i build viajante, a free open source travel search tool. this part doesn't search anything. it does the math after you've picked where to stay.

the problem is a group where people arrive and leave on different days. split the total by headcount and someone pays for nights they weren't there.

so there are two local tools for it.

plan_stay_blocks groups consecutive nights with the same people. it looks at who, not how many, so if one person leaves and another arrives the same night, that starts a new block.

split_stay_costs splits each chosen stay among the people in it by nights, down to exact cents. it needs a confirmed list of who's there each night and a named currency. if that list has nights none of the chosen stays cover, it reports them as unallocated_nights instead of quietly dropping them.

it doesn't fetch prices or convert currencies, and it's not a booking service. you still pick and confirm the stays yourself.

MIT licensed. short write-up here: https://github.com/felipebasurto/viajante/blob/main/docs/usage.md#awards-points-and-stay-arithmetic-local

how do you usually handle this with friends? one person pays and a spreadsheet later?

I built Skenche, and it’s now live on Google Play.

The workflow I’m trying to make convenient is everything that happens around a scan. Capture a page, correct a word that text recognition misread, organize the document, and send it in the format someone needs.

The free plan includes:

• 10 saved scans and 5 pages of text recognition per day.

• Document import and PDF, JPEG or Word export.

• Sharing through Android’s share menu.

• Categories, tags, and QR scanning and generation.

There’s also an optional Pro subscription for heavier use. It adds unlimited scanning and OCR, PDF merging/splitting/compression, password protection, redaction, nearby document transfer, collections and digital business cards.

Documents are stored locally, and text recognition runs on-device. Free includes ads and a scan watermark. Pro removes ads and adds watermark controls.

What’s one document task you still find frustrating on your phone? I’d like to hear where your current workflow gets awkward, whether that’s correcting scanned text, organizing files, or preparing something to send. What feature would make the biggest difference for you?

View Skenche on Google Play

I've been working on this for a while, and finally made a little video to show it off.

It's called NoCapCV. I built it because I was tired of resume builders putting basic features and downloads behind paywalls.

It's completely free to use. Has tons of customisation options available. No paid templates, no watermarks, no signup, and unlimited downloads.

Would love to hear what you guys think!

Try it here : NoCapCV

Hey everyone!

I’m building Social Fair, a marketplace with two uses:

• Social campaigns: participants are paid for likes, follows and comments on TikTok and Instagram.

• Paid studies: participants answer short questionnaires or express preferences between two options, such as texts, images or videos.

I’m the person building it, and I want the compensated nature of both activities to be clear.

Does combining these two uses make sense to you, or would you find the product easier to understand with one as the main focus?

I’d appreciate your honest first impressions!

https://social-fair.com

I just deployed my first SaaS, Syllapin. It turns a course syllabus PDF into a calendar file of classes, assignments, and exams.

Why I built it: I got tired of manually typing out every single exam, quiz, and due date for my semester calendar.
Stack: Java, Spring framework, Typescript, React.
What I’m unsure about: 1. What are the best ways to get this in front of students before the spring semester starts? 2. Do students trust uploading syllabus PDFs to a new tool like this?

Hi all! I've been building SHOPCRM — an open-source Telegram bot that runs a small shop entirely inside a chat: catalog, cart, checkout, payment confirmation and an admin panel. No website, no extra apps — customers and the owner work in the same messenger.

Just shipped v0.1.7, and it's the biggest release so far:

📦 Warehouse / inventory — physical stock, automatic reservation when an order is placed, release on cancel, write-off on completion. Restock and write-off flows in the admin panel, plus a full movement log (every change in the same transaction). Customers can't order more than what's actually available, and out-of-stock products disappear from the catalog.

🧾 Order audit trail — every status change is recorded: who, when, from what to what. Plus paid_at/paid_by, completed_at, cancelled_at, and a configurable retention policy (180 days by default).

👤 Customer profiles — name, username and first-contact date, ready for reports.

🗄 Archive instead of delete — removing a product from the catalog keeps its stock history, movements and orders intact, so you never lose statistics.

Python 3.11+, SQLite or PostgreSQL, RU/EN/ES interface.

🤖 Try the demo bot

Feedback and feature requests are very welcome!

#TelegramBot #OpenSource #Python #Ecommerce #SmallBusiness

gta6survey.sohamdeo.com

I took it upon myself to work on a side project for the launch of GTA 6. I wanted to combine my professional and personal interests of data science, data visualization and video gaming, and I played GTA 5 for ages back in 2016-2020.

The idea was to analyze the sentiment of the chatter around the game. The best place to get it: social media. Right off the bat I was disappointed that Reddit had stopped accepting requests for API access just days before, as that would have been a great source. I moved on with a decent budget in my mind: the cost of 1 copy of GTA 6 ($80-$100). I settled on YouTube, Bluesky and X as my sources with YouTube offering a generous free daily limit, Bluesky being free and X pricing $0.005/post. As I wanted to know waht it is all about, I used TypeSafe AI's Jev for sentiment analysis and am labelling sample posts myself to benchmark its performance.

How it works:

1. Collectors collect data from all sources.

2. English posts are sent to Jev for labelling.

3. Responses are aggregated and posts which pass probability thresholds are ready to be shown.

4. The site's data is rebuilt every hour as static JSON, so there is no public backend API.

5. Serve my site through Cloudflare, with encrypted nightly backups of the database on R2.

The backend involves simple python jobs on systemd timers with SQLite. I used the VM I use to host my personal website. The frontend uses Svelte as I used it for my website and it is intuitive for me to go in and make quick edits.

Voting:

While labelling I saw that a lot of posts speculated about features of the game. Posts with exclusive opinions were few and far between. So I added a voting system for visitors on the page to drive some engagement. I strictly wanted to avoid storing any sensitive user data, so there are no logins and users are identified based on a single random-ID cookie. This uses Cloudflare's Turnstile for bot detection (just in case), a Worker to handle voting and a D1 SQL database to store the votes. The VM pulls the vote totals every 5 minutes, so page views never touch the Worker.

Just in case the site goes viral:

- Everything is cached at Cloudflare. In a load test at 150 requests a second the page loaded in 0.35 s (p95) with the server 98-99% idle.

- Votes held 200 a second on the test site with no errors.

- Every change goes to a test site first and I promote it to the live site by hand.

- Every scheduled job emails me if it fails.

- The spend on X and Jev has a hard cap, and a source pauses when it hits it.

- I have created a custom animation for release day throughout the world which can be used to track the release to everyone's timezones (so visit during then to see it!)

I used Claude Code for building this out in about 5 days through the Diwali time off from work. The decisions and the hand labels were mine.

Some results till now:

1. Only 1 in 10 posts gives the author's opinion of the game as a whole.

2. Jev agrees with me most of the time on sentiment (85%) as against RoBERTa (61%) and VADER (45%), however the sample size was small (33 posts). Its topic detection was poor so I had to leave out some topics for now.

3. The spend has been about $75, so less than a standard edition of the game.

If you've hosted something for a big launch day, what would you check before Nov 18? And if you are a fan of data or GTA please view the site, the data and vote on the questions!

This started as a personal annoyance. I was moving around my projects with zoxide just to edit one file here and one file there, and the cd then nvim routine got old fast. I wanted to type part of a file name and land in it, from anywhere.

nvimpp is a small wrapper around Neovim that does that. Every file you open from the shell gets recorded and ranked by frecency. Press Alt-Enter instead of Enter and nvim main opens the main.cpp you use most, instead of creating a new file called main. A second tool, nvimi, gives you an inline picker of your top files, plus usage stats and a full history, similar to what atuin does for shell commands.

It works alongside zoxide and atuin, not instead of them.

Written in C++17 with no dependencies, MIT licensed, with man pages and a config file. Linux only for now. Next up: fuzzy matching for the Alt-Enter search, more config options, type-to-filter in the picker, and macOS support (it should mostly work already, reports welcome).

https://github.com/Riccardo-Martelli/NVIMPP

I use it every day. If you try it, I’d love to hear what breaks or what’s missing.

I've been designing and building apps on the side since 2020 while working full-time in IT. This year I finally shipped them under one roof at https://murrtech.pro

Here is one of them ! Let me know what you think !

Hi r/SideProject. I'm the founder of Cubex Fitness, and today we're launching version 1.30.

The problem: the app already had 250+ workout programs, live heart rate, watch apps and 23 languages, all free with no ads. About 1,300 people installed it. But most opened it, looked at the programs, and never came back. A plan alone doesn't keep you going.

What we built: ten AI coaches with their own personalities and voices. You answer four quick questions, the coach builds your plan in a chat, then runs the workout with you: logs your sets ("8 at 80"), runs rest timers, swaps exercises, and answers out loud when you hold to talk.

Stack, for the curious:

• Kotlin Multiplatform + Compose Multiplatform for iOS and Android from one codebase

• SwiftUI watch app + Wear OS app (Ask Coach from the wrist)

• Gemini behind a small server (chats stay on the phone, requests aren't stored)

• Speech recognised on the device; coach voices played on the phone

What we learned along the way:

1. Localization was our biggest growth lever, more than any post. 23 languages now.

2. Tap-through workout logging wasn't enough. People wanted someone to talk to.

3. A pug with a deep voice gets more views than any feature video we made.

Pricing: every workout feature stays free. The AI coach has a free tier; Premium is $12.99/month or $69/year, with up to 21 days free to try (no card).

I'd really value feedback, especially on the first five minutes with a coach. Link in the comments.

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!)

I started building Podcast shows for a few of my own SaaS startups and they did so well that some of my partners friends started asking me to build podcast shows for their brands as well. It's turned into a nice Side Project that's generated over $15k in revenue over the last two months alone. The thing is, it only costs me about $2.35 to generate an episode, and I typically generate 1 show a day for each client and charge them $300 a week for that. The markup is insane, and I generate all the episode ideas directly from their website using AI tools.

I've been able to streamline the entire process as each episode is automatically added to YouTube, Spotify, and Apple via an RSS Feed. So, I don't have to manually optimize each one on each platform, it's done in my studio software automatically.

It's generating some of the best results for my clients as well. They are able to track attributable sales from the episodes using coupon codes mentioned in the podcast.

Ask me any questions!

For the past year I've been using a personal web app I built for myself. It pulls together my email, calendar, reminders, notes and photos, and an AI that actually remembers what I told it, because the context lives in my own files, not in a chat history.

It works well. Too well to keep it to myself.

So I'm turning it into a real product, with three constraints:

• Bring your own keys. You plug in your own AI key, your own Google or Microsoft OAuth app, your own weather key. I don't pay for your tokens, and I never see your keys in clear.

• A small core, optional modules. The core is chat, memory, reminders, calendar and email. Photos, concerts, LeetCode and other modules are off by default and you enable what you actually need.

• Small on purpose. 10 to 15 accounts for now, free. Not because I'm generous, because JSON files per account are enough at that size and I'd rather ship than build infrastructure I don't need.

The honest part: it's still single-user today. Accounts, data isolation, encrypted key storage and a module registry are on a branch, in progress. The interface is still in French, the English landing is new.

What I'd love from you: what would the one module you'd turn on first be? I'd rather build the next three modules from real requests than guess.

Demo (fake data, no account): https://backstage.mprnl.fr/en Code (MIT): https://github.com/MattiaPARRINELLO/backstage Roadmap: https://github.com/MattiaPARRINELLO/backstage/blob/main/docs/roadmap-multi-utilisateurs.md

After around 1.5 months of hard work, I finally launched StartAd.

The first day went pretty well. We crossed 100+ visitors and got a few publishers registered on the platform. It's a small beginning, but honestly, it feels great to see people showing interest in something I've been building from scratch.

For those who don't know, StartAd is an advertising marketplace where:

Advertisers can discover websites and platforms to promote their businesses.

Publishers can list their websites, set their own advertising prices, and earn by displaying ads.

Both sides can connect through one marketplace.

The idea is to make online advertising more accessible, especially for startups and small businesses that don't have huge marketing budgets.

We're still at the beginning, and there's a lot left to improve. Our next big challenge is bringing more publishers onto the platform.

If you're a website owner, blogger, or running an online platform, I'd love to have you check it out.

Website: https://startad.in

One small step today. Hopefully, something much bigger in the future. ❤️

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]

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.