Keeping code documentation up to date is one of the most tedious parts of software development. AI tools have gotten surprisingly good at generating docstrings, API references, and even full codebase overviews — here are the tools worth trying in 2025.
Let's be honest: writing documentation is rarely the fun part of building software. But it's also the thing you'll curse past-you for skipping when you're debugging a six-month-old function at 2 AM.
AI tools have quietly gotten good at this. Not just autocomplete — real, context-aware documentation generation that understands your codebase, your language, and your conventions. Here's what's worth your time.
There are basically three approaches to AI-powered documentation:
The best setup often combines two of these — for example, using an IDE assistant for daily docstring generation and a platform like Mintlify for polished, published docs.2
Best for: developers already living in JetBrains IDEs
If you're in IntelliJ, PyCharm, or any JetBrains IDE, this is the most seamless documentation experience available. The AI assistant is deeply integrated — it understands your project structure, your imports, and your coding patterns. When you ask it to generate a docstring, it pulls context from the surrounding code, not just the function signature.
It supports multiple languages natively and can generate everything from JavaDoc to Python docstrings to Rust documentation comments. The tight integration means you never leave your editor.1
Specs:
Best for: teams already on GitHub, multi-IDE flexibility
Copilot has become the baseline for AI coding assistants, and its documentation generation is solid. It's particularly good at generating docstrings on the fly — just type /** or """ above a function and it'll suggest a complete description, parameter list, and return value documentation.
Where it shines is flexibility: it works in VS Code, JetBrains, Neovim, and many other editors. If your team uses different IDEs, Copilot gives everyone the same assistant.1
Specs:
Best for: developers who want a generous free tier
Codeium has emerged as a strong Copilot alternative, and its documentation capabilities are genuinely competitive. It offers context-aware docstring generation, code explanation, and refactoring suggestions — all with a free tier that's unusually generous for what you get.
It's particularly strong for solo developers or small teams who don't want to pay per-seat pricing. The documentation generation quality is on par with Copilot for most languages, and it supports the same broad range of editors.1
Specs:
Best for: developers who want to use an API or run models locally
DeepSeek's Mixture-of-Experts models are specialized for code, and they produce excellent technical documentation when prompted correctly. The key advantage is flexibility: you can use it via API, integrate it into your own tooling, or run it locally if you have the hardware.
It's not an IDE plugin out of the box — you'll need to use it through an API client, a chat interface, or a third-party plugin. But for teams that want to build custom documentation pipelines or need offline capability, it's the most versatile option.
Specs:
| If you... | Pick this |
|---|---|
| Live in JetBrains IDEs | JetBrains AI Assistant |
| Want the most flexible, widely-supported option | GitHub Copilot |
| Need a free tier or work on a small team | Codeium |
| Want to build custom tooling or run locally | DeepSeek |
We're affiliates for some of these tools — meaning if you click through and sign up, we may earn a small commission at no extra cost to you. We only recommend tools we've actually evaluated, and we don't rank anything we wouldn't use ourselves.
The best documentation tool is the one you'll actually use. Start with the free tiers, see what fits your workflow, and don't overthink it. Your future self will thank you.
Sources: 1 AI Comparo — AI Documentation Tools Comparison 2025 · 2 Dev.to — My Favorite AI-Powered Document Tools in 2025
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