective Domain RatingA 0 to 100 read of visibility that is actually realized, set next to Ahrefs DR. Use it when a high DR is not showing up in search or AI answers.
- Search Suggestion ExplorerSeed a phrase and see live autocomplete-style suggestions. Use it before you pick a title, meta line, or profile focus keyphrase.
Prospecting and research
7 tools
- MonitorWatch a company site for pricing, jobs, and leadership changes. Use it when a profile should ping you instead of you rechecking it.
- Find MatchesMatch with investors or startups and get a reason for each pair. Use it to start a list, then open the profiles that fit.
- Deep IntelligenceOne name, domain, or email returns a public-record dossier. Use it when a profile is not enough and you need filings and ownership.
- AI for My BusinessPaste a company URL and get the jobs AI can do for it, graded, with the tools that do each one. Use it when the question is where to start, not which vendor to buy.
- Team Fit JobsRank small-startup roles by how likely a hire is, using public LinkedIn signals. Use it when you are choosing where to apply, not browsing every board.
- New DomainsFreshly registered .ai, .io, .dev, .so, .sh, .security and .si domains that already have a live site, checked every minute. Use it to spot a company before it announces.
- Domain RadarAlerts, a feed or API access for new .ai, .io and .security domains that match your keywords and have a live site. Use it when you want new companies sent to you, not searched for.
YouTube and video
4 tools
- Article to YouTubeTurn an article URL into a narrated explainer with captions. Use it when a post should also exist as a video without a separate production pass.
- YouTube to Blog PostPaste a public video and get a structured post in HTML, Markdown, and JSON-LD, with the embed kept. Use it to turn a talk into a page you can rank.
- YouTube to ClipsPick the moments worth posting from a captioned video, with timestamps and copy. Use it when you need Shorts or quote cards, not a full rewrite.
- YouTube TranscriptPull the full spoken text of a public video as clean paragraphs. Use it to quote, search, or repurpose a talk without rewatching it.
Writing and publishing
4 tools
- Article DistributionSend a finished article to the accounts you connect. Use it when you already know where the post should go.
- Humanize AI TextRewrite a draft so the rhythm reads like a person wrote it, with a word-level diff. Use it on a paragraph that sounds templated, not to hide a source.
- Visual TL;DRGenerate a diagram and a short summary from an article URL. Use it when a long piece needs a scannable picture of the argument.
- PDF MakerCombine images into a single PDF in the browser. Use it for a one-off packet without uploading the files.
Feeds and automation
2 tools
- RSS Feed GeneratorBuild a feed for a site that never published one. Use it when a newsletter or automation needs a source URL that does not exist yet.
- RSS for Zapier, Make, n8nTurn any site into a trigger those tools can poll. Use it when a company blog has no feed and a workflow still needs new posts.
APIs and agents
2 tools
- Developer APIQuery startups, investors, rounds, email, and agent readiness over REST. Use it when a spreadsheet or an agent needs the directory, not a browser.
- MCP ServerThe same catalogue as tools inside Claude, Cursor, Windsurf, and Claude Code. Point an agent at the server card and it can search and enrich without a custom client.
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