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MandoCode vs OpenCode

Which one should you try?

MandoCode

Free

Best for .NET and C# developers

Visit MandoCode See full review

OpenCode

Free

Best for Developers who want an open-source coding agent in the terminal

Visit OpenCode See full review

Pricing, capabilities and platforms side by side. Prices are as of the "Pricing checked" date in the table.

MandoCode

MandoCode

MandoCode is a .NET CLI agent that reads your project, proposes diffs, and applies changes across files — the full plan-search-edit loop, entirely on your machine. It is built on Semantic Kernel and RazorConsole, which renders a Spectre.Console terminal UI using Razor components and a virtual DOM. The agent is designed around C# and .NET codebases, so the file understanding and diff proposals are tuned for that ecosystem. Web search is available without a key but the vendor states a free Tavily key improves reliability. The ceiling appears when you push outside .NET: community reports on the GitHub page are thin, and the tool's own framing is explicit about its target audience.

OpenCode

OpenCode

OpenCode is an MIT-licensed AI coding agent for the terminal that works with the model provider you choose, including local models. We installed it and ran three agent tasks: 9 of 9 passed with Claude Opus 5.5, 3 of 9 with a 3B local model.

AttributeMandoCodeOpenCode
PricingFreeFree
Price—Free (MIT). Optional Zen models pay as you go; Go $10/mo, Go Plus $40/mo
Pricing checkedNot checked yetOct 19, 2026
Free trialNot statedNot stated
Open sourceYesYes
Has APINoYes
Self-hosted optionYesYes
Platforms.NET 8, CLI/terminal, Ollama (local or cloud)Terminal, Desktop (beta macOS/Windows/Linux), IDE extension
Pros
  • Runs against local or self-hosted Ollama with no API keys required for core functionality, so your source code never leaves infrastructure you control — which means you skip the legal and security review that external AI coding tools typically trigger.
  • Single `dotnet tool install` command gets the agent running, so you are not wrestling with Python virtual environments or Node version conflicts before writing a line of code.
  • Project-aware planning loop — the agent reads across files, builds a plan, and proposes diffs before writing — so you review the full change set rather than discovering side effects after the fact.
  • RazorConsole terminal UI renders structured, navigable output in the console without a browser or IDE dependency, which means the tool works cleanly over SSH and in headless CI environments where other agent UIs break.
  • MIT-licensed and open-source, so you can audit exactly what the agent sends to the model and fork it when the default behavior does not match your workflow.
  • Passed all 9 of our agent tasks with Claude Opus 5.5.
  • Works with the provider you choose, including a local model behind an OpenAI-compatible server.
  • Open source under the MIT license.
Cons
  • The agent's file understanding, diff proposals, and documented use cases target .NET and C# explicitly. Teams with Python, Go, or TypeScript services in the same repository will find the agent has not been tested or tuned for those languages — at which point they are evaluating a different tool rather than configuring this one.
  • Model quality and context window are entirely determined by what Ollama can run on the available hardware. On a developer laptop with a mid-range GPU, large refactoring tasks that require holding the full context of a multi-file module will start failing silently or producing partial diffs — the agent cannot compensate for a model that cannot fit the prompt.
  • There is no API surface documented in the source page, which means MandoCode cannot be embedded in a larger automation pipeline or triggered by an external system. Teams that want the agent to run as a step in a CI workflow rather than interactively will need to build that wrapper themselves or switch to an agent that exposes a programmatic interface.
  • With a 3B local model it passed 3 of 9 tasks (only the simplest one), so plan on a larger model.
  • It reaches out to models.opencode.ai and registry.npmjs.org, and downloads provider packages on first use, so offline setups need those pre-installed.
  • The vendor lists its desktop app as beta.

Made up your mind?

MandoCode

Free

Best for .NET and C# developers

Visit MandoCode See full review

OpenCode

Free

Best for Developers who want an open-source coding agent in the terminal

Visit OpenCode See full review

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Specs come from each tool's own site and docs (how we test). AIDiveForge is editorially independent.

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