Apollo.io
· Free · since 2015
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Apollo.io combines a B2B contact database of 275+ million contacts with built-in email sequencing, dialer, and LinkedIn integration. It's the most popular ZoomInfo alternative because it offers similar data at a fraction of the cost, with outreach tools included.
The free plan gives you 60 mobile credits and 120 export credits per month — enough for a solo founder doing targeted outreach. Paid plans add unlimited emails, A/B testing, and intent data. Apollo has become the default prospecting tool for startups and SMBs that can't justify ZoomInfo's $15K+ annual contracts.
pros
- 275M+ contact database at a fraction of ZoomInfo's price
- Built-in email sequences, dialer, and LinkedIn extension
- Generous free plan with 60 mobile credits/month
- Intent data and job change alerts on paid plans
cons
- Data accuracy is lower than ZoomInfo, especially outside the US
- Email deliverability can suffer if sequences aren't configured carefully
- UI can feel overwhelming with so many features crammed in
- Chrome extension occasionally conflicts with other sales tools
top Apollo.io alternatives
HubSpot CRM Free CRM with marketing, sales, and service tools built in. Free 
Salesforce Enterprise CRM platform with extensive customization, automation, and app ecosystem. $25/user/mo 
Pipedrive Sales-focused CRM with visual pipeline management and simple automation. $14/user/mo 
Close CRM built for inside sales with built-in calling, email sequences, and pipeline management. $49/user/mo more sales tools