B2B sales intelligence and data

Lead411 is a B2B database founded in 2001 that combines verified emails and phone numbers with Bombora buyer-intent data and growth event alerts (funding, hiring, new offices), at an entry price more accessible than most competitors in the category.

Spark plan from $49/month (1,000 exports/month, no API) or $490/year. Ignite plan from $150/month with API access and more exports, from $1,500/year. Blaze plan with unlimited exports and custom pricing. Bombora intent data is included at no extra cost only with annual billing. There's also an alternative Basic plan from $99/user/month with a three-month minimum commitment.

Seamless.AI is a B2B prospecting platform that searches for emails and phone numbers in real time (rather than serving them from a static database) and adds an AI assistant for drafting outreach messages, with an extremely high G2 rating but a reputation badly damaged on Trustpilot over its billing and cancellation practices.

Free plan with 50 credits (email and phone combined), no credit card required. Paid Pro plans start around $79-147/month depending on source and contracted credit volume, scaling up to $250-300/user/month at higher tiers; additional credits are sold separately. Contracts feature auto-renewal and a cancellation window of up to 60 days.

SalesIntel is a B2B sales intelligence platform that combines human-verified contacts — including more than 54 million mobile numbers — with an on-demand research service and buyer-intent data, all under an entirely quote-based pricing model with annual contracts.

No public pricing: you must request a quote. Third-party estimates put an entry-level plan at around $15,000-24,000/year, mid tiers between $48,000 and $72,000/year, and Enterprise contracts above $100,000/year, always with annual, no monthly billing option.