</> aicodedetect

C++ AI Code Detector

Paste C++ code to check whether it was likely written by an AI assistant or by a person. Works for coursework, contest solutions and production code. Free, no sign-up.

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Signals that C++ code was AI-generated

C++ gives programmers a huge number of ways to write the same thing, and most people settle into a personal subset. Assistants tend to pick the textbook-modern option every time. That consistency is the main thing to look for.

  • Exact, tidy includes. Each header the code needs and nothing else, in a neat block, where many people paste a habitual set or use <bits/stdc++.h>.
  • Fully qualified names. std:: written out on every vector, string and algorithm, while the author's other files open with using namespace std;.
  • Modern idiom without a lapse. const& parameters, auto, range-based loops, std::unique_ptr and std::optional used uniformly, with no raw new anywhere, in code from a course that teaches manual memory management.
  • Commentary on ownership. Comments explaining RAII, move semantics or why a reference is const, written as if for a reader learning the language.
  • A complete demo. A main that constructs test inputs and prints results with std::cout, attached to code that was supposed to be a single function.

Contest solutions are a special case

Competitive programmers usually work from a personal template: short type aliases such as ll, a fast I/O line with ios::sync_with_stdio(false), their own debug macros and a familiar way of reading input. Those habits persist across every problem they solve. A solution that suddenly lacks the author's usual template, names variables in full English and includes explanatory comments is a stronger signal than anything about the algorithm, because the algorithm for a given problem is often the same for everyone.

Why C++ is tricky to judge

Projects that enforce clang-format and clang-tidy produce uniform code regardless of who wrote it, and a well-maintained style guide asks for exactly the modern idiom listed above. Short snippets are the hardest case: a twenty-line function implementing a standard algorithm leaves no room for personal style. Paste a whole file or class where you can, and weigh the reasons the detector gives against what you know about the author and the codebase.

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Frequently asked questions

Can it check competitive programming solutions?

Yes, paste the full solution including your includes and macros. Bear in mind that contest problems often have one standard approach, so the algorithm itself says little; the surrounding habits say more.

Does modern C++ automatically look AI-generated?

No. Smart pointers, range-based for loops and auto are simply good practice. They become a signal only when they are applied with perfect consistency in code from someone whose other work looks different, or alongside other generated patterns.

Should I choose C or C++ in the language menu?

Auto-detect handles most snippets. Pick C++ explicitly if the code is short and could pass as either language, for example a function that only uses arrays and printf.

Does clang-format affect the score?

It can push it up a little, since consistent formatting is one of the things read. It should not decide the result on its own; check whether the stated reasons go beyond formatting.

Is my C++ code stored?

No. The snippet goes to a third-party AI model provider (Groq, with Google Gemini as a fallback) for the analysis and the result comes straight back to you. We do not save the code or write it to our logs.