Go4Database vs SignalHire: Which B2B Data Tool Is Worth It?
In the Go4Database vs SignalHire matchup, neither tool is going to blow you away. SignalHire has the bigger database and a solid browser extension with workflow features, but G2 reviewers flag outdated data and the "unlimited" package caps at 2,000 credits per month. Go4Database is cheaper on paper, but a 25% email bounce rate from a G2 reviewer's sequence test and almost zero third-party validation make it a risky bet for anyone running real outbound volume.
Quick Comparison Table
| Feature | Go4Database | SignalHire | Prospeo |
|---|---|---|---|
| Database Size | 350-400M (their own pages disagree) | [850M+ profiles](https://www.signalhire.com/) | 300M+ verified |
| Starting Price | $35-$100/mo, billed annually | $39/mo | Free tier, then ~$0.01/email |
| Email Accuracy | 95% per vendor | 95%+ per vendor | 98% |
| Verification | Unknown | Live verification, 7-10 day refresh | 5-step proprietary, 7-day refresh |
Winners by row: SignalHire takes database size. Go4Database takes sticker price. Prospeo takes accuracy and verification - and that's the row that actually protects your sender reputation.
What You Get with Each Tool
Go4Database
Use this if you're on a tight budget and need pre-built industry lists across 9,000+ industries. The Nano plan at $35/mo billed annually gets you 1,500 contacts per month, scaling to $100/mo on the Mega plan.
Skip this if you care about deliverability. One reviewer tested a sequence and saw roughly 25% of emails bounce - that's domain-reputation-destroying territory. Their own marketing pages also conflict on database size: 400M on the homepage, 350M on the About page. Only 5 G2 reviews exist, all from Asia, and there are 4 Trustpilot reviews total. We couldn't find meaningful Reddit discussion about Go4Database either, which is unusual for a tool that's been around since 2012. In our experience, bounce rates that high can tank sender reputation within weeks. Proceed with caution.
SignalHire
Use this if you want a browser extension that works across multiple platforms and built-in email sequences via Outlook/Microsoft 365. The 850M+ profile database is legitimately large, with vendor-stated coverage of up to 90% for emails and 80% for phone numbers. Reviewers consistently praise ease of use and responsive support.
Skip this if you need reliable data at scale. Reviewers flagged outdated or incorrect contact information that wastes credits. One G2 reviewer also called out a webhook-based enrichment setup with 7-10 second responses, which gets painful fast in enrichment workflows.
And here's the kicker: the "Unlimited Package" caps you at 2,000 credits per month under a fair-usage policy. That's roughly 67 credits per day. On G2's pricing snapshot, the "Unlimited Plan" shows at $2,500/year. That's not unlimited. That's marketing.
A 25% bounce rate doesn't just waste credits - it torches your domain. Prospeo's 5-step verification with catch-all handling and spam-trap removal delivers 98% email accuracy on a 7-day refresh cycle. At ~$0.01 per email, you pay less than Go4Database and get data that actually lands.
Stop gambling your sender reputation on unverified data.
Data Quality Decides This Matchup
Both tools claim 95%+ email accuracy with no independent benchmarks to back it up. A reviewer tested Go4Database emails and saw ~25% bounce - roughly 5x what a healthy outbound list should produce. SignalHire publishes a typical 3-5% bounce rate, which is more plausible but still self-reported. If you want a deeper benchmark view, start with email bounce rate and how it impacts list health.
Here's what matters in 2026: with major email providers enforcing SPF, DKIM, and DMARC more aggressively than ever, every bounced email chips away at your domain health. SignalHire refreshes every 7-10 days, which helps. Go4Database doesn't publish a refresh cycle at all. If you need to validate your setup, see DMARC alignment and SPF record example.
Let's be honest - neither tool has much usable community discussion to draw from, so you're basically left with vendor claims plus a small number of reviews. That's a thin foundation for a purchasing decision.
If your average deal size sits below five figures, you probably can't afford the sender reputation damage from a 25% bounce rate. The tool cost is irrelevant if your domain gets throttled. If you're already seeing issues, use this playbook on how to improve sender reputation.
A Stronger Alternative to Both
We've tested a lot of B2B data tools, and the gap between claimed accuracy and real-world deliverability is where most of them fall apart. Prospeo runs 300M+ profiles through a 5-step verification process with catch-all handling, spam-trap removal, and honeypot filtering - that's how it hits 98% email accuracy on a 7-day refresh cycle. You also get 125M+ verified mobile numbers with a 30% pickup rate, intent data tracking 15,000 topics via Bombora, and native integrations with Salesforce, HubSpot, and major outreach tools. It's GDPR compliant, self-serve, and the free tier gives you 75 verified emails per month with no credit card required. If you're comparing vendors broadly, see our roundup of data enrichment services and sales prospecting databases.
Real-world proof: Snyk cut bounce rates from 35-40% to under 5% after switching, and Stack Optimize maintains 94%+ deliverability with zero domain flags across all clients. When comparing Go4Database vs SignalHire, neither can match those numbers. If you're building a full outbound stack, you may also want an SDR tool that fits your workflow.
SignalHire's "unlimited" plan caps at 2,000 credits/month for $2,500/year. Prospeo gives you 300M+ verified profiles, 125M+ mobile numbers with 30% pickup rates, and Bombora intent data across 15,000 topics - self-serve, no contracts, no misleading fine print.
Real unlimited starts with transparent pricing at $0.01 per email.
FAQ
Is Go4Database legit?
Go4Database has operated since 2012 and claims 60,000 customers on its Trustpilot profile. With only 5 G2 reviews, 4 Trustpilot reviews, and a 25% bounce rate in one reviewer's test, there isn't enough independent validation for high-volume outbound. Test deliverability yourself before committing.
Does SignalHire's unlimited plan really have a cap?
Yes. The fair-usage policy caps you at 2,000 credits per month, even on the "unlimited" package - about 67 credits per day. That's roughly $2,500/year for what amounts to a metered plan. Read the fine print.
