Surmiser is a JavaScript autocomplete primitive that adds Smart Compose–style predictive text to any input, working with React, vanilla HTML, and major UI libraries.

It runs a local, privacy-first prediction engine with a default phrase corpus, mobile gestures, keyboard shortcuts, and support for custom corpora and provider architectures (including remote APIs or LLMs). Installation is via npm, and usage is through React components/hooks or a vanilla attach function, licensed under MIT.