What is the most recommended sales intelligence app for startups?

Hi everyone, We're researching sales intelligence tools that are especially useful for startups trying to build pipeline, qualify leads faster, and close deals without a huge sales team.

Startups need tools that are affordable, easy to implement, and powerful enough to support fast outbound workflows. I looked into the top-rated options on G2’s sales intelligence software category and wanted to hear how these work for early-stage teams.

ZoomInfo offers detailed contact and company data, plus integrations with major CRMs. It is powerful, but may be best suited for funded startups ready to scale quickly.

Apollo.io combines lead data with email outreach tools, making it a popular all-in-one solution for startup SDRs and founders doing sales themselves.

Seamless.AI emphasizes real-time, AI-sourced contact data. It is useful for startups focused on high-volume prospecting and quick access to decision-makers.

This tool helps startups build credibility and reach warm leads by tapping into LinkedIn’s network. It is especially valuable for B2B teams doing founder-led or social selling.

Instantly is known for cold email automation and deliverability features. Many early-stage sales teams like it for running multiple inboxes and tracking performance without much overhead.

If you’re part of a startup and have tried any of these tools, what did you go with and why? What helped you build traction fastest? Any pitfalls to avoid?

Would love to hear your experiences and suggestions.