Email Client vs Post SMTP
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Email Client
Manage all your email accounts in one place with features like read receipts, scheduled sending, and AI-powered writing feedback. Quickly schedule meetings directly from your inbox and pause incoming messages when you need to focus.
- One-tap calendar scheduling
- Read receipts
- Email scheduling
- Inbox Pause
- AI writing feedback
- Multiple account support
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Join millions who use Boomerang to email productively! See all of your email accounts, get one-tap calendar scheduling, see read receipts, and schedule emails to be sent later. Works with Gmail, Outlook & Hotmail accounts. NEW: Set Boomerang as your default email. Select Settings - scroll down, select Boomerang - tap Default Email App - tap Boomerang. ***Featured in NYT, TC, Inc., The Guardian and more!*** Why Boomerang: • NEW! One-tap calendar scheduling. Share availability and schedule a meeting while in email. • NEW! Set different colored email accounts. • Read Receipts. Track email opens and clicks. • Easy follow up: Get notified when no one replies to your email. • Inbox Pause: Stop incoming emails until you’re ready for them. • Email scheduling. Schedule emails to be sent later. • Get faster replies: Our AI gives you feedback to write better emails. Know if your emails are too short, too wordy, or just right. • Offline Support • Dark Mode • Custom swipes Loving the app? Please post a positive review. Thank you for your five stars. It really helps! Questions/feedback? Email us at support+iphone@boomerangapp.com or tweet to @Boomerang A BIG thanks to everyone who rates us 5 stars. Your support means the world to us. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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.
- Email delivery monitoring
- Failure notifications
- Resend failed emails
- Email content preview
- Multiple site support
- SMTP service integration
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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
Verdict
The clearest difference is review sentiment: Email Client at 39% against Post SMTP's 0%. Post SMTP's advantage is iOS requirement (13.4 vs 15.0). On price, update cadence, ads and in-app purchases 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
Both are free to download. Email Client sells 8 in-app purchases, starting at $19.99 per month 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.
Both ship on a similar rhythm, roughly every 6 weeks. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.
| Parameter | Email Client | Post SMTP |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (4.7K ratings) — better | — |
| Positive reviews | 39.1% of reviews — better | 0.0% of reviews |
| Number of ratings | 4.7K — better | — |
| Update frequency | Every 6 weeks | Every 6 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 13.4 — better |
| Further details — not scored | ||
| Size | 92 MB | 23 MB |
| Age rating | 9+ | 4+ |
| Developer | Baydin Inc. | Ahmed ElDin |
Customer experience
Email Client
Post SMTP
Bugs and requests
Email Client
Reported bugs
4 issues- Emails not loading properly
- Unread email count not updating correctly
- Scheduled emails not sending at the right time
- Compatibility issues with other apps (e.g., SwiftKey)
Requested features
6 requests- Unified inbox for multiple email accounts
- Customizable swipe gestures
- Dark mode
- Better email threading and conversation view
- Improved notification handling
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- Support for more email providers (e.g., iCloud, Yahoo)
Post SMTP
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Email Client
- Boomerang Gmail Pro Monthly7 Days trial$19.991 Month
- Boomerang Gmail Pro Monthly3 variants$19.991 Month
- Boomerang Outlook Pro Monthly7 Days trial$19.991 Month
Show 5 moreShow fewer
- Boomerang Outlook Pro Monthly3 variants$19.991 Month
- Boomerang Gmail Pro Yearly14 Days trial$179.991 Year
- Boomerang Gmail Pro Yearly2 variants$179.991 Year
- Boomerang Outlook Pro Yearly14 Days trial$179.991 Year
- Boomerang Outlook Pro Yearly$179.991 Year
Post SMTP
- Monthly Pro Access$4.991 Month
- Annual Pro Access$39.991 Year









