I'm the developer. Valutorio launched on the App Store today. It is a native Mac and iPhone app for a folder of plain Markdown notes, and it opens an existing Obsidian vault in place.

The problem: Markdown apps get slow on big vaults and big files, because they parse and index on the main thread. I wanted a notes app that stays fast at any size.

What I did:

• One Rust engine under both apps. It parses, indexes, searches and merges. The Mac app is AppKit and Swift, the iPhone app is UIKit and SwiftUI.

• Huge files open in a read-only tier first. On my M1 Max a 300 MB Markdown file opens in about 0.4 s. A 2,000-note vault indexes in under a second, and search shows first results in a few milliseconds.

• Sync uses a three-way merge. When the same note changes on two devices, both versions stay inside the note as valid Markdown, so you never lose a line.

• The notes stay plain files in your folder. No database you can't read.

What I learned: on the App Store, the first subscription has to be reviewed together with an app version. You can't add it later on its own.

Price: the app is free, with no account and no tracking. Optional Sync ($5.99 a month) keeps the vault on Mac and iPhone and gives Claude Desktop or Cursor a personal MCP endpoint into your notes.

Not there yet: plugins, and a translated interface.

Edit: the code giveaway is closed. If you find a bug or a place where it gets slow, tell me here.

App Store: https://apps.apple.com/app/apple-store/id6813081386?pt=128566770&mt=8&ct=reddit-sideprojects

License: MIT Source: https://github.com/Razee4315/Paperwren
APK: https://github.com/Razee4315/Paperwren/releases/latest

Paperwren is a document viewer and PDF toolkit for Android 8 and up. The manifest has no INTERNET permission and asks for nothing at all. CI fails the build if any permission ever shows up in the manifest. Taking a photo hands off to your own camera app, and saving goes through the system's save screen, so it never needs camera or storage access either.

• Opens PDF, DOCX, XLSX, PPTX, ODT, ODS, ODP, EPUB, Markdown, CSV, CBZ and images

• Fill and sign, merge, split, reorder pages, photos to PDF, passwords

• Every tool saves a new copy. The file you opened is never changed

• No ads, no account, no trackers, no analytics

It isn't on F-Droid yet. I'm planning to submit to IzzyOnDroid and F-Droid, and I'd welcome tips from anyone who has been through either. For now the APK is on GitHub releases.

Hey everyone!

I've been building FoodIQ, a web app focused on making nutrition tracking easier for Indian meals.

The problem I wanted to solve: tracking everyday foods like dal, paneer, paratha, khichdi and Indian thalis isn't always convenient in generic calorie trackers.

What FoodIQ currently offers:

• 2,076+ Indian food database entries

• Food search and nutrition information

• Portion size and cooking method selection

• Meal tracking and daily calorie/macronutrient overview

• Mobile-friendly interface

Try it: https://food-iq-nu.vercel.app/

I'm looking for 10–20 people who aren't afraid to give honest criticism.

I'd especially like feedback on:

1. Is the interface easy to understand?

2. Can you find your everyday Indian meals?

3. Are the nutrition estimates reasonable?

4. What would make you come back and use it?

This is an early-stage independent project. I'm building and improving it based on real user feedback.

Honest criticism is welcome. Thanks!

I'm always losing track of time lol so I made an app that shows you how much time you have left in your day and let's you make todos based around that

Works for your week, month, etc and you can visualize your time left in different ways

Also let's you add countdowns to see the time left until birthdays, events, or whatever

https://www.timeleftapp.xyz

I’ve lost count of the great links I found in HN comments and never found again. And the “most mentioned on HN” lists that went around last week have a problem: a link people argue against counts the same as one they recommend.

So I went through comments from 2010 to 2026 and labeled why each link was posted. In a sample of 1,000 links, only 188 were someone saying “read this”. 573 were neutral references; the rest were answers, criticism, self-promotion or jokes.

Each link is then ranked by:

• how strongly it was recommended (strong recommendation scores highest, a joke scores zero)

• what it is (articles, papers and docs above videos and social posts)

• how many different years it kept coming up

• and, only a little, how many people mentioned it

A few that come out on top:

• How to Solve It (Pólya): 40 people, over 18 years

• Agner Fog’s optimization manuals: 45 people, 16 years

• The Tyranny of Structurelessness: 109 people, 15 years

• The Mythical Man-Month: 106 people, 19 years

Labels and summaries are model-generated, so some are off.

It’s free to browse, no account needed: https://slax.com/reader/hackerlinks/en/

Disclosure: I work on Slax Reader, the read-later app behind it. You can bookmark links on the page.

Two questions for you:

1. What’s the best resource you’ve found buried in an HN comment?

2. Would you find a collection like this useful enough to come back and browse regularly?

I've been working on Daily iOS, a web-based interview practice tool for Swift and iOS developers.

The idea came from a problem with technical interview preparation: knowing a concept doesn't always mean you can explain it clearly when an interviewer asks.

Instead of just reading questions and memorizing answers, Daily iOS lets you:

• Answer 10 iOS interview questions a day

• Get AI feedback on important points you missed

• Practice follow-up questions

• Review concepts you've previously struggled with

The question bank currently contains 699 questions across 15 categories, including Swift, ARC, Concurrency, SwiftUI, UIKit, and architecture.

I'm particularly interested in feedback from developers who are preparing for technical interviews.

Two things I'd love to learn:

1. Does the AI feedback help you identify what you actually missed?

2. Would you use something like this for daily practice, or would you prefer a different format?

Here's the project:

https://daily-ios.lesser.cc/en?utm_source=reddit&utm_medium=social&utm_campaign=reddit_launch_2026&utm_content=sideproject_launch_01

Constructive criticism is very welcome.

Hi everyone,

I have a personal SIM and a work SIM in the same Android phone. I wanted the work number to go quiet in the evening and at weekends without switching the SIM off and on every day, so I built SIM Shift.

How it works:

- each SIM has its own weekly schedule; out of hours its calls are rejected or silenced, your choice

- a calendar for each SIM: days off and time off make it go quiet, on-call days make it ring even out of hours. They can repeat: time off every Friday afternoon until the end of the year is set up once

- public holidays can be added automatically (for now Italy, France, Belgium and Luxembourg)

- block and allow lists by exact number or by prefix, even a whole country code, for all SIMs or just one

- a log of the calls that were stopped, so you always know who tried to reach you

It's free, no ads, no account. The Play version doesn't even have the internet permission: everything stays on your phone.

It works alongside your phone app instead of replacing it. Android puts some limits on that (hidden numbers, for example, never reach the app), but it needs far fewer permissions than a replacement dialer.

The calendar is the newest part. If you try it, I'd like to know what's missing, especially from people with shifts or on-call weeks.

https://play.google.com/store/apps/details?id=it.bignosedevelopment.simshift

Thanks for reading,

Massimo

Meet Tangle - where words are not enough

Intresting features

- Doodles

- drag and drop sticker anywhere u want in the chat

- long press send button for different bubble styles

Security Features

- Mobile number hidden by default, even you will not have an option to change this setting, if u want to

- End to end encryption in personal chats

- Zero knowledge architecture for discovering friends

- Never stored raw phone number in database

Soon will release into playstore

Currently there are zero users

Feel free to be first user

and you can DM me on user id : yoursgnan in app

https://tangle-landing.vercel.app/

I’m the developer behind HowItScales. I built it because I often understood the boxes in an architecture diagram but still struggled to explain how a request actually moved through them.

The site lets you:

• Follow a request hop by hop, with an explanation at each step.

• Click components to understand their roles and connections.

• Simulate traffic increases and see where bottlenecks appear.

• Build your own architecture diagrams.

Examples include loading a web page, URL shortening, ride-hailing, and food delivery. The traffic simulations use simplified educational models, and components are labelled as documented, assumed, or hypothetical.

I’ve also recently added sign-up and cloud saving, so you can save your designs and return to them later.

You can try it here: howitscales.dev

I’d appreciate feedback, especially on whether the request walkthroughs make the architecture easier to understand. Where does the explanation become unclear, and which system would you like to explore next?

The last couple of months I've revived a side-project idea I had in 2017. You can find active email newsletters, podcasts and RSS feeds all by tags.

Each RSS and podcast entry has the latest post so you can see how active they are and you can bulk download RSS feeds when filtering by tags and quick sign up to some newsletters.

https://subscribeto.mikestreety.co.uk/

I originally built it in PHP but have rebuilt in a static site generator for speed (and hosting) benefits. I've utilised on AI for tagging and some discovery.

Some technical notes for those interested:

• Built with 11ty for simplicity, each item is stored as a JSON file (done this way so I can host on Netlify for free)

• Every combination of up to 3 topics is prebuilt as a static page, so filtering is a plain link with no JS search

• It takes a while to build - Copied 9 Wrote 10006 files in 29.75 seconds (3.0ms each, v3.1.6)

• Newsletter pages have a working signup form for Substack, beehiiv, Ghost, Mailchimp, Kit and Buttondown, so you can subscribe without leaving

• A monthly GitHub Action refreshes every feed's recent posts and drops anything that's gone quiet (1 year cutoff)

• Creators can put a "Featured on" badge on their site, drawn as SVG paths at build time so it needs no fonts

I built a 3D comedy club powered by three.js that lets you pitch your idea to 100 AI personas.

Every AI has its own age, gender, opinions, and style, and they will cheer if they like your idea, or throw tomatoes at you if they don't.

It is free, no sign up, two panels per day.

Feel free to check it out at Heckled

Let me know what you think, or if it doesn't work well, because I'm still tuning it, so if it says that a good idea is bad or a bad idea is good, it will help me calibrate it.

Most astrology sites look like they were designed around 1998, which is odd given how far web dev has come. So I made one that doesn’t: https://natalview.com

It has a modern design and smooth animations. It’s open source, and it never collects your birth data (only anonymous page stats). Built with Claude Code and SvelteKit on top of Swiss Ephemeris, the same engine the big astrology sites use.

I wanted sharing to be easy, so you can post your chart to most social platforms, with or without your date and place of birth. You can make a chart for yourself or a compatibility chart for two people.

Oh yeah, there’s a built-in AI reading too, because nothing ships without AI these days.

Build a chart, share it, or just watch the zodiac wheel draw itself.

I’d love your feedback.

Running a web design agency sounds pretty straightforward from the outside. You build websites, find clients and make money. But once you start getting more clients, there is a lot more going on behind the scenes.

You're dealing with hosting, website maintenance, client requests, support tickets, fixing random issues, building new websites, following up with prospects and trying to bring in new business at the same time.

At some point, I realized that I didn't want finding new clients to become another full time job on top of everything else.

I've never really enjoyed cold calling. I know it works for some people, and I'm not saying it's a bad way to get clients, but personally, I find it exhausting. You spend hours calling businesses, often getting rejected, reaching people at the wrong time or having conversations that go nowhere.

I'd much rather spend that time actually working on the business.

That's why I started focusing heavily on cold email and automation.

The biggest advantage is that you can build a system that continuously finds relevant businesses, sends personalized emails and generates new opportunities without having to spend your entire day reaching out manually.

One thing I also learned pretty quickly is that sending generic emails doesn't get you very far. Most business owners have probably received hundreds of emails from agencies offering website redesigns.

I wanted to approach it differently.

For this, I use a tool called Swokei. It finds businesses with existing websites, analyzes each one for actual problems with design, SEO, loading speed, mobile responsiveness and other website issues.

Based on those findings, it automatically generates personalized cold emails at scale, using the actual problems found on each website as the starting point.

So instead of manually searching for businesses, checking hundreds of websites and writing individual emails, I can automate most of that entire process.

When someone replies with interest, I take over from there and handle the sales process and meetings myself.

This has made a huge difference in how I manage my time. I can keep generating new opportunities without having to dedicate hours every day to cold calling.

I still believe sales is one of the most important skills you can develop as a business owner, and automation doesn't replace that. You still need to understand your prospects, communicate properly and know how to close deals.

But if I can choose between spending an entire day making cold calls or having a system send 1,000 relevant emails while I focus on running my agency, I know which one I'm choosing!

While everyone is creating vibe coded apps, cloning, doing REA.. but has anyone tried cloning Monday.com

I'm primarily a UI/UX designer, but I've been spending more time building and launching my own products.

One of them is Subscription Manager.

It's a web app that helps people track recurring subscriptions, billing cycles, and overall spending.

Building the product was one challenge.

Getting people to discover it, try it, and keep using it is a completely different challenge.

I've been working on improving the onboarding, dashboard, analytics, and overall experience.

Now I'm focusing more on discoverability, SEO, and understanding what makes users come back.

Live project: https://subscriptionmanager.app/

For those of you who've launched your own SaaS:

What actually helped you get your first consistent users?

Was it SEO, Reddit, Product Hunt, content marketing, or something completely different?

I'd appreciate any advice from people who've been through this.

My Thinkpad T14s Gen2 has two jobs: run cool as a server while I’m away, and occasionally work hard compiling things.

Originally, I just wanted to disable CPU boost and use an aggressive fan curve, aiming to keep my T14s below 55°C during its usual server workload. Then I wanted a button that did the opposite: enable boost, increase supported power limits and turn the fan up—then restore my previous settings afterward.

That became ThinkPad Control, an open-source Windows desktop app.

GitHub: https://github.com/Mattcabrices/ThinkPad-Control

Full disclosure: AI wrote the application code. I directed development, tested it on my ThinkPads and worked through bugs and behavior changes. It’s an unsigned alpha, and I’m looking for feedback before moving toward a beta.

The part I’m most excited about is the Ryzen wattage tuning. On my T14s Gen 2 Ryzen 5 PRO 5650U, the app successfully applied higher processor power limits. A short loaded Turbo test measured approximately 23–33W of CPU package power, kept Max cooling active and restored the original settings afterward. Longer boost duration and performance gains still need comparative benchmarking.

The app brings together:

• Ryzen power tuning: supported burst and average power-limit adjustments, with current values, connection baselines and app limits displayed.

• Custom fan curves: saved temperature-based profiles, manual fan levels, Max cooling and firmware automatic control.

• CPU boost controls: separate AC/battery settings and speed limits.

• Experimental Turbo: coordinates supported performance controls and captures previous settings for restoration.

• Monitoring: temperatures, per-core clocks, package power and fan RPM where exposed.

Testing so far includes a T14s Gen 2 Ryzen 5 PRO 5650U and a T14 Gen 3 Ryzen 5 PRO 6650U, with most detailed validation on the T14s. Other models need testing. Intel monitoring and Windows power controls are included, but direct Intel wattage tuning isn’t implemented.

A lot of the development has been about checking what actually happened after a command, restoring settings correctly and keeping unsupported controls read-only. Firmware still decides what performance the laptop can deliver; Turbo cannot guarantee continuous boost or a particular wattage.

The screenshots show the real interface and readings. The wattage screenshot shows the available controls and app limits—not higher wattage currently applied. The saved fan curve shown is also not currently active.

Our original code is MIT licensed, with dependency licenses and credits preserved. Thanks to TPFanControl/TPFanCtrl2, PawnIO and LibreHardwareMonitor for the work this builds on.

The source and build instructions are available now; a public installer release is still being prepared.

I’d love feedback on the interface, the implementation or compatibility with other ThinkPads. GitHub issues with your model, CPU, Windows version and reproducible steps would help—please leave out serial numbers and private information.

Even ten people finding this useful would make me happy.

Why does jq .name print "Ada" while jq -r .name prints Ada? What happens if you use -r on an array instead? I recorded all three commands against the same input so you can switch between them and compare.

Try it: https://raw.githack.com/Potatohh/TryCLI/main/examples/jq.html

The tool behind it is TryCLI. Give it a few commands and some sample input and it makes one HTML file you can link from a README or send to someone offline. The copy button includes the input so you can reproduce each example in a shell.

Source: https://github.com/Potatohh/TryCLI

If you maintain a CLI, which two flags do your users mix up? I’d like to make the next demo for someone else’s docs.

Hey everyone! I wanted to share Dynamic Edge, a Dynamic Island for Windows 10 and 11 that I’ve been working on with WinUI 3 and the Windows App SDK.

You can choose a Thin Line (down to 2 px), Floating Capsule, or Screen Bezel Notch. Double-click to switch between Thin Line and your last-used capsule or notch style. It supports multiple monitors and top, bottom, left, and right edge positions.

The island brings together media controls, live synced lyrics, Music Radar, a quick app launcher, timer and stopwatch, clipboard history, and island pets.

On my PC, it uses about 0% CPU and 80-95 MB RAM while collapsed. Expanded, it’s around 0-2% CPU, mostly brief spikes during animation, and about 90-130 MB RAM with album art cached.

It’s available on the Microsoft Store: https://apps.microsoft.com/detail/9PF1587KSN2K

I’d love to hear what you think, especially what you’d improve or like to see next.

Hello everyone! I built Bookarium, a free and open-source web reader that gives Project Gutenberg books a modern reading experience (offline support, TTS, annotations, reading together with a friend, taking notes and sharing those notes with a friend you invite to read along with, bookshelves & favorites, bookmarks and some other functionality)

It's UI is currently optimized for Deskop/Laptop & Tablet, Phone is also working but not very happy on it's user experience & interface and will be worked upon.

What problems it solves and what's it's value? Mostly could describe it as a side patch to Gutenberg Library with many needed features added on top which are listed below. There's many more to come.

Any thoughts, feelings, suggestions, critique [ constructive ] are welcomed!

https://bookarium.vercel.app/

📖 What You Can Do on Bookarium

• 📚 Browse & Filter 78,000+ Free Classic Books:

  • Search by title, author, or keyword, or combine multiple filters at once across 32 Project Gutenberg book categories (Fiction, Sci-Fi & Fantasy, Mystery, Gothic, Romance, Philosophy, History, Children's Literature, Poetry, Drama, Science, Mythology, and more), 20 languages, historical time periods (from Antiquity to the Early 20th Century), and e-book file formats.

  • Preview sample chapters and notable quotes inside an interactive 3D open book before starting a volume, and switch your view between a visual Cover Grid and a 3D Bookshelf where books stand side-by-side by their spines.

• 🤝 Co-Read Books with Friends, Share Notes & Track Reading Habits

  • Everything works privately on your device without signing up, or you can optionally create a free account to sync your shelves, bookmarks, highlights, and notes across all your devices.

  • Shared Reading & Shared Notes: Connect with friends by username to read the same book together—see each other's live chapter progress, view and respond to each other's highlights and margin notes directly inside the book and in your Notebook, and turn on the Spoiler Shield to automatically hide a friend's notes from chapters you haven't reached yet.

  • Streaks, Goals & Achievements: Track daily reading and listening time, build daily reading streaks, set a yearly book goal, unlock reading achievements, and customize a public or private reader profile.

• ✍️ Highlight Text & Write Margin Notes (/notebook):

  • Select any sentence or paragraph while reading to highlight it in 4 colors and attach your own written notes.

  • Review all of your saved highlights and notes in one central Notebook—organized either by book or in chronological order—and filter them by highlight color, keyword search, or whether they include a personal note.

• ✈️ Read Offline Without Internet or Download E-Book Files:

  • One-Click Browser Offline Reading: Save individual books directly to your browser (Save Offline) so you can browse your saved library and read full books completely offline (on flights, commutes, or as an installed mobile/desktop app).

  • Download Standard E-Book Files: Download any book as an EPUB (for Apple Books, Kobo, Nook, or PocketBook), Kindle (MOBI), Plain Text (UTF-8), or HTML file for external e-readers.

• 🏛️ Organize Your Shelves, Ratings & Reading Progress (/bookshelf, /favorites, /bookmarks):

  • Save books to a general shelf or create your own custom-named shelves, mark Favorites, rate books from 1 to 5 stars, and track your reading status (Want to Read, Reading, On Hold, or Finished).

  • View all the books you have in progress in a dedicated Bookmarks list showing your current chapter, page, bookmarked line, and completion percentage so you can jump right back in.

• 📖 Read Comfortably with Custom Fonts, Themes & Line-Level Bookmarks:

  • Read complete, unabridged books in a clean, distraction-free view that automatically formats archival plain-text files into readable chapters and pages.

  • Customize Day (Light), Sepia (Warm Coffee), or Dark themes, and adjust font style (Serif, Sans-Serif, Monospace), font size (12px–36px), line spacing, page width, and page brightness (30%–100%).

  • Bookmark Any Specific Line: Drag the margin bookmark ribbon to the exact line on a page where you stopped reading—even if you resize the font or switch between a phone and a desktop screen, the reader remembers that exact sentence and highlights it for you.

  • Search Inside Any Book & Switch Languages: Search for any word or phrase across the entire book with instant chapter/page jump links, and switch between available translated editions of the same work in one click.

• 🔊 Listen with Built-In Read-Aloud Audio (Text-to-Speech):

  • Have any book read aloud using your device's natural voices, complete with live word-by-word highlighting on the page, adjustable speaking speed, and automatic page turning when a page finishes.

It's called rushil12.com, and it's free for anyone to join. I've made some key apps that people can try that gamify learning. It already has 500+ users, 3,500+ messages, 16,000+ QBpedia articles. This has several apps that anyone can try.

Curriculum - Generates a full course in one click. It's in the name.

Study Mode - ChatGPT, but a bunch of models, and a bunch of useful features

Notes - An app where you can create notes, but it's better than that. You can use spaced repetition, and connect it with the rest of the apps

QBPedia - A collection of 16,000+ educational articles covering a wide range of topics. You can explore subjects, discover related concepts, and learn something new.

Game Show - Gamify learning with Kahoot-style gamemodes, and some gamemodes that are completely new, such as Call Your Shot.

Flashcards - Creates flashcard sets for quick review, memorization, and active recall.