Decalyst vs Aider
Aider is an open-source CLI-first tool with no hosted service; you bring your own keys via env vars and pay your model provider directly. Excels at atomic git diffs and code coordination. No IDE, no GUI, no security scanner. Best for terminal power users with total control.
Pick Decalyst if:
You want a GUI IDE, built-in security scanning, or prefer not to manage LLM keys directly.
Pick Aider if:
You live in the terminal, want complete transparency on what Aider is prompting, and prefer open source.
| Dimension | Decalyst | Aider |
|---|---|---|
| Pricing model | Credits, $1 buys 500 credits, no feature gates | BYOK only, cost is what you pay your model provider (Claude, GPT-4, etc.) |
| BYOK LLM keys | Yes, zero markup on every tier | Yes, required, via environment variables, zero markup |
| Local model support | Embeddings local, generation hosted on DigitalOcean inference | Full support for local models via LiteLLM (Ollama, LM Studio, etc.) |
| Security scan on every diff | Yes, 20-point scanner included on Free | No built-in security scanner |
| IDE depth | Native desktop (Tauri 2 + Monaco) | Terminal / CLI only, no GUI IDE |
| Agent specialization | 9 named agents (Dispatch, Echo, Lens, Chuck, Scout, Nova, Forge, Hawk, Pixel) | Single code-generation agent, very strong at atomic git diffs |
| Telemetry | Opt-in only | Open source, no telemetry unless you enable debug logging |
| When to pick | You want a full-featured IDE, team collaboration features, security scanning | You want a pure CLI, total control over prompts and keys, local-only models |
Pricing
Aider has no hosted service or pricing; it is open source and free. You pay only your model provider (e.g. Anthropic, OpenAI). Cost depends on your token usage and which model you choose. Decalyst adds a layer: you pay credits ($1 per 500), which covers both inference and Decalyst infrastructure, with security scanning bundled in.
BYOK and key handling
Aider requires BYOK; you must set ANTHROPIC_API_KEY, OPENAI_API_KEY, or other env vars directly. Aider reads them at runtime with zero markup. Decalyst also supports BYOK (zero markup), but also offers managed billing if you prefer. Aider is more transparent: you control every key and every prompt.
Local vs hosted models
Aider has excellent support for local models via LiteLLM: Ollama, LM Studio, vLLM, etc. Run code generation fully on-device if you want. Decalyst runs embeddings locally but generation on DigitalOcean inference, prioritizing speed and quality over full privacy.
Security review on every diff
Aider has no built-in security scanner. Decalyst includes a 20-point security scanner on every diff, catching injection, XSS, secrets, and more. If security scanning is critical for your workflow, Aider requires manual review or external tools.
IDE depth and architecture
Aider is a CLI tool with no GUI; you interact via the terminal. It is incredibly powerful for git workflows and prompt coordination but has no rich UI. Decalyst is a native desktop IDE (Tauri 2 + Monaco) with a full editor, file explorer, and visual diff interface.
Telemetry and privacy posture
Aider is open source with no telemetry by default. Your keys and prompts are completely in your hands. Decalyst is a commercial product with opt-in telemetry. For maximum privacy, Aider (with local models) or Cline (with local models) beat Decalyst, though Decalyst is still privacy-respecting and optionally BYOK.
When to pick which
Pick Aider if you are a terminal power user who wants complete transparency and control over keys, models, and prompts. Pick Decalyst for a full IDE experience, automated security scanning, and team features without managing keys yourself.