Life & fun · alternatives · 2026
24 alternatives to I wrote a blog post about the Two's Complement
Hi folks, I wrote a blog post about the two's complement. I always scratched my head about some details: - "Take the ones' complement and add one" - "Half of the range are negative numbers" - etc. Now I think I understand these details, but had to piece it together from some sources. I'd love to get your feedback on this post. Looking forward. BR, Pedram
Pedram has written a blog post explaining two's complement, the binary number system used in computing. The post addresses common points of confusion, including why taking one's complement and adding one works and why… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. I wrote a blog post about the Two's Complement launched in 2023; newer entries below may have overtaken it.
- 1IM
I've been studying interval arithmetic for the past few weeks and it's a really interesting field because while there is a ton of super interesting research published over the past decades, it has never really gotten the recognition that it deserves, IMO. One reason for this is that standard interval arithmetic has really poor handling of division by intervals containing zero. If you compute 1 / [-1, 2] in regular interval arithmetic, you get either [-∞, +∞], or you have to say that the operation is undefined. Both solutions are virtually useless. The real answer of course is [-∞, -1] U…
Apr 2026 · victorpoughon.github.io · its alternatives →
- 2IM
This is the first iteration of a short game I’m making that tries to interactively explain some of my favorite math questions / ideas. My goal is mostly to get the player curious and not necessarily to explain absolutely everything. There were a lot of fun technical parts to building this: - For implementation reasons, it’s much easier if the lines all have integer intersection points with each other. To do this, when a new line is added I “cheat” by rounding intersections to integers and then splitting the old lines at the intersection into new linds (with potentially different slopes)…
2024 · rahulilango.com · its alternatives →
- 3IW
The book page links to a blog post that explains how I got about it (and has a link to sample content), but the TL&DR is that I could not find a lot of books that were on "our" history _and_ were larded with technical details. So I set about writing one, and some five years later I'm happy to share the result. I think it's one of the few "computer history" books that has tons of code, but correct me if I'm wrong (I wrote this both to tell a story and to learn :-)). My favorite languages are Smalltalk and Lisp, but as an Emacs user, I've been using the latter for much longer and for my…
Feb 2026 · berksoft.ca · its alternatives →
- 4
Hey, maker here. After launching a daily word search game, I randomly thought of this math game while driving. Finally got around to making it and I think it turned out pretty cool. It’s a math search game that’s meant to help you practice your quick addition, subtraction, multiplication, and division skills. I’m hoping it’ll help people (even those like me who aren’t big on math) learn and increase their speeds. (There are also some settings you can enable to make the game harder) If you try it out, please let me know if you found it fun, if you have anything you’d like me to add, or if you…
2024 · worchle.com · its alternatives →
- 5
Hey there! I'm the brains behind the math crossword game on my site. This game is all about making math a little more fun – users just drag and drop numbers to fill in the blanks and move on to the next level if they get it right. Let me know if face any issues or have any suggestions! :)
2024 · scientific.place · its alternatives →
- 6IM
https://github.com/siraben/ti84-forth Hi HN! For the past year I've been getting into programming in Z80 assembly (especially for the TI-84+). More recently I've been learning about the Forth programming language and after a lot of searching online (in vain) for a Forth interpreter for the TI-84, I decided to write one myself. It's been fun demoing this to others, because it's a very unexpected use of a calculator. It's my largest project to date, and I'm interested to know what the HN community thinks, please feel free to critique my code! -- Ben
2018 · its alternatives →
- 7
1+2=3▲58A hilarious brain messer about kid maths with 1, 2, 3!
2016 · apps.apple.com · its alternatives →
- 8
Stephen Wolfram's new book on the Wolfram Language
2015 · wolfram.com · its alternatives →
- 9IG
I’ve always found that online calculators tend to have bad UIs, especially on mobile. Most of the calculator websites I’ve come across use outdated and inconvenient ways of inputting data, or they format the results in confusing ways. I’ve noticed that fraction calculators (especially mixed fractions) are terrible to use, even on desktop. I haven’t built one of those yet, but it’s something I’m planning to tackle soon. This is a project I’ve always wanted to work on, but I’m relatively new to this space. So far, I’ve created a collection of simple calculators focused on math and finance. I’d…
2025 · its alternatives →
- 10
I've been playing with this for quite some time and I think it's finally ready for public consumption. All feedback welcome.
2025 · madmonk13.github.io · its alternatives →
- 11IM
Recently moved to Egypt, and in dire need to get the numbers down. Great excuse to explore learning software some more. Possibly very niche, but maybe it is useful for someone else out there. Feedback is always welcome.
2023 · arabic-numbers.koljapluemer.com · its alternatives →
- 12
Hey HN, I wrote a short book about the fundamental aspects of Clojure. The target audience is programmers with at least minimal experience who want to learn how to express solutions in Clojure (and perhaps in LISP, generally). If the price is a bit too steep for you, send me an email (address in bio), and I'll provide a discount coupon. If you can't afford it all, and believe the material may help you for studying or interview preparations, I can send you a free copy.
2025 · leanpub.com · its alternatives →
- 13EE
Hey, guys and girls :) Please notice, that my intention is not to advertise my project here, but to ask for your advice. Long story short: we've noticed that it's very hard to "sum-up" any idea on one page and share it without using a blogging platform. Let's say you want to collect and present your point of view on "IA reaserch". You can write a blogpost or use social media to share your opinion (that would reach limited amount of people though). We really missed a tool that allows you to embed a lot of different resources on one page and than to share it with one link. This way you can…
2013 · its alternatives →
- 14
Hi HN! I kept hearing about Lisp and why it was special but didn't have a great place to start. I wanted something self-contained that helped me develop intuition rather than fluency. My hope is this is helpful for casual programmers, professionals from other fields who interact with code, or engineers who haven't had much exposure to interpreters or compilers. Hope this helps anyone else who's curious about getting a sense of Lisp and what makes it special with a limited time investment! Feedback or other cool Lisp things welcome :)
2022 · github.com · its alternatives →
- 15
Probability involves a lot of extra-mathematical concepts and funny transforms. I have always had a hard time internalizing it. When I heard a couple years ago that Lemurs are actually capable of abstract math, that gave me a bit of motivation to try to finally conceptualize probability in terms of whole numbers, counts, geometric shapes, basically easy-to-remember mathematical primitives. This book might be interesting to folks interested in predictive science, research, or just anyone who may have taken probability or statistics and might like a refresher on some of the edges of these…
2022 · leanpub.com · its alternatives →
- 16TH
I was reading Chappe and Chaudhary's essay The Supermanagerial Class, by way of a comment (2) and kept getting confused about which article I was reading, because the next tab over was Tetzeli's A Short History Of The Most Important Economic Theory In Tech (3). It's a little disturbing when you're reading about Nazi Germany and realizing the economic model there sounds a lot like the top post on Hacker News about an economic model for Silicon Valley. (1) https://lareviewofbooks.org/article/the-supermanagerial-reich/ (2)…
2016 · its alternatives →
- 17
Hi HN! I had a math idea whose thread I've been pulling on, and ended up creating this concept of Space Numbers. To read about it, see the pdf at the linked repo: https://github.com/abidsikder/space-numbers I'd appreciate feedback and ideas about the concepts, as well as further mathematical topics to take a look at that might be related, thank you all!!
2024 · github.com · its alternatives →
- 18
Hi everyone, I’m a student with a strong interest in computer science and complexity theory. Recently, I worked on a manuscript attempting to prove that P ≠ NP. I know how this sounds — it’s one of the hardest and most debated problems in CS, and many have tried and failed. I don’t claim to have the final answer, but I believe the approach I used might at least offer some fresh perspective or provoke useful critique. The idea involves geometric separation between deterministic and nondeterministic computation, using high-dimensional lattice constructions and some physics-inspired intuition.…
2025 · zenodo.org · its alternatives →
- 19SM
In past few weeks, I wrote several chapters to learn Scheme, a programming language of the Lisp dialect. The writing is not final as many chapters are missing. I wrote this because I wanted to improve my Scheme knowledge and increase the (low) number of Scheme literature. The writing is inspired by Calculus Made Easy, which I learned about here on HN. This is why I'm sharing it here. But keep in mind that my writing style is not as good as that in the above-mentioned inspiration. Feedback is very much appreciated.
2024 · schememadeeasy.com · its alternatives →
- 20IC
https://isometricks.com Here I want to present you the project I loved to work on the last months: isometricks. Please have a look, and play with it! Incoming features: - color selector for each 'face' - eraser And a handful of others improvements that I have in mind. Please comment, I would really appreciate any feedback. Open source and open to collaboration on GitHub: https://github.com/NicolasLetellier/isometricks Thanks!
2020 · its alternatives →
- 21IM
I learned about the Monty Hall Problem recently. I thought it was so interesting it inspired me to make this small interactive website about it.
2024 · evanconway.github.io · its alternatives →
- 22
Contribute to DmitriGoloubentsev/LLM-Tests development by creating an account on GitHub.
Aug 2026 · github.com · its alternatives →
- 23PN
Erdős Number is an individual's "collaborative distance" to Paul Erdős. I calculated the "PG number" for everybody Paul Graham thanks in his essays. I then recursively found their blogs, and extracted the people that they thank in their essays. This is still a work in progress. The data is open-source and I'm continuing to add edges on Github (linked on the website).
2023 · pgnumber.com · its alternatives →
- 24IA
Hey HN, I am making an 8-Bit CPU in Logisim and blogging about it.t's nothing fancy, really simple, unoptimized dumb CPU for sake of learning. I am no electrical engineer, I am just a self-taught dude who has programming as a hobby and wanted to dive deeper into abstractions. So here it is, so far I wrote 2 parts: [links redacted] I welcome any and all critique and feedback, as I can be wrong about everything for sure.
2017 · its alternatives →
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- I'm 17 and I created a Forth interpreter for the TI-84+ calculator alternatives
Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →