What happens when the extension you rely on every day refuses to load? That question drives the VS Code versus Cursor debate, and in 2027 it matters more than ever. Cursor is built on the VS Code codebase, so it looks familiar, feels familiar, and runs many of the same extensions. But “many” is not “all,” and the difference between the two editors creates workflow gaps that catch developers off guard.
This article breaks down where the two editors diverge, what those differences mean for daily work, and how to plan around them. The focus is practical: what breaks, what works, and what to check before committing a team to either tool.
Why Cursor Inherits VS Code Extensions at All
Cursor is a fork of VS Code. Anysphere built it on Microsoft’s open-source `vscode` repository, which means the editor shell, the settings model, the command palette, and the extension host all trace back to the same foundation. That inheritance is the reason a developer can open Cursor and feel immediately at home.
The inheritance is also where the confusion starts. Running on the same codebase does not mean running on the same marketplace, the same licenses, or the same API guarantees. Three separate layers matter:
| Layer | What It Controls | Why It Diverges |
|---|---|---|
| Editor codebase | UI, settings, keybindings | Shared, largely identical |
| Extension registry | Where extensions come from | Microsoft Marketplace vs. Open VSX |
| Extension licensing | Whether you may legally run it | Publisher-specific terms |
Most guides stop at the first layer and declare the editors “basically the same.” That is where users get burned.
The Marketplace Split Is the Biggest Practical Difference
The single most consequential difference is where extensions come from. VS Code pulls from the Microsoft Marketplace by default. Cursor cannot rely on that same source in the same way, because Microsoft’s Marketplace terms restrict its use to Visual Studio products.
When enforcement tightened, Cursor pointed users toward Open VSX, the Eclipse Foundation’s open registry. Open VSX hosts a large catalog, but it is not a mirror. Some publishers never list there, and some extensions that exist on both registries lag in version.
What this means in practice:
- Popular open-source extensions (themes, linters, formatters, Git tooling) are usually present on both.
- Microsoft-published extensions are frequently missing or restricted on Open VSX.
- Version parity is not guaranteed, so an extension might be a release or two behind.
A developer who assumes “my extension list will just carry over” is the one most likely to lose an afternoon. The fix is simple: before migrating, export your extension list and check each entry against Open VSX.
Licensing: The Difference Nobody Reads Until It Bites
Extension licenses are the quiet trap. The Microsoft C# extension, for example, carries a license restricting its use to Microsoft Visual Studio products. That restriction does not care that Cursor shares VS Code’s DNA. It is a legal boundary, not a technical one.
This matters most for teams. An individual tinkering on a side project may never notice. A company standardizing on a fork needs to audit which extensions carry product-specific licenses, because “it installed fine” is not the same as “we are licensed to run it.”
The practical habit: when an extension is critical to your workflow, read its license before you build a process around it. If the license ties the extension to a specific product family, plan an alternative rather than discovering the problem during an audit.
Where Extension Compatibility Actually Breaks
Compatibility problems cluster in predictable places. Not every extension is equally at risk, and knowing the pattern saves time.
Remote development extensions
Remote-SSH, Dev Containers, and WSL support are Microsoft-published and tightly coupled to VS Code. Their behavior in forks is not guaranteed. Teams that develop inside containers or on remote machines should test these workflows first, because they are the most likely to hit friction.
Debuggers and language tooling
Extensions that depend on proposed APIs or Microsoft-proprietary components are the next risk group. Some debuggers and C#/C++ tooling fall here. These extensions often work until they do not, and the failure can be subtle: a debugger that attaches but shows wrong values is worse than one that refuses to start.
Anything using proposed APIs
Microsoft documents that the VS Code Extension API is not fully stable and may change between releases. Extensions built on proposed APIs are the most fragile, because those APIs can shift without the same compatibility guarantees as stable ones.
Settings sync and profiles
VS Code supports Settings Sync and Profiles for carrying extensions and settings across machines. Whether Cursor offers equivalent sync for Marketplace extensions is version-dependent. Developers who switch machines often should verify this before assuming their setup travels with them.
If you are mapping out a migration, a structured walkthrough of the tradeoffs helps, such as this comparison of cursor alternatives and how they fit inside the AI code editor race.
The AI Layer: Two Different Architectures
Here is where the editors genuinely diverge in philosophy. VS Code treats AI as an add-on: GitHub Copilot Chat arrived as a first-party extension and became generally available in late 2023. Cursor treats AI as the core: inline edit, chat, and agent-style modes are built into the editor itself.
That architectural choice shapes the extension workflow:
| Aspect | VS Code | Cursor |
|---|---|---|
| AI integration | Extension-based (Copilot Chat and others) | Native to the editor |
| Extension reliance | High; AI comes from extensions | Lower; AI is built in |
| Customization | Broad, via many AI extensions | Narrower; AI behavior is opinionated |
| Best fit | Teams wanting mix-and-match tooling | Teams wanting one integrated AI workflow |
Neither is universally better. A team that has standardized on a particular AI assistant extension may find VS Code’s flexibility preferable. A team that wants AI editing to feel native may prefer Cursor’s approach, even at the cost of some extension freedom.
The extension angle matters because AI extensions are exactly the category where overlap is thinnest. Many AI coding assistants ship as VS Code extensions, and their availability in a fork depends on the same registry and licensing questions covered above. For a closer look at how the major AI editors stack up, this breakdown of Antigravity versus Cursor versus Claude Code covers the architectural differences in more depth.
A Practical Migration Checklist
Developers who move between the editors without a plan tend to hit the same problems in the same order. A short checklist prevents most of them.
- Export your current extension list and note which ones are critical versus nice-to-have.
- Check each critical extension against Open VSX for availability and version.
- Read the license on any extension your workflow depends on.
- Test remote development workflows, debuggers, and language tooling first.
- Verify settings and extension sync behavior on a second machine.
- Keep a fallback editor configured until the new setup proves stable.
Step four is the one people skip. It is also the one that surfaces the expensive surprises.
Common Mistakes and What Actually Works
The mistakes are consistent enough to list.
Assuming full extension parity. The editors share a codebase, not a marketplace. Treat extension availability as something to verify, not assume.
Ignoring license terms until procurement asks. License restrictions on Microsoft-published extensions are real and product-specific. Audit early.
Migrating everything at once. Move critical extensions first, confirm they work, then bring the rest. A big-bang migration makes it hard to tell what broke.
Forgetting about team consistency. One developer on a fork and nine on VS Code creates friction in shared configs, lint rules, and formatting. Align the team or document the differences.
Overlooking the API instability caveat. Extensions built on unstable APIs can break on updates. Pin versions for anything mission-critical.
What works is unglamorous: verify availability, read licenses, test the risky categories, and keep a rollback path. For teams weighing the two editors side by side, a structured setup guide on configuring VS Code and Windsurf alongside cursor alternatives walks through the configuration steps that prevent most of these issues.
Shared Rules Across a Mixed Team
One underrated workflow difference is how AI rules and settings are shared. When a team runs both editors, keeping AI instructions consistent across one repository becomes its own problem. A guide to sharing AI rules across one repo in Cursor and VS Code covers how to keep behavior aligned when developers use different editors on the same codebase.
The broader point: extension differences are only half the story. Configuration, AI behavior, and team conventions all drift when editors diverge, and the drift compounds quietly.
What to Expect in 2027
No one can state with certainty what the 2027 landscape looks like. What is reasonable to project, based on current trajectories:
- The marketplace split is likely to remain the defining difference, since it is rooted in licensing rather than technology.
- Open VSX coverage should keep improving, but parity with the Microsoft Marketplace is unlikely to be complete.
- AI integration will probably keep converging in features while diverging in architecture.
- Extension API stability will remain a caveat developers must plan around.
Treat these as projections, not promises. The safe posture is to build workflows that tolerate extension churn rather than betting on perfect parity arriving.
Conclusion
The workflow differences between VS Code extensions and Cursor come down to three things: where extensions come from, what their licenses allow, and which categories are most fragile. The shared codebase makes the transition feel seamless, and that feeling is exactly what causes problems. Developers who verify availability, read licenses, and test remote and debugging workflows before committing will avoid nearly every trap. Those who assume parity will spend their first week debugging an editor instead of shipping code. In 2027, the winning approach is the boring one: check first, migrate deliberately, and keep a fallback ready.
FAQ
Is Cursor just VS Code with AI built in?
Not quite. Cursor is a fork built on the VS Code codebase, so it inherits the editor shell, settings model, and much of the extension compatibility. But it pulls extensions from a different registry and carries its own licensing considerations. The AI is native rather than extension-based, which is a real architectural difference, not merely a feature add-on.
Why are some VS Code extensions missing in Cursor?
Because Cursor cannot rely on the Microsoft Marketplace the way VS Code does. Many extensions are available through Open VSX instead, but that registry is not a complete mirror. Microsoft-published extensions are the most likely to be absent or restricted, and version parity between the two registries is not guaranteed.
Can I use my existing extensions after switching?
Often yes, but verify first. Export your extension list, check each critical one against Open VSX, and confirm the version. Open-source themes, linters, formatters, and Git tooling usually carry over. Remote development extensions, debuggers, and Microsoft-published tooling are the categories most likely to cause trouble.
Are extension licenses really a problem?
They can be. Some Microsoft extensions carry licenses restricting use to Microsoft Visual Studio products, and that restriction applies regardless of how similar the fork is technically. Individuals rarely notice; teams doing procurement or compliance audits absolutely do. Read the license on anything your workflow depends on.
Which extensions break most often in forks?
The pattern is consistent: remote development extensions (Remote-SSH, Dev Containers, WSL), debuggers and language tooling that depend on proprietary components, and anything built on proposed APIs. Microsoft documents that the extension API is not fully stable, so extensions relying on unstable surfaces are the most fragile across updates. (Language Server Protocol)
Should a whole team switch at once?
Usually not. Migrating everything in one move makes it hard to tell what broke. Move critical extensions first, confirm remote and debugging workflows, then bring the rest. If part of the team stays on VS Code, document the differences in shared configs, lint rules, and AI instructions so behavior stays aligned across the repository.
