If you inherited or generated an app with AI help, you have probably seen three names come up over and over: Cursor, Claude Code, and v0. They show up in your project files, in the advice threads you read, and in the notes from whoever helped you build. And they tend to get mentioned in the same breath, as if they were three flavors of the same thing.
They are not. They do different jobs, they leave behind different things for you to maintain, and knowing which is which makes your app a lot less mysterious on day 2. This is a plain-English sort of all three, written for someone who never wrote the code and does not want to pretend otherwise.
Why these three names get lumped together (and shouldn't be)
All three involve AI and all three touch code, so it is easy to file them under one label in your head: "the AI thing that made my app." But they sit at different points in the building process.
One helps a person edit an existing codebase. One can carry out multi-step changes on its own once you describe the goal. One generates user-interface designs from a prompt. Those are genuinely different jobs, and treating them as interchangeable is where a lot of day-2 confusion starts. If you assume "the AI" did everything uniformly, you will look in the wrong place when something breaks.
A useful habit: instead of asking "which one is best," ask "what job was each doing in my project." That question has an actual answer, and it is the one that helps you own what you built. (This is also the difference between a review and a horse race, which is why we treat the three as separate jobs rather than competitors on one axis.)
A caveat before we start: all three products change quickly. The capability descriptions below are based on each tool's own documentation, not on hands-on testing, and specific features shift over time. Before you rely on any specific capability, check the tool's current docs rather than trust a snapshot.
Cursor: what it is for and what it means for your app
Cursor is a code editor. Think of it as the workspace a person sits in to open, read, and change the files that make up your app, with AI assistance built into that workspace. Its documented purpose is to let a developer edit an existing codebase faster, using AI to suggest changes, answer questions about the code, and make edits across files.
The key phrase is "a person sits in it." Cursor is a place where someone works. It assumes there is a human driving, reading suggestions, and deciding what to keep. It is not a machine that produces a finished app while you watch.
What it means for your app
If your app was built or modified in Cursor, what you are left with is a normal codebase: the actual files, in whatever languages and frameworks were used. Cursor does not lock those files into a proprietary format. That is good news for ownership, because the artifact is standard code that any developer (or any other editor) can open.
The day-2 implication is that the quality and structure of those files depend on whoever was driving, not on Cursor itself. The editor made edits easier; it did not guarantee they were correct, secure, or well-organized. So "it was built in Cursor" tells you where the work happened, not how good it is. When you eventually need to understand what is in there, the skill you want is reading code you didn't write, because the files are yours to read.
Claude Code: what it is for and what it means for your app
Claude Code is an agentic coding tool. "Agentic" means that once you describe a goal in plain language, it can carry out a sequence of steps to reach it: reading files, making changes across the project, running commands, and checking results, with less step-by-step direction than a plain editor requires. Its documented purpose is to act on a codebase from the command line based on your instructions.
The mental model here is less "a workspace you sit in" and more "a capable helper you delegate a task to." You say what you want, and it works through the change. That is powerful, and it is also why it deserves its own category. If you want the longer version of how this class of tool behaves, we cover what agentic coding tools actually do separately.
What it means for your app
Like Cursor, Claude Code works on real code and leaves you with real files, not a locked format. The difference on day 2 is about how much was done in one pass and how much you were watching.
Because an agentic tool can make many changes to reach a goal, the changes can be broad. That is fine when they are reviewed. It becomes a day-2 problem when a lot of code was generated or altered quickly and nobody read it closely. You may be maintaining more moving parts than you realize, and the reasoning behind some of them may live only in a prompt that is now gone.
The practical takeaway: if Claude Code (or any agentic tool) was used heavily, your first day-2 job is to find out what it changed and get an honest picture of the current state, rather than assuming a clean, minimal result. Learning to direct, review, and extend AI code is exactly the muscle this situation asks for.
v0: what it is for and what it means for your app
v0 is a UI generation tool. Its documented purpose is to turn a text description into user-interface designs and the front-end code that renders them: the visible parts of an app, like a landing page, a form layout, or a dashboard screen. You describe what you want on screen, and it produces a version of that screen.
This is a narrower job than the other two, and naming it precisely matters. v0 is focused on the front end, the part users see and click. It is not the tool that wires up your database, handles logins, or processes a payment. Those live elsewhere in your app.
What it means for your app
If parts of your interface came from v0, what you are left with is generated front-end code that was dropped into your project. On day 2 that has two implications worth knowing.
First, the visible polish of a screen tells you nothing about what is behind it. A form can look finished and complete while the logic that receives the submitted data is missing, incomplete, or insecure. Generated UI is a starting surface, not a working feature end to end.
Second, generated interface code still has to be maintained like any other code. It can carry patterns you did not choose and would not have written, and it needs the same care as the rest of the app when you change things later.
Day-2 implications: what each leaves behind for you to own
Here is the same information as a side-by-side, sorted by the job each tool does rather than by any ranking.
| Tool | The job it does | What you are left maintaining on day 2 |
|---|---|---|
| Cursor | A workspace where a person edits an existing codebase with AI help | Standard code files; quality reflects whoever was driving, not the editor |
| Claude Code | An agentic tool that carries out multi-step changes from a described goal | Standard code files, possibly changed broadly and quickly; reasoning may only exist in past prompts |
| v0 | Generating user-interface designs and front-end code from a description | Generated front-end code; looks finished but says nothing about the logic behind it |
Two things are true across all three, and they matter more than the differences.
One: none of them is a proprietary trap. All three work with standard code, so what you are left with is portable and readable, at least in principle. That is a real point in your favor for owning your app.
Two, and this is the one to write down: these are development tools, not guarantees of quality or security in the output. A tool being modern, popular, or "AI-powered" does not mean the code it helped produce is correct, safe, or well-built. The output still needs to be read, tested, and secured like any other code. If your app handles logins, payments, or personal data, "it was built with a good tool" is not a substitute for having someone qualified review those specific parts. That is the threshold where hiring a professional is worth it, regardless of which tool was involved.
In Plain English
Here is each one in a sentence:
- Cursor is a workspace where a person edits your app's code with AI help, so it leaves you with normal code files whose quality depends on whoever was driving.
- Claude Code is an agentic tool that carries out a described goal across your code on its own, so on day 2 your job is to learn what it actually changed.
- v0 generates the visible parts of an app from a description, so a screen can look finished while the logic behind it is not.
What this means: the three names you keep seeing are three different jobs, not three brands of the same product. Sorting them by job is what lets you reason about your own app.
Who this helps: a non-technical owner whose app was built or touched by one or more of these and who wants to stop treating them as one blurry thing.
When to use this: when a tool name shows up in your project or your advice threads and you need to know what it was responsible for.
What to do next: figure out which of these actually touched your app, then look at what each left behind using the day-2 lens above. You do not need to become an engineer to do that; you need to know which door to open.
A few quick questions
Do I need all three? No. They do different jobs, and plenty of apps use only one or none. The right question is which one (if any) is in your project, not how to collect them.
Which is best? That is the wrong axis. They are not competing on a single scale, so "best" does not apply. What matters is which job you need done and which tool you can live with maintaining, which is really a question about choosing a tool you can actually live with.
If my app was built with these, is it secure? Not automatically. These are development tools, not security guarantees. Anything handling logins, payments, or personal data should be reviewed on its own merits, and by a professional past a basic threshold.
Where to go next
New to these terms? Start with the plain-English path in Start here, then browse Tools rated for day-2 to see how individual tools hold up once you have to maintain what they produce. If you are ready to be more hands-on with the code these tools leave behind, Direct AI well is the next stop.
Kodbe is an independent commercial publication about maintaining and owning software built with AI or no-code tools. It is not affiliated with Kodbe Inc, Kodobe, Kodable, or Kodu.