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Advent of Code alternatives: 4 apps ranked by verified data

Facts checked Nov 8, 2026AppBreakup editorialHow we rankAll coding practice platforms

Top picks

Common reasons people leave Advent of Code: new puzzles only appear in December, and no global leaderboard any more. We ranked 4 alternatives by how directly each one replaces Advent of Code, then by reviews, real visits and how recently each app's facts were checked against its own website. CodinGame currently ranks first.

Quick comparison

#AppPricingVerified priceOpen sourcePlatformsVerified factsScore
1CodinGame logoCodinGameFree—NoWeb4 of 468.8
2LeetCode logoLeetCodeFree plan + paid—NoWeb, iOS, Android4 of 462.6
3GeeksforGeeks logoGeeksforGeeksFree plan + paid—NoWeb, Android, iOS4 of 461.8
4Kaggle logoKaggleFree—NoWeb3 of 351.2
  1. CodinGame logo

    1. CodinGameTop pick

    Best for: Developers who want game-style coding challenges and bot-programming contests

    FreeWeb

    68.8

    score / 100

    Why switch from Advent of Code

    Year-round puzzles and bot contests with an in-browser editor and leagues.

    Pros

    • Bot programming leagues with real opponents' code
    • Many formats: optimisation, code golf, puzzles, five-minute clashes
    • Public API lets AI coding agents play contests and puzzles

    Cons

    • Game puzzles map poorly to typical interview questions
    • Runs only in the browser, with no offline mode
    • Contest schedule is limited to a few events a year
    Visit CodinGame Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is CodinGame a good Advent of Code alternative?

    Verified facts

    4 of 4 verified
    Game modes
    Bot programming, optimisation, code golf
    Checked Nov 8, 2026codingame.com(opens source in a new tab)
    API for AI agents
    Yes
    Checked Nov 8, 2026codingame.com(opens source in a new tab)
    Clash of Code
    5-minute coding battles
    Checked Nov 8, 2026codingame.com(opens source in a new tab)
    Code golf
    Shortest passing code wins
    Checked Nov 8, 2026codingame.com(opens source in a new tab)
  2. LeetCode logo

    2. LeetCode

    Best for: Developers preparing for algorithm-heavy technical interviews at tech companies

    Free plan + paidWeb, iOS, Android

    62.6

    score / 100

    Why switch from Advent of Code

    Large always-available problem bank with an online judge, aimed at interviews.

    Pros

    • Huge problem library with an in-browser judge for many languages
    • Free weekly and biweekly contests with a public rating
    • Premium lets you filter questions by the companies that asked them

    Cons

    • Teaches interview puzzles, not how to build real software
    • Official solutions and many popular questions sit behind Premium
    • Little guided structure for beginners compared with course-style sites
    Visit LeetCode Compare with Advent of CodeDetails and reviews
    How this score is calculated
    Editorial fit ×0.387
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is LeetCode a good Advent of Code alternative?

    Verified facts

    4 of 4 verified
    Languages
    C++, Java, Python, JavaScript, Go, Rust and more
    Checked Nov 8, 2026support.leetcode.com(opens source in a new tab)
    Contests
    Weekly and biweekly
    Checked Nov 8, 2026support.leetcode.com(opens source in a new tab)
    Premium extras
    Company-tagged questions and mock interviews
    Checked Nov 8, 2026support.leetcode.com(opens source in a new tab)
    Premium billing
    Monthly or annual
    Checked Nov 8, 2026support.leetcode.com(opens source in a new tab)
  3. GeeksforGeeks logo

    3. GeeksforGeeks

    Best for: CS students and job seekers who want free explanations and practice problems for DSA and interviews

    Free plan + paidWeb, Android, iOS

    61.8

    score / 100

    Why switch from Advent of Code

    Daily practice problems plus tutorials explaining the algorithms behind them.

    Pros

    • Free articles on almost every CS and DSA topic you'd be asked in interviews
    • Company-wise interview experiences and practice problems in one place
    • Paid courses cover DSA, system design and placements in depth

    Cons

    • Free pages carry a lot of ads unless you pay for Premium
    • Article quality and accuracy vary between authors
    • Practice judge is less polished than LeetCode for contest-style problems
    Visit GeeksforGeeks Details and reviews
    How this score is calculated
    Editorial fit ×0.377
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is GeeksforGeeks a good Advent of Code alternative?

    Verified facts

    4 of 4 verified
    Founded
    2008
    Checked Nov 8, 2026geeksforgeeks.org(opens source in a new tab)
    Registered users
    50 million+
    Checked Nov 8, 2026geeksforgeeks.org(opens source in a new tab)
    Owner
    Sanchhaya Education Pvt Ltd
    Checked Nov 8, 2026geeksforgeeks.org(opens source in a new tab)
    Premium course coverage
    50+ technologies
    Checked Nov 8, 2026geeksforgeeks.org(opens source in a new tab)
  4. Kaggle logo

    4. Kaggle

    Best for: Students and data scientists who want free notebooks, public datasets and ML competitions in one place

    FreeWeb

    51.2

    score / 100

    Why switch from Advent of Code

    Ongoing competitions if your interest is data science rather than algorithms.

    Pros

    • Free hosted notebooks with a weekly GPU and TPU allowance
    • Huge library of public datasets and models to start from
    • Competitions give real problems with public leaderboards
    • Official open-source CLI for downloading data and submitting

    Cons

    • Notebook sessions have time limits and capped accelerator hours
    • Not built for private team work on company data
    • Web only; the notebook environment can't be self-hosted
    Visit Kaggle Details and reviews
    How this score is calculated
    Editorial fit ×0.341
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Kaggle a good Advent of Code alternative?

    Verified facts

    3 of 3 verified
    Official CLI
    Yes, open source (Apache-2.0)
    Checked Nov 2, 2026github.com(opens source in a new tab)
    Notebook environment
    Public Python Docker image
    Checked Nov 2, 2026github.com(opens source in a new tab)
    Python client library
    kagglehub (Apache-2.0)
    Checked Nov 2, 2026github.com(opens source in a new tab)

The best Advent of Code alternative for…

The highest-ranked app in this list for each need.

CodinGame logo

Best Advent of Code alternative for most people

CodinGame

Year-round puzzles and bot contests with an in-browser editor and leagues.

Kaggle logo

Best Advent of Code alternative for a free option

Kaggle

Ongoing competitions if your interest is data science rather than algorithms.

LeetCode logo

Best Advent of Code alternative for a free plan you can upgrade

LeetCode

Large always-available problem bank with an online judge, aimed at interviews.

GeeksforGeeks logo

Best Advent of Code alternative for iPhone and Android

GeeksforGeeks

Daily practice problems plus tutorials explaining the algorithms behind them.

CodinGame logo

Best Advent of Code alternative for working in the browser

CodinGame

Year-round puzzles and bot contests with an in-browser editor and leagues.

Advent of Code alternatives: common questions

What is the best alternative to Advent of Code?

CodinGame ranks first right now. Year-round puzzles and bot contests with an in-browser editor and leagues. LeetCode and GeeksforGeeks follow it in our ranking.

Advent of Code vs CodinGame: what's the difference?

Both Advent of Code and CodinGame are free to use. Both run on Web.

Is Advent of Code free?

Advent of Code is free to use. Price: Free. Checked on Advent of Code's own site, November 2026.

Is there a free alternative to Advent of Code?

Yes. CodinGame (free), LeetCode (free plan + paid), GeeksforGeeks (free plan + paid) and Kaggle (free) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to Advent of Code?

None of the 4 alternatives in this list is open source.

Why do people switch from Advent of Code?

The complaints we hear most: new puzzles only appear in December; no global leaderboard any more; no in-site editor, hints or test runner.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces Advent of Code, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.