candela-desktop

Candela Desktop is a Flutter-based desktop application for managing LLM providers and visualizing distributed traces.

Features

Feature	Description
Provider Management	Add, configure, and switch between LLM providers
Trace Viewer	Visualize distributed traces with span details
Cost Monitoring	Track token usage and estimated costs per request
Secure Storage	API keys stored in the OS keychain (macOS Keychain, Windows DPAPI, Linux libsecret)
Dark/Light Mode	Adaptive UI with system theme detection

Installation

Download the latest release for your platform from GitHub Releases.

Platform	Format
macOS	.dmg
Linux	.AppImage
Windows	.exe installer

Provider Configuration

Candela Desktop supports multiple LLM providers:

• OpenAI — GPT-4o, GPT-4, GPT-3.5
• Google Gemini — Gemini 2.5 Pro, Gemini 2.0 Flash
• Anthropic — Claude Sonnet, Claude Haiku
• Ollama — Local models (auto-discovered)
• LM Studio — Local models via OpenAI-compatible API

Each provider is configured with:

• Display name and endpoint URL
• API key (securely stored in OS keychain)
• Model selection and parameters
• Optional proxy routing through candela-local or candela-sidecar

Trace Viewer

The trace viewer displays a waterfall view of distributed traces:

• Span hierarchy — Nested tree showing parent/child relationships
• Timing — Start time, duration, and TTFB for each span
• Token counts — Input and output tokens per LLM call
• Cost — Estimated cost based on provider pricing
• Attributes — Full span attributes including model, provider, and custom metadata

Development

git clone https://github.com/candelahq/candela-desktop.git
cd candela-desktop
flutter pub get
flutter run -d macos  # or linux, windows

Related

• candela-local — Local proxy that Desktop can connect to
• candela-server — Cloud backend for team features