Credits and licences

Speaking and listening

• Kokoro-82M

  Apache-2.0. The voice that reads to you, including the “Heart” voice in the sample on our home page. The ONNX export is by onnx-community; the word-to-sound data uses misaki, also Apache-2.0.

  Kokoro-82M · misaki

• OpenAI Whisper and whisper.cpp

  MIT. Speech recognition on the phone: the Whisper base.en model (© 2022 OpenAI) run by whisper.cpp (© The ggml authors).

  Whisper · whisper.cpp

• ONNX Runtime

  MIT. Runs the voice and the listening models on the phone.

  ONNX Runtime

• Silero VAD

  MIT. Hears when someone is speaking and when they stop.

  Silero VAD

• SpeechBrain ECAPA-TDNN

  Apache-2.0. Makes the small voiceprint, if you teach Lahdo your voice.

  spkrec-ecapa-voxceleb

• openWakeWord-style models

  Apache-2.0. The “Hey Lahdo” wake word. Its building blocks are openWakeWord’s spectrogram model and Google’s speech embedding model, both Apache-2.0. The final stage was trained for Lahdo with synthetic voices (Kokoro, and Piper voices from public-domain and CC BY 4.0 data including LibriTTS, Zen et al. 2019). openWakeWord’s own ready-made wake-word models are not used.

  openWakeWord · Google speech embedding

Software, drawing and fonts

• Rough.js and Excalidraw

  MIT. The hand-drawn Sketch look is written from the ideas of Rough.js, and its colours come from Excalidraw’s palette. No Rough.js code is copied.

  Rough.js · Excalidraw

• GRDB

  MIT. A database library inside the app.

  GRDB.swift

• Excalifont

  SIL Open Font License 1.1. The hand-drawn letters of the Sketch look, here and in the app. © 2024 Excalidraw.

  Excalifont · Licence text

• Outfit

  SIL Open Font License 1.1. The Lahdo word mark and the scripture text in the app. © 2021 The Outfit Project Authors.

  Outfit

Bible text and services

• World English Bible

  Public domain. The words of John 3:16–17 in the audio sample on our home page.

  ebible.org/web

• YouVersion Platform

  Used under its own terms. Bible text in the app is fetched from the YouVersion Platform. Each translation carries its own copyright notice, shown in the app.

  YouVersion Platform

• Anthropic Claude, through OpenRouter

  Used under their own terms. Understands the words of a request when Lahdo cannot, if you leave “Smarter understanding” on.

  Anthropic · OpenRouter

• Open Bible topical index

  CC BY 4.0. Helps Lahdo find verses about a topic.

  openbible.info