A tiny always-on-top desktop widget that monitors your GLM Coding Plan quota — the 5-hour rolling window and the weekly allowance — so you don't get blindsided by a rate limit mid-session. Built with Avalonia 12 / .NET 10. Cross-platform (Windows / macOS / Linux).

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• Nested quota rings — outer ring = weekly allowance, inner ring = 5-hour rolling window, animated
• Auto-refresh — clickable refresh button plus automatic refresh every few minutes
• Light / Dark / System theme — Anthropic-style palette, with a card opacity slider so it doesn't block your desktop
• Bilingual UI — Chinese / English toggle
• Start-on-login — optional autostart (Windows registry / macOS LaunchAgent / Linux autostart)
• Quota notifications — optional desktop notification when a quota crosses an exhaustion threshold (default 80% used, configurable)
• Movable card — right-click for refresh / settings / quit; drag to move (position remembered)
• System tray — hide to tray keeps polling and notifications running; bring the widget back from the tray icon (or by launching the exe again). Only the tray/card "Quit" really exits
• Multi-monitor safe — if a monitor is unplugged and the card ends up off-screen, it is pulled back onto a visible display automatically

Reads quota from the GLM Coding Plan monitor endpoint (GET /api/monitor/usage/quota/limit) using your Coding Plan API key — the same call the official glm-plan-usage plugin makes. Two nested rings: outer = weekly, inner = 5-hour window. Clickable refresh button; auto-refresh every few minutes.

Settings & API key live under %APPDATA%\BrainFuel\ (Windows) / ~/.config/BrainFuel/ (Linux) / ~/Library/Application Support/BrainFuel/ (macOS).

git clone https://github.com/turinglambdaai/brainfuel.git
cd brainfuel

dotnet run

On first launch, paste your GLM Coding Plan key in the settings dialog.

If dotnet build/restore can't reach nuget.org (restricted networks), restore from the local package cache instead:

dotnet restore --ignore-failed-sources

Option A — download a prebuilt exe from Releases. The release workflow builds self-contained single-file exes for win-x64, osx-arm64, and linux-x64 — no .NET install needed on the target. (A manual run from the Actions tab also produces downloadable artifacts.)

Option B — build locally:

./publish.ps1                 # win-x64 (default)
./publish.ps1 osx-arm64       # macOS Apple Silicon
./publish.ps1 linux-x64       # Linux

Output goes to publish/<rid>/.

brainfuel/
├── App.axaml(.cs)            # Application definition / DI container
├── Program.cs                # Entry point
├── MainWindow.axaml(.cs)     # Main widget window (quota rings)
├── NotificationWindow.axaml(.cs)  # Desktop notification window
├── SettingsWindow.axaml(.cs) # Settings + API key dialog
├── Controls/
│   └── UsageRing.cs          # Reusable quota-ring control
├── Services/
│   ├── GlmUsageClient.cs     # GLM Coding Plan quota API client
│   ├── SettingsService.cs    # Settings / API key persistence
│   ├── AutoStartService.cs   # Start-on-login (Win/macOS/Linux)
│   ├── SingleInstanceActivation.cs  # Single-instance guard
│   ├── Strings.cs            # Localized strings
│   └── UsageModels.cs        # Quota data models
├── ViewModels/
│   └── MainViewModel.cs      # MVVM view model
├── publish.ps1               # Local self-contained build script
└── BrainFuel.csproj          # Project file

Licensed under the MIT License.