# Inbox preview vs. Litmus: free email testing in Gmail and Outlook | Letterhead Source: https://www.tryletterhead.com/compare/litmus.html _Compare · Free tools_ # Inbox preview vs. Litmus Litmus is a full email testing suite. Inbox preview does one job for free: it shows your email in real Gmail and Outlook.com inboxes. Here's how to tell which one you need. Letterhead Inbox previewLitmus PriceFreeNot listed. Litmus's pricing page sends you to its sales team. SignupNoneAn account InboxesGmail and Outlook.com on the web, desktop and phone widthMany more email clients and devices Gmail clippingMarked on the screenshotSee Litmus LimitOne preview a dayDepends on the plan Best forA quick check that Gmail and Outlook.com show your newsletter the way you built itTeams that test across many clients and devices as part of a bigger workflow Litmus pricing as shown on [litmus.com/pricing](https://www.litmus.com/pricing), checked November 3, 2026. _Try it_ ## See your email in real inboxes. Paste your email's HTML and we'll photograph it in our own Gmail and Outlook.com test inboxes, on a desktop screen and at phone width, and tell you whether Gmail clipped it. Free, no signup. Email HTML Up to 102KB. Don't paste anything confidential: the email is sent to our test inboxes and stays there; the screenshots are deleted after a week. One preview a day. Preview in real inboxes _Choosing_ ## When the free check is enough If what you need to catch is Gmail's clip, broken images or a layout that falls apart in a narrow window, and your readers are mostly on Gmail and Outlook.com, a free preview in those real inboxes covers it. Pay for a full testing suite when you need to see many clients and devices for every send, or when testing is part of a bigger approval workflow for a team. ### Use it with the other free checks Run your HTML through [Preflight](../tools/preflight.html) for links, readability and weight, and check your sending domain's [DMARC](../tools/dmarc-checker.html), SPF and DKIM. All free, no signup. ## In Letterhead, the weight check runs while you write. The composer weighs every issue and shows what's making it heavy, so you can trim before Gmail clips it. The old wayIn LetterheadLearn that Gmail clipped you from a reader's reply.The composer weighs every issue and shows what's making it heavy, before you send.Trim the HTML by hand to get under the limit.Letterhead strips redundant styling from what it sends, so it goes out lighter than you wrote it. [Book a test drive](../lp/test-drive.html) _FAQ_ ## Questions about Inbox preview and Litmus Is Inbox preview really free? Yes. No signup, one preview a day. How much does Litmus cost? Litmus doesn't list prices on its site; its pricing page sends you to its sales team. Ask Litmus for a quote. When should I pay for Litmus instead? When you need to see many email clients and devices for every send, or testing is part of a bigger team workflow. Which inboxes does Inbox preview cover? Gmail and Outlook.com on the web, on a desktop screen and at phone width. Not the phone apps, desktop Outlook or Apple Mail. _More free checks_ ## Check the rest before you send. - [**Preflight**SPF, DKIM, DMARC and a content check, together](../tools/preflight.html) - [**SPF checker**Missing, duplicate and too-open SPF records](../tools/spf-checker.html) - [**DMARC checker**Your policy, and what Gmail, Yahoo and Outlook require](../tools/dmarc-checker.html) - [**DKIM checker**Find your selector and check the key](../tools/dkim-checker.html) - [**Gmail clipping checker**Will Gmail cut your email off at ~102KB?](../tools/gmail-clipping-checker.html) - [**Inbox preview**Your email in real Gmail and Outlook.com inboxes](../tools/inbox-preview.html) - [**Ghost Finder**Is this address real, or a ghost?](../tools/ghost-finder.html) - [**Email list cleaning**Keep bad addresses off your list](../tools/email-list-cleaning.html) - [**Email verifier**Check if an email address is valid](../tools/email-verifier.html) - [**Email spam test**Your email and domain, checked before you send](../tools/email-spam-test.html) - [**Outlook email preview**See it in a real Outlook.com inbox](../tools/outlook-email-preview.html) [All free tools](../tools/) [See it in Letterhead →](../lp/test-drive.html) × The Letterhead Brief Don't fill this out if you're human: Email address Subscribe One email a week. Unsubscribe anytime. By submitting, you agree to our [Privacy Policy](../legal/privacy-policy.html). [Or book a 15-minute test drive →](../lp/test-drive.html) Not now You're on the list. The Brief lands once a week. Want these checks running on your own newsletter? [Book a test drive →](../lp/test-drive.html)