Ampliz vs Seamless.AI: Which B2B Data Tool Is Worth It?
This comparison shouldn't exist. Ampliz and Seamless.AI serve fundamentally different markets - one's a vertical healthcare and APAC data provider, the other's a horizontal US-focused prospecting engine. Comparing them is like comparing a scalpel to a chainsaw. Both cut, but you'd better know what you're cutting.
Yet people search "Ampliz vs Seamless.AI" because they're stuck choosing between two tools that each do one thing well and several things poorly. Let's sort it out.
30-Second Verdict
Ampliz wins if you're prospecting into US healthcare (HCPs, hospitals) or APAC B2B markets. Nothing else comes close in that niche.
Seamless.AI wins if you need the largest raw US contact database with phone numbers and can stomach opaque pricing plus aggressive contract terms.
What Each Tool Actually Does
Ampliz is a vertical data provider laser-focused on US healthcare and APAC B2B. Its healthcare database covers 5,384,164 HCPs, 8,203 hospitals, and 10M executive contacts. On the APAC side, it offers 400M+ B2B contacts across 16 countries, plus a Chrome extension (SalesBuddy) for on-page prospecting. A Reddit thread mapping vertical GTM providers pegged Ampliz at roughly $29M in revenue - small but meaningful for a niche player. Outside healthcare and APAC, coverage drops off fast.
Seamless.AI is a horizontal prospecting engine built for volume. The database runs 1.7-1.9B contacts, 422M+ phone numbers, and 150M company profiles - overwhelmingly US-focused. Over 1M users have signed up, and the interface is genuinely fast for contact discovery. The scale is impressive. The accuracy and pricing transparency? Not so much.
Pricing Compared
Seamless.AI still won't publish pricing in 2026. Here's what user reports and third-party breakdowns reveal:
| Ampliz | Seamless.AI | Prospeo | |
|---|---|---|---|
| Free tier | $0 (10 credits) | $0 (50 credits) | $0 (75 emails + 100 Chrome credits/mo) |
| Entry paid | $50/mo (100 credits) | ~$79/user/mo (1,000 credits) | ~$0.01/email |
| Annual plan | $480/yr (20% off) | ~$147/mo billed annually | Self-serve tiers |
| Enterprise | Custom (healthcare) | $149/user/mo (5-user min = $745/mo floor) | No minimum |
| Pricing visible? | Yes | No | Yes |
| Contracts | No | Annual (auto-renewal) | No |
Seamless.AI's add-ons for intent data and automation can inflate costs 40-60% above the base license. That $79/mo Pro plan becomes $128/month with one extra 500-credit pack at $49.
Seamless.AI markets 98% accuracy but users report 85%. Ampliz has almost no independent validation. Prospeo delivers 98% verified email accuracy across 300M+ profiles - backed by a proprietary 5-step verification process, not vendor claims. Data refreshes every 7 days, not whenever they get around to it.
See what real 98% accuracy looks like - free tier, no credit card.
Data Quality and Accuracy
| Metric | Ampliz | Seamless.AI |
|---|---|---|
| Database size | 400M+ (APAC focus) | 1.7-1.9B (US focus) |
| Email accuracy | 95%+ (vendor claim) | ~85% (user-reported) |
| Phone accuracy | Not published | ~60% (user-reported) |
| Data refresh | Not published | Not published |
| G2 rating | 4.2/5 (7 reviews) | 4.4/5 (5,319 reviews) |
Here's the thing: Seamless.AI markets 98% accuracy, but Reddit users consistently report closer to 85% for emails and roughly 60% for phone numbers. A Skrapp breakdown cites 20-30% bounce rates and job-title mismatches at scale - a domain reputation killer if you're running outbound at volume. In early 2025, LinkedIn removed Seamless.AI's company page over data scraping violations, which doesn't inspire confidence in their sourcing practices.
Ampliz claims 95%+ for healthcare data, but with only 7 G2 reviews (and a 4.5/5 on Capterra from 2 reviews), there's almost no independent validation. The healthcare-specific filtering is genuinely useful. You're just mostly trusting the vendor.
If your average deal size is under $15k and you're not selling into healthcare, neither of these tools is worth the friction. We've seen teams get better ROI from a transparent, self-serve platform with verified data than from fighting Seamless.AI's contract terms or hoping Ampliz covers their market.
What Users Actually Say
Ampliz earns praise for healthcare-specific filters that actually work - finding surgeons, pharmacists, and dentists by specialty - and for delivering fewer bounces than expected from a niche tool. The downsides are real, though. One Capterra reviewer called the UI "shabby," and coverage gaps for smaller companies and non-healthcare verticals come up repeatedly.
Seamless.AI users love the speed of contact discovery and strong CRM integrations with Salesforce, HubSpot, and Salesloft. But the #1 complaint across review platforms is cancellation nightmares - auto-renewing annual contracts that are genuinely difficult to exit. Credits burn fast, extra packs aren't cheap, and the gap between marketed accuracy and real-world results frustrates people. The consensus on r/sales threads is blunt: great database, terrible business practices.
The review volume disparity tells its own story. 5,319 G2 reviews for Seamless.AI versus 7 for Ampliz. That doesn't mean Seamless is better - it means you can actually validate their claims through independent feedback.
Better Alternatives for General Prospecting
If you don't need healthcare-specific data or Seamless.AI's massive phone database, neither tool is optimized for general B2B email prospecting. If you're building lists at scale, start with a broader view of B2B leads database providers before you commit.
Apollo.io (~$49/mo, generous free tier) is another option Reddit users consistently recommend over Seamless.AI for pricing transparency and a solid all-in-one workflow.
For teams already deep in a CRM ecosystem, ZoomInfo remains the enterprise standard - but expect $15k+ annually and a long sales cycle to get started.
If your main pain is bounces, add an email verifier before you scale sends, and keep an eye on cold email analytics so you catch deliverability issues early.
Between Seamless.AI's hidden pricing and auto-renewal traps and Ampliz's narrow coverage, neither tool respects your budget or your time. Prospeo costs ~$0.01/email with fully transparent pricing, no contracts, and no sales calls required. Teams using Prospeo book 35% more meetings than Apollo users and 26% more than ZoomInfo.
Skip the contract traps. Get verified data at a price you can actually see.
FAQ
Is Ampliz only for healthcare?
Not exclusively, but its strongest data covers US healthcare professionals (5,384,164 HCPs) and APAC B2B contacts. G2 reviewers highlight coverage gaps outside healthcare and APAC, especially for smaller companies and non-medical roles. If you're selling SaaS to mid-market tech companies, Ampliz isn't built for you.
Why doesn't Seamless.AI publish pricing?
Seamless.AI requires a sales call for paid plans. User-reported pricing puts Pro at ~$79/user/month with 1,000 credits. Add-ons inflate costs 40-60%, and auto-renewal contracts make cancellation difficult - the single most common complaint in reviews.
What's a good alternative to both tools?
For general B2B prospecting without healthcare or APAC requirements, Prospeo offers 98% email accuracy, 300M+ profiles, and a free tier (75 emails/month) with no contracts. Apollo.io is another solid self-serve option with transparent pricing and a large community. The right pick depends on whether you value email accuracy, phone numbers, or workflow integrations most.