The operating system for email marketers.
A dozen free tools and a full pre-send checker today — growing into the workspace that keeps every email your team sends on-brand, accessible and consistent. Private by design, and running in your browser, priced for the UK.
Live preview across Gmail, Outlook & Apple Mail.
One place, not four
Stop paying for a testing suite, a deliverability tool, a verifier and five open tabs. One toolbox, one login.
Private by design
Campaigns and lists are checked in your browser. Nothing is uploaded unless you choose to — GDPR-native, UK-first.
A fraction of the price
The quality of the tools you already pay for, without the enterprise-only price tag. We undercut the incumbents on purpose.
The pre-send checker
Paste any campaign and get an instant readiness score — the one check that bundles all the others into a single go/no-go before you hit send.
A dozen free tools, one tab.
Every tool runs privately in your browser — no signup to use them, nothing uploaded. Filter to what you need, or browse them all.
Subject line tester
LiveLength, spam words, emoji and cut-off points.
Subject line bank
Live50+ subject ideas — swap in your brand and test.
Preheader optimiser
LiveThe most underused space in the inbox, done right.
Inbox preview
LiveSee it across Gmail, Outlook and Apple Mail.
Read time & readability
LiveWord count, reading ease and read time.
Plain-text generator
LiveClean plain-text version of any HTML email.
Spam checker
LiveScore trigger words, caps and links in your content.
Send-time optimiser
LiveThe right window for your audience and email type.
List & data cleaner
LiveDedupe, normalise and validate your list.
Case converter
LiveBulk lowercase, UPPERCASE, Title and Sentence case.
First & last name splitter
LiveSplit full names into first and last name.
UTM builder
LiveTrackable links with email best-practice defaults.
From toolbox to your team's email standard.
The free tools are the front door. Behind them, Mailfois is becoming the place teams keep every email on-brand, consistent and accessible — governance, not just guesswork. Here's what's coming to Pro.
Brand Guard
ComingLike a linter for email — every campaign scored against your brand's own rules before it goes out.
Brand Kit
ComingYour colours, type, spacing and CTAs made machine-readable — one source of truth the tools enforce.
Brand Vault
ComingYour guidelines, tone docs and templates stored and previewed right in the app — no more 100 tabs.
AI copilot
ComingAn assistant that understands your audience and brand and refines your copy. It assists — never sends.
Get it right, not just sent.
Practical, evergreen guides for UK senders — deliverability, compliance and the craft of getting opened.