ZeroBounce vs Trueguard.

For real-time verification inside a product, yes. Trueguard checks syntax, MX, SMTP, disposable, catch-all, role-based, and free-mail signals in one API call for a flat $49.99 a month per 50,000 validations, against $379 a month for the same volume on ZeroBounce ONE, with the full check set on every plan and no credits to buy or watch expire. Disposable and temporary email detection is a first-class signal, backed by a continuously updated registry. Bot and fraud prevention run on the same platform, so a risky address is correlated with device, IP, and network fingerprints. ZeroBounce is email deliverability only.

For ongoing verification, yes. Comparing the two monthly plans directly, Trueguard is $49.99 a month for 50,000 validations and ZeroBounce ONE is $379 a month for the same 50,000 credits, about 7.5 times more. ZeroBounce ONE starts at $99 a month for 10,000 credits, or $79 billed annually. If you would rather buy the volume outright, ZeroBounce's pay-as-you-go pack for 50,000 is $499 at $0.00998 per credit. One fair caveat: the ZeroBounce ONE price also bundles inbox placement testing, warmup, blacklist monitoring, and an email finder, so it is not buying verification alone.

Conditionally. ZeroBounce's own purchasing FAQ states that for clients registering after 1 June 2026, credits never expire while a ZeroBounce ONE subscription is active, and otherwise expire two years after the last payment or active subscription day. That is a longer runway than most vendors give, but it is narrower than the Credits Never Expire badge suggests. Trueguard has no credits at all. The plan resets monthly, so there is nothing to lose track of.

ZeroBounce guarantees 99.6% accuracy on most providers and 96%+ on AOL, Yahoo, and Office 365, backed by a 5x refund formula with published conditions. Independent tests published in 2026 measured lower figures in practice: LeadMagic put it at 97.8% over 10,000 addresses, WizLeads measured a 3.70% real bounce rate on addresses ZeroBounce called valid, and Allegrow measured an 8.1% false-positive rate on a controlled catch-all set. Each of those tests was published by a company selling a competing verifier, so treat every number as vendor-run rather than neutral. What is notable is that three differently-authored tests converged on the same weak point: catch-all domains.

Yes. Trueguard's API free tier is 100 validations per month, no credit card required. The free single-email tool at trueguard.io/email-verifier allows 10 checks per day with no signup at all. These are separate quotas: the tool is for manual one-off checks, and the API free tier is for integrating the endpoint. ZeroBounce also gives 100 validation credits per month on its Freemium tier.

Yes. Disposable and temporary email detection is a core Trueguard signal, backed by a real-time, continuously updated registry of throwaway domains such as Mailinator, Guerrilla Mail, Temp-Mail, and 10MinuteMail. It runs in the same API call as the rest of the validation checks and is included on every plan, with nothing gated behind a higher tier.

Trueguard returns four statuses: Safe (deliverable), Risky (technically deliverable but carrying a quality flag such as catch-all or disposable), Invalid (not deliverable), and Unknown (the mail server gave no clear answer). ZeroBounce returns seven top-level statuses with more than thirty sub-statuses. To migrate, map valid to Safe, invalid to Invalid, unknown to Unknown, and catch-all, spamtrap, abuse, and do_not_mail to Risky, then read the specific flag on the Risky response.

Yes. Trueguard offers EU data residency and a Data Processing Agreement at trueguard.io/data-processing-agreement, available on every plan including the free tier. ZeroBounce states that EU customer data is transmitted, stored, and processed only on EU servers and provides a DPA to EU customers at sign-up. Both services meet EU data-residency requirements, so residency alone is not the reason teams switch. Price and credit rules are.

Two cases. First, if your purchase runs through a security questionnaire that demands SOC 2 Type II, ISO 27001, or HIPAA, because ZeroBounce holds all three plus PCI DSS. Second, if you want sender deliverability tooling from the same vendor as verification: inbox placement testing, blacklist monitoring, DMARC monitoring, warmup, and an email finder. Outside those two cases you are paying premium credit rates for a check that a flat monthly plan covers for less.