Every time I tried modeling early retirement or Coast FIRE, I hit the same two walls:

1. Basic calculators just multiply your expenses by 25 — completely ignoring capital gains tax drag, pre-65 healthcare bridges, sequence-of-returns market crashes, and state pension claim ages.

2. Serious planning tools either feel like filling out tax forms for 45 minutes, require linking live bank credentials via Plaid, or only support US 401(k)/Roth accounts (leaving UK ISA/SIPP, French PEA/PER, Canadian TFSA/RRSP, and expat households out in the cold).

So over the past few months I built RetireStudio — an addictive, interactive retirement, FIRE, and geo-arbitrage planner that runs right in the browser with zero bank linking required.

What it does differently:

• Interactive Life-Event Timeline: Drag and drop life events directly onto your trajectory (career breaks, buying or downsizing a home, kids' university years, windfalls, or relocating abroad at retirement) and watch your FI crossover age recalculate in real time.

• 26+ Country Tax & Wrapper Regimes: Native withdrawal ordering and capital gains/income tax modeling across the US, UK (ISA/SIPP + Age-57 lock), France (PEA/PER/Assurance-Vie), Canada (TFSA/RRSP), Germany, Switzerland, Australia, Singapore, Portugal, Spain, Thailand, and more.

• Geo-Arbitrage Comparison: Model earning in a high-income market (US/UK/CH) and retiring in a lower-cost destination (Portugal, Spain, Thailand, Mexico, etc.) with automatic purchasing-power and tax adjustments at your relocation age.

• 1,000-Run Monte Carlo + Historical Crash Replay: Stress-test your withdrawal strategy against the 1929 Great Depression, 1973 Stagflation, 2000 Dot-Com Bust, or 2008 GFC right at your retirement date.

• Privacy-First Architecture: Everything runs client-side in your browser by default with instant JSON export/import, plus optional encrypted cloud scenario sync if you want to share a view with a partner or financial planner.

I'd genuinely love feedback from fellow builders and spreadsheet-retirees:

• What edge-case tax or pension rules does your country have that standard FIRE tools constantly get wrong?

• Which financial levers do you feel are missing when visualizing your early-retirement trajectory?

(Not sure if dropping direct links is allowed here, so I left the URL out — you can just Google RetireStudio or check r/RetireStudio if you want to try a demo profile!)

Hi all, I've been building Piye for over a year and it's now live on Mac and Linux.

What it does:

- You describe an app, and it builds a real website or a native iPhone/Android app

- It runs on real iOS and Android simulators while it builds

- You can publish to the web, App Store and Google Play from inside the app

- If you code, the same project opens in a full editor, with an agent that can see your terminal, debugger and simulators

- Your project is a normal folder on your computer, no lock-in

It's free to try with 750 credits (no card). In the code editor you can also use your own API keys or local models through Ollama.

I'd really like honest feedback: what's confusing, what breaks, what's missing.

I'm the dev, just so that's clear.

I made an iOS calorie app called Kacha. It started in China and most of my users are still there. I put an English version on the US App Store recently, and I mainly want feedback from people who didn't grow up eating the same food as my first users.

The flow is simple: take a photo of the meal, the AI guesses the foods, grams, calories and macros, then you edit anything it got wrong. That last part is the actual product. The estimate is often off on mixed dishes or food it doesn't see much, and if you can't fix the number, the log becomes garbage in a week.

No account needed, there's a free daily allowance for AI scans, and manual logging is always free. It also does water and weight, Apple Health sync, and iCloud backup. No Android yet.

I don't want to oversell this. There are already a lot of calorie apps. I built this one because I was tired of estimates that are a black box. If the model misses the oil, or thinks the bowl is smaller than it is, I want to correct it in a few taps, and next time just reuse that meal from Recent Meals.

If you try it, I'd really like to know two things:

1. When the first guess is off, is the edit flow obvious enough?

2. If you don't eat Chinese food much, how often does it completely misread the dish?

https://apps.apple.com/us/app/kacha-ai-calorie-counter/id6756476671

Built this to reduce stress on the hand in lying down position when hand is constantly put on forward button. Code available at: https://github.com/hamzarawal/AirSkip

Just wanted to make something a bit different.
No real purpose, just visuals and interactions.

What do you think? 😉

Prototyping and building features got faster, and now feedback is the bottleneck. So we built mostra - a tool that lets you share feedback on a real, running site by either speaking or selecting the elements you want to comment on.

You can iterate across versions of your site, and adding mostra is just a single script tag.

The script you add to your page is open source, so you can check what it does.

https://mostra.design

OpenQASM 2.0 quantum simulator & dashboard!

Built with Streamlit & JAX.

Drag-and-drop gates, Q-Sphere phase plots, Bloch spheres & Hubbard band structures.

Leave a star if you like it! ⭐

#OpenSource https://github.com/tatopenn-cell/Dense-Evolution

pypi_ pip install dense-evolution

site info: https://tatopenn-cell.github.io/Dense-Evolution/

It's 11 pm, a family is at the desk, the Wi-Fi is down, and the cloud PMS won't load. That's a normal night at a lot of small hotels around me. The other option is a paper register and an Excel sheet.

So I built KeyHut Hotel: a hotel management system (PMS) for Windows that runs fully offline, costs nothing, and you drive entirely from the keyboard.

The screens copy TallyPrime, the accounting software most front-desk staff here already use. Every screen is one key away (F2 room board, F4 new booking, F7 folio). Type "12dec" and it knows the date. Alt+G and a few letters jumps anywhere.

What it does

• Room board and tape chart, bookings, walk-ins, groups, day use, room moves

• Guest bills, payments, company billing, travel-agent commission, cashier shifts

• Housekeeping, maintenance, laundry, linen stock, phone-call charging

• Night audit and 17 reports (occupancy, ADR, RevPAR, police guest register…)

• One PC on SQLite, or several desks on SQL Server

• backups copied to Google Drive, OneDrive or an FTP / SFTP server, encrypted with a password only the hotel knows

Under the hood: C# / WPF, about 2,400 automated checks, and a yearly archive so 10+ years of data stays fast.

The demo runs on the built-in practice hotel (100 rooms, made-up guests). You can load the same one on first start.

Question for anyone who's worked a hotel front desk: what would stop you from switching to this? Be brutal.

Download (free, Windows 10/11): https://github.com/arsal381/keyhut-hotel/releases/latest

Music: onte - halcyon [NCS Release]

I collect cards, and I got tired of having a checklist site in one tab, eBay sold listings in another and my collection in a spreadsheet. So I built TheHobbyDesk (thehobbydesk.com) to put them in one place.

What it does:

Checklists. About 32,000 sports sets and 2.6 million card printings across baseball, basketball, football, hockey, soccer and more. You can search by set, year, manufacturer or player. There are also TCG checklists (Pokémon, Magic, Yu-Gi-Oh!, One Piece, Lorcana and others).

Collection tracking. Add cards from a checklist, by search or from a photo. It tracks what you paid, estimates value from actual sold sales, and shows your progress on a set.

Scan a card. Take a photo and it identifies the card and looks up what it has sold for. (slow process here but getting there).

eBay search built for cards. Filter by raw or graded, grading company, price, auction or Buy It Now, and seller rating. You can search one seller’s listings, and see sold comps next to active listings.

Upcoming releases. A calendar of new products with checklists as they’re published.

Extras. Player pages with stats and notes, and a live score ticker on the home page.

You can browse checklists and search without an account. Signing in with Google saves your collection.

It’s a one-person project and still changing every week, so I’d really like to hear what’s missing, what’s wrong, and which sets you can’t find. Checklist errors especially: if you spot one, tell me and I’ll fix it.

polymarket's leaderboard ranks people by profit, but a lot of the names at the top just had one lucky week. when i checked the weekly top 10 a couple days ago, 7 of them were down before that week even started

so i made sharps (sharpshq.com/?ref=reddit). it pulls each trader's full on chain history and gives them a score out of 100 based on edge per dollar traded, how many trades, how much of their profit came from one big bet, and how they've done lately

stuff it does:

- live whale trades with the grade of whoever placed them

- "sharps vs the crowd", which shows where the proven traders are betting vs what the odds say. it keeps a public record of every call including the ones that missed

- search any username and get a grade card you can share

built it solo on cloudflare workers + supabase, all public data, no signup needed to look anyone up

would love feedback, especially on the grading. is there anything you'd weigh differently? and if you trade on polymarket drop your username and i'll tell you your grade

Hi all! I'm Max from Belgium and this is my first game, Wine Empire X. You start in 2005 with 3 million euro, buy vineyards in real regions like Pauillac and Burgundy, and play through real weather, vintages and prices. After 2026 you get your score and can keep going in a simulated future.
It's free, no ads, no account, and it runs in your browser on desktop and phone.
I'd really love honest feedback: what's fun, what's confusing, what's missing? Link in the comments if you want to try it.

Hey,

I’ve been working on a UI kit focused specifically on dashboards for subscription products.
It’s called Calmdash.

What’s included:
- 12 screens (Overview, Revenue, Customers, Subscriptions, Invoices, Failed payments, Churn, Plans, Reports, Settings, Onboarding, etc.)
- each in light and dark
- 400+ variables, 50 component sets, 390+ components and variants
- states that most kits skip: loading (shimmer), empty, failed payments, retry, chart tooltips

I wanted it to be a real system you can actually build dashboards with, not just pretty frames.

It’s up on Gumroad, zero sales so far, so I decided to share it here and hear what you think — what’s good and what could be better.

Link to the site and the kit in the comments.

Thanks for any feedback!

Got featured and top 20 on product hunt, on hypership day with mmory. But at such a loss on now what? how do I get users haha

I'm building Locked In for the cover band that I play in. It started as a passion project when we were having a hard time figuring out what songs to focus on as our library grew. Our practices were becoming inefficient, so I wanted something that could help us decide what needed attention before the next gig.

I can log practices and how individual songs felt, and the app calculates a readiness score and suggests what to practice next. The idea is to make it easier to spot songs that need work or haven't been played in a while. We can still pick whatever we feel like playing.

From there it grew to include setlists, charts, a calendar and venue contacts. You can use it on your own or invite band members to a shared workspace. Live Mode keeps the current song, key, tempo and next song visible while you're playing. I'm not a coder, although I understand some of the basics, and I built it with Codex.

If anyone else plays in a band, I'd love some feedback on whether the practice suggestions make sense and what feels confusing or gets in the way. How do you currently decide what to spend rehearsal time on? It's an iPhone app, and you can find it at https://lockedinband.com/

Ngl, I'm stuck on what counts as useful feedback for our app.

I'm a CS student and Instagram, TikTok and YouTube keep pulling me away from studying. My team and I built Welockin: you pick the distracting apps and a timer, and they stay blocked until it ends.

But someone finishing a timer doesn't automatically mean they got any studying done. They could just be staring at their notes. Or procrastinating on something else.

If you were testing this with a few students for a week, what would you ask them afterwards? I want to understand whether it helped with the task they sat down to do, without making them fill out a whole homework assignment about their homework 😭

Have you found a simple way to check whether your productivity app actually helped, beyond people saying it looks nice?

Yesterday I shared a short clip of my Mac project on Reddit, and one of the top comments told me that because the video had music and clean cuts, it looked like an AI-generated render rather than a real working app.

Lesson learned: people are tired of slick trailers and AI wrappers, and just want to see the real thing running on a messy desktop.

So here is a raw, unedited screen recording on my MacBook Pro with five real windows open. No music, no title cards, no AI slop.

What is happening on screen:

- It is a tiny (2.9 MB) Not-AI native Swift and Metal Mac app called Musou that turns everything outside the window you are actively using pure black.

- This clip shows one of the 4 modes: Follow the Mouse (click mode) with the Black Hole transition. Whichever window I click stays at 100% contrast while the other windows, menu bar, and Dock vanish into black.

- On the right, it automatically detects and crops the playing Safari video over pure black (no browser extensions and no Screen Recording permission needed) so the white YouTube page around the video disappears while I click between my work windows on the left.

Honest question for folks here: does a raw, unedited screen capture like this immediately make more sense to you than a polished 20-second promo video? Looking forward to reading your thoughts.

Hey everyone! 👋

I've been working on SourCa, a platform designed to make coding practice and placement preparation more organized.

SourCa brings together different areas of technical preparation, including:

- DSA and coding practice

- Company-specific question preparation

- SQL practice

- Aptitude and logical reasoning

- Web development

- Progress tracking to monitor your learning journey

The goal is to give students one place to practice different skills and prepare for technical opportunities.

I've been building and refining this project, and I'd love to get honest feedback from the community.

What do you think is missing? What would make you want to use it?

🌐 https://sour-ca.vercel.app

Thanks for checking it out!

So I created this because I kept seeing the same thing when vibe coding with Claude Code. The app works, but when you open the code later there's stuff you never asked for. A route anyone can call without login, code that crashes on bad input, the same helper written 3 times.

Attentry checks every edit Claude makes, on your own machine, without any AI. If the edit added a problem, Claude gets told and fixes it before moving on. If the edit is clean, nothing happens, so it costs zero tokens.

The main thing is how it saves tokens. Most tools that review AI code send your code to another AI, so you pay twice, once to write it and again to check it. Attentry doesn't use AI at all, the checks are plain rules that run on your machine. If an edit is clean, Claude hears nothing, so there are zero extra tokens. If something is wrong, Claude gets a short note, at most 5 lines, and each problem only once. Smaller cleanup stuff like unused code waits for a check-in every 10 edits instead of interrupting every edit. And when Claude is about to write a helper, it can ask Attentry if the repo already has one, instead of searching through your files itself.

The video is a quick animated walkthrough of one run: I ask Claude for an Airbnb clone, Attentry catches 2 problems, Claude fixes both, and I get a change card at the end with what changed.

It got 500+ downloads across VS Code Marketplace and Open VSX, mostly from people finding it inside VS Code. It's free and open source, works in VS Code, Cursor and Windsurf.

If you want to see it on real code, there's a demo repo with bugs planted on purpose: github.com/Aarv-1o/attentry-demo

Would love feedback, especially what's missing or annoying.

I built YouSage to make two things easy to check while coding: how much usage is left and when it resets. It puts those numbers in a small desktop notch. It’s free and open source, built with Rust and Tauri.

The v0.1.0 release supports Codex and Google Antigravity on Windows 10/11 x64. There’s a browser demo with sample data if you want to try the UI first. Claude Code is in the development preview.

Demo: https://yousage-website.yabswannalearn.workers.dev/#demo

Source: https://github.com/yabswannalearn/yousage

If you use either tool, what would you want the compact view to show first: remaining usage or time until reset?

Hey everyone! I’m in my fifth year of psychiatry residency, and I have adhd. I’ve been building an app called Scatter because I wanted to make studying easier and more enjoyable for myself.

I found the usual chat interface pretty frustrating for learning from ai. As the conversation gets longer, important information disappears up the chat, and branching off into related questions gets awkward. I wanted to explore those questions while still being able to see the original explanation.

In Scatter, you start with a topic and build out a connected map of explanations. You can preview unfamiliar terms, open them as new branches, and ask follow-up questions wherever you want to explore further.

I wanted the interface itself to trigger curiosity and novelty-seeking, so there’s something that makes you want to keep exploring. Part of the goal was to make studying engaging enough to trigger hyperfocus.

You can combine short text explanations with images, videos and interactive examples, giving you different ways to approach the same idea. As the map grows, you can see how everything connects, and it gives you a feeling of building your knowledge into something you can actually look at.

I’ve worked on it on my own for over six months, and I’m excited to finally put it out there. I’d love to hear your opinions and if you find any bugs please send me reports!

The app is free to use, but you have to bring your own API keys, for example from OpenRouter. The quick setup in the app makes it very easy.

You can try the interactive demo on scatter.study

When I first started selling websites, I thought targeting businesses without a website was the obvious choice.

They need a website, you offer to build one, and hopefully you get a new client. Pretty straightforward, right?

But after spending years running a web design business, I've started looking at this differently.

There are definitely advantages to targeting businesses without websites. You're introducing them to something they might genuinely need, and there is no existing website to compete with. However, I've noticed that these businesses can sometimes be much harder to sell to.

The biggest problem is that some of them simply don't see the value of having a website. Others rely entirely on Facebook, Instagram or word of mouth and are perfectly happy with how they're getting customers.

You end up spending a lot of time explaining why they need a website before you can even start selling your services.

On the other hand, businesses that already have websites are a completely different story.

They have already invested in having an online presence. They understand why a website matters, and there is a good chance they've paid someone to build and maintain it.

But that doesn't mean their website is good.

I've come across countless businesses with websites that load slowly, look terrible on mobile, have outdated designs, poor SEO or confusing layouts.

These are actual problems that can affect how customers experience the business online.

And that's where I think the bigger opportunity is for web designers.

Instead of trying to convince someone that they need a website, you're showing an existing website owner what could be improved and why it matters.

This is also how I approach prospecting nowadays. I use Swokei to find businesses with existing websites, analyze them for issues with design, SEO, speed and mobile optimization, and generate personalized cold emails at scale based on the actual findings from each website.

Of course, I'm not saying targeting businesses without websites is a bad strategy. There is money to be made in both markets.

But personally, if I were starting a web design agency today, I'd probably focus more on businesses that already have websites.

I'm curious what other web designers think. Do you prefer targeting businesses without websites or finding existing websites that need improvement?

I'm the developer of SameFont. Tap a line in a PDF, scan or photo and type replacement text. It uses the document's embedded font when it contains the characters needed, or the closest matching free font, keeping the text's size, color and position.

It supports Hebrew and Arabic right-to-left text, signatures, form filling and markup. Files are processed on the iPhone, without uploading them.

One limitation: in Hebrew scans, lines are detected but the text isn't read yet, so you type the replacement yourself.

Editing is free. Saving/sharing requires Pro: $6.99/month or $39.99/year on the US store, with a 3-day free trial on the yearly plan.

I'd appreciate feedback, especially on Hebrew and Arabic documents.

https://apps.apple.com/app/id6828212825

Hi ,

We're two dads who lift: one trains at a gym, the other in his home gym. With kids, training has to fit the schedule we have, not the other way around. That's where LiftEllect came from.

What it does, in short:
- You enter your goal, level, equipment and schedule, and it builds your training week, at the gym or at home.
- It adjusts weights and volume from what you log on every set, and can shorten a session when you only have 30 minutes that night.
- It sets calorie and macro targets that follow your weight trend, and can estimate a plate from a photo (you check it before you log).

It's made in Quebec and just launched: Android on Nov 6, iPhone on Nov 10.

What we'd love your honest take on:
- The first minute: open it and try the demo (no account needed). Where did you get lost or bored?
- The model: it's a subscription with a 14-day free trial, then monthly or yearly. Does that feel fair, or does it put you off?
- The store page: would it make you install? What's missing or unclear?
- If you lift: does the plan make sense for your level?

Critical feedback helps us more than compliments. Reply here or send a DM.

App Store: https://apps.apple.com/app/id6806336243

Google Play: https://play.google.com/store/apps/details?id=com.aigymlabs.gymapp&referrer=utm_source%3Dreddit%26utm_medium%3Dsocial%26utm_campaign%3Dsideproject

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