- You want spam testing, inbox placement, client previews and AI eye-tracking heatmaps in one plan. ZeroBounce has no rendering previews and no heatmaps.
- You want to test deliverability without committing to a verification suite: Unspam's paid pricing starts at $5/mo, charged per test, while ZeroBounce's bundled deliverability tools sit on its ONE plan, listed at $99/mo ($79/mo billed annually).
- You want a free tier that renews monthly: 5 spam tests, 3 inbox placements, 3 device previews, 5 screenshots and 5 heatmaps, AI assistant included, no card. ZeroBounce's free tier is 100 verification credits, 1 inbox placement test, 1 email server test, 1 blacklist monitor and 10 Email Finder searches a month, and it requires a business or premium domain.
- You want results in about 30 seconds and a 14-day no-questions-asked refund on every paid plan.
A ZeroBounce alternative that adds client previews and AI heatmaps
ZeroBounce is a large-scale email verification service that bundles a deliverability suite (inbox placement, warmup, blacklist and DMARC monitoring) into its ONE plan, listed at $99/mo ($79/mo billed annually). Unspam focuses on the campaign itself: spam testing, inbox placement, client previews and an AI eye-tracking heatmap in one plan, from $5/mo with a free tier and no card.
Compared from public pricing and product pages, September 2026.
Which one fits you?
- You verify email lists at scale. That is ZeroBounce's core product: 99.6% accuracy guaranteed in writing (96%+ on AOL, Yahoo and Office 365), more than 60 billion addresses verified, with pay-as-you-go credit packs from $39 for 2,000. Unspam includes verification but is not built for bulk list cleaning at that volume.
- You need automated inbox warmup. ZeroBounce ONE includes 250 warmup seeds a month, and Unspam does not warm up inboxes at all.
- You need continuous blacklist monitoring. ZeroBounce scans your domain or IP every 8 hours on a paid subscription; Unspam's blacklist checker runs on demand, and while it does monitor DMARC, it never watches blocklists on a schedule.
Why teams move from ZeroBounce to Unspam.
The render ZeroBounce doesn't show
ZeroBounce tells you whether an address is valid and where mail lands, but not how the email looks. It has no client rendering previews and no heatmaps. Unspam includes device previews and an AI eye-tracking heatmap on every plan, including the free one, so a broken layout shows up before the campaign does, not after.
A lower entry point for testing
ZeroBounce's bundled deliverability tools (inbox placement, warmup, blacklist and DMARC monitoring) sit on the ONE plan, listed at $99/mo ($79/mo billed annually). If you mainly want to test campaigns before sending, Unspam charges per test, from a $5 monthly minimum at $0.18 a spam test, with a 14-day no-questions-asked refund.
An AI assistant that explains the fix
ZeroBounce returns verification results, an AI deliverability score and monitoring data, but no AI assistant to interpret them and recommend changes. Unspam includes an AI assistant on every plan, free tier included, and returns a result in about 30 seconds with a plain-language explanation of what to change.
Unspam vs ZeroBounce, feature by feature.
Based on public product pages and documentation. Spotted something outdated? Tell us in the chat and we'll fix it.
Feature
Unspam
ZeroBounce
Free plan or trial
Free plan, no card
Free: 100 verification credits/mo
First paid plan
$5/mo minimum, usage-priced
$39 one-time (2,000 verification credits)
Spam score testing
Yes
Partialcontent + server tests, no dedicated spam score
Inbox placement tests
Yes
YesONE plan, 20+ providers
Client previews & screenshots
Yes50+ clients, light & dark
No
AI attention heatmap
Yes
No
Blacklist monitoring
Partialon-demand checker
Yesscans every 8 hours
SPF / DKIM / DMARC checks
Yes
Yes
AI fix recommendations
Yes
No
Scheduled automatic tests
Yesplacement + spam score
Yescontinuous monitoring
Scheduled spam score tests
Yesdaily, weekly, or monthly
Partialno dedicated spam score
Sender accounts
YesUnlimited
Partialconnect a mailbox for warmup only
API access
YesCustom plan
Yes
MCP server
YesCustom plan
YesOfficial server for email validation
Email verification
Yes
Yescore product, at scale
Automated inbox warmup
No
YesONE plan, 250 seeds/mo
DMARC report monitoring
YesCustom plan, first domain free
YesONE plan, 1 domain
Deliverability consulting
Yesseparate service
Yesexpert consulting and audit, separate engagement
Compared from public pricing and product pages, September 2026.
What each one costs.
ZeroBounce sells verification either as one-time pay-as-you-go credit packs (from $39 for 2,000) or as the ZeroBounce ONE subscription, which is its only and minimum subscription and carries the bundled deliverability tools (placement, warmup, blacklist, DMARC monitoring). The old credit-only monthly tiers are retired: the pricing page now offers Freemium, Pay-As-You-Go and ONE, plus a custom ONE plan builder for higher volumes. Prices and ONE inclusions come from ZeroBounce's own pricing page and its Product and FAQPage schemas.
- Free $0
5 spam tests, 3 inbox placements, 3 device previews, 5 screenshots, 5 heatmaps per month. AI assistant included.
- Custom $5/mo
Pay per test: spam tests $0.18, inbox placements $0.50, device previews $0.75, screenshots $0.20, heatmaps $0.30. Volume discounts to 30%, 15% off annual, $5 monthly minimum. API, MCP and three years of history included. DMARC monitoring is $6 per domain per month, first domain free.
- Freemium $0
100 email verification/scoring credits, 1 inbox placement test, 1 email server test, 1 blacklist monitor (scanned every 24 hours) and 10 Email Finder searches per month (resets monthly, business or premium domain required), no credit card. No access to warmup or DMARC monitoring. Free standalone deliverability checker tools.
- Pay-as-you-go (entry) $39 one-time for 2,000 credits
2,000 verification credits ($0.0195/email). Larger packs lower the rate ($69 for 5,000, about $0.0138/email; $129 for 10,000, about $0.0129/email). Credits never expire while a ZeroBounce ONE subscription is active; without one, expiration rules may apply.
Entry pay-as-you-go price per ZeroBounce's own pricing page and its Pay-As-You-Go Product schema (2K $39, 5K $69, 10K $129, 25K $274, 50K $499, 100K $649, 250K $1,299, 500K $2,199).
- Monthly verification subscription From $18/mo for 2,000 credits
Monthly email verification credits that replenish each month at a discount to pay-as-you-go. Higher tiers scale credit volume.
Entry monthly tier reported at $18/mo for 2,000 credits by third-party pricing roundups (mailfloss, usebouncer); some roundups cite higher tiers. ZeroBounce surfaces ONE as its main subscription.
- ZeroBounce ONE $99/mo ($79/mo billed annually)
10,000 validation credits, 100 inbox placement tests, 250 warmup seeds, 10 blacklist monitors, 1 DMARC monitor domain, 100 email server tests, 10,000 email finder searches per month; 15% off additional credits.
Official ZeroBounce ONE page lists 10,000 credits at $99/mo and states 10,000 as the minimum; annual billing is charged once at $948/yr, which ZeroBounce quotes as $79/mo, a 20% discount. Unused tests, monitors, searches and warmup seeds do not roll over; credits do.
Every ZeroBounce plan and price in full
Compared from public pricing and product pages, September 2026. ZeroBounce is a trademark of its respective owner. Unspam is not affiliated with or endorsed by ZeroBounce.
Unspam vs ZeroBounce, answered.
Is Unspam a full replacement for ZeroBounce?
Not for high-volume verification. ZeroBounce's core product is email list verification at scale, and while Unspam includes an email checker, it is not built for bulk list cleaning at that volume. ZeroBounce ONE also offers inbox warmup (250 seeds/mo) and continuous blacklist monitoring, neither of which Unspam does. DMARC monitoring both now have: Unspam's is on the Custom plan, first domain free and room for 500, against one domain on ONE. For pre-send testing, Unspam covers more, adding client previews and AI heatmaps that ZeroBounce lacks.
How does Unspam's pricing compare to ZeroBounce?
Different models. ZeroBounce sells verification by credit (pay-as-you-go from $20 for 2,000 credits, or monthly subscriptions), and bundles its deliverability suite into the ONE plan at $99/mo ($79/mo annually). Unspam charges per test: a free plan, then paid from a $5 monthly minimum at $0.18 a spam test, with a 14-day refund and 15% off annual billing.
What is the biggest functional difference?
ZeroBounce starts from verification and adds infrastructure tools: inbox placement across 20+ providers, warmup, and continuous blacklist and DMARC monitoring. Unspam starts from content testing: spam score, placement across 7 providers (Gmail, Outlook, Yahoo, Zoho, ProtonMail, AOL, GMX), client previews, an AI eye-tracking heatmap and an AI assistant, with DMARC monitoring on the Custom plan. Choose based on whether bulk list hygiene and blocklist monitoring or design-side testing matters more. Suites that bundle verification with placement are a different purchase from single-job tools, and that split is what the category-by-category comparison is built around.
How do the free tiers compare?
ZeroBounce's free tier is 100 verification credits per month (it resets monthly and requires a business or premium domain) plus free standalone checker tools. Unspam's free plan renews monthly with 5 spam tests, 3 inbox placements, 3 device previews, 5 screenshots and 5 heatmaps, the AI assistant included, and no credit card required.