Transcribe voice notes locally — no cloud, no API bills, no privacy tradeoffs.

Run a Whisper-powered transcription API on your own hardware in minutes. Your voice notes never leave your machine, and you stop paying per-minute fees to transcribe them.

The Problem

Your voice notes shouldn't require a cloud subscription

Developers want to convert voice notes to text for AI agents but lack a private, cost-free on-prem transcription solution. Every cloud service means sending sensitive audio to third parties, accumulating per-minute fees, and accepting latency tradeoffs that slow down your workflow.

Why developers choose Vesper

Transcribe voice notes to text in seconds

Entirely on your own machine, with Whisper-powered accuracy

Eliminate per-minute API costs

One flat container, yours forever — no subscription tiers

Keep every voice memo private

Zero data leaves your network, ever

Drop into any agent workflow

Simple REST API for seamless integration

How it works

Pull the Docker image

Self-contained Docker image with a pre-trained Whisper model ready to run on your machine

Start the API

HTTP REST endpoint accepts audio files (mp3, wav, m4a) and returns transcribed text instantly

Transcribe in one command

Simple CLI for quick testing, configurable model sizes (tiny/base/small) to balance speed and accuracy

Frequently asked questions

How does it compare to Whisper API from OpenAI?

Vesper runs the exact same Whisper models locally — you get identical accuracy without sending audio to any third party or paying per-minute fees.

Do I need a GPU?

No. Vesper runs on CPU by default and adds GPU acceleration as an optional upgrade. Works fine on a laptop for personal use.

How do I integrate it with my coding agent?

Vesper exposes a simple REST endpoint. Point your agent or workflow tool at localhost:8000, send an audio file, get back text. No config required.

How long does setup take?

Pull one Docker image and run one command. You're transcribing in under five minutes.

Stop paying for what you can run yourself

Join the waitlist and be first to run Vesper locally