Hugging Face
Run on your own infrastructure.
Download the weights, adapt the model and build on it. You choose the hardware and where your audio is processed.
Introducing Klang Pianissimo
Pianissimo.
Swedish speech-to-text at 3,600× realtime.
Klang Pianissimo is an open speech-to-text model for Swedish, fine-tuned from NVIDIA’s Parakeet v3. It achieves a 4.5% word error rate on Common Voice and transcribes an hour of audio in one second.
Try Pianissimo
Try transcribing Selma Lagerlöf, or try the model on your own audio.
Connecting to the model…
Silvergruvan
0:0033:36
Or try your own audio
Drop a file onto the player. Up to 90 minutes. Audio is sent to Klang for transcription.
Small model.
Big difference.
Pianissimo achieves word error rates comparable to KB-Whisper large, at 64 times the speed.
Speed and accuracy in one picture
Faster to the right. Fewer errors toward the top.
Scroll sideways to see the full chart.
60 hours of audio.
In one minute.
1 second
to transcribe an hour of audio
One tile = one hour of audio
Get Pianissimo.
Pianissimo is an open model, built for sovereignty. Run it on your own infrastructure or use it through our partner Berget AI. You choose where your audio is processed.
You choose where the model runs.
European AI needs models that others can build on. Open weights let you run Pianissimo locally, choose a European provider and switch as your needs change.
What’s new in Pianissimo.
Custom vocabulary. List names and terms so they are spelled right more often.
MLX and ONNX versions, including quantized variants.
Pianissimo launches with open weights.
We keep improving Pianissimo. Tell us what you’d like us to add.
Send feedbackBuilt with Pianissimo.
Chrome extension
Pianissimo for Chrome
Transcribe audio files and microphone recordings right in Chrome. Your audio stays on your computer.
Open source
OSTT
Dictate with a keyboard shortcut and use the text in your apps or terminal. OSTT uses Pianissimo through Berget AI.
Open source
Mindtalk
Hold a key, speak and get the text in any app on your Mac. Mindtalk uses Pianissimo for Swedish and everything runs locally.
Mac app
Aloud
Dictate in Swedish right on your Mac, without the cloud. Aloud lets you choose Pianissimo as its speech recognition model.
Open source
Sagascript
Press a shortcut, speak and get the text in any app on Mac or Windows. Sagascript uses Pianissimo for Swedish and your voice never leaves the computer.
Open source
Pianissimo Meet
Transcribe Teams and Zoom meetings in real time, locally on Windows. Pianissimo Meet is built on Pianissimo and sends no audio to the cloud.
Prototype
Real-time transcription
Transcribes Swedish conversations as they happen and keeps track of who says what. The prototype uses Pianissimo through Berget AI.
iPhone app
SnickSnack
Transcribe calls, meetings and interviews in Swedish right on your iPhone and get a summary. SnickSnack uses Pianissimo and everything stays on your phone.
Mac app
Speak.
Speak. is an app for both dictation and meeting notes on the Mac that Anthon Bäckström built for personal use, on Pianissimo. All audio and all text stays on the computer, nothing is sent to the cloud.
Prototype
Social Transcript
Record a conversation and get a draft in templates such as BBIC, IBIC and ASI, ready to review. Social Transcript uses Pianissimo and a local language model, so everything runs on the computer.
Mac app
Sæga
Hold a key, speak and the text lands where your cursor is. Sæga runs Pianissimo on the Mac's Neural Engine and all audio stays on the computer.
Windows app
Avskrift
Meetings, dictation, file transcription and de-identification in one program for Windows. Avskrift can run Pianissimo and everything stays on the computer.
Mac app
Parlissima
Dictate in Swedish on your Mac with a click on your new friend, the penguin. Parlissima uses Pianissimo and everything runs locally.
Web app
Kompis
Rehearse real conversations in Swedish, by voice or text, if you understand the language but hesitate to speak. Kompis uses Pianissimo to understand what you say.
What are you building?
We’d love to see your project and share more ways to use Pianissimo.
AI for conversations that matter.
Klang makes your conversations searchable and usable - with transcriptions, summaries, and insights. Built in Europe, with trust at its core.