Last updated 08-21-2026
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TimeComplexity.ai
Paste a function into TimeComplexity.ai and it returns Big O runtime complexity with plain-language reasoning. You drop in an algorithm snippet, and the site responds with notation like O(n log n) plus an explanation of why that bound fits the loops and recursion it sees.
Static analyzers usually need a full file with imports and a main block. TimeComplexity.ai accepts partial snippets in Python, JavaScript, Java, C++, Go, and other languages without headers or setup code. That makes it useful for interview prep and quick checks on isolated functions pulled from a larger codebase.
Developers, CS students, and interview candidates use TimeComplexity.ai to sanity-check algorithm bounds before submitting homework or reviewing pull requests. Anonymous users get 20 queries per day, signed-in users get 50, and the $5 per month Pro plan removes the daily cap.
Returns Big O notation plus written reasoning for each pasted code snippet
Accepts partial code without headers, imports, or a main function across common languages
Uses GPT-3.5 Turbo with a formatted prompt, per the site FAQ
Anonymous users receive 20 queries per day; signed-in users receive 50 free queries daily
Pro plan at $5 per month unlocks unlimited queries with query history and deletion
Each analysis gets a shareable ID so you can link results with teammates
Analyzes isolated code snippets without imports, headers, or boilerplate that static tools require.
Returns both Big O notation and a written explanation for each query.
Generous free tiers with 20 anonymous or 50 signed-in queries per day before paying.
Pro plan is $5 per month for unlimited usage, which is inexpensive for daily interview prep.
Works across many languages rather than locking you into one ecosystem.
The homepage warns that AI-generated complexity results may be incorrect in subtle ways.
Uploaded snippets are public by default with shareable IDs, which is risky for proprietary code.
No private upload option yet despite the FAQ mentioning it as a possible future feature.
Is TimeComplexity.ai free to use?
TimeComplexity.ai offers a free tier with 20 queries per day for anonymous users and 50 queries per day for signed-in accounts. The Pro plan costs $5 per month and includes unlimited queries plus access to past results.
How does TimeComplexity.ai analyze code?
TimeComplexity.ai uses GPT-3.5 Turbo with a prompt designed to return formatted Big O results and reasoning. It works on pasted snippets without requiring imports, headers, or a complete program.
Which languages does TimeComplexity.ai support?
TimeComplexity.ai states that any programming language should work, including Python, JavaScript, Java, C++, C, Go, and pseudocode. You only need to paste the function or algorithm you want analyzed.
Is uploaded code on TimeComplexity.ai public?
Yes, TimeComplexity.ai assigns each upload an ID that can be shared with others. The FAQ notes that private uploads for signed-in users may arrive in a future release.
How do I cancel TimeComplexity.ai Pro?
TimeComplexity.ai Pro can be canceled anytime from the Account page. Access continues until the end of the current 30-day billing period after cancellation.
Is payment on TimeComplexity.ai secure?
TimeComplexity.ai processes payments through Stripe with bank-level security standards. The site does not store card information on its own servers.