Works inside Outlook and Teams on Windows
It's not what you say. It's how you say it.
Everyone's heard that line, usually just after they've pressed send. Cantis speaks up before you do. It flags what could cause a problem with the person you're writing to, and helps you adjust it.
Join now for an extra month free at launch.
For Windows, in Outlook and Teams only for now, and still in testing. Sign up to hear when it's ready, or get free early access to a beta version.
An example: an email or a Teams message is written, the Cantis light turns amber or red on one sentence, the coach explains why and suggests a rewrite, and Accept changes only that sentence.
You write
In Outlook or Teams, exactly as you do today.
Cantis checks
The light turns amber or red if a line might not suit the person you're writing to.
You decide
Click the light for the reason and a suggestion. Accept it, or reject it and keep your words.
The same email lands differently with each person who reads it.
Pick a face to see how a few words land with a client of four years, a client of two weeks, and a supplier who's already late.
Everyone on this page is made up. If one of the messages looks like something you sent at nine last night, that's a coincidence.
Everyone on this page is made up. If one of the messages looks like something you sent at nine last night, that's a coincidence.
Subject: Friday
Any update on this? I need it by Friday. Thanks, Sam
Gareth
Supplier. Account manager.
- Relationship health
- 52falling this month
- Relationship
- Eighteen months. Weekly while a project's running.
- Communication style
- Brief. Slower to reply once a thread's been chased.
- Situation
- The delivery's late. You've chased twice on this thread.
- What works well
- Saying once, plainly, what happens if it's late, and asking what would help.
Escalation
Red. Read this one again.
You've already asked twice on this thread. A third one-liner with a date in it looks like the start of a dispute, whatever you meant. Say once what happens if it's late, and ask what would make Friday possible.
Suggestion
“Friday is the last day I can take this without moving the board date. What would make Friday possible from your side?”
See it in the app
Tariq
Client. Joined as finance lead this month.
- Relationship health
- Too early to score. Four emails isn't a history yet.
- Relationship
- Two weeks. Four emails so far.
- Communication style
- Formal and complete. A greeting, full sentences and a sign-off, within a day.
- Situation
- Your first deadline together. You haven't chased him yet.
- What works well
- A reason with every request, and an easy way to answer.
Ambiguity
Amber. One thing to look at.
Tariq hasn't seen you chase anything yet, so “any update” will read as a complaint rather than a question. Say why Friday matters and make it easy for him to answer.
Suggestion
“Is there anything I can send over to help with this? Friday would give us a day in hand before the board pack goes out.”
See it in the app
Imogen
Client. Operations director.
- Relationship health
- 88steady
- Relationship
- Four years. You write most weeks.
- Communication style
- Short and informal. First names, two lines, the same day.
- Situation
- Nothing unusual. The last twelve threads closed without a chaser.
- What works well
- Putting the ask in the first line. She doesn't need the reason.
Nothing to raise
Green. Checked, nothing to raise.
You've swapped short emails for four years. She'll read this the way she reads all the others.
Suggestion
Nothing to raise. It's still your call whether to send.
See it in the app
It knows who you're writing to.
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With multiple names in the ‘To’ field, it allows you to choose which one to coach for.
Coaching is for one person at a time, so you choose which relationship it thinks about.
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If you want to know why, it tells you.
It explains why a message could come across badly with that person, so over time you learn it yourself. If you just want it right, accept the suggestion.
You won't have to change how you write.
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Write the way you always do.
In Outlook or Teams, the email you were going to send anyway. There's nothing to copy and paste, and no extra window.
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A small light shows the status.
Grey means nothing to raise yet. Blue means it's thinking. Green means it's checked and found nothing, and it's still your call whether to send. Amber or red means it's found something, and the number tells you how many.
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Accept the suggestion, or don't.
Accept swaps the flagged sentence for the suggestion. Reject keeps your words. If you want to know why, it tells you. Then you send it, or you don't.
It checks every message before it goes.
If it finds something, it names the problem and offers a better way to put it. Want to know why? It tells you. Just want it right? Accept the suggestion.
- The kind of problem.
- Why it matters to this person, and what to do.
- An example rewrite to try.
- Accept or Reject. It's your call.
On a day when you're tired, rushed or under pressure, a reply goes out sharper than you meant, or you answer while you're still annoyed. A bit of sarcasm to the wrong person feels good at the time and can turn into an HR dispute later. And sometimes a message with sensitive information goes to the wrong person.
Everyone makes mistakes.
Cantis is there to help stop those messages going out. It flags when a message could come across as hostile, defensive or going over someone's head, when it could cause an HR or legal problem, and when it doesn't suit how the person reading likes to communicate.
Who's it for?
You work for a business, and most of your day is messages: to your manager, your team, and the clients and suppliers the business depends on. Plenty of them go out at the end of a long day.
Sound familiar? Then Cantis can help.
- You read an important email five times before you send it.A green light means it's been checked and there's nothing to raise. That's time back, and fewer drafts called “final final v3”.
- You've been told your messages come across as blunt.And you meant nothing of the sort.
- English is your working language, not your first.A plain request in one country can read as rude in another.
- You've just started managing people.Or it's your first office job, and you're working out how to write to the people above and below you.
- There's one manager, or one colleague, who makes every message hard.Most people have had one.
- 44%of people in Great Britain had conflict at work in the past year, the highest Acas has ever recorded.Acas, How prevalent is individual conflict at work in Great Britain in 2025?
Early access to the beta is free. There'll be a free trial when it launches, and anyone on the waitlist gets an extra month free on top of it. We'll publish the price before then.
You run your own business. Most of what you send goes to the same few people, the clients, agencies and suppliers your work depends on.
Sound familiar? Then Cantis can help.
- A handful of clients decide whether next year happens.And you're often writing to them at the end of a long day, with nobody to read it over first.
- There's one client who makes every message hard.Most people have had one.
- You chase late payments and late work yourself.Cantis flags when a chaser could read as the start of a dispute, and suggests a way to put it that keeps the client.
- You find it hard to tell how people will take what you write.Some people read tone without thinking about it, and some don't. Cantis does that part for you, and tells you why if you want to know.
- Your clients' information passes through your inbox.Cantis flags when a message is about to send company information somewhere it shouldn't go.
- 18%of personal data breaches reported to the UK regulator in 2025 were an email sent to the wrong person. It has been the most common kind every year since 2021.ICO, data security incident trends, 2025
Early access to the beta is free. There'll be a free trial when it launches, and anyone on the waitlist gets an extra month free on top of it. We'll publish the price before then.
Your team sends hundreds of messages a day to clients, suppliers and each other. You usually only hear about the one that went wrong afterwards: the client who went quiet, the good person who handed in their notice, the complaint that ended up with HR.
- What it does for your teamIt works in Microsoft Outlook and Teams on your employees' computers. It gets to know the people each person writes to, flags when a message could be adjusted to suit how the reader likes to communicate, and flags messages that could cause an HR or legal problem. Your people decide what is sent.
- £28.5bnWhat it can save. Conflict at work costs UK employers this much each year, more than £1,000 for every employee.Acas, Estimating the costs of workplace conflict, 2021
- 2xPeople who had conflict at work were twice as likely to say they plan to leave (33% against 16%).CIPD, 2024
- £30,000+One study's estimate of the cost of replacing an employee on £25,000 or more, mostly the lost output while the new person gets up to speed.Oxford Economics for Unum, 2014
- A free team trialFree for up to 10 people while we test.
- What the business getsThe licences. What it doesn't get is set out under For your eyes only.
What poor communication costs.
In the study, more than a third of the emails were read the wrong way, by readers who were sure they had read them right.
Kruger, Epley and others, Journal of Personality and Social Psychology, 2005Seven in ten people at work spend a few hours or more every week on work caused by poor communication. The cause they named most often was different communication styles.
The Economist Intelligence Unit, Communication barriers in the modern workplace, 2018. A survey of 403 people at US companies, paid for by Lucidchart- 117
emails a day, and 153 Teams messages, for the average worker.
Microsoft, Breaking down the infinite workday, 2025
What happens to what you write
Cloud server, today
Your computer
On your computer, in development
Our server doesn't keep your message, and our AI provider doesn't train on it and deletes it within 30 days.
Fair questions.
Will it send, block or hold my messages?
Never. Nothing goes until you press send. Cantis doesn't have a send button and can't stop yours.
Does it use AI?
Yes. A language model reads the message and writes the coaching. What it looks for, and how it decides, is Cantis's own work: a list of the risks it looks for, a set of rules for what gets raised and when, guardrails on what it will suggest, and what it knows about the person you're writing to.
What will it cost?
There'll be a free trial, and anyone on the waitlist gets an extra month free on top of it. We'll publish the price before launch. Early access to the beta is free.
Who's behind it?
Cantis Ltd, a company registered in England and Wales.
When can I have it?
We're still building it. People with early access to the beta get it first, through the waitlist.
Be first to know, and get a free month.
Join now and you'll get an extra month free when Cantis launches, on top of the free trial. You can also ask for free early access to the beta. Places are limited. Tell us what you do.
You're on the list.
We'll write to you when your group opens.
Know someone who'd find it useful?
Questions before then? hello@cantis.ai