Top 10 Best AI Coding Assistants

Amazon Q Developer is AWS's coding assistant and the successor to CodeWhisperer, available in the AWS console and as an extension for VS Code and JetBrains IDEs. Beyond inline completion it runs a security scanner over your code and offers agents that attempt whole tasks, such as generating unit tests or upgrading a Java codebase across versions.

Tabnine's pitch is that the model never has to leave your network: it runs self-hosted or in a private cloud, and can be tuned on a company's own repositories so completions follow in-house conventions rather than generic public-code patterns. That is what it sells to organisations which cannot send source code to a third-party API.

Codeium built its following on an unlimited free tier for individual developers at a time when rivals metered completions, with plugins covering an unusually wide range of editors. The company later renamed itself Windsurf after its own AI editor, and in 2025 it was broken up - Google licensed the technology and hired the founders, and Cognition bought what remained.

Devin, from Cognition, is pitched as an autonomous software engineer rather than an autocomplete: it works in its own sandbox with a shell, an editor and a browser, and opens pull requests. Cognition's March 2024 launch claimed it resolved 13.86% of SWE-bench issues unassisted — a figure that drew public scrutiny over how the demo and the benchmark sample were presented.

Replit AI is built into Replit's browser-based IDE, so there is no local setup: completion, explanation and debugging run in the same tab as the editor and the deployed app. Launched as Ghostwriter in 2022 and folded into Replit AI in 2023, it was later joined by Replit Agent, which scaffolds and iterates on a whole project from a prompt.

Cody is Sourcegraph's coding assistant, and its differentiator is the search index behind it: it pulls context from a whole repository - or, in the enterprise version, across many repositories - rather than only from the files open in your editor. It ships as an extension for VS Code and JetBrains IDEs and lets you choose which underlying model answers.

Google Gemini Code Assist offers a context window large enough to take in an entire codebase in a single prompt. It is integrated into Google Cloud, Cloud Shell, and IDEs via extensions, and enterprise customers can fine-tune it on internal codebases with compliance logging — the reason it lands well in regulated industries.