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Queueing Theory v2: DORA metrics, queue-of-queues, chi-alpha-beta-sigma notation

https://github.com/joelparkerhenderson/queueing-theory
1•jph•9m ago•0 comments

Show HN: Hibana – choreography-first protocol safety for Rust

https://hibanaworks.dev/
2•o8vm•11m ago•0 comments

Haniri: A live autonomous world where AI agents survive or collapse

https://www.haniri.com
1•donangrey•11m ago•1 comments

GPT-5.3-Codex System Card [pdf]

https://cdn.openai.com/pdf/23eca107-a9b1-4d2c-b156-7deb4fbc697c/GPT-5-3-Codex-System-Card-02.pdf
1•tosh•24m ago•0 comments

Atlas: Manage your database schema as code

https://github.com/ariga/atlas
1•quectophoton•27m ago•0 comments

Geist Pixel

https://vercel.com/blog/introducing-geist-pixel
1•helloplanets•30m ago•0 comments

Show HN: MCP to get latest dependency package and tool versions

https://github.com/MShekow/package-version-check-mcp
1•mshekow•38m ago•0 comments

The better you get at something, the harder it becomes to do

https://seekingtrust.substack.com/p/improving-at-writing-made-me-almost
2•FinnLobsien•39m ago•0 comments

Show HN: WP Float – Archive WordPress blogs to free static hosting

https://wpfloat.netlify.app/
1•zizoulegrande•41m ago•0 comments

Show HN: I Hacked My Family's Meal Planning with an App

https://mealjar.app
1•melvinzammit•41m ago•0 comments

Sony BMG copy protection rootkit scandal

https://en.wikipedia.org/wiki/Sony_BMG_copy_protection_rootkit_scandal
1•basilikum•44m ago•0 comments

The Future of Systems

https://novlabs.ai/mission/
2•tekbog•44m ago•1 comments

NASA now allowing astronauts to bring their smartphones on space missions

https://twitter.com/NASAAdmin/status/2019259382962307393
2•gbugniot•49m ago•0 comments

Claude Code Is the Inflection Point

https://newsletter.semianalysis.com/p/claude-code-is-the-inflection-point
3•throwaw12•50m ago•1 comments

Show HN: MicroClaw – Agentic AI Assistant for Telegram, Built in Rust

https://github.com/microclaw/microclaw
1•everettjf•51m ago•2 comments

Show HN: Omni-BLAS – 4x faster matrix multiplication via Monte Carlo sampling

https://github.com/AleatorAI/OMNI-BLAS
1•LowSpecEng•51m ago•1 comments

The AI-Ready Software Developer: Conclusion – Same Game, Different Dice

https://codemanship.wordpress.com/2026/01/05/the-ai-ready-software-developer-conclusion-same-game...
1•lifeisstillgood•53m ago•0 comments

AI Agent Automates Google Stock Analysis from Financial Reports

https://pardusai.org/view/54c6646b9e273bbe103b76256a91a7f30da624062a8a6eeb16febfe403efd078
1•JasonHEIN•57m ago•0 comments

Voxtral Realtime 4B Pure C Implementation

https://github.com/antirez/voxtral.c
2•andreabat•59m ago•1 comments

I Was Trapped in Chinese Mafia Crypto Slavery [video]

https://www.youtube.com/watch?v=zOcNaWmmn0A
2•mgh2•1h ago•0 comments

U.S. CBP Reported Employee Arrests (FY2020 – FYTD)

https://www.cbp.gov/newsroom/stats/reported-employee-arrests
1•ludicrousdispla•1h ago•0 comments

Show HN: I built a free UCP checker – see if AI agents can find your store

https://ucphub.ai/ucp-store-check/
2•vladeta•1h ago•1 comments

Show HN: SVGV – A Real-Time Vector Video Format for Budget Hardware

https://github.com/thealidev/VectorVision-SVGV
1•thealidev•1h ago•0 comments

Study of 150 developers shows AI generated code no harder to maintain long term

https://www.youtube.com/watch?v=b9EbCb5A408
2•lifeisstillgood•1h ago•0 comments

Spotify now requires premium accounts for developer mode API access

https://www.neowin.net/news/spotify-now-requires-premium-accounts-for-developer-mode-api-access/
1•bundie•1h ago•0 comments

When Albert Einstein Moved to Princeton

https://twitter.com/Math_files/status/2020017485815456224
1•keepamovin•1h ago•0 comments

Agents.md as a Dark Signal

https://joshmock.com/post/2026-agents-md-as-a-dark-signal/
2•birdculture•1h ago•1 comments

System time, clocks, and their syncing in macOS

https://eclecticlight.co/2025/05/21/system-time-clocks-and-their-syncing-in-macos/
1•fanf2•1h ago•0 comments

McCLIM and 7GUIs – Part 1: The Counter

https://turtleware.eu/posts/McCLIM-and-7GUIs---Part-1-The-Counter.html
2•ramenbytes•1h ago•0 comments

So whats the next word, then? Almost-no-math intro to transformer models

https://matthias-kainer.de/blog/posts/so-whats-the-next-word-then-/
1•oesimania•1h ago•0 comments
Open in hackernews

Show HN: I spent 4 months building Duolingo but for your life

https://three-cells.com
90•maghfoor•4mo ago

Comments

maghfoor•4mo ago
APP NAME - Three Cells: Your Life System

Some history: A couple of days ago my app finally got approved and released on app store.

Overall really happy with the release. Now I finally have something that I use every single day. Whereas previously I was using various different apps to journal, track habits, track my weight and manage tasks etc. Now I have all of that in one place.

Initially it was a website that I built for myself but I realised that something like this is better built in an app after speaking with lots of people.

I used Convex dev for my backend and that honestly made the backend part of creating this part very easy because I could just use the same structure I had for the web app. Convex was my choice because even for a website I wanted the data to always be in sync whether I access it on my phone or laptop.

The most annoying part about building an app is having to go through the review process of app store. For a website, I can just make a change and it can be live in less than a minute. But the app store review process alone took me 2 weeks to release this.

Using AI made migrating the website into an app really easy. I had some components like heat-maps and graphs which would have been really difficult to migrate over if I was doing this a couple of years back.

The idea itself actually came from reading lots of productivity books and then stumbling upon an interview from Jim Collins who talks about how he tracks his own life and makes sure it's going in a direction that he wants

pmcarlton•4mo ago
Does your app have a name?
maghfoor•4mo ago
Yeah, it's called Three Cells: Your Life System on Appstore
paulgerhardt•4mo ago
Impressive work for a solo effort.

Would love to see less front loading on the registration side - I fell off onboarding because I couldn’t get through the 12(!) page questionnaire.

The value proposition is clear, just let me use the app. Notes (my current solution for this) doesn’t make me read summaries of other people’s research every time I open the app :-)

joshuanapoli•4mo ago
Yeah, maybe it would be nice to have a fast-track onboarding option for common goals: lose weight, finish homework or chores, etc.
maghfoor•4mo ago
Thanks for the feedback, I will implement something to skip onboarding maybe for users who clearly understand the value proposition
iammjm•4mo ago
I agree. And I dont understand how this isn't a universal rule for all of software: let the user use the thing ASAP. Just let me fucking play with it instead of forcing me to read intros, watch videos, click through a tutorial, etc. Just let me explore and interact! And only then also offer me some guidance that I can jump in and out of.
thefourthchime•4mo ago
I couldn't agree more, for any apps I make I try to make the on boarding zero
mhb•4mo ago
FWIW: Your initial proposition, "Your days are slipping away." is a negative framing. Maybe this is a good way of appealing to people's fears, but I thought it was depressing and was not eager to read more.

An alternative could be something like "Make the most of your days".

maghfoor•4mo ago
Dude, that is so true. I think I agree with you and your reframing. Going to change it to that
maghfoor•4mo ago
And just like that, changed it in under 1min. Beauty of web dev.
bdangubic•4mo ago
you should reconsider, make the most if your days sounds like new years resolution that will end by the time you run of of ham
iammjm•4mo ago
I think your comment is more a statement about you and your past experiences, because I vibe with "make the most of your days" in a positive way
Dilettante_•4mo ago
Sounds like soulless generic ad copy that you see everywhere to me(respectfully, that's just how I read it).
bdangubic•4mo ago
carpe diem eh? never heard that before :)
mhb•4mo ago
That's fine. I'm not saying that particular example was great. Just that it might be better to have a positive rather than a negative "vibe".
integralid•4mo ago
I actually think about my life slipping away almost daily, but the reframing works too.
iglio•4mo ago
You could consider running an A/B experiment, and track which treatment users engage with most.
watwut•4mo ago
I think that I have heard or read "Make the most of your days" in various ads and inspirational motivators too many times. It is something that makes me ignore whoever is saying it, because it was overused by everyone else.
est•4mo ago
Off topic, anyone building Duolingo alternative?

I find the duolingo course very slow paced, gems and gamifications are just bad.

dalejh•4mo ago
Not a duolingo alternative, but I recently built a (WIP) web app for journaling in your target language with LLM-powered feedback and in-context word discovery.

I built it for myself as I wanted to practice writing in my target languages, while also wanting to learn new words... The idea was that hopefully I would remember the words if I could associate them to my journal for that day.

It's a little clunky, but give it a go if you're interested!

Right now it's a bring-your-own claude token model, but let me know if you're not comfortable with that.

https://lingolog.app/

visava•4mo ago
I am trying prospanish (prospanish.co.uk) free lessons on youtube. I think this approach of pyramid/Lego learning is fastest and easiest way to quickly learn how to converse.
chamomeal•4mo ago
I started watching Dreaming Spanish videos and started improving like 10x faster than with duolingo. At least with comprehending other people speaking.
watwut•4mo ago
If it is too slow paced for you, then you are not looking for duolingo alternative. You are looking for something entirely different. The whole Duolingo deal is fun, relaxing, low effort learning in exchange for slower progress.

And of course there are competitors, many of them. There are also many free language learning resources. But, you did not said which language you are learning and whether you are beginner or not. And most of free resources are made for specific language.

neobrain•4mo ago
There's https://lingonaut.app/ , which is not open-source but at least open data. It's sort of like early-days duolingo with volunteer-driven courses. Some of the courses are surprisingly well thought out (if yet to be implemented to a usable extent), but quality will be mixed. I don't think they have an answer for proper pacing at the moment, but being a free product they're at least not incentivized to keep you repeating the same content indefinitely.

I'm getting a lot out of Anki with premade decks these days, combined with watching tons of video content.

rjh29•4mo ago
Sounds like you actually want to learn a language. You don't need a duolingo alternative, you need youtube, textbooks, podcasts and grinding vocab on Anki.
runarberg•4mo ago
Specifically for Kanji I am building shodoku.app

It is very different from duolingo though. No gamification, only two types of cards (reading and writing) every card has basically all the information about that kanji available from the dictionary. Content is sourced directly and unaltered from a couple of open sourced dictionary, so no AI or content writing either.

ljf•4mo ago
Equally, feels like there should be a duolingo marketplace - want to learn electronics, maths, history etc through the duolingo framework - could be 'short' courses type materials, or ongoing/never ending type learning.

I've bought a few courses from various places, but I want bite size and daily learning.

peppetv4•4mo ago
Nice! Exactly the things i try to log in my daily note, with the addition of streak visualization, boom! How is the data stored? Didnt find anything on the site, exportable?
maghfoor•4mo ago
Thank you for the lovely comment!

It's stored in a VPS hosted convex backend. I'm currently building functionality to export data :)

apprishiate•4mo ago
Hey, congrats on the launch! I think the onboarding was really interesting -- love the different illustrations. For consumer apps, everything needs to be as easy as possible, because you're competing with YT Shorts, TikTok (crack-level distractions). On iOS, I hit one roadblock where the keyboard blocked the "next" button -- small detail, but that required some thinking.

I was also keen to see how the whole system fits into my life before I paid, and since it take 66 days ;) I thought it would be nice to see if it actually worked before I decided to pay. Just a thought. I almost made it all the way through!

Curious how you used AI to migrate the website into an app. Could you share more about that process?

Great job -- shipping something is always exciting and doing so in such a short timeframe is something to be proud of.

maghfoor•4mo ago
Hey thank you so so much for the thorough feedback, it's very much appreciated! I will have a look at these bugs and fix them. I mostly just get time to work on this on weekends and evenings so progress is a bit slow but better than nothing nonetheless
zft•4mo ago
anything like this but for android?
ileonichwiesz•4mo ago
You could build a solid alternative in Google Sheets in a couple minutes. It’s basically a simple visualisation of a database table with 4 columns.
dalejh•4mo ago
This looks nice! Do you plan to build integrations to do some fitness auto-tracking? For example apple fitness, or garmin connect?
maghfoor•4mo ago
Haha funny that you mention that because yeah I would like to have that in the future. it would be nice to have all my Strava data synced into this sometime in the future
akudha•4mo ago
What is the reasoning behind the pricing model? 2.99 weekly but only 29.99 for lifetime?
maghfoor•4mo ago
If I'm honest I haven't thought about it fully yet but atm I felt comfortable enough to give access for 29.99 forever. And if users don't want to spend that much and maybe only want to try it for a couple of weeks then they can get on the weekly plan with a free trial
aaronsnow•4mo ago
Congrats, maghfoor. But the lack of price transparency is a real turn-off. Nothing on the website or in the App Store — you have to download the app to find out how much it will cost you.
j_bum•4mo ago
For what it’s worth, in the iOS App Store, you can scroll down to look at the “In-App Purchases” drop down menu, and all of the prices are shown there.

This is true for every app with IAP. It’s how I typically decide if I’ll download an app with IAP.

crazygringo•4mo ago
That's helpful, thank you.

But I'm not even going to bother looking if an app can't clearly advertise its price.

It just feels like a dark pattern, like they're intentionally trying to trick me from the very start.

Maybe the price will turn out to be fine, but it's sure not building trust from the start.

buzzerbetrayed•4mo ago
That is the standard way to advertise your price in the App Store. What is more transparent than.. clearly posting your price?
crazygringo•4mo ago
I'm talking about the website that has been posted.
arcfour•4mo ago
Making the app cost X amount makes it immediately obvious how much it costs. IAP do not share this, even if they are posted publicly off in some corner.
aaronsnow•4mo ago
Wild. I've been using iPhones for 17 years and it took until today for me to learn this. Thanks j_bum.
rplnt•4mo ago
There is no free option, so hiding it under IAPs is kinda shady too.
dexterdog•4mo ago
So how much is it for those of us non iOS people?
conductr•4mo ago
My guess is it’s unavailable since it’s an iOS app
dexterdog•4mo ago
I meant how much is it since I can't install it to find out
zamadatix•4mo ago
Anyone should be able to view it, even without an Apple account: https://apps.apple.com/us/app/three-cells-your-life-system/i... (bottom right):

> Three Cells Weekly $2.99

> Lifetime Access to Three Cells $29.99

> Three Cells Weekly $2.99

The ratio here feels a bit off, $155.48/y or $29.99 for life screams "trying to push you to pay a lot for an app I know you won't stick with" rather than "we've got great value options for any type of user". There is a 7 day trial as well, so even more confusing as to which kind of user is supposed to want the weekly payment.

WA•4mo ago
Insanely expensive weekly subscriptions are the new (scammy) meta in B2C apps. I find it off-putting as well.
wildzzz•4mo ago
People are just hoping they can skip from "hobby project" all the way to a project that funds a couple salaries just by overcharging for subscriptions. Apps that are meant to cater towards unorganized people are the worst for this because they know you won't stick with it. A week trial is just short of how long you'll likely use it before you forget or realize it's not working for you.
askl•4mo ago
Is "Duolingo for X" supposed to be a good thing?

Duolingo is just another mobile game, but pretending to be a learning app.

bitmasher9•4mo ago
I think so. Duolingo for X means low friction, lots of positive feedback, and probably more healthy then doomscrolling
askl•4mo ago
True, but "more health than doom scrolling" is like saying "more healthy than shooting yourself in the foot".
andrewrn•4mo ago
Does anyone know what makes habit trackers such a trendy project in the last few years? In a world of possibilities, why do so many people make so many habit trackers?
barbazoo•4mo ago
Everyone thinks it’s what they need until they realize they don’t.
jitl•4mo ago
My take is that the right workflow for people is quite varied. Everyone wants something that’s low friction and will keep them engaged but these daily behaviors are fundamentally high friction habits, so existing solutions are rarely satisfying in the long run.

They are also easy to build - you need one primitive: basic text storage, although scheduled push notifications are great to have. No need to sync stuff, no sharing/permission model, no scale issues you can’t solve with a b-tree SQLite index.

I think another factor is an increase in productivity-lifestyle content influencers, the sort of people who talk about Notion on TikTok. Speaking of Notion there’s like a zillion user-created habit tracker templates for Notion too. I work at Notion but don’t use it daily outside of work.

accrual•4mo ago
> My take is that the right workflow for people is quite varied.

I agree. I've been tempted lately to write my own local todo + notes + calendar app that fits the way I think about tasks and time. Kind of like developing a software glove for ones mental model. It's no wonder there are so many "gloves" in this space, everyone's model is unique.

jitl•4mo ago
I would like notion to support this kind of glove making perfectly but right now it’s too slow and high friction to make sense for the domain for most people. Currently it only works for people with huge friction tolerance, and it’s missing quality calendar tooling & trustworthy configurable push.
vunderba•4mo ago
> Productivity-lifestyle content influencers

100% this. They fall into the same camp as "self-help books", "life coaches", and to certain extent "spiritual gurus".

theshrike79•4mo ago
It's the same with mobile games.

There are only a limited number of game mechanics, people install for the theme and come back because of it.

You can take a 1:1 copy of a game, reskin it 12 different ways and 1 of those might be a hit.

For apps like this there aren't that many ways to track what you're doing, but people like different kinds of UX.

maghfoor•4mo ago
For me personally I did try a lot of these habit trackers and notetaking systems and none of them quite worked for me so I just decided to build something that's very specific to how I like things. I didn't just build a habit tracker or whatever just for the sake of building another one, I built one that specifically suits my needs.

Usually what happens is a lot of other people in the world also feel the same way as me and if they like how I have approached the app then they would download it and use it and I think that's how you get a lot of different types of habit trackers coming up all the time

askl•4mo ago
They are a great little project to procrastinate from doing something useful.
rjh29•4mo ago
They are easy to make and people are very opinionated about what works best for them. Although I'm close to 40 and I feel like they mostly don't help at all. If you're motivated you don't need them, and if you're not motivated they won't motivate you.
CamelCaseName•4mo ago
Am I missing something? Is this really worth being at the top of HN?
dvrj101•4mo ago
Tough talk given your post history mate
mkbkn•4mo ago
Any ETA on the Android app? Or mobile web?
quijoteuniv•4mo ago
If you are so innclined the app may serve, but reality is that you are who you are and any attempt to force your unconscious is going to fail. Be nice to yourself
rootsudo•4mo ago
On the pricing, it feels a bit pricy for lifetime, though something like $10 yearly would be probably better all around but does ruin the position of full purchase so

It isn’t a bad deal at $30 but it’s just enough for me to go “oh” and not really open the app/push through.

pavel_lishin•4mo ago
This is neat, but I already have a todo app that lets me tag tasks; I think this is not for me.
lesser-shadow•4mo ago
Android version?
sebular•4mo ago
Congratulations! Beautiful design, very simple and appealing. The onboarding flow filled me with optimism, which I appreciated.

That said, I bounced off at the pricing. The $30 lifetime price isn’t something I find inherently too expensive, but I need to see if the app works for me before committing to it. It was weird that if I went forward with the free trial it would automatically put me on the exorbitant $3/week price. That option was repellent and got me worried about forgetting to either cancel or make the purchase. Compounding the issue was uncertainty about whether I even _could_ make the lifetime purchase after accepting the free trial.

Then I lost momentum and started thinking about how I was about to drop $30 on an app that’s just some HN poster’s 4-month project, and I have no clue how crippled it will be if (when) you decide to shut down the API.

If you’re confident the app itself is habit-forming, I’d recommend just letting people use it for a couple weeks and then hitting them with the paywall. And when you’re asking for that kind of money and using the word “lifetime”, I’d describe how you’re going to guarantee that to the user, even if they’re the only person who ended up buying your app.

Edit: Now I’m stuck on the payment options screen with no way to delete my account. Not happy about that.

maghfoor•4mo ago
Thank you for a thorough review. It's very helpful honestly. You raise some valid concerns I will make the following changes.

- I will add an option for the user to delete their account upon hitting the paywall if they don't want to continue. - I didn't want the app to be free to begin with as it doesn't attract serious users and also because I'm an indie maker and free users is not something that I can ultimately afford at this current stage. - You're right, I should have a way for the user to trial the app and then pay once instead of the trial being on the weekly subscription only.

As for guaranteeing lifetime access, a lot of web based products offer lifetime access and I guess it's just a matter of trusting the maker if they will support it. For my particular app I know that I've been involved in the productivity space for quite some years and only now making an app that suits my needs. I imagine myself using this for all the years to come and if I stop using it, it's self hosted on a server I own and I will keep it live forever. If the user doesn't trust that then that's completely fair and fine. No issues with that.

Lots of useful feedback, thanks again for the write up! Still building and learning and trying to be as genuine as possible.

chrismatheson•4mo ago
I actually got stuck with a bug in the flow. "What drives you" I couldn't seem to move on from this step, no button visible (maybe my old device for factor (iPhone mini 12)

But I also would have bounced on the "free trial, auto payment after" I understand the thinking around them, but for me it's just not a pattern im ever going to opt into. It feel predatory, you will probably forget and then ill get some amount of "months" off you. Like gym memberships.

chrismatheson•4mo ago
FWIW I have a few app ideas that are about lifestyle / personal system. and i've thought about pricing strategies etc, specifically to balance "the Ick" with what I know are proven industry standards that Do maximise conversions & profit, and what I think is more personally palatable. (no real word experience though)

I would be much more likely to convert if the "trail" as months maybe years instead of days or weeks (this is a lifestyle thing after all, if customers find it genuinely useful and buy into the system for months then $30 a year is nothing)

OR

free-trial followed by locked out. No "automatically start billing"

standalonematt•4mo ago
One thing I noticed is the app doesn’t support larger fonts very well. Kind of a deal breaker for a lot of us. For example the login screen has text that overlaps making it very difficult to read or use.
maghfoor•4mo ago
noted, thank you for the feedback. I will improve on this. Didn't test this case during my development phase. Much appreciated
standalonematt•4mo ago
Thanks for the quick response.
thorncorona•4mo ago
Your app doesn’t support dark mode :(
ileonichwiesz•4mo ago
What’s the value proposition here, exactly? You could replicate this functionality 1:1 by using a very simple spreadsheet with a couple charts - it wouldn’t take more than half an hour to make, you’d retain full control over your data and you wouldn’t have to pay $3/week for a product that can disappear at any time.
chrismatheson•4mo ago
<insert link to HN comment on dropbox>
hereme888•4mo ago
If there was an Android version, I would have gotten it. The privacy agreement seems adequate enough on my first read.

Unfortunately I'm not leaving Android for iOS, so I wish you success and eventual expansion to Android.

wingerlang•4mo ago
Does filling the entire landing page with only "punchy" sentences actually work? It feels like I am reading a trailer.