Terminal Hell Joy!Mantel. The lightweight macOS terminal alternative for agentic coding with per-project colors and icons.

Terminal Hell is what happens when you run multiple AI coding agents across projects. All your windows look the same. You Cmd+Tab between them, can't tell which is which, and spend more time managing windows than building. The term emerged as tools like Claude Code pushed developers and non-developers into the terminal at scale. TechCrunch called it the shift to the 'Agentic CLI Era.' Mantel exists because of this shift.

AI coding has moved to the terminal. Fast. By early 2026, Claude Code alone had 115,000+ active developers. People run multiple agents in parallel across projects, and the constant context switching is a real problem. The terminal simply wasn't built for this kind of multitasking.

Anyone who works across multiple projects in the terminal but doesn't want to learn tmux or configure a power-user setup. Product managers running Claude Code, founders vibe-coding their MVP, developers who just want things to work. If you're not a terminal power user but still live in the terminal now, Mantel is for you.

Mantel is the German word for coat or cloak. The idea is to wrap your terminal in something colorful. That's exactly what Mantel does, and what the icon shows.

It's a lightweight terminal app that uses your default shell. zsh, bash, fish, whatever you have configured. Everything works like you're used to. Mantel just adds project-aware visual identity on top.

Those are full-featured power terminals with split panes, GPU rendering, and hundreds of settings. Mantel is a simpler alternative. It focuses on one thing: making your terminal project-aware with colors, names, and icons. No learning curve, no complexity.

Those tools help you run and coordinate multiple AI agents. They're orchestration layers, often built on tmux. Mantel solves a different problem: making your terminal windows visually distinct. You can use Mantel alongside those tools.

Mantel is free during the Beta period.

Mantel requires macOS Big Sur (11.0) or later. It runs natively on both Apple Silicon (M1, M2, M3, M4) and Intel Macs.

Yes. Mantel uses your default shell. zsh, bash, fish, or whatever you have configured. It's a wrapper, not a replacement.

No. Mantel auto-generates a unique color for every directory based on its name. For custom colors, icons, or names, run mantel init in your project folder. Takes seconds.

Mantel creates a .mantel/ folder in your project directory with a config.json and an optional icon. You can commit it to version control so your whole team gets the same project identity. Or add it to .gitignore if you prefer to keep it local.

No. Themes change colors statically. Mantel automatically detects which project you're in and adapts the color, icon, and info bar dynamically per window and per tab, in real time. No manual switching needed.

Run Claude Code in Mantel. Each project gets its own color and icon, so you can run multiple Claude Code sessions in parallel without confusing them. Add your dev server in a background tab and get notified when tasks finish.

Mantel is built by Robert Clemens, a software developer and founder of 83 Ventures, a company that builds and invests in digital businesses. Follow @dubtor on X.