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Email Preview Tool

Email previews for the inbox win

Preview your email across 120+ clients and devices, catching email rendering issues before you send. Inbox Monster gives your team real email device previews, per-preview collaboration and innovative preview tools, so nothing reaches the inbox broken.

See it in action
Inbox Monster preview panel showing the same MonstieCard email rendered on Android Gmail, Gmail dark mode and Android Outlook, with a 120+ previews badge, AI summary and dark-mode-rendered callouts.

300+ leading brands run on Inbox Monster

Why email teams choose Inbox Monster for testing and rendering

See your email everywhere it lands, from the inbox list to dark mode to how AI reads it, before a single subscriber does.

Preview across 120+ clients and devices

See your email across 120+ modern clients and devices, from Outlook and Gmail to iPhone, Android and Samsung, in both light and dark mode.

Comment on a specific preview

Pin a comment to one device or client and it rolls up into your previews tab, so a one-line issue on a single version never gets missed.

Edit and re-test without switching platforms

Fix HTML and make easy edits directly in the platform. Maintain version control, and re-run the checks. No round-trip to your ESP.

QA for the whole team with unlimited seats

Previews, edits and approvals in one workspace your whole team can use, with no per-user fee.

How it works in your workflow

Preview across every client and device

One test, every inbox that matters

Inbox Monster renders your email across 120+ modern clients and devices, including light and dark mode, so you see your true rendering everywhere your subscribers open.

Four preview tiles of one email side by side: Gmail on Android, Gmail dark mode, Outlook, and a purple tile reading +117 more previews for iPhone, iPad and Samsung
Gmail inbox view preview showing the from name Monstie Money, the subject Welcome to Monster Money and the preview text that follows it, timestamped 9:38 AM
The pre-open preview

The inbox view decides whether they open at all

Before anyone reads a word, they see the inbox line: your from name, subject line and preview text. Inbox Monster previews that inbox view the way it renders at Gmail, Outlook, Yahoo Mail and Apple Mail, so a truncated subject line or a preview-text fallback pulling the wrong copy never slips out to millions of subscribers.

AI previews

See the summary before your subscriber does

AI assistants now summarize the inbox, and that summary is the first impression. Inbox Monster previews how Apple Intelligence, Google Gemini and Microsoft Copilot interpret your email, so you can fix a misleading AI summary while you can still change the copy, not after it goes out.

Three AI inbox summaries of the same email as written by Apple Intelligence, Google Gemini and Microsoft Copilot, each pulling out different offer details
Live preview playing an animated MonstieCard email on iPhone 15 Mail, with a playing indicator, scrub bar and an animated GIF label
Live previews

Bring your dynamic content to life

Live previews play your GIFs, animations and interactive content through instead of freezing on a static frame. Get a short video clip of the inbox experience on key devices, so you can optimize your fallbacks.

In-line translation

75 languages, one creative project

Save countless hours and eliminate long production times with Inbox Monster's Template Translation. Translate live text with one click and generate and store as many language versions as you'd like. All diagnostics run immediately, so content renders properly on all relevant devices.

Template translation view with the Japanese email HTML in the code editor beside its rendered preview, and a language menu listing eight languages plus 67 more

By the numbers

90+

Mail systems monitored worldwide, so you see how you land across every meaningful inbox provider.

6B+

Spamtrap hits monitored monthly, one of the largest signal networks in the industry.

30%

Up to a 30% increase in inbox placement within 30 days of using the Deliverability Suite, for senders experiencing issues.

Inbox Monster mascot

Great software, previews load quickly. Wide range of email clients on various devices. Full thumbnail button makes it so much easier to glance through all previews on one screen.

Verified G2 user
Financial services

Go deeper on email previews

Free resources from our email experts.

Inbox Monster Custom QA: Email QA That Plays By Your Rules

Inbox Monster's Custom QA empowers teams to tailor their email testing to their brand's unique needs.

Read the guide
AI and the Inbox: How to Optimize Emails for Summaries and Extractions

Apple, Gmail and Yahoo are rewriting your emails with AI. Learn how inbox summaries and extractions work—and how to optimize for them.

Read the guide
Dark Mode QA guide thumbnail
The Monster Guide to Dark Mode QA (for Non-Designers)

Spot Dark Mode rendering issues fast. A non-designer's cheat sheet to QA, flag fixes and keep your emails looking sharp.

Read the guide

Explore more email goodness

Email Deliverability

See where your email actually lands, from inbox placement to sender reputation and blocklist monitoring.

Check it out
Expert Services

Proactive deliverability support so you land in the inbox, not the spam folder.

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SMS

A single snapshot of how your text messages actually land with carriers.

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Research Suite

Curate creative trends and organize emails in one collaborative workspace.

Check it out

Find your email rawwwr

We can walk you through the Creative Suite and run one of your real email campaigns through previews so you can see it in action.

Talk to an email expertSee pricing

Frequently asked questions

Straight answers from our email experts.

How many email clients and devices can I preview?

120+ modern clients and devices, covering Microsoft Outlook, Gmail, iPhone, Android and Samsung in light and dark mode.

Can I preview how my email looks in the inbox before it's opened?

Yes. Inbox Monster previews the inbox view, including your from name, subject line and preview text, the way it renders at Gmail, Outlook, Yahoo and Apple Mail, so you know how the send looks before anyone opens it.

Does Inbox Monster show how AI summarizes my email?

Yes. You see how Apple Intelligence, Google Gemini and Microsoft Copilot summarize your email before you send, so the AI preview your subscribers see is never a surprise.

Can I preview animated GIFs and interactive content?

Yes. Live previews play your GIFs and interactive content through, so you can check the frame rate and the real experience, not just a static snapshot.

How do I get my email into Inbox Monster?

Four ways: forward it to a send-to address from your ESP, upload an HTML or text file, paste your HTML directly or enable an ESP integration for a bidirectional sync.

Is there a free email preview tool?

Free email preview tools exist, but they usually cover a handful of clients and skip dark mode, AI previews and live rendering. Inbox Monster previews across 120+ modern clients and devices with unlimited seats, so your whole team can work from the same previews at no per-user fee. Talk to an email expert to see it on your own sends.

Can I edit my email inside Inbox Monster?

Yes. You can edit the HTML directly or use Easy Edit to click an element and change the image, alt text, link or copy. Save it as a new version and re-run the inbox previews. You can roll back to any earlier version.

Does Inbox Monster work within Salesforce Marketing Cloud?

Yes. Inbox Monster's Chrome Extension brings the full preview list, version control and side-by-side comparisons right into Salesforce Marketing Cloud, and renders AMP script dynamic content. This Chrome Extension also supports Twilio SendGrid and Iterable.

What is an email preview tool?

An email preview tool renders your email the way it will actually display across the many clients and devices your subscribers use, before you send. Because each client interprets HTML differently, the same email can look perfect in Gmail and break in Outlook. A preview tool shows your message everywhere it will land, from the inbox view to dark mode to how AI summarizes it, so you catch the breaks while you can still fix them.

Inbox Monster preview gallery showing one email rendered on Android Gmail and Android Gmail dark mode, with a teammate's cursor labeled Erwin S. and more previews behind.