
Project Euler
LeetCode
Exercism
Codewars
HackerRank
CodeSignal
CodeCombat
CodeForces
Respondent
User Interviews
UserTesting.com
Qualaroo
Netigate
Poll Everywhere
ARCS
Zappi
Project Euler
RespondentBased on our record, Project Euler seems to be a lot more popular than Respondent. While we know about 415 links to Project Euler, we've tracked only 23 mentions of Respondent. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Let's hope this is going to help me solve some more Project Euler [1] problems! [1] https://projecteuler.net/. - Source: Hacker News / 3 months ago
Https://projecteuler.net/ for "Thinker" brain food. (it still has the issue of not being a pragmatic use of time, but there are plenty interesting enough questions which it at least helps). - Source: Hacker News / 7 months ago
I have a Project Euler (https://projecteuler.net/) account. Though I do not register at all on the leader board I will sometimes work obsessively on a problem just to make one of the level icons light up for me. There is not really competition just a tiny reward. - Source: Hacker News / 8 months ago
I do hobby programing. It is sometimes to create something (supposedly) useful. Lately though it is more discovery and a little math like. I enjoy Project Euler (https://projecteuler.net/. Recently I have been playing with superpermutations (https://projecteuler.net/) and pencil and paper is useful but filling lots of paper with lots of numbers is not that fun. - Source: Hacker News / over 1 year ago
As pointed out in a sibling comment, it appears that quote only shows up if you're logged in, but assuming you have an account and are logged in, it's on the homepage (https://projecteuler.net/), second paragraph under the following heading: > I learned so much solving problem XXX, so is it okay to publish my solution elsewhere? > It appears that you have answered your own question. There is nothing quite like... - Source: Hacker News / over 1 year ago
Respondent.io is great as well. Lots and lots of studies every day posted, these can pay very well depending on your specialty. Source: over 2 years ago
Hi! No, this is a legitimate project. You can visit our website respondent.io to know more about the company. Thank you! Source: about 3 years ago
If you have a bit more budget, you can also recruit participants from online panels (like userinterviews.com or respondent.io). For an incentive, you can screen the right people to participate in your playtest. Keep in mind you will need to do some vetting and make sure you're not getting "professional" participants. Source: over 3 years ago
If you're having difficulty recruiting yourself, I've used respondent.io in the past. Keep in mind recruiting hard to access types of users is often expensive and/or time consuming. Source: over 3 years ago
Figure out how you can make more income. Maybe you create an account on upwork or fiverrr (platform for freelancers) and help a company out with social media, or reviewing resumes. Maybe you try driving for doordash or ubereats. Maybe you sign up for respondent.io and get paid to do research interviews (we hire people from here all the time). I promise making a little bit of extra cash goes a long way to feeling... Source: over 3 years ago
LeetCode - Practice and level up your development skills and prepare for technical interviews.
User Interviews - User Interviews is a tool to recruit participants for product tests and market research.
Exercism - Download and solve practice problems in over 30 different languages.
UserTesting.com - Usability testing has never been easier. Get videos of real people speaking their thoughts as they use websites, mobile apps, prototypes and more!
Codewars - Achieve code mastery through challenge.
Qualaroo - Qualaroo makes it easy to survey specific groups of website visitors to gain qualitative information.