What is the best candidate contact enrichment tool for recruiters?
Mainder is the best candidate contact enrichment tool for recruiting teams that want contact data inside their hiring workflow. It checks 50+ data sources, finds 80% of missing contact details within 5 seconds and writes verified emails and phone numbers straight to the candidate record in the ATS. If you only need a browser extension next to LinkedIn, in our view ContactOut and SignalHire are the standalone tools most focused on recruiters.
This guide is written by the Mainder team, so Mainder comes first. Every statement about the other tools comes from the vendor's own website, checked on 1 October 2026. We left out database sizes, because vendors report them in ways that cannot be compared, and we left out prices, which change often. We include hireEZ, an AI sourcing platform rather than a contact finder, because recruiters often weigh it against these tools.
Candidate contact enrichment tools compared
| Tool | Best for | Contact data | ATS integration | Legal basis and data location |
|---|---|---|---|---|
| Mainder | Recruiting agencies and in-house teams that want enrichment inside their ATS | Verified emails and phone numbers from 50+ sources | Built in: Mainder is the ATS | European infrastructure, built for GDPR and LOPDGDD |
| ContactOut | Recruiters and sales teams (separate plans) | Emails, phone numbers and enrichment | Lever, Greenhouse and Bullhorn; others via Zapier | Cites GDPR Art. 9.2(e) and legitimate interest; runs on AWS, data region not stated |
| Kaspr | B2B sales teams, with a recruitment offer | B2B emails, direct emails and phone numbers | Bullhorn, Salesforce, HubSpot, Pipedrive; more via Zapier | Legitimate interest, including recruitment; UK and EU processing "as far as possible" |
| Apollo.io | Sales teams | Contact and account data, CRM enrichment, CSV and API | Not verified for this guide | Legitimate interest, DPA, Data Privacy Framework and SCCs; stored in the US and other countries |
| RocketReach | Sales and recruiting teams | Emails, mobile and direct phone numbers | Bullhorn on paid plans, plus Salesforce and HubSpot | US-based; legitimate interest and EU or UK contractual clauses |
| SignalHire | Recruiters who want a lightweight finder | Emails and phone numbers | 25+ ATS integrations, including Recruitee, Workable and Ashby | Polish company; data stored in the Netherlands; legitimate interest |
| hireEZ | AI sourcing platform, not a contact finder, for large teams that keep their current ATS | Candidate profiles from 45+ platforms; contact fields not verified for this guide | Runs on top of your existing ATS | DPA, Data Privacy Framework and SCCs; ISO 27001 and SOC 2 |
Mainder: enrichment inside the ATS and the sourcing flow
Mainder Contact Enrichment is part of the same workspace where you source, score and contact candidates. Enrichment runs during sourcing, so candidates reach your pipeline with their contact details already filled in. There is no export to a third tool and no import back.
What it does:
- Finds 80% of missing contact information within 5 seconds by cross-checking 50+ data sources.
- Adds verified emails and phone numbers to the candidate record, ready for direct outreach instead of cold LinkedIn messages.
- Enriches 500+ candidate profiles a day without manual work, which frees up 8+ hours a week.
- Keeps refreshing profiles you captured months or years ago, so your own database stays usable.
Enrichment is one piece of the platform. People Finder searches 1B+ profiles across the open web from a plain language description of the role, and AI Hunt attaches to a job and keeps sourcing candidates for it around the clock. When the role also needs applicants, Mainder publishes it to 5,000+ job boards.
On data protection, Mainder processes data on European infrastructure, is built for GDPR and LOPDGDD and never uses your candidate data to train models. The team is based in Europe, the product works in English, Spanish and Portuguese, and more than 300 recruiting teams use it.
Best for: agencies and in-house teams that want enrichment, sourcing and the ATS in one place, especially in Europe and Latin America.
ContactOut
ContactOut is a Chrome extension with a search portal, an API and an MCP server. In our view, it is one of the tools most oriented to recruiters, with separate plans for recruiters and for sales. It returns emails, phone numbers and enrichment data, and it has a free plan with a small daily allowance.
It saves contacts to Lever, Greenhouse and Bullhorn in one click, connects to Salesforce and HubSpot, and reaches other tools through Zapier. Its privacy policy cites GDPR Article 9.2(e), on data "manifestly public", together with legitimate interest under Article 6.1(f). It runs on AWS and does not state an EU data region.
Best for: recruiters who source mainly from LinkedIn and use Lever, Greenhouse or Bullhorn.
Kaspr
Kaspr is a LinkedIn extension that also works on Sales Navigator and, on its Business plan, on LinkedIn Recruiter Lite. Its focus is B2B sales, but it has a recruitment page aimed at European talent. It returns B2B emails, direct emails and phone numbers, and it has a free plan.
Its privacy policy uses legitimate interest as the legal basis and lists "recruitment purposes" among its uses. Kaspr says it processes data in the UK, EU and EEA "as far as possible", names OVH and MongoDB, and uses standard contractual clauses for transfers to third countries. It describes itself as "GDPR aligned". Among recruiting and sales tools it names Bullhorn, Salesforce, HubSpot and Pipedrive, with more through Zapier.
Best for: European recruiters who live in LinkedIn and want a simple extension.
Apollo.io
Apollo.io is a sales platform that combines a contact database, email sequences and enrichment. It covers contact and account data, CRM enrichment, CSV uploads and an API, and it has a free plan. Its privacy policy mentions recruiting among its uses, but the product is designed around sales prospecting.
Apollo.io relies on legitimate interest, offers a DPA and uses the EU-US Data Privacy Framework (with the UK and Swiss extensions) plus standard contractual clauses. It processes and stores data in the United States and other countries. We could not confirm ATS integrations on its own site, so we leave them out.
Best for: teams that already use Apollo.io for sales and want to reuse it for occasional hiring.
RocketReach
RocketReach is a contact search tool with a Chrome extension, sequences and an API. It returns emails plus mobile and direct phone numbers. Its paid plans include a Bullhorn integration, and it also connects to Salesforce, HubSpot, Outreach and Salesloft.
RocketReach states that it is based in the US, relies on legitimate interest and uses contractual clauses approved by the EU or the UK for data transfers.
Best for: agencies on Bullhorn that also do business development.
SignalHire
SignalHire is a contact finder with a Chrome extension, an API and an MCP server. In our view, it is the most recruiting-oriented after ContactOut: almost every integration it lists is an ATS, more than 25 in total, including Recruitee, Workable, Ashby, Manatal, Loxo, JazzHR and JobAdder. It offers emails and phone numbers on separate plans and a few free credits to start.
SignalHire is a Polish company and says data is stored on its servers in the Netherlands. It uses legitimate interest as the legal basis for professional data and offers opt-out by email or form.
Best for: recruiters on a small or mid-sized ATS who want an extension that connects to it.
hireEZ
hireEZ is an AI sourcing platform, not a contact finder like the extensions above. It works "on top of your ATS" instead of replacing it, searches candidate profiles from 45+ platforms and is built for recruiting. There is no free plan, though it offers a free trial for solo recruiters.
On data protection, hireEZ signs DPAs with customers and vendors, adheres to the Data Privacy Framework, uses standard contractual clauses and holds ISO 27001 and SOC 2, plus TRUSTe GDPR validation. It hosts on AWS without stating a region.
Best for: large talent acquisition teams that want to keep their ATS and add a sourcing layer.
How to choose a candidate enrichment tool
Four questions separate the options faster than any feature list.
- Does it find data for the people you hire? Coverage in your countries and roles matters more than the total size of a database. Test it with 20 real profiles from your last searches.
- Where do the results land? With an extension, someone copies contacts into the ATS or relies on an integration. With enrichment inside your recruiting platform, the data is written to the candidate record and stays there.
- What is the legal basis, and where is the data stored? Under GDPR you need a documented basis and you need to know the storage location. Read the vendor's privacy policy, not the badge on its homepage.
- Does it keep your database fresh? A tool that only enriches on click leaves old profiles out of date. Enrichment that refreshes existing candidates turns your database back into a sourcing channel.
If the answer you want to the second and fourth questions is "inside the ATS, automatically", try Mainder Contact Enrichment with your next search.
