Bytemine vs SignalHire: Which Contact Data Tool Is Worth Your Budget?
B2B contact data decays at roughly 2.1% per month. That's a quarter of your database going stale every year. When you're weighing Bytemine vs SignalHire, you're making a pipeline decision, not a tooling decision - and the wrong call costs you months of wasted outreach before you even notice the damage.
One heads-up: if you search for "Bytemine," you'll find a trading platform and a German IT firm. We're talking about Bytemine.ai, the contact data API. Different company entirely.
30-Second Verdict
Bytemine wins if you need API-first enrichment with transparent per-credit pricing and no annual lock-in.
SignalHire wins if you want a polished Chrome extension for quick individual lookups on professional profiles.
Skip both if email accuracy and data freshness are your top priorities. There are tools delivering 98% email accuracy on a 7-day refresh cycle that neither of these can match.
Feature Comparison
| Bytemine | SignalHire | |
|---|---|---|
| Database / coverage | 80M+ mobile numbers, 70M+ work emails, 100M+ personal emails | 850M+ profiles |
| Email accuracy | 95% (self-reported) | 95-96% / 3-5% bounce claim |
| Starting price | $50/mo (1,000 credits) | $57/mo (Emails, billed annually) |
| Free tier | Yes (free plan with real data) | 5 credits/mo (10 with extension) |
| API access | Full API access | Webhook-based API (7-10s response) |
| Chrome extension | Not a core feature (API-first) | Chrome + Firefox |
| G2 rating | None | 3.7/5 (56 reviews) |
| Integrations | Clay, Apollo, HighLevel | ATS/CRM integration |
Note the apples-to-oranges problem here: Bytemine's numbers are contact-data coverage (mobiles + emails), while SignalHire's 850M figure is profiles. A bigger profile count doesn't mean more accurate data.
Bytemine: API-First, Lean on Social Proof
Use this if you're building enrichment workflows via API and want predictable, per-credit pricing. The database covers 80M+ mobile numbers, 70M+ work emails, and 100M+ personal emails. Starting at $50/mo for 1,000 credits ($0.05/contact), volume discounts push costs toward $0.02. Unlimited users, full API access, no seat-based pricing - that's a clean deal for dev-heavy teams.
The single Datarade review praises the clean API, quick setup, and responsive support. Encouraging, but it's one review.
Skip this if you need social proof. Zero G2 or Capterra presence for the contact data product means procurement teams will push back, and you'll spend cycles justifying the choice internally.
Bytemine's API is clean but unproven. SignalHire's extension is slick but stale at scale. Prospeo gives you both - 300M+ profiles, full API with 92% match rate, and a Chrome extension used by 40,000+ people - backed by 98% email accuracy and 125M+ verified mobiles at $0.01/email.
Run the bake-off. Let your bounce rate pick the winner.
SignalHire: Great Extension, Shaky at Scale
SignalHire's Chrome and Firefox extensions are genuinely well-built. G2 reviewers consistently praise the speed of contact discovery, and the company offers 7-days-a-week human support via live chat, email, and phone - a real differentiator for teams that need hand-holding during onboarding.
Here's where it falls apart for scale use cases. The API is webhook-based with 7-10 second response times and no preview endpoint. Credits burn fast, upgrades get expensive, and the "Unlimited Package" is limited to 5,000 credits/month under fair usage - a detail buried in a tooltip on their pricing page. G2 reviewers also flag stale and incorrect data as a recurring issue, which tracks with what we've seen across tools that don't refresh on a tight cycle.
Here's the thing: SignalHire is a great browser tool trapped inside a mediocre data platform. If you only need 50-100 lookups a week, it's solid. The moment you try to scale beyond that, the pricing and API limitations will frustrate you.
Pricing Breakdown
| Volume | Bytemine | SignalHire |
|---|---|---|
| 1,000 contacts/mo | ~$50 (1,000 credits, ~$0.05/ea) | $57 (emails only) / $167 (email+phone) |
| 5,000 contacts/mo | ~$100-150 (volume discount) | Hits fair-usage limit - contact sales |
At low volume, the email-only plans are close. But the moment you need phone numbers, SignalHire jumps to $167/mo. At 5,000 contacts/month, you're bumping against that fair-usage ceiling and negotiating custom pricing. In our experience, "contact sales" at this stage usually means a 2-3x price jump with an annual commitment attached. Bytemine's volume discounts are far more predictable.
Which One Should You Pick?
For API-first enrichment at scale, go with Bytemine. Transparent pricing, clean API, no per-seat fees.
For individual prospecting via browser extension, SignalHire is the better pick. The extension UX is its strongest asset by a wide margin.
For accuracy and freshness above all - neither. Both self-report 95%+, but neither has independently verified those numbers. Run a bake-off with a third option and let your bounce rate decide.
We've run bake-offs where the tool with the biggest database had the worst deliverability. Database size is a vanity metric. Bounce rate is the truth - and phone numbers go stale at roughly 18% per year, so freshness matters even more for mobile data.
A Third Option Worth Testing
If neither Bytemine nor SignalHire wins your evaluation, Prospeo deserves a seat at the table. It delivers 98% email accuracy on a 7-day refresh cycle, 125M+ verified mobiles with a 30% pickup rate, and 300M+ profiles with 30+ search filters including Bombora-powered buyer intent. GDPR compliant, self-serve, no contracts.
Where both Bytemine and SignalHire self-report 95% accuracy without independent verification, Prospeo's 5-step verification process - including catch-all handling, spam-trap removal, and honeypot filtering - backs up that 98% claim with proprietary infrastructure that doesn't rely on third-party email providers. The 7-day data refresh cycle, compared to the 6-week industry average, means noticeably fewer bounces in real campaigns. One customer, Snyk, saw bounce rates drop from 35-40% to under 5% after switching, with AE-sourced pipeline up 180%.
The free tier gives you 75 verified emails and 100 Chrome extension credits per month - enough to run a legitimate head-to-head test.
Data decays 2.1% per month, and neither Bytemine nor SignalHire publishes a refresh cycle. Prospeo refreshes every 7 days - 6x faster than the industry average. Snyk dropped bounce rates from 35% to under 5% and grew AE-sourced pipeline 180%.
Stop outreaching stale contacts. Get 75 free verified emails today.
FAQ
Does Bytemine have a free plan?
Yes. Bytemine offers a free plan with real, usable data. Paid plans start at $50/month with no annual commitment, unlimited users, and full API access at every tier.
Is SignalHire's unlimited plan really unlimited?
No. The "Unlimited Package" caps at 5,000 credits/month under fair usage, buried in a tooltip on their pricing page. Beyond that threshold, you're negotiating custom pricing with sales.
Which tool has better phone data?
Bytemine claims 80M+ mobile numbers. SignalHire doesn't break out phone numbers from its 850M profile count, making direct comparison difficult. For teams prioritizing mobile reach, Prospeo's 125M+ verified mobiles with a 30% pickup rate outperforms both on volume and connection quality.
What's a good free alternative to both?
Prospeo's free tier (75 verified emails + 100 Chrome extension credits/month) gives you enough data to run real outbound tests. Bytemine also offers a free plan, while SignalHire limits you to 5-10 free credits - barely enough for a single prospecting session.