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

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Create online group cards such as birthday cards, leaving cards or thank you cards that multiple people can sign. Choose from thousands of cards and add videos, gifs or photo messages easily.

Which is more popular?
Based on our record, Project Euler seems to be more popular. It has been mentioned 415 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | projecteuler.net | joyogram.com |
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| Company | — | Startup from the United States · 2025 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Project Euler yet.
Joyogram is an online group card service that collect ecard style messages individually or as a group to send digitally. Perfect for birthdays, leaving / retirements in a company, good luck messages, congratulation cards, get well soon card or any other type of greeting or occasion.
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
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
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Walkthroughs and reviews on video.
Project Euler Challenges 1–4 - Coding Challenges with Florin
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Project Euler and Joyogram.
Joyogram's answer:
We have used several services like this but never found one easy to use without an app needed, and allowing us to send beautiful group cards online that were not cheesy!
Joyogram's answer:
Our online group cards are beautiful and modern, nothing tacky here!
Joyogram's answer:
Our pricing allows unlimited access to everything!
Joyogram's answer:
Companies that want to celebrate coworkers / staff as a group
Joyogram's answer:
NextJS / Vercel
Joyogram's answer:
Amazon, Salesforce, to name a few!
Share your experience with using Project Euler and Joyogram. 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...
heir cards are really modern and website is super easy to use, we use it all the time to send online cards in our company.
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 / 8 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
Tracking Joyogram since Mar 2025.
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