Halcyon

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Changelog

Everything we ship, in the order we shipped it. Follow the RSS feed or subscribe for a monthly digest.

2.0.015 March 2026

A full rewrite

Half the memory, twice the throughput, and a plugin API we're finally willing to commit to long term.

Added

Plugin API with a stable, versioned surface
Multi-window sessions that survive a restart
Native arm64 builds for Apple silicon and Linux

Changed

Rendering moved off the main thread — input stays responsive under load
Configuration is now TOML; existing JSON auto-migrates on first run

Fixed

Memory growth during sessions longer than about six hours
Focus loss when reattaching an external display

Breaking

The halcyon.json format is removed. Run halcyon migrate once — it rewrites your config in place and keeps a backup.

1.9.22 February 2026

Stability pass

Fixed

Crash when opening a file with mixed line endings
Search results occasionally skipping the final match
--watch missing changes on network volumes

1.9.011 January 2026

Workspaces

Added

Named workspaces with independent settings
halcyon open <workspace> in the CLI

Changed

Startup is roughly 40% faster on cold launch

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