Brandwave

Codility vs Project Euler:Which is more popular?

In September 2026, Project Euler had more branded searches than Codility among coding challenge brands worldwide. Project Euler had about 27,100 branded searches, while Codility had 14,800. Project Euler made up 0.55% of all coding challenge brand searches we track, and Codility accounted for 0.3%. When we asked ChatGPT and Google AI Overviews about coding challenge brands, Project Euler appeared in two of the five answers and Codility in one. Project Euler was mentioned before Codility in two out of three answers that named either.

Among coding challenge brands worldwide in September 2026

Who do people search for more?

Project Euler, about 83% more searches than Codility

Project Euler 27.1K searchesCodility 14.8K searches

Who does AI mention more?

Project Euler, mentioned in 2 of 5 answers, Codility in 1

Project Euler in 2 of 5Codility in 1 of 5

Who does AI recommend more?

Project Euler, named ahead of Codility in 2 of 3 answers

Project Euler first in 2Codility first in 1

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Top coding challenge brands in ChatGPT and Google AI Overviews

In three ChatGPT questions and two Google AI Overviews, Project Euler was mentioned in two out of five: in one of the three ChatGPT answers and in one of the two Google AI Overviews. Codility was mentioned in one out of five: in one of the three ChatGPT answers, but not in either of the two Google AI Overviews. Project Euler was listed before Codility in two out of three answers that named either.

Most recommended by AI

Brands get a higher ranking if they are mentioned earlier in the answers.

  1. HackerRank1st
  2. LeetCode2nd
  3. CodeSignal3rd
  4. Codewars4th
  5. Codeforces5th
  6. Exercism6th
  7. CoderPad7th
  8. HackerEarth8th
  9. Codility9th
  10. Project Euler10th
  11. +1 more

Mentioned by AI

Each dot is one answer, filled in when that answer mentions the brand.

  • HackerRank5 of 5Named in 3 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • LeetCode4 of 5Named in 2 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • Codeforces3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Codewars3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Exercism3 of 5Named in 2 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • CodeSignal3 of 5Named in 1 of 3 ChatGPT answersNamed in 2 of 2 Google answers
  • HackerEarth2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • CoderPad2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Project Euler2 of 5Named in 1 of 3 ChatGPT answersNamed in 1 of 2 Google answers
  • Codility1 of 5Named in 1 of 3 ChatGPT answersNamed in 0 of 2 Google answers

+1 more

See every answer about coding challenge brands

5 answers

Not named in any answer:

Brands are shown in the order each answer named them. The survey took place in the United States on October 20, 2026.

Is Codility or Project Euler more popular in search?

This chart shows how often people search Google for Codility and Project Euler by name. Each line represents a brand's share of searches for all 11 coding challenge brands we track, month by month, from English-language searches worldwide.

Codility and Project Euler among coding challenge brands worldwide, by month

Share of searches by month for Project Euler, Codility. The figures are in the table below the chart.

View monthly share of searches table
MonthLeetCodeHackerRankCodeforcesCodewarsExercismHackerEarthHireVueCoderPadCodeSignalProject EulerCodility
Oct 202555.1%20.2%13.5%3.3%1.8%1.2%1.2%1%1.2%0.81%0.55%
Nov 202559.4%17.8%11.9%3.6%1.6%1.3%1.1%0.88%1.1%0.72%0.59%
Dec 202560.1%18%12.1%2.9%1.3%1.6%0.89%0.73%1.1%0.73%0.49%
Jan 202662.7%15.4%12.6%3.1%1.4%1.1%0.93%0.76%0.93%0.62%0.51%
Feb 202662.6%15.4%12.6%2.5%1.7%1.7%0.92%0.76%0.92%0.62%0.41%
Mar 202663.2%15.5%10.4%2.5%2.1%2.1%1.1%0.93%0.93%0.63%0.51%
Apr 202659.7%17.9%12%2.9%2%1.6%1.1%0.88%0.88%0.59%0.48%
May 202665.6%13.2%10.8%3.2%1.8%1.4%0.97%0.97%0.97%0.65%0.43%
Jun 202668.5%13.7%9.2%2.3%1.8%1.2%0.83%0.83%0.68%0.55%0.37%
Jul 202667.6%16.6%9.1%1.8%1.5%0.82%0.67%0.67%0.55%0.45%0.3%
Aug 202667.3%16.5%9%1.8%1.5%0.99%0.81%0.66%0.66%0.45%0.3%
Sep 202667.5%16.6%9.1%1.8%1.2%0.82%0.82%0.67%0.67%0.55%0.3%

How has the Codility and Project Euler comparison changed over the last 12 months?

3 findings

How did search popularity change for coding challenge brands worldwide in September 2026?

2 changes

  1. Estimated monthly branded searches for Codility worldwide fell 33.3% over 12 measured months, from 22.2K to 14.8K in September 2026.

  2. Estimated monthly branded searches for Project Euler worldwide fell 18.1% over 12 measured months, from 33.1K to 27.1K in September 2026.

How are branded searches counted?

2 search terms

Brandwave collects information about searches that people make online using Codility’s and Project Euler’s names. When viewed over time, estimated search volumes for these branded terms can be used to understand whether interest in the brands is growing, holding steady, or fading.

Codility

1 branded search term

  • codility

Project Euler

1 branded search term

  • project euler

How the Brand Demand Index is measured

Other head-to-heads among coding challenge brands

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