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The default `font_fallbacks` list was macOS-only -- Menlo, Hasklug Nerd Font Mono, Maple Mono NF CN, Apple Color Emoji. Fallbacks resolve by family name against installed fonts, so off macOS the whole chain matched nothing and every glyph the primary lacked was left to the platform's own cascade. Bundled Hack maps 1548 codepoints and zero ideographs, so on Windows that was every Chinese character in every pane, and every emoji. The fall-through is not only a matter of which face you get. `element.rs` pins each wide cell to `2 x cell_width`, and Hack advances 0.60205em, so a two-column slot is 1.2041em -- while every stock CJK face (Microsoft YaHei, PingFang SC, Noto Sans CJK) advances 1.0em. `force_width` left-aligns, so the ideograph hugs the left of its slot and the remaining 0.2em shows up as a gap on the right of every character. Measured on Windows at font_size 15: left bearing 1.49px, right bearing 4.90px. Branch the defaults per platform, keeping Maple Mono NF CN first everywhere -- 0.6em Latin, 1.2em CJK, the one exact two-cell fit against Hack (bearings 3.06px / 3.62px, ink centered). It stays referenced by name only, never bundled, at ~20MB per weight. Changing `Config::default` alone would reach nobody who already has a `config.json`, which is every existing user. So `fallback_chain` appends the platform's stock faces the same way it already pins Hack: a fallback is consulted only after everything ahead of it has missed, so appending can never displace a face the user chose, and the file is never rewritten. Verified by driving two builds against one config naming only absent macOS faces: before, the CJK line differed from an explicit Microsoft YaHei chain by 3571 pixels (the cascade picked something else); after, it is pixel-identical.
tty7
A terminal workbench: shells, sessions, SSH, coding agents.
Pure Rust · GPU rendering on Zed's gpui · VT core from Alacritty
English · 简体中文
Why
- Fast — ~2× the throughput of Alacritty, Ghostty, or Kitty (benchmarks)
- Sessions persist — quit or reboot; your shells keep running, no tmux
- Editor-grade input — completion, syntax highlighting, history search built in; zero config for zsh, bash, fish, PowerShell
- Agent-aware — recognizes Claude Code & co. in a pane: status, notifications, session resume
Install
Native builds for each platform on Releases:
| macOS | …-macos-arm64.dmg · …-x86_64.dmg |
drag into Applications |
| Windows | …-setup.exe · portable ….zip |
|
| Linux | …-x86_64.AppImage |
chmod +x and run — x11/wayland libs bundled |
What's inside
| Input | ghost suggestions from history · explained tab completion · syntax highlighting · multi-line editing · click places the caret · ⌃ R fuzzy history |
| Window | tabs & splits · ⌘ P palette · ⌘ F scrollback search · eight themes · IME |
| Coding agents | per-pane agent detection (~17 CLIs): status dot, notifications, branch + diff, resume after reboot, tray icon that signals "needs your input" |
| SSH | native russh stack: profiles with keychain secrets, SFTP panel, port forwarding, jump hosts |
Details for every row: docs/features.md. Keybindings: ⌘ , opens Settings — browse and remap everything, tmux preset included (full list).
Benchmarks
Same machine, same day, same 155×40 grid — Apple M1 Pro, macOS 26.3.1, five-run averages (2026-07-04):
| tty7 | Alacritty | Ghostty | Kitty | |
|---|---|---|---|---|
Plaintext IO — 11 MB cat (lower = better) |
95 ms | 239 ms | 179 ms | 185 ms |
| DOOM-fire frame rate (higher = better) | 888 fps | 485 fps | 552 fps | 617 fps |
| Cold-launch memory | 116 MB¹ | 105 MB | 128 MB | 130 MB |
¹ GUI 105 MB + the persistent daemon 11 MB.
Methodology and one-command reproduction: scripts/bench/.
Built on gpui and alacritty_terminal · Apache-2.0 · Discord · Changelog