So you're shopping for B2B contact data. You've narrowed it down to two options, but you can't pick one.

Here you are.

I'm ready to give you a complete breakdown of each platform. More importantly, I'll show you who each tool is best for and what use cases they excel at.

Both platforms promise accurate emails and phone numbers to fill your pipeline.

But here's the reality: one delivers on verified accuracy with money-back guarantees, while the other offers daily credit refreshes but struggles with bounce rates that can hit 18-23%.

Let's dig in.

Uplead vs Seamless AI: Who is each tool best for?

I went deep in this article. If you read the whole thing, you'll know exactly which platform fits your needs.

But if you want the TLDR, here it is:

• UpLead wins on email accuracy and transparency. You know what you're paying, and you get your money back if emails bounce. Best for teams where deliverability matters more than volume.
  
  

• Seamless.AI wins on daily credit volume and free entry. You can test with 50 free credits monthly, and paid plans give you ~1,000/day. Best for teams that can tolerate data cleanup and want high prospecting volume.
  
  

• FullEnrich wins on coverage. Waterfall enrichment solves what both single-source platforms struggle with—hitting multiple databases until a match is found. Best for international teams or anyone tired of "contact not found" messages eating credits.

Ready to skip ahead? Get 50 free credits and test FullEnrich's waterfall enrichment against your current provider.

UpLead vs Seamless.AI: At a glance comparison

1. Data Quality: Database Coverage & Accuracy

The quality of your contact data directly impacts deliverability, reply rates, and pipeline.

UpLead distinguishes itself with real-time email verification. Every email gets verified at the moment of unlock, with a 95%+ accuracy guarantee. Bounced emails? You get the credit back automatically.

The platform covers 160 million contacts across 200+ countries. Phone numbers are included (direct dials, not company main lines), but the credit-back guarantee only applies to emails, not phone numbers.

Seamless.AI excels with massive scale and daily credit refreshes. Their database claims 1.3 billion contacts and 150 million companies.

The real differentiator is the daily credit model, Pro plans give you ~1,000 credits per day that refresh. Multiple emails per contact are shown with confidence scores, letting you pick the most likely.

However, data accuracy is inconsistent. Users report bounce rates from 18-23% on recent lists.

Both platforms rely on single-source databases. When their source doesn't have accurate contact data, you've spent the credit with nothing to show.

Full Enrich takes a different approach. Waterfall enrichment solves this differently by querying 20+ sources sequentially.

If one provider doesn't have the contact, it checks the next, then the next. You're not locked into one provider's coverage gaps.

FullEnrich reports ~80% average match rates, often higher depending on industry and geography. Credits only get charged when a contact is found—no credit waste on "not found" searches.

👉 Ready to skip ahead? Get 50 free credits and test FullEnrich's waterfall enrichment against your current provider.

Verdict: Who has the best data quality

For North American prospecting with volume: Seamless.AI's daily credit refresh wins if you have the budget and can tolerate cleanup.

For verified email accuracy: UpLead's real-time verification and credit-back guarantee (emails only) deliver better reliability.

For maximum coverage: Full Enrich solves what both single-source platforms struggle with—coverage gaps that waste credits.

2. Pricing & Plans

How you pay for data determines budget predictability and cost control.

UpLead Pricing

UpLead publishes transparent pricing for its core plans:

• Essentials: $99/month (170 credits) or ~$74/month annually (2,040 credits/year)

• Plus: $199/month (400 credits) or ~$149/month annually (4,800 credits/year)

• Professional: Custom pricing (annual only, includes up to 5 users, API access)

Annual plans give you ~25% more credits upfront and let you pool them throughout the year. Monthly plans are use-it-or-lose-it—unused credits don't roll over. One credit unlocks one full contact (verified email + direct dial phone). No separate credit types needed.

👉 To learn more about Uplead pricing

The catch: Phone numbers are included, but the credit-back guarantee only covers emails. If a phone number is wrong or outdated, that credit is spent. Some users on G2 noted surprise at this limitation.

Seamless.AI Pricing

Seamless.AI does not publish pricing. You must go through sales. Based on user reports and third-party sources:

• Free: 50 credits/month (limited features)

• Basic (reported): ~$147/user per month annual contract, ~250 credits/month (3,000/year)

• Pro (reported): ~$1,000 credits per user per day, requires 5-user minimum, annual contract

• Enterprise: Custom (unlimited seats, add-ons like AI Assistant, Intent Data)

Credits refresh daily on Pro plans—a unique model. Unused credits do roll over month-to-month, avoiding waste. However, you must give 60 days' written notice before term end to cancel, or you're locked into auto-renewal. A G2 reviewer described this as "brutal and inflexible."

👉 To learn more about Seamless AI pricing

The hidden costs: AI writing assistant, Buyer Intent, Job Change Alerts, and bulk Data Enrichment are all paid add-ons not included in base pricing. One G2 user mentioned Seamless "changes their pricing frequently and without notice, leaving customers with half the credits they expected."

A Reddit user warned: "I signed up and didn't read the fine print…Apparently I signed a year contract…They wouldn't let me cancel."

FullEnrich Pricing

FullEnrich publishes straightforward pricing:

• Starter: $29/month (500 credits)

• Pro: $55/month (1,000 credits)

• Enterprise: Custom ($400-$50K/month, custom credits)

• Free trial: 50 credits, no credit card required

1 email found = 1 credit. 1 phone found = 10 credits. Credits roll over for 3 months. You're only charged when a contact is successfully found—no credit burn for "not found" results. Unlimited users on all plans.

👉 To learn more about FullEnrich pricing

Verdict:

For budget transparency: UpLead and FullEnrich publish prices. Seamless.AI requires sales conversations with variable quotes.

For credit flexibility: Seamless.AI's daily refresh (Pro) and FullEnrich's 3-month rollover both avoid waste. UpLead's monthly plans don't roll over.

For cost-per-contact: FullEnrich's "only pay when found" model eliminates credit waste on invalid lookups. UpLead refunds email bounces. Seamless.AI has no refund mechanism.

3. UpLead vs Seamless.AI: Top feature comparison

Let's compare the core features side-by-side so you can figure out which platform makes sense for your business.

UpLead focuses on simplicity. You get 50+ search filters, a Chrome extension for LinkedIn/web prospecting, and real-time email verification.

The UI is clean and requires minimal training—one user noted "It is the easiest lead tool." What's missing: no intent data, no org charts, no advanced buyer signals. If your workflow is "search → verify → export," UpLead nails it.

Seamless.AI offers similar search depth but adds Buyer Intent, Job Change Alerts, and AI-powered email writing as paid add-ons.

The Chrome extension is frequently praised for LinkedIn workflow integration. However, features like Autopilot (automated list-building) and bulk enrichment cost extra beyond the base subscription.

FullEnrich takes a different approach entirely. It's not a prospecting search engine—it's an enrichment engine.

You bring your own lead list (CSV, API, or LinkedIn export), and FullEnrich fills in missing emails and phones using waterfall enrichment.

The platform integrates with API, Zapier, Make, Clay, and n8n for workflow automation. No Chrome extension (it was removed), but the API-first design makes it flexible for RevOps teams building custom pipelines.

Verdict:

For prospecting search: UpLead and Seamless.AI both offer robust search interfaces. Seamless.AI edges ahead with Intent Data add-ons.

For enrichment at scale: FullEnrich's waterfall approach and API-first design solve what search-based tools miss—filling gaps in your existing CRM data.

For simplicity: UpLead's core feature set (search + verify + export) requires the least learning curve.

4. CRM Integration & Workflow Automation

CRM and Sales Tool Connectivity

UpLead offers native one-click exports to major CRMs (Salesforce, HubSpot, Zoho, Pipedrive, Dynamics 365, Copper) and sales engagement platforms (Outreach, Salesloft, Reply.io, Lemlist). Professional tier supports bi-directional sync for certain CRMs. For any app not natively supported, UpLead connects via Zapier to 1,500+ applications.

Seamless.AI also integrates with Salesforce, HubSpot, Dynamics 365, Pipedrive, Zoho, Outreach, and Salesloft. The Chrome extension can push contacts directly into CRM or sequences with one click. However, some users report the extension can be "buggy on LinkedIn Sales Nav at times" due to rate limits.

FullEnrich focuses on API and no-code workflow tools rather than native CRM integrations. The platform connects via API, Zapier, Make, n8n, and Clay—enabling flexible enrichment pipelines. If you're building automated workflows (e.g., "enrich new HubSpot leads on entry"), FullEnrich's API-first design gives you more control than pre-built CRM sync.

API and Developer Experience

UpLead provides a REST API (available on Pro/Enterprise) with endpoints for person/company search, email verification, and bulk prospector queries. Rate limit: 500 requests/minute by default. The API documentation is public.

Seamless.AI offers a REST API marketed as SOC 2 Type II certified and "GDPR, HIPAA compliant" (though GDPR compliance is vague—see Compliance section). The API is an add-on (typically Enterprise clients) and supports ~100 requests/minute with high concurrency.

FullEnrich includes API access on all plans, even Starter ($29/month). The API allows programmatic enrichment with webhook support for async results. You can integrate FullEnrich into ETL pipelines, CRM automation, or product features without tier restrictions.

No-Code Automation Workflows

All three platforms support Zapier. FullEnrich goes further with native Make, n8n, and Clay integrations—popular with RevOps teams building custom enrichment flows. For example, you can trigger enrichment when new leads enter HubSpot, then route verified contacts to sales reps based on territory.

Verdict:

For native CRM depth: UpLead and Seamless.AI both offer solid one-click integrations. UpLead's bi-directional sync on Pro gives it a slight edge.

For API-first flexibility: FullEnrich wins by including API access on all plans and supporting modern no-code tools (Make, Clay, n8n) that RevOps teams use.

For enterprise workflow automation: All three can integrate via API, but FullEnrich's webhook support and dynamic provider selection make it ideal for custom pipelines.

5. Compliance & Privacy Considerations

UpLead's Compliance Stance

UpLead states compliance with GDPR and CCPA. The service collects business contact data and asserts "Legitimate Interest" as the legal basis in EU jurisdictions. UpLead has implemented Standard Contractual Clauses (SCCs) for EU data transfers and offers an online opt-out form for data removal.

DPA availability: Not publicly posted, but provided upon request for enterprise customers needing GDPR Article 28 compliance.

Breach history: No known data breaches. However, in 2024 UpLead was fined $34,400 by the California Privacy Protection Agency for failing to register as a data broker by the required date. This was a procedural compliance step, not a data leak. UpLead quickly registered and settled.

Seamless.AI's Compliance Stance

Seamless.AI provides a CCPA Compliance notice and is registered as a Data Broker in California. The platform emphasizes B2B contacts (business emails, work numbers) and claims all data is publicly sourced.

On GDPR, compliance statements are vague. The Terms of Use warn the service "might not be suitable for use outside the US" with respect to data privacy laws. There is no clear GDPR compliance certification or publicly available DPA. The API documentation says the product "aligns with GDPR standards" and has SOC 2 Type II certification, but no explicit GDPR DPA or lawful basis explanation exists.

Breach history: No known breaches. However, Seamless.AI faces a pending class-action lawsuit (Spindler v. Seamless Contacts Inc., filed 2023) alleging use of individuals' names and information in marketing without consent—a "right of publicity" violation. Additionally, LinkedIn took action against Seamless.AI's company page in 2023, presumably for violating LinkedIn's terms.

FullEnrich's Compliance Approach

FullEnrich emphasizes no contact database—the platform doesn't store contact information, only querying providers in real-time. This reduces data retention risk.

GDPR & CCPA: Fully aligned. FullEnrich publishes a Data Processing Agreement (DPA) online with Standard Contractual Clauses for EU transfers. The platform only selects GDPR/CCPA compliant providers and audits them regularly.

Breach history: None reported.

Verdict:

For published and compliance clarity: FullEnrich leads with a public DPA and "no database" model that simplifies GDPR obligations.

6. User Experience & Support

UpLead's User Experience

UpLead's UI is consistently praised for simplicity. The platform requires minimal training—search filters are intuitive, and the Chrome extension integrates naturally with LinkedIn. One small-business user on Reddit shared: "UpLead was a better fit for us…easier to navigate and still gives you access to verified emails and company info."

Support: Email and live chat (higher tiers), with responsive customer success on Professional/Enterprise plans. One G2 reviewer noted: "We had incredible support from multiple team members that continually show a concern for our success."

Friction point: Cancellation requires 60 days' notice on annual plans, and some users report needing a Zoom call to cancel even monthly subscriptions. This isn't obvious upfront.

Seamless.AI's User Experience

Seamless.AI's interface is smooth and the Chrome extension is frequently praised. Daily credit refreshes on Pro make it easy to prospect continuously. However, the add-on feature model confuses some users—base plans may lack AI Assistant, Intent Data, or bulk enrichment, requiring mid-contract upgrades.

Support: Mixed feedback. Some users praise onboarding and training, while others report support becomes "unhelpful after they signed the contract." A Reddit user warned: "Terrible customer service once you're past the sale and onboarding."

Major friction: Cancellation requires a Zoom call and 60 days' written notice. A G2 reviewer described this as "brutal and inflexible." The Better Business Bureau shows multiple complaints about unwanted auto-renewals.

FullEnrich's User Experience

Minimal learning curve—upload CSV, get enriched data back. LinkedIn extension exports with one click.

Users praise responsive support and user friendly interface. Team actively engages with customer feedback.

Support: Email support, comprehensive API documentation, and a knowledge base. Live chat or dedicated CSM on all tiers.

Verdict:

For ease of use: Full enrich and Seamless.AI tie—both offer simple search interfaces with Chrome extensions.

For teams with technical teams: FullEnrich's API-first design is ideal for RevOps building automated enrichment pipelines.

For cancellation ease: UpLead and FullEnrich allow self-service cancellation. Seamless.AI requires a Zoom call—a significant friction point.

UpLead vs Seamless.AI: Which Solution Fits Your GTM?

You need verified contact data to power outbound, ABM, or lead scoring. But which platform fits your go-to-market motion?

Why GTM Teams Are Switching to Waterfall Enrichment

Here's what no single-source provider advertises: even 95% accuracy means 1 in 20 emails bounces. For a 1,000-contact campaign, that's 50 bounced emails damaging your sender reputation.

But accuracy is only half the problem.

The bigger issue is coverage. When UpLead or Seamless.AI can't find a contact, you've burned a credit for nothing. Single-source databases have blind spots—regional gaps, industry gaps, job title gaps. One provider might crush it in US tech but fail in European healthcare.

This is the single-source trap: you're locked into one provider's strengths and weaknesses, with no fallback when they don't have the data.

Waterfall enrichment changes the equation. Instead of relying on one database, FullEnrich queries 15+ sources sequentially. If Apollo doesn't have the contact, it checks Clearbit. If Clearbit fails, it tries Snov.io, Hunter, and 12 others—until a match is found.

What you get with FullEnrich:

✓ ~80% average match rates (often higher) vs 50-70% from single sources
✓ Only pay when contact is found—no credit burn on "not found" lookups
✓ Triple email verification (including catch-alls) drops bounce rates to <1%
✓ Dynamic regional optimization—automatically selects best sources for EU, APAC, US
✓ API on all plans ($29/month+) for custom RevOps workflows
✓ 3-month credit rollover eliminates use-it-or-lose-it pressure
✓ Unlimited users so your whole team can enrich without seat fees

More importantly: FullEnrich doesn't charge you for contacts it can't find. Single-source tools burn credits whether they find the contact or not.

Start with 50 free credits. No credit card required.

The Verdict: Choosing Between UpLead and Seamless.AI

UpLead and Seamless.AI solve different problems at different price points.

UpLead delivers verified email accuracy with 95%+ real-time verification and credit-back guarantees. Transparent pricing starts at $99/month with month-to-month flexibility. Best for small to mid-market teams where email deliverability and budget predictability matter more than raw volume.

Seamless.AI offers high-volume prospecting with daily credit refreshes (~1,000/day on Pro plans) and a free entry tier (50 credits/month). However, accuracy varies (18-23% bounce rates reported), pricing requires sales quotes, and annual contracts with 60-day cancellation windows create lock-in. Best for teams with cleanup resources who need continuous prospecting volume, primarily in North America.

Looking beyond Seamless AI and UpLead? There are some Lusha alternatives or UpLead alternatives like FullEnrich worth exploring.