Leadsario

Free plan APIExtensionWeb

What Leadsario is

Leadsario is a B2B prospecting platform for finding and verifying professional contact details and building lead lists. Its search engine covers more than 500 million contacts. For enrichment, users can upload a CSV with first name, last name, and company domain to receive verified emails and confidence scores; lists of up to 10,000 rows are typically processed within minutes. Email verification uses seven tiers, including MX checks, SMTP handshake verification, and catch-all detection. The Chrome extension captures emails, phone numbers, and company information on LinkedIn, company websites, and Google Maps, processing up to 25 LinkedIn profiles per page. Other options include bulk search, a REST API, CSV export, and native integrations with HubSpot, Salesforce, Pipedrive, Outreach, Lemlist, and Apollo. The free tier costs nothing and includes 50 email lookups per month, the Chrome Extension, and Email Verifier. Leadsario says it surfaces publicly available business contact information, provides data subject request tools, and hosts infrastructure in EU data centers.

Who it suits

Leadsario suits sales teams building prospect lists, enriching contact records, and sharing pooled leads and credits in team workspaces. It may suit users who want to prospect through a browser extension or API.

What it does well

Searches a database of more than 500 million contacts
Enriches CSV lists with verified emails and confidence scores
Chrome extension captures contact and company details
Offers a REST API and CSV export
Free tier includes 50 monthly email lookups

What to know first

Free tier is limited to 50 email lookups monthly
Bulk LinkedIn processing is capped at 25 profiles per page
Firefox is in beta
Safari is on the roadmap

Plans

Plan	Billed and limits	Price
Free tier	50 email lookups per month · Chrome Extension · Email Verifier	Free

As leadsario.com lists them, read 8 Oct 2026. The maker's own page has the final word.

Verdict

Leadsario combines contact search, verification, CSV enrichment, and extension-based capture. Its free tier has a monthly lookup cap, and browser support varies by browser.

Facts from Leadsario's own pages

Browser extension: The Chrome Extension captures emails, phone numbers, and company data while browsing LinkedIn, company websites, and Google Maps. · leadsario.com, 8 Oct 2026
Bulk enrichment: Users can upload a CSV with first name, last name, and company domain to receive enriched results with verified emails and confidence scores; the site says lists up to 10,000 rows are typically processed within minutes. · leadsario.com, 8 Oct 2026
Contact database: The site says its engine searches a database of more than 500 million contacts. · leadsario.com, 8 Oct 2026
Email verification: Leadsario says it uses a seven-tier verification process that includes MX record checks, SMTP handshake verification, and catch-all detection. · leadsario.com, 8 Oct 2026
Extension browsing data: The extension page says it activates on pages where users explicitly use it and does not track general browsing history or collect visited URLs. · leadsario.com, 8 Oct 2026
Extension limits: The extension can process LinkedIn search results in bulk at up to 25 profiles per page. · leadsario.com, 8 Oct 2026
Integrations: The homepage lists native integrations with HubSpot, Salesforce, Pipedrive, Outreach, Lemlist, and Apollo, plus CSV export and a REST API. · leadsario.com, 8 Oct 2026
Security and privacy: The homepage says Leadsario is GDPR compliant, surfaces publicly available business contact information, provides data subject request tools, and hosts its infrastructure in EU data centers. · leadsario.com, 8 Oct 2026
Supported browsers: The extension page lists Google Chrome and Chromium-based browsers including Edge, Brave, and Arc; it says Firefox is in beta and Safari is on the roadmap for Q3 2026. · leadsario.com, 8 Oct 2026
What it does: Leadsario describes itself as a B2B lead generation platform for finding and verifying professional contact information and building prospect lists. · leadsario.com, 8 Oct 2026
Who it serves: The site presents Leadsario as a prospecting tool for sales teams and describes team workspaces with pooled leads and centrally managed shared credits. · leadsario.com, 8 Oct 2026

Where Leadsario stands on Freedom251

Email Finder Software#16 of 33