Mailsurity vs ZeroBounce
ZeroBounce ONE sells a nine-tool bundle for $99/month. Mailsurity sells one tool: disposable email detection. No lead scoring, no inbox placement tests, no blacklist monitors. One API that answers one question in real time, and does it better than a bundle spread nine ways thin.
Pricing
ZeroBounce either charges per verification or bundles nine tools into a flat $99/month. Mailsurity charges a monthly subscription for one job only. Figures below are Mailsurity’s live current prices, not estimates.
Mailsurity
Disposable & temporary email detection, and nothing else.
Free tier
500 free credits, no card required.
Paid plans
Starting at $5/mo, disposable detection only. Full plan breakdown in the grid below.
ZeroBounce
Nine bundled tools: email validation, scoring, finder, inbox testing, and more.
Free tier
A genuine $0 tier below ZeroBounce ONE, with a limited starting credit allotment across its bundled tools. See zerobounce.net for the current exact limits.
ZeroBounce ONE
From $99/mo for a minimum of 10,000 credits, shared across nine bundled tools: email validation, AI-based scoring, Email Finder, inbox-placement testing, blacklist monitoring, and more.
Starter
$5 / month
5,000 checks / month
≈ $1.00 per 1,000 checks*
Growth
$19 / month
25,000 checks / month
≈ $0.76 per 1,000 checks*
Scale
$59 / month
100,000 checks / month
≈ $0.59 per 1,000 checks*
* Cost-per-1,000 assumes the full monthly credit allotment gets used. Unused Mailsurity credits don't roll over, so the effective rate is higher below full utilization.
Prices shown are Mailsurity's current live plans (see /pricing for the full breakdown, including annual billing). ZeroBounce figures are verified as of July 2026. Confirm current rates on zerobounce.net before making a purchasing decision, since vendor pricing can change.
Feature breakdown
Disposable & temporary email detection
Mailsurity: Core product, always-on
ZeroBounce: One feature among nine
Real-time AI fallback for brand-new domains
Mailsurity: For a brand-new domain it hasn’t seen before, an AI model makes the call in real time
ZeroBounce: Not documented as a dedicated capability
Typical latency
Mailsurity: <100ms p99 on the real-time API
ZeroBounce: Not published
Full email verification (syntax, SMTP, catch-all)
Mailsurity: Not the focus
ZeroBounce: Core product
AI lead scoring & Email Finder
Mailsurity: Not offered
ZeroBounce: Bundled in ZeroBounce ONE
Deliverability tools (inbox placement, blacklist monitor)
Mailsurity: Not offered
ZeroBounce: Bundled in ZeroBounce ONE
Integration
Mailsurity: One POST endpoint, works with a plain fetch call, no SDK required
ZeroBounce: Multiple tools/dashboards across the suite
The “no SDK required” row above, in full: this is the entire integration, a single authenticated POST with plain fetch. You don't need a client library.
curl -X POST https://mailsurity.com/api/check-email \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"email": "user@mailinator.com"}'Full request/response schema, error codes, and examples in seven more languages: see the API reference.
The list problem (and how Mailsurity solves it)
ZeroBounce doesn’t publish the mechanics of its disposable-email check, so this is an inference from how most list-based email-verification products work, not a confirmed fact about ZeroBounce specifically: most work by matching against a known domain list. That catches everything already on it, but a brand-new throwaway domain has to be discovered and added before any list-based check can flag it.
Mailsurity layers MX-cluster reputation and an AI fallback on top of its own 220k+ domain list. Many throwaway services reuse the same mail servers: a brand-new domain pointing at a known throwaway host is suspect immediately. A gray-zone domain no list has seen still gets a real-time AI verdict. See the full 5-layer detection cascade for how each layer works.
Which one should you pick?
Pick ZeroBounce if…
You need a full email toolkit (mailbox verification, lead scoring, inbox placement tests) and disposable detection is just one item on a longer checklist.
Pick Mailsurity if…
Your problem is fake signups, free-trial abuse, or inflated subscriber lists. You want one real-time endpoint with an AI fallback for domains no list has caught yet, and a free tier you you can try without pulling out a credit card, plus a free tier you can start on before committing to a paid plan.
It doesn't have to be either/or. Adding Mailsurity next to an existing ZeroBounce setup isn't a migration, there's no account or list to move. You add one POST call at your signup endpoint and keep ZeroBounce for the batch verification and deliverability work it already does.
FAQ
Is Mailsurity a cheaper alternative to ZeroBounce?
Depends on what you need. ZeroBounce ONE starts at $99/mo for 10,000 credits shared across nine tools. Mailsurity starts free (500 credits, no card), and its cheapest paid plan, Starter, is $5/mo for 5,000 checks (about $1.00 per 1,000 checks), because it only does one job, disposable-email detection, not a full verification suite. If you only need that one job, it's a meaningfully cheaper alternative; if you need the other eight tools in the bundle, it isn't a substitute for them.
Does Mailsurity do full email verification like ZeroBounce (syntax, SMTP, catch-all)?
Mailsurity answers one question: is this email disposable? ZeroBounce is a broader suite. If you need lead scoring or inbox placement testing, ZeroBounce covers that. If you only need to catch disposable signups, paying for nine tools is overkill.
Can I use Mailsurity alongside ZeroBounce?
Some teams run Mailsurity at signup time (<100ms) to block disposable addresses instantly, then use a full verification suite for list hygiene. They are complementary.
Does ZeroBounce catch brand-new disposable domains the way Mailsurity does?
List-based checkers work from a known domain list. A domain is not flagged until someone adds it. Mailsurity layers MX-cluster reputation and an AI fallback on top of its own list, so a gray-zone domain no one has seen before can get flagged on its first request.
Is Mailsurity a good ZeroBounce alternative for disposable-email detection specifically?
If stopping disposable signups is the problem, then yes. Mailsurity is built around that one job (220k+ domains, 99.4% accuracy, <100ms p99). For ZeroBounce it is one feature among nine. If you also need inbox placement testing or lead enrichment, ZeroBounce ONE covers that. If you just want to block burner emails at signup, Mailsurity does it for less.
How many disposable signups get through your forms
Paste your signup emails or domains and get a free breakdown before you commit. The part before the @ never leaves your browser.