Windows
Windows 10 (2004) or newer, 64-bit. One permission: the microphone. Nothing else to install — Windows hands the other person’s sound to the app on its own.
Installation guide
From the file to your first conversation.
Ten minutes, most of it waiting for a download. Below is every step in order, with each dialog named — including the two your operating system will throw at you and the one setting that differs between Windows and macOS.
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Get the right file
Windows: one installer. macOS: Apple Silicon or Intel — the Apple menu, “About This Mac”, tells you which. Both stand on the download page.
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Install it
Windows: run the installer and follow it. macOS: drag Thalassa into your Applications folder, then open it with a double-click.
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Let it listen
Your computer asks whether Thalassa may use the microphone — that is your own voice. On a Mac it asks a second time, for the sound your Mac plays — that is the other person. Allow both, or Thalassa hears only half of the conversation.
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Sign in
Create an account in the app, or use Google or Microsoft. The free trial starts here, in the app — not on the website.
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Try it on yourself
Add your documents, wait for the bar to finish, then start a conversation and talk to yourself for a minute. Better here than in a client call.
macOS
macOS 11 Big Sur or newer. Two permissions: the microphone, and the sound your Mac plays. From macOS 14.2 that is all. On macOS 11 to 14.1 the app adds BlackHole, a free audio device, and walks you through it — about three minutes, once.
First sign-in and the trial
The account is created in the app, not on the website. The trial begins the moment you sign in, and nothing is charged to start it. Bought a plan first? Sign in with the same address and it is already attached — there is no licence key to enter.
What is actually happening
Four things worth understanding rather than clicking through.
Thalassa listens to two things at once. The system audio — whatever your speakers are playing — is the other party. The microphone is you. It needs both, because knowing who asked is what makes an answer an answer and not a transcript. On Windows the system audio is available to any application; on macOS it is a protected resource, which is why the second permission exists.
Apple treats them as different things, and granting one does not grant the other. If Thalassa hears you but not the person you are talking to, it is almost always the audio-capture permission: System Settings > Privacy & Security > and grant it there. The application says which of the two is missing rather than reporting a generic audio error.
No sound from the other party is almost always the audio permission on macOS or the wrong output device on Windows. No answer usually means no knowledge base has finished indexing yet. The window appearing in a screen share means the whole screen is being shared on macOS 15.4 or newer — share a single window instead. Sign-in failures are usually a corporate network blocking the callback. The help page walks through each one.
Installation questions
What people ask while they are doing this.
Do I need administrator rights?
On macOS, no — dragging the app into Applications is enough, and you can install it into your own user folder instead. On Windows the installer will ask for them; if your machine is locked down, the portable folder build works without them. Write to support@thalassa-consulting.com and we will send it.
Where do my documents end up after installation?
In your user folder, on your machine. They are indexed and searched there. Nothing is uploaded — except a scanned PDF, whose pages go once to our backend for text recognition, and that can be switched off in the settings.
Can I install it on two computers?
Yes. The licence follows the account, not the machine. Running two conversations at the same time on one account is what it will not do.
How do I remove it completely?
Windows: uninstall like any other application. macOS: drag it to the trash. Both leave the knowledge base in your user folder — delete that folder too if you want it gone. Deleting the account itself is a separate step in the application's settings.
Get the file
Current version, straight from here. Windows is one installer; on a Mac, Apple Silicon unless your machine is an older Intel one — the Apple menu, “About This Mac”, says which.