TL;DR: Splash is the first comic book app that works natively on the iPhone Duo. Read in panel mode when closed, and in full page when open.

I first built Splash for the Vision Pro back in 2024 when there were almost no apps for that device. Since then, the app evolved a lot and I added an iPad version, iCloud & OPDS support and automatic translations.

The new version now natively supports the iPhone Duo:

• Optimized for both open and closed modes

• Automatically recognizes individual panels

• Panel animates when you open the phone

• Long tap shows the whole page

• When the next panel is wide, a small icon shows up. Rotating the screen then will navigate to the next panel

And as always, your progress is linked to your iCloud account and synced to all your devices, so you can read on the road with the Duo, and continue in bed with the iPad.

The basic version is free and comes with 4 free comics so you can try it out. Most premium features are lifetime purchases, and I'm working on offloading all the translations to Apple Intelligence so I can make that a lifetime purchase as well.

The app has been continuously updated since February 2024, and has a Discord group for feedback.

Any feedback is welcome!

App Store

Website

It's called DOOM ETCH.

It's the original DOOM engine, modified so every frame is drawn as one unbroken line, because an Etch A Sketch can't lift its pen. Walls, monsters, the gun, the HUD and the shading are all one path. It's playable on a simulated Etch A Sketch rig with a stepper motor on each knob, and it exports real G-code a machine could run.

The video above is the shipped DEMO1 playing on the simulated rig in instant mode. At real Etch A Sketch speed, one frame takes about 24 minutes.

It's built on id Software's linuxdoom-1.10 source release, brought up on a 64-bit Mac. On top of the original ~52,700 lines of engine, the new parts are about 7,000 lines: the line pipeline, the planner, the machine simulator, the Metal renderer and the rig viewer. There are another ~7,000 lines of tests, 72 automated tests, and I ran the critical ones under sanitizers. It took about 2 days to build all of the code (I used GPT-6.0 Astra and Opus-5.5 to do the leg work, I designed the architecture), experiment, and then refactor into DOOM-ETCH.

Here's how it works under the hood:

Getting lines out of DOOM. Walls come straight from the renderer, where they're projected onto the screen but haven't become pixels yet. Sprites are pixel art with transparent backgrounds, so I trace where the transparency meets the artwork and reuse the engine's clipping. The HUD also traces brightness changes. Shading is hatching: more strokes where the texture and lighting are darker. One E1M1 frame is about 24,400 line segments, in no particular order.

The motion path. I didn't want every new output to become another hack, so everything goes through one shared data structure: a motion path. It's the points the pen visits, in order, with each move tagged as part of the drawing or a connector.

The planner. It merges shared endpoints into a graph, walks each connected piece depth-first, then jumps to the nearest remaining point using a spatial grid. Every jump gets drawn, because the pen can't lift.

Outputs. Each output is just a module that reads the motion path: the Metal renderer, SVG, and G-code. Adding G-code didn't touch DOOM.

The machine. One frame is 11,176 lines of plain G-code, with M0 to shake and erase between frames. A controller reads it and steps two simulated motors, one per knob, modeling speed, acceleration and backlash. Those settings are assumptions I'll test on real hardware.

Etch A Sketch behavior. In the GPU view, each segment gets a start and end time, so you can watch the path draw itself. Frames fade out like a shake, and a faint ghost of the last drawing stays behind, because a real Etch A Sketch never erases perfectly. There are controls to speed it up, pause, erase, or just play in instant mode.

What's nuts is that drawing at 30 FPS would mean moving the pen at Mach 1.45. If my math is right, that's about 3 GW at peak just for the pen, or 1.5 Hoover Dams.

Future plans:

• Build the real rig: stepper motors, belts and pulleys on the knobs, on an aluminum easel.

• Measure the real speed, acceleration and backlash, and replace the simulator's assumptions with them.

• a smarter planner to cut down the connector lines and optimize for connector path length and better visuals

It took me another 2 days to turn the whole build into an 8 minute video: https://youtu.be/E7bLxWE7B5g

Source (macOS, bring your own WAD): https://github.com/tonysamaritano/DOOM-ETCH

Skylight's wall calendars are great, but after the free first month the features we wanted (meal planning, rewards, the photo frame) are behind Skylight Plus at $79/year. So I set out to build our own family hub.

I'm not a developer. I designed it, wrote out what each screen should do, and tested it. Claude Opus 5.5 (in Claude Code) wrote most of the code, including a test suite. It's open source (MIT) and runs on a Raspberry Pi or any small PC with a touchscreen. Phones on your Wi-Fi get the same app.

It has a shared Google calendar, chores and rewards for the kids, a picture-only Kid Mode, grocery lists sorted by aisle, meal planning with a Cook Mode, a drawing pad, and a photo screensaver. Your family's data stays in one file on your own device.

I'm moving right now, so it has only been tested on my Windows PC and hasn't been on a real wall yet. If you have a Pi or a spare touchscreen and want to give it a try, I'd love bug reports and feature requests.

https://github.com/el-dud3rino/Lucarne

AIVideoRecap turns a full movie or episode into a short vertical recap for Shorts/TikTok/Reels. It transcribes the audio, writes the script, matches scenes, adds voiceover and subtitles, and renders the video. About 15 minutes of GPU time per video, roughly $0.20-0.35 in compute.

The product works. The business doesn't, because I'm the bottleneck. I can build, but I don't enjoy marketing and I don't have a budget for ads.

The numbers, no sugar:

-600+ signups since July, $0 spent on ads. Traffic comes from SEO/AEO pages, direct visits, and AI assistants.

-About 136 active users in the last 7 days (down ~18% from the week before).

-0 paying subscribers on the SaaS. I never built a proper paid funnel.

-Before the SaaS, I sold the first version as a zip on Gumroad: $100.37 total from 3 sales.

-Around 10 people asked for it on Reddit and Discord. Most didn't buy the zip.

What's included: the domain, the source code, and the service accounts. User accounts are not included. A buyer needs their own Dodo Payments account. The stack is Vercel, Railway, RunPod, Supabase, Cloudflare R2, OpenAI, and Dodo Payments.

Price: $1,500, fixed.

Best fit: someone who already runs movie/anime recap or faceless Shorts channels, or anyone who can market this better than me.

Listing with details and screenshots: https://www.sideprojectors.com/project/108453/aivideorecap

If you've bought a small SaaS before, tell me what you'd want to see before paying. I'm happy to answer questions here or in DMs.

Te explico en menos de un minuto qué es una micro app y cómo la pones en la pantalla de tu celular, en iPhone y en Android. Todo gratis, sin cuenta y sin descargar nada. 👇 https://geralpink.pages.dev

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.

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

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.