A companion for iPhone, Apple Watch, Mac and the web
At the doctor’s, with a client, over coffee: ask it to listen. Lenn keeps what matters, follows up on your promises and answers when you need it. Like an attentive, honest friend.
Lennto Margaret · 5:05 pm
Dr Patel said to take your aspirin in the morning, not at night.
Lennto Karim · 8:50 am
You’re seeing Lucy Chen at 10. Last time, she was hesitant about the price.
Lennto Maya · 9:12 pm
You made three promises today. Shall we go over them?
Three verbs
That’s all there is to learn. No folders, no tags, no settings to understand before you start.
1Listens
One gesture: the Action button on your Watch, the big button on your iPhone, the menu bar on your Mac. While it listens, you can see it.
2Remembers
Every conversation becomes a moment: a clear title, the gist in a few lines, key points, people and promises. The transcript stays in the background, if you need it.
3Helps
It answers and shows where the answer comes from, reminds you of your promises and prepares your meetings. If it disagrees, it tells you. If it doesn’t know, it says so.
Three stories
At the cardiologist’s, between two clients, on the wrist. Three people guide every choice we make.
Margaret, 78 · iPhone
Margaret goes to her appointments alone. One tap on Listen, and Lenn listens with her. In the evening, she asks what the doctor said. It answers simply, out loud if she likes, and shows where the answer comes from.
Karim, 34, sales · Mac and iPhone
When his call starts, Lenn offers to listen, never without his say-so. After each meeting, Karim finds who, what, the promises and the next step. If he wants, Lenn prepares him every morning.
Maya, founder · Apple Watch
One press of the Action button, and Lenn listens, even with no iPhone nearby. Another press marks what matters. In the evening, Lenn goes over the day with her.
How it works
Tap Listen, or press the Action button on your Watch. An indicator stays on while Lenn listens, and it reminds you to let the people around you know.
Look at the person, not your phone. If something matters, tap Mark: Lenn brings the last 30 seconds to the front. A photo of the prescription or the whiteboard joins the moment.
When you stop, Lenn writes to you with what it kept. Later, ask it anything: it answers from your memories and points to the exact passage.
Voice
A real conversation, out loud. You can interrupt: it keeps listening while it speaks. It’s the same Lenn as in writing, with the same memory and the same honesty.
Voice runs on OpenAI’s GPT-Live. Lenn’s memory and personality stay on your server or on Lenn Cloud.
Trust
Lenn hears important things. It treats them with the respect you expect from a friend.
While listening, an indicator stays on screen: lock screen, Dynamic Island, Watch face, Mac menu bar.
Lenn listens only when you ask. When a call starts on your Mac, it offers; it never decides for you.
Lenn reminds you to tell the people around you that it helps you remember. Recording laws vary by country and region: in many places, everyone must agree.
Your memories live on your own server, or on Lenn Cloud. You choose.
A complete export in an open format: moments, original audio, photos, people, promises. And deletion, whenever you want.
Your memories are for you alone. They are never sold, nor used to train AI models.
Open source
The server and the web app are under the AGPL-3.0 licence, the Apple apps under the MIT licence. Install Lenn at home, paste your keys into the setup assistant: it’s your own Lenn, with no subscription.
git clone https://github.com/Synapsr/lenn.git && cd lenn
cp deploy/.env.example deploy/.env # fill in 3 values
docker compose -f deploy/compose.yaml up -d --build
Then open your server’s address: the assistant creates your account and helps you paste your Groq, Anthropic, OpenAI and Hugging Face keys.
Lenn Cloud
The same apps, hosted for you, with no key to create. 14 days to try it, no commitment.
All of Lenn, on your server. You pay your AI providers directly, at their prices.
$0forever
Free and open source
To keep track of your appointments and your days.
$9per month
plus tax where applicable
For people with back-to-back meetings.
$19per month
plus tax where applicable
US dollar prices exclude tax. Any applicable sales tax is added at checkout, depending on where you live.
14-day free trial, no commitment. Cancel any time.
Questions
No. Lenn listens only when you ask, with one gesture: the Listen button, the Action button on your Watch or the menu bar on your Mac. While it listens, an indicator stays visible. When you tap Stop, it stops. There is no background or hidden listening mode.
Yes, when the people present know and agree. Laws on recording conversations vary by country and region: in many places, everyone must consent, and you must follow the rules where you are. The simplest way: say it at the start, in your own words. Lenn reminds you every time, and our guide Listening with respect has ready-made sentences.
Where you decide: on your own server if you install Lenn yourself, or on Lenn Cloud if you’d rather install nothing. Either way, you can export everything in an open format, and delete everything.
No. Lenn relies on AI providers to transcribe and understand your moments (Groq and Anthropic, and OpenAI for voice), through business offers that don’t train their models on your data. We don’t sell your data and show no ads. Details are in our privacy policy.
No. Lenn reminds you what your doctor said, word for word if needed, and helps you prepare your questions. It never makes a diagnosis and never changes a treatment. When in doubt, call your doctor.
It can happen. That’s why every answer shows the moment it comes from: one tap, and you hear the exact passage again. When it doesn’t know, it says so.
It’s the same Lenn. Self-hosted, it runs on your server, for free, with your own keys at the AI providers. Lenn Cloud is the hosted version: nothing to install or configure, from $9 a month.
iPhone, Apple Watch and Mac, with native apps coming soon to the App Store, and the web app, which works in any recent browser, Windows and Android included. Android and Windows apps will come later.
Yes. Lenn is the default name: give it any name you like, pick its colour among six, its voice, and whether it speaks to you formally or casually.
English and French, in writing and out loud. More languages will follow.
Download
One companion: what you tell it on your Watch, you find again on your Mac.
iOS 26 and watchOS 26
Coming soon to the App StoremacOS 26, in the menu bar
Coming soonIn your browser, Windows and Android included
Open the web app