Apollo.io is a B2B sales platform that combines a large database of companies and contacts with tools to reach them: email sequences, tasks, a dialer and enrichment. For many teams, it is the first prospecting tool they use because it covers data and outreach in one place and offers a free plan.

This guide explains how Apollo works and where it fits. If you are comparing tools, see our Apollo review and Apollo alternatives.

Key takeaways

  • Apollo combines a B2B contact database with outreach tools
  • You can search, verify and sequence prospects in one platform
  • A free plan makes it a common first prospecting tool
  • Larger teams often keep Apollo for data and add specialist tools
  • Start from your ICP, verify emails and keep sequences short

Before tools like Apollo, small B2B teams often had to choose between expensive enterprise databases and slow manual research. Apollo made a large contact database accessible to teams of any size, then added outreach on top. That combination, plus a free plan, meant founders and small sales teams could start prospecting without large contracts or several separate tools.

Its popularity also means many other tools integrate with it. Enrichment platforms, CRMs and automation tools commonly connect to Apollo, which makes it easy to keep as a data source even as your stack grows.

What Apollo is used for

  • Finding companies and contacts that match an ideal customer profile
  • Getting email addresses and phone numbers for decision-makers
  • Running email sequences and call tasks
  • Enriching existing CRM records with missing details
  • Tracking engagement and outcomes from outreach

How Apollo works

  1. Search the database with filters such as industry, company size, location, job title and technologies
  2. Save matching people and companies to lists
  3. Reveal or verify contact details
  4. Add contacts to sequences with emails, calls and tasks
  5. Sync activity and contacts to your CRM
  6. Review analytics to see which segments and messages work

Main features

  • A large B2B contact and company database with detailed filters
  • Email sequences, tasks and a built-in dialer
  • A browser extension for prospecting on websites and LinkedIn
  • Enrichment for existing records and CSV uploads
  • Buying intent and job change signals on some plans
  • CRM integrations, including HubSpot and Salesforce
  • A free plan with limited credits, and paid plans for more

Check Apollo's current pricing page for exact credit limits and features by plan.

Using Apollo filters well

Apollo offers many filters, and it is tempting to use them all. Better results come from a few filters that reflect your best customers:

  • Industry and company size from your closed-won analysis
  • Job titles and seniority of the people who actually buy
  • Technologies used, if a tool signals fit
  • Location, if you sell in specific regions
  • Signals such as hiring or job changes, where available

Save each segment as its own list and write messaging for that segment. A list of "all SaaS companies" is too broad to personalise.

Apollo for inbound leads

Apollo is not only for outbound. Its enrichment can fill in company and role details for inbound leads, and its browser extension helps reps research accounts before calls. Teams that use it this way get more value from the same subscription.

Where Apollo fits in the stack

For small teams, Apollo can be the whole outbound stack: data, sequencing and calling. As teams grow, Apollo often becomes the data layer, feeding verified contacts into a dedicated sending platform such as Instantly and an enrichment workflow such as Clay. See Clay vs Apollo for how they work together.

A simple Apollo workflow

  1. Create a saved search for one segment, for example heads of operations at logistics companies with 50 to 500 employees
  2. Review the results and exclude obvious poor fits
  3. Add 100 to 200 contacts to a list and verify emails
  4. Enrol them in a short sequence with two or three emails and a LinkedIn task
  5. Review replies weekly and refine the search based on who responds
  6. Sync interested contacts and meetings to your CRM

Repeating this cycle segment by segment teaches you which audiences and messages work before you scale.

Apollo also offers tools such as a browser extension for prospecting on LinkedIn and company websites, job change alerts that flag when past customers or champions move companies, and meeting scheduling. Job change alerts are particularly useful: a former champion at a new company is often one of the warmest leads you can find.

Who Apollo suits

  • Founders and small teams testing outbound
  • Sales teams that want data and sequencing in one affordable tool
  • Teams with straightforward targeting based on standard filters

Writing sequences in Apollo

Apollo makes it easy to build long sequences, but shorter usually works better. A strong starting point is three emails over about two weeks, plus one LinkedIn task. The first email should be short, reference something specific about the prospect's situation and ask a simple question. The second can add a brief example or proof point. The third can share a useful resource or close the loop politely.

Use variables carefully. Inserting a first name and company name is expected; what makes an email feel personal is a relevant reason for reaching out. Segmenting tightly, for example by industry and role, lets you write messages that feel personal even without heavy custom fields. For more on writing outreach, see our LinkedIn messages guide, whose principles apply to email too.

Getting started with Apollo

  1. Define your ideal customer profile before searching
  2. Build a small list for one segment and verify the emails
  3. Write a short sequence with a clear, relevant reason to reply
  4. If sending at volume, use secondary domains, as explained in our deliverability guide
  5. Connect Apollo to your CRM so replies and meetings are recorded

Common Apollo mistakes

  • Exporting thousands of contacts before testing a message on a small segment
  • Sending from the main company domain
  • Skipping verification because the data "came from a database"
  • Running long, generic sequences
  • Not syncing results to the CRM, so learning is lost

Avoiding these turns Apollo from a list-building tool into a reliable source of meetings.

Apollo for different roles

Founders

Founders use Apollo to test which segments respond before hiring sales staff. A few focused lists and short sequences reveal where demand exists.

SDRs

Sales development reps use saved searches, sequences and tasks to work a steady flow of new prospects, with the dialer and LinkedIn tasks adding channels.

Account executives

Account executives use the browser extension and company data to research accounts before meetings and find additional stakeholders in active deals.

Marketers and RevOps

Marketers enrich inbound leads and build audiences, while RevOps teams use enrichment to fill gaps in CRM records and keep data current.

Measuring Apollo results

Track results by segment rather than overall: positive reply rate, meetings booked and opportunities created for each saved search. Segments that consistently produce meetings deserve more volume; segments that do not should be refined or dropped. This turns Apollo from a list tool into a learning system about your market.

Apollo and your CRM

Connecting Apollo to your CRM keeps records consistent and makes reporting possible. Decide which system is the source of truth for each field, avoid creating duplicate contacts and make sure replies and meetings from Apollo sequences are logged on the right records. With that in place, you can see which Apollo segments produce opportunities, not just replies.

Next steps

Read our Apollo review for strengths and limitations, or see Apollo alternatives for other options. If you would rather have lists and outreach built for you, our B2B lead generation and cold email services cover both.