Proofy Review 2026: B2B Data Coverage, Pricing & SyncGTM Comparison

Proofy is a credit-based email verification platform used by 4,740+ companies worldwide. It claims 99%+ accuracy, holds a 4.8/5 rating on Capterra from 548 verified reviews, and offers PAYG credits from $4 per 1,000 verifications with credits that never expire. Our rating: 3.9/5.

The case for Proofy is simplicity and affordability. A free single-email checker requires no credit card. A 15% subscription discount rewards teams with predictable verification volume. HubSpot native integration and Zapier connectivity cover most mid-market marketing stacks. The multi-layer verification pipeline — syntax, domain MX, SMTP handshake, disposable detection, catch-all flagging, spam trap screening, and duplicate removal — covers the core verification use case well.

The limits are equally clear. Proofy verifies contact data you already have — it does not find new contacts, enrich records with firmographics, or signal when accounts enter a buying cycle. Catch-all domains are flagged with no confidence scoring. Live chat support is absent. Native integrations lag behind NeverBounce (80+) and ZeroBounce (35+).

This review covers Proofy's pricing in detail, what the 99% accuracy claim means in practice, catch-all handling, integration depth, and a direct comparison with SyncGTM, NeverBounce, and ZeroBounce for teams evaluating email verification options in 2026.

What Is Proofy?

Proofy — email verification platform used by 4,740+ companies with a 99%+ accuracy guarantee and never-expiring credits.

Proofy is an email verification service that checks whether email addresses are valid, deliverable, and safe to send to before campaign dispatch. It processes addresses through bulk CSV upload (files up to 65 MB, lists up to 1 million emails), a REST API for real-time validation, and a JavaScript widget for signup form integration. The platform does not charge for duplicate or unknown addresses.

The verification pipeline runs through multiple layers: syntax validation (correctly formatted?), domain MX record lookup (does the domain accept email?), SMTP handshake (does the mail server accept this specific address?), disposable email service detection, catch-all server flagging, spam trap screening, and duplicate removal. Each address returns one of several classifications: deliverable, risky (catch-all, disposable, role-based, or potentially invalid), or invalid.

According to Capterra, Proofy holds a 4.8/5 rating across 548 verified reviews — with users switching from NeverBounce, ZeroBounce, Apollo.io, MillionVerifier, and Verifalia, citing Proofy's superior affordability and competitive accuracy. The G2 profile also carries positive sentiment, though with fewer reviews than established players like ZeroBounce.

Proofy Pricing: Plans, Credits, What You Actually Pay

Proofy pricing — tiered PAYG and monthly subscription options with a 15% subscription discount and non-expiring credits.

Proofy uses a credit-based model with two purchase paths: PAYG credits and monthly subscriptions. All credits never expire — regardless of whether you buy PAYG or subscribe. Teams can upgrade, downgrade, or cancel subscriptions anytime. Enterprise clients receive flexible billing options including invoices, ACH, and wire transfers.

Proofy does not charge for duplicates or unknown addresses — only successfully processed verifications consume credits. This matters for real-world list quality: a list with 15% duplicates is cheaper to clean than competitors who charge per row regardless of outcome.

The real cost math

At 10,000 credits, Proofy works out to approximately $0.003/email PAYG or $0.0026/email on a subscription. This is cheaper than NeverBounce at $0.008/email entry-level and comparable to ZeroBounce's $0.0075/email at low volumes. For teams verifying at the 10,000+ credit level regularly, the 15% subscription discount versus PAYG makes the monthly plan the better economics without any lock-in risk (cancel anytime).

The no-charge-for-duplicates policy is meaningful for teams cleaning raw exports from CRM or LinkedIn. A typical export may contain 15–20% duplicates — Proofy's policy means you only pay for the unique, processable addresses.

Proofy Key Features

Multi-layer email verification

Proofy's core verification pipeline runs seven checks: syntax validation, domain MX record lookup, SMTP handshake, disposable email service detection, catch-all (accept-all) server flagging, spam trap screening, and duplicate removal. Each address returns a classification — deliverable, risky, or invalid — based on the full chain of checks, not just a single SMTP response.

The catch-all classification is Proofy's most significant accuracy gap. Servers configured to accept any incoming message regardless of mailbox existence are flagged but receive no confidence score. On B2B enterprise lists, catch-alls can represent 10–30% of addresses. Proofy flags them but leaves teams without data to decide whether to include or suppress those records — a gap that ZeroBounce's AI-powered catch-all scoring addresses directly.

Bulk CSV verification

Bulk verification handles CSV and TXT files up to 65 MB, covering lists of up to 1 million email addresses. Processing speed is approximately 45 minutes per 100,000 emails. Users upload via drag-and-drop dashboard, wait for processing, and download the enriched file with verification status appended. Per Capterra reviewers, some larger batches take longer than expected — Proofy is not the fastest bulk processor in the category.

REST API

Proofy's REST API returns verification results in under one second — suitable for inline validation at form submission, CRM record entry, or outbound sequence triggers. A JavaScript widget integrates directly into signup forms for real-time blocking of invalid addresses at the point of capture. The API documentation is functional but lacks the language-specific SDK libraries that NeverBounce provides.

HubSpot and Zapier integrations

Proofy integrates natively with HubSpot CRM, enabling real-time email validation directly within HubSpot contact records without exporting to CSV. Zapier connectivity extends Proofy to 1,000+ additional apps — Salesforce, Mailchimp, ActiveCampaign, and more — via no-code automation. While this covers most team needs, it requires an active Zapier subscription for anything outside HubSpot, unlike Emailable and NeverBounce, which offer direct CRM connectors without Zapier as middleware.

ISP and SMTP provider detection

Beyond basic deliverability, Proofy identifies the ISP (consumer vs. business) and the SMTP provider for each verified address. This metadata helps segmentation — distinguishing Gmail personal accounts from Google Workspace business accounts, for example — and identifying which ESP handles delivery for a given domain.

Proofy Pros: What It Does Well

• ✓
  Free unlimited single-email checker. Verify individual emails forever with no credit card and no daily limit. More useful than ZeroBounce's 100-credit free tier or Emailable's 250-credit trial for teams that routinely spot-check contacts before outreach.
• ✓
  Credits never expire — on any plan. Both PAYG and subscription credits carry no expiry date. Buy a bundle in January, use it in December without pressure. The 15% subscription discount is additive — teams that verify regularly get better economics without losing the flexibility of non-expiring credits.
• ✓
  No charge for duplicates or unknowns. Raw CRM exports and LinkedIn scrapes routinely contain 15–20% duplicates. Proofy's policy means you pay only for processed, unique addresses — making cost predictability better for messy source lists.
• ✓
  Strong user satisfaction scores. 4.8/5 on Capterra from 548 reviews — above NeverBounce and comparable to Emailable in user-rated accuracy, ease of use, and value for money. Users who switched from NeverBounce, ZeroBounce, and Apollo.io consistently cite Proofy's price-to-accuracy ratio as the primary reason.
• ✓
  HubSpot native integration. Direct CRM verification without CSV exports. Real-time validation at record entry keeps HubSpot contact data clean without manual intervention. For HubSpot-centric teams, this is a meaningful workflow advantage over tools that require Zapier as middleware for every CRM operation.
• ✓
  Responsive customer support. Capterra and G2 reviewers consistently cite fast, helpful support responses. While live chat is absent, the ticket and email response quality earns high marks — important for teams running time-sensitive verification workflows before campaign launches.

Proofy Cons: Where It Falls Short

• No B2B contact discovery. Proofy verifies emails you provide — it does not find new prospects, enrich contact records, or return firmographic data. You need a separate tool for everything upstream of list cleaning.
• No catch-all confidence scoring. Proofy flags catch-all (accept-all) domains with no scoring to help decide whether to send. On enterprise B2B lists, accept-alls can represent 10–30% of records — a large ambiguous batch that verification alone cannot resolve.
• No live chat support. Proofy does not offer live chat, relying on email and ticket-based support. Multiple Capterra reviewers flag this as a gap compared to ZeroBounce and NeverBounce, which both offer real-time support options.
• Limited free trial capacity. While a free single-checker exists, bulk verification requires paid credits starting at $4. New users evaluating list cleaning accuracy at scale have limited trial depth compared to NeverBounce's 1,000-email free trial.
• Fewer native integrations. Proofy's native connector count — HubSpot and Zapier — is narrower than NeverBounce (80+) or ZeroBounce (35+). Teams using Salesforce, Mailchimp, ActiveCampaign, or Klaviyo directly require Zapier automation rather than a plug-and-play connector.
• No buying signals or enrichment layer. Proofy confirms whether an address is deliverable — not whether the company is actively in a buying cycle, recently hired, or just raised funding. Signal-based outbound requires a separate platform entirely.
• Processing delays on large batches. Some users report that large bulk uploads take longer than expected. At 45 minutes per 100,000 emails (claimed), Proofy is slower than faster-processing alternatives like Emailable and NeverBounce for time-sensitive campaign launches.

Proofy vs Alternatives: Comparison Table

The email verification category divides into two camps: verification-only tools (Proofy, NeverBounce, Kickbox) and full enrichment platforms (SyncGTM, ZeroBounce with email finder). Here is how Proofy compares across dimensions that matter for B2B teams in 2026.

The honest take on each option

Proofy wins on price-to-accuracy ratio and the no-charge-for-duplicates policy. For teams cleaning existing contact lists at low-to-mid volume, Proofy delivers verified results at a lower cost per email than NeverBounce at comparable volumes, without expiring credits. The unlimited free single-email checker is the most accessible tool for spot-checking in the category. HubSpot native integration is a meaningful advantage for CRM-driven teams over API-only tools.

SyncGTM is the right choice when verification is only one part of what your team needs. SyncGTM enriches contacts from scratch across 50+ waterfall providers — finding emails, mobile numbers, and firmographics for your target ICP — and adds buying signals (hiring surges, funding rounds, tech stack changes, job changes) to tell you when accounts are in-market. SyncGTM eliminates the need for a standalone verification tool by delivering pre-enriched, validated contacts directly. See the best waterfall contact providers comparison for how that coverage model works.

ZeroBounce is stronger than Proofy on catch-all scoring (AI confidence levels vs. plain flagging) and spam trap detection. It also offers an email finder for net-new contact discovery. At $15/mo for 2,000 credits, it is more expensive at entry level but adds more analytical depth for teams with older or cold-acquired B2B lists where catch-all resolution and spam trap accuracy are critical.

NeverBounce leads on native integrations (80+ connectors) and market depth — 3,000+ G2/Capterra reviews and ZoomInfo backing. Best for teams already in the ZoomInfo ecosystem or those needing plug-and-play integration with the widest range of ESP and CRM tools. Proofy beats NeverBounce on per-email cost at comparable volumes.

For a broader comparison of verification tools alongside full-enrichment platforms, see the NeverBounce review and the Emailable review.

Who Should Use Proofy?

Proofy fits a specific profile: you have existing contact lists that need cleaning, want affordable PAYG or subscription credits that never expire, and use HubSpot or Zapier-connected tools without needing a deep native integration library.

Use Proofy if:

• You need spot-checking capability at zero cost — the unlimited free single-email checker covers ongoing individual lookups without any paid plan.
• You verify at irregular intervals and want credits that never expire — buy a PAYG bundle, use it over months without losing value.
• You use HubSpot as your CRM and want native in-CRM email validation without CSV exports or Zapier middleware.
• Budget is a priority — Proofy is consistently cited by switchers from NeverBounce and ZeroBounce as cheaper for comparable accuracy at low-to-mid volumes.
• You clean lists with significant duplicates — the no-charge- for-duplicates policy means your effective cost per unique verified address is lower than competitors.

Do not use Proofy if:

• You need to find email addresses, not just verify ones you already have. Proofy has no contact discovery or enrichment capability. For building lists from scratch, use SyncGTM's waterfall enrichment.
• Catch-all confidence scoring is critical. Proofy flags catch-alls with no scoring — on enterprise B2B lists, this leaves 10–30% of records unresolved. ZeroBounce's AI catch-all scoring is the stronger choice.
• You need live chat support for time-sensitive workflows. Proofy is email and ticket only — if real-time support matters, ZeroBounce and NeverBounce both offer live chat.
• You use Salesforce, Mailchimp, or ActiveCampaign directly and want a native connector without Zapier overhead. NeverBounce and ZeroBounce offer direct integration at higher integration counts.
• Processing speed is critical for time-sensitive campaigns. Proofy's ~45 minutes per 100K emails is slower than Emailable and NeverBounce for same-day large-list launches.

For teams that want enrichment, verification, and buying signals in a single workflow, the MillionVerifier review and the Kickbox review cover the broader verification landscape before deciding on a standalone tool.

Proofy Review: Frequently Asked Questions