GitHub Copilot is the assistant most developers end up using by default, largely because it lives where the work already happens. It provides inline completions, chat, a command-line assistant, pull request summaries, code review, and agent-style multi-file edits across VS Code, JetBrains IDEs, and GitHub itself.

Its real advantage is context. Because it can draw on the repository, open files, and GitHub's own surfaces, suggestions tend to match the conventions of the codebase rather than arriving as generic boilerplate. For teams already on GitHub, the review and workflow integration is the part that is genuinely hard to replicate elsewhere.

The caveat that matters most is verification. Copilot produces confident, syntactically clean code that can still be wrong — subtly wrong about an API's behaviour, a library's version, or an edge case nobody tests. Treat it as a fast first draft rather than an authority, and keep tests in the loop.

Pricing is tiered and the gaps between tiers are meaningful. The free plan covers a monthly allowance of completions plus limited chat and agent usage, which is enough to judge fit honestly. Business and Enterprise plans add organizational controls, policy management, and stronger IP indemnification, which is often the deciding factor for regulated teams. Some review capabilities are limited on lower tiers, so check the feature matrix against your actual workflow rather than assuming parity.

Two limitations worth stating plainly. It is an assistant, not an autonomous engineer: you stay responsible for what ships. And quality varies by language and framework, so a team working in a mainstream stack will see better results than one on something niche.

A practical way to get value quickly: turn it on for a language and framework you know well, so you can judge suggestions instantly rather than accepting them on trust. Write clear function names and comments before the body, since they steer the completion more than most people expect. And keep the tests running — the habit that makes an assistant genuinely useful is the one that catches the confident mistake.

Best for professional developers who want fast, well-integrated assistance without leaving their editor. Not for teams expecting a hands-off agent that ships work on its own.