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

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Free service that takes care of your contacts, calendars and more so you don't have to.

Which is more popular?
Based on our record, Project Euler seems to be a lot more popular than fruux. While we know about 415 links to Project Euler, we've tracked only 9 mentions of fruux.
Website, pricing, platforms and company facts side by side.
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What each product offers, as listed by its team.


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An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Fruux is recommended for individuals and small businesses who need efficient, consistent synchronization of calendars and contacts across different platforms and devices. It's particularly beneficial for users who prioritize privacy and prefer open-standard solutions over closed ecosystems.
Walkthroughs and reviews on video.
Project Euler Challenges 1–4 - Coding Challenges with Florin
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Review: fruux
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Project Euler and fruux. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Project Euler provides a large collection of challenges in the domain of computer science and mathematics. The challenges typically involve writing a small program to figure out the solution to a clever mathematical...
If you are studying algorithms and computer programming, chances are you’ve heard of Project Euler. A collection of mathematical problems made for problem solvers who are interested to combine mathematics and...
Fruux This is another program that is available on your PC and for Android, so you can use it from one device to another without a worry. Fruux keeps your calendar linked to tasks as well as your contacts, making it a...
Recommendations tracked on public social media and blogs since March 2021.


Let's hope this is going to help me solve some more Project Euler [1] problems! [1] https://projecteuler.net/. - Source: Hacker News / 4 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... - Source: Hacker News / 9 months ago
Got a great suggestion from user MrPanofsky who recommended fruux. Gonna use calendar Fruux (https://fruux.com) in combination with calendar client OneCalendar (https://apps.apple.com/se/app/one-calendar/id1238379385?l=en-GB). Source: about 3 years ago
I ended up using the free tier of fruux.com (CalDAV service) to sync tasks to iOS. Everything looked good in fruux but was off by +1 days in iOS, not sure why but it was an easy fix. Source: about 4 years ago
Your original question was about how important it is to encrypt contacts and I think it depends. If you just want to keep your data out of Google's data collection hands, then there are other options to store/sync contacts and calendar... Source: over 4 years ago
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