Comparison

ZeroBounce vs Post SMTP

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ZeroBounce

This service offers a fast and secure way to validate email addresses, ensuring your messages reach their intended recipients. It helps improve open rates and ROI with high accuracy, AI-driven scoring, and deliverability tools.

Highlights
  • Email list validation
  • Real-time bulk checking
  • AI-driven email scoring
  • Deliverability tools
  • Blacklist alerts
Features
Read full description

Accurate, fast and secure email validation service - We help you land them in the inbox and connect with your customers. Drive up your open rates and ROI with our 99% accurate email validation, A.I.-driven email scoring, and powerful deliverability tools Will this email bounce? Check your list – in bulk and in real time Is that email address active? Use our A.I. email scoring system to find out Is your email in perfect shape? Test it before you send Am I on any blacklists? Get alerts about your domain and IP

About

Post SMTP

Monitor WordPress email delivery and troubleshoot failures from your mobile device. Get instant notifications for issues, preview email content, and resend failed messages with ease. Connect to multiple WordPress sites and various SMTP services.

Highlights
  • Email delivery monitoring
  • Failure notifications
  • Resend failed emails
  • Email content preview
  • Multiple site support
  • SMTP service integration
Features
Read full description

PostSMTP Mobile App is the only app for WordPress email delivery monitoring, which helps you notify regarding email failures, show error details, preview the content of emails, resend failed emails, track multiple WP sites and more. The Post SMTP Mobile App works seamlessly with the Post SMTP plugin. To use the Post SMTP Mobile App: INSTALL IN JUST 3 STEPS 1• Login to your WordPress site 2• Navigate to Post SMTP → Mobile App 3• Scan the QR Code That's it! You can now see all your WordPress emails on your phone. POST SMTP APP FEATURES With the Post SMTP Mobile App, you can: • Monitor the status and performance of your WordPress emails • Receive notifications for any email failures and take action • Resend a failed email quickly and easily with one click • Preview the content of your email within the app • Connect multiple WordPress sites with the app • View the error details and solutions for any email failure CONNECT TO SMTP SERVICE OF YOUR CHOICE With the Post SMTP WordPress plugin, you can connect to any SMTP service, including; • Microsoft 365 (formerly Office 365) • SendGrid • Gmail • Brevo (Formerly Sendinblue) • Mailgun • Mandrill • Mailjet • Amazon SES • Elastic Email • PostMark • SparkPost • OR any SMTP service Finally, make sure your WordPress emails go right in your user's inbox. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

ZeroBounce4 screens
Post SMTP4 screens

Verdict

The call

The clearest difference is review sentiment: ZeroBounce at 100% against Post SMTP's 0%. ZeroBounce also leads on update cadence (every 9 days vs every 6 weeks). Post SMTP's advantage is iOS requirement (13.4 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ZeroBounce sells 7 one-off in-app purchases and Post SMTP sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

ZeroBounce ships an update every 9 days, Post SMTP every 6 weeks. The most recent releases landed on September 23, 2026 and September 26, 2026 respectively.

Scorecard3 real differences · 7 level
ZeroBounce versus Post SMTP: the parameters behind the verdict, then further details
ParameterZeroBouncePost SMTP
PriceFreeFree
Rating5.0 (3 ratings) — better—
Positive reviews100.0% of reviews — better0.0% of reviews
Number of ratings3 — better—
Update frequencyEvery 9 days — betterEvery 6 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPodiPhone, iPod
Requires iOS15.013.4 — better
Further details — not scored
Size68 MB23 MB
Age rating4+4+
DeveloperZeroBounceAhmed ElDin

Customer experience

ZeroBounce

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Post SMTP

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

7 purchases

ZeroBounce

One-time7
  • 2000 credits$39.00
  • 5000 credits$69.00
  • 10000 credits$129.00
Show 4 more
  • 25000 credits$274.99
  • 50000 credits$499.00
  • 100000 credits$649.00
  • 250000 credits$1000.00
2 purchases

Post SMTP

Subscriptions2
  • Monthly Pro Access$4.991 Month
  • Annual Pro Access$39.991 Year

Questions

Is ZeroBounce free?
ZeroBounce is free to download, with in-app purchases available.
Is Post SMTP free?
Post SMTP is free to download, with in-app purchases available.
Do ZeroBounce or Post SMTP have ads?
Neither ZeroBounce nor Post SMTP shows ads.
Which is updated more often, ZeroBounce or Post SMTP?
ZeroBounce ships an update every 9 days, and Post SMTP every 6 weeks. Most recently, ZeroBounce was updated on September 23, 2026 and Post SMTP on September 26, 2026.

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