Software Alternatives, Accelerators & Startups


Sphere Online Judge created for the coders' community to train, to learn and to make progress.

Spoj Alternatives

The best Spoj alternatives based on verified products, community votes, reviews and other factors.
Filter: 10 Open-Source Alternatives Latest update:

  1. 23

    Practice and level up your development skills and prepare for technical interviews.

    Open Source

  2. 24

    HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.

  3. The community building platform for creators, coaches, communities & businesses to sell memberships, events, private groups & so much more.

    Try for free freemium $39.0 / Monthly (Base Plan, Use promo code SOCIALLY50 for a 50% off on all plans)

    Try for free
  4. 17

    CodinGame provides users with a fun and effective way to learn coding that eschews the rigid structure of traditional teaching methods.

  5. 21

    CodeSignal is the leading assessment platform for technical hiring.

  6. 19

    Achieve code mastery through challenge.

    Open Source

  7. 16

    Coderbyte is a place built for anyone to practice and perfect their programming skills.

  8. 18

    Project Euler is a series of challenging mathematical/computer programming problems that will...

    Open Source

  9. CodeChef is a not-for-profit educational initiative by Directi, an Indian software company. It is a global programming community that fosters learning and friendly competition, built on top of the world’s largest competitive programming platform.

  10. Learn and Practice on almost all coding interview questions asked historically and get referred to the best tech companies

  11. Codility provides a SaaS platform with advanced validation, security and protection features to evaluate the skills of software engineers.

  12. 12

    Learn to Code in 90 Days or Less

    paid Free Trial $120.0 / Annually

  13. 10

    Download and solve practice problems in over 30 different languages.

    Open Source

  14. 12

    The Topcoder home page has received a slick new makeover that lets new customers quckly login, discover the power of our community, and launch challenges.

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