# Apollo

> Contact database + outbound sequences

Source: https://aistack.sh/tool/apollo
Category: Outbound and inbox
Site: https://apollo.io
Status: active
Last verified by a human: 2026-05-06

275M contacts, sequencing, and dialer. Where most cold outbound stacks source leads.

## Pricing

As published on the tool page: Free · $49/seat/mo Basic · $79/seat/mo Professional (annual billing)

## Alternatives

- Clay — https://aistack.sh/tool/clay

## Head-to-head comparisons

- [Apollo vs Clay](https://aistack.sh/compare/apollo-vs-clay) (markdown: https://aistack.sh/compare/apollo-vs-clay/llms.txt)
- [Apollo vs HubSpot](https://aistack.sh/compare/apollo-vs-hubspot) (markdown: https://aistack.sh/compare/apollo-vs-hubspot/llms.txt)
- [Apollo vs Smartlead](https://aistack.sh/compare/apollo-vs-smartlead) (markdown: https://aistack.sh/compare/apollo-vs-smartlead/llms.txt)

## Used in 2 tested stacks

- [Cold outbound](https://aistack.sh/stack/cold-outbound) — Lead source, $342/mo
- [Cold outbound (solo)](https://aistack.sh/stack/cold-outbound-lite) — Lead source + light enrichment, $75/mo

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From aistack.sh. Last updated 2026-05-06.