What Clearbit Connect was
Clearbit Connect was a free extension for Gmail and Outlook. When you read an email, it showed information about the sender, such as their role and company.
After HubSpot acquired Clearbit, Clearbit Connect was discontinued. It stopped working on 30 April 2025.
What SenderFinder does
Open an email in Gmail. The browser's side panel shows that person's LinkedIn profile: name, headline, company, location and a link to the profile. Other people in the thread are listed below, and you can look them up with a click.
Outlook on the web is supported on a best-effort basis.
What is different
- Open source. The code is on GitHub under the AGPL-3.0 license. You can read exactly what it does.
- Your own keys. The extension calls data providers directly from your browser, using keys you paste into its settings. Supported: Monid and treg, with Firecrawl as an optional fallback.
- No signup. Lookups go directly from your browser to the provider you configure; there is no SenderFinder server in the lookup path. Anonymous daily usage counts are on by default and can be switched off in settings.
- No CRM lock-in. Results stay in your browser. You can export history as JSON or CSV and take it wherever you like.
- Predictable cost. The cheapest source is tried first, and the chain stops at the first match. A per-lookup cap and a daily cap keep spending in check. Results are cached, so an address is never paid for twice.
Honest limitations
- You need a provider key. One key from Monid or treg is enough to start, but you have to create it yourself.
- It isn't free per lookup. A successful lookup typically costs between $0.0005 and $0.03, usually well under a cent. Misses on most providers are free.
- No Firefox yet. It runs in Chrome. Desktop mail apps such as Apple Mail and Outlook for desktop are not supported.
- Results depend on provider coverage. Some people won't be found. When a provider's name doesn't match the name in the email, the result says “uncertain” and shows both.
Where the data goes
Clearbit Connect was a hosted service: lookups ran on Clearbit's servers and you signed in with a Clearbit account.
SenderFinder is an open-source Chrome extension. Lookup requests go directly from your browser to the data provider you configure; there is no SenderFinder server in the lookup path. A separate statistics service receives one anonymous daily summary, on by default and switchable off in the settings page. The data controller for those statistics is Tony Li, maintainer of astonysh/SenderFinder. For privacy requests, contact tony@senderfinder.com.
The privacy statement lists exactly what is sent, what is kept and what is discarded.
Switching takes a few minutes
- Install the extension. Until the Chrome Web Store listing is live, install it from source.
- Create an API key at Monid or treg.
- Paste it into the extension's settings and open an email in Gmail.
Questions about data? Read the privacy statement. Looking for the older tool? See the Rapportive alternative page.
Read the 50-address benchmark: hit rate and price per provider
