Show HN: CtrlTool – 132 free online tools for developers and everyday tasks https://bit.ly/3UaDSrz

Show HN: CtrlTool – 132 free online tools for developers and everyday tasks Hey HN, I built CtrlTool because I kept needing small tools for random things and didn't want to install something or sign up for another website. It currently has 132 tools for things like JSON, JWT, Base64, URLs, text, hashes, PDFs, SEO, converters, generators, and other everyday stuff. The main thing I tried to focus on is making the tools fast and simple. For tools where it makes sense, everything runs locally in the browser so the data doesn't need to be uploaded to a server. It's still very new, so I'm mostly looking for feedback on the UX, which tools are actually useful, and what you think is missing. https://bit.ly/4gJaKAp Would appreciate any feedback. https://bit.ly/4gJaKAp August 23, 2026 at 02:44AM

Show HN: EchoVault, an app that interviews you and answers as you after death https://bit.ly/45GhFnS

Show HN: EchoVault, an app that interviews you and answers as you after death https://apple.co/45CoBCn August 22, 2026 at 01:14AM

Show HN: OzBrain, a shared brain for knowledge between agents and your team https://bit.ly/3ULYK8E

Show HN: OzBrain, a shared brain for knowledge between agents and your team I think agent-first chat interfaces will be a primary software modality and busy dashboard/UI will go away. I’m not sure who exactly wins it, but I want my knowledge to grow/go with me. A lot of the “knowledge” ie research, analysis, reasoning will be done by agents as the primary user. Our current notes tools & tasks management systems were built for humans… I don’t care what the 17th thing on my bug backlog is. I want to conduct agents that can execute for me and do great work. What I built OzBrain to do: + Create a central place for agent reasoned knowledge to live + Be agnostic about what apps/agents connect to it + Capture everything and track it so I can audit it + Enable teams, collaborators or partners to share brains + Handle conflicts so many agents in the same article doesn’t blow up + Refactor knowledge into more token friendly chunks and map the index well + Close the knowledge loop so new thinking supersedes old thinking across the corpus. Don’t erase, depreciate and link + Keep user data safe and secure ++ Be easy enough to use that you don’t have to have any technical knowledge Some among us will always build their own custom solutions, but there are millions of tech professionals and small business owners that will use agents heavily and need a solution. So I’m trying to build that. Isn’t this like gBrain? Yes, similar. I think it’s like AWS vs Vercel. AWS is very powerful, configurable, and useful if you’re technical and want to invest the time into really fine tuning your system… but if you just want your web deploy/hosting to just work and be easy to deal with you use Vercel. // WHY I MADE IT I’ve been enjoying getting back to my technical roots, as I lost my coding skills more than a decade ago, but with AI I can focus on the system and the product in partnership with agent coding workflows. I recently built a Voice AI for older people. To build it I created an agentic engineering workflow (feel free to rip that up as I’m always looking to improve systems: https://bit.ly/3UsGC3y ) My approach with coding agents is trust but verify, and I’m trying to replace the parts where a human would review with an adversarial or specialized agent who would give a better answer/review. I have workflows that will go high level task to shipped PR running in Claude cloud sessions. I use Claude Code locally and Cursor when I want a tighter loop on doing visual work like UI or layout. And Codex to either load balance usage for TokenThriffting or when I want a different llm to think thru something. It was a pain in the ass passing .md files around and keep track of which version was the most recent, so I built a hosted .md storage right in Supabase and any of my agents already have Supabase access. This let me build a solid, scalable, secure voice AI from my phone at the gym. All my agents have access to our knowledge, can write to it, update and refer to it as we build and improve the product and the systems we use. Out of 75 founder friends I asked about how they manage shared knowledge, 26 built their own custom knowledge systems… Obsidian vaults with 7k files synced through a VPS, markdown repos behind their own MCP servers, cron jobs stitching Supabase to a skills file… each a different Frankenstein they have to maintain. 32 said they felt the pain of moving static files around but didn’t have any solution for it. So I rebuilt my brain better and used it to build it. // HOW YOU CAN HELP Would love to have you try it out. The maintenance loop is still in alpha so not running it on customer data yet. If you built your own brain I’d love to hear how you did it. What criteria was most important for you in its design & function. If you are tired of shuffling .md files around I’d love to have you try out OzBrain and to give feedback, just ask your agent to put it in the shared bugs & features brain! Cheers! Bubs.co https://bit.ly/45HnYY9 August 22, 2026 at 12:09AM

Show HN: Steppewm stacking Wayland window manager https://bit.ly/4qvvzm7

Show HN: Steppewm stacking Wayland window manager a thing I made why? there's just nothing like icewm in the wayland space. there's labwc but it's jank if you simply want the icewm experience with a taskbar and DE-ish experience. plus, there's a converter for icewm themes. and a good taskbar. https://bit.ly/4wIZ8Cq August 21, 2026 at 03:12AM

Show HN: ParqDB – Vector search in the browser from Parquet over HTTP" https://bit.ly/4grZtDm

Show HN: ParqDB – Vector search in the browser from Parquet over HTTP" https://bit.ly/3SqVlLR August 21, 2026 at 01:13AM

Show HN: luoluoAI – OpenAI-compatible and Claude Messages API gateway https://bit.ly/4xeFBe4

Show HN: luoluoAI – OpenAI-compatible and Claude Messages API gateway https://bit.ly/46chqAV August 21, 2026 at 12:27AM

Show HN: Ez – a macOS command runner that flags when a command gets slower https://bit.ly/4xRWN96

Show HN: Ez – a macOS command runner that flags when a command gets slower https://bit.ly/3OgC5hF August 20, 2026 at 12:19PM

Show HN: Linux and iPhone Continuity (iMessage / SMS) https://bit.ly/4wGX6mi

Show HN: Linux and iPhone Continuity (iMessage / SMS) After switching to 100% Linux a couple of years ago there was basically only one thing I missed about macOS and that was what Apple calls "Continuity". It's where you get texts, notifications, clipboard sync, file transfer (to/from) the iPhone from the Mac desktop. Especially that thing where OTP codes via text autofilled into the browser form I was waiting on. It took about 4 months of work: - reverse-engineering Apple/iOS Bluetooth behavior - MAP / OBEX - Bluetooth LE + Wi-Fi working together - iMessage through the iPhone's own cellular/iMessage stack - iOS app, Linux daemon, GTK app, Thunderbird/Firefox extension - no Mac involved But it is now something I'd love to show people. Contributions/bugs/feedback welcome! https://bit.ly/4wFJzvb August 20, 2026 at 05:53AM

Show HN: Mail client optimized for self-hosted email across multiple domains https://bit.ly/4qs7GvS

Show HN: Mail client optimized for self-hosted email across multiple domains As someone with a clean IP range and ADHD, I manage my inbox by splitting across a variety of accounts for a variety of domains. I’ve never really found a client that scratches all my itches, so I spent some time making one and it’s now become my daily driver. It’s optimised to be visually simple and highly configurable for things like colour, folders/subfolders, sorting and tweaking the search query function to better match what you search for often. There’s also some little nice-to-haves like a purpose-built PWA, bulk domain onboarding, MCP and dark mode. It’s fully self-hostable, open source and free of any AI bloat/VC fodder. Not trying to sell anything but rather make something un-shitified and simple to use, would love some feedback if you’ve given it a try! :~) https://bit.ly/4xdIHPw August 20, 2026 at 02:55AM

Show HN: A new way to read books, magnifying in and out https://bit.ly/4quXtyL

Show HN: A new way to read books, magnifying in and out After watching The Odyssey, I thought it would be cool to check out some scenes from the source in detail, but I don't have time to read the whole book. So I came up with a sort of zoom/microscope, that allows to see the whole book at a glance and then zoom in (by pinching) on the part I'm interested in. I can do so down to the actual source text and get the authentic feel the author intended, at the same time I better understand where am I in the text and also the character and places are clickable so I can quickly orient myself on the context. Moreover each character has relationships listed and a map of relationships can be opened from there https://bit.ly/4qthZzF https://bit.ly/4qtw1Bq August 19, 2026 at 11:21PM

Show HN: Draw.city – geography game where you circle the target population [US] https://bit.ly/4gfdV1d

Show HN: Draw.city – geography game where you circle the target population [US] The core idea is, you draw a circle on a satellite view map and it tells you the population inside + more info. The home page is a daily challenge, I've backfilled some "past challenges" so there's more than just the past couple of days to play, and there is also a free-draw mode that tells you population + some census demographic info & points-of-interest data from OpenStreetMap. In most cases, the data comes from taking the census blocks w/ centroids contained in your circle and summing their population. Demographic info is slightly more complex as it's not sourced on blocks, so we allocate population-weighted fractions of a source territory's published census values into the drawn territory. Happy to answer any questions about the data or the technical side. The game/app only covers US areas at the moment, I'd like to add international data in the future! I am re-submitting this as a proper "Show HN", as I left the 'Show HN' text out of the title the last time I submitted https://bit.ly/46dVKUY August 18, 2026 at 11:14PM

Show HN: Roost – top for your Claude Code sessions https://bit.ly/468xG5U

Show HN: Roost – top for your Claude Code sessions https://bit.ly/4qvbhte August 18, 2026 at 11:10PM

Show HN: AI-generated music box version of any song (for baby) https://bit.ly/4g5aX0G

Show HN: AI-generated music box version of any song (for baby) title basically covers it. project #2 from my paternity leave. My partner & I got frustrated with hearing Brahm's Lullaby and Wheels On The Bus repeatedly. I also stand by that babies can enjoy adult music just as easily as they can enjoy "kids music". But most adult music is too dense/complex for babies to understand, so I created this to generate baby-friendly, slowed down versions of songs that we like to play for our baby & sing along with. Uses BS-roformer for stemming out the input audio + spotify Basic Pitch for transposing to midi. Still needs some work, kinda sounds like a drunk little music box version of the original but very fun. https://bit.ly/3Sfk5GE August 18, 2026 at 12:14AM

Show HN: A benchmark for AI agent guardrails that caught my own plugin https://bit.ly/4bTq7U9

Show HN: A benchmark for AI agent guardrails that caught my own plugin https://bit.ly/4x8sueo August 18, 2026 at 12:11AM

Show HN: Classifier and browser extension to detect rule violating HN comments https://bit.ly/4ielCav

Show HN: Classifier and browser extension to detect rule violating HN comments I love HN, but lately I have been sick of reading the same dismissive criticisms over and over again. Along with political arguments that have been litigated to death, people's issues with smooth scrolling on blogs, etc. Many of these comments do not get flagged for whatever reason. So I made a service to automatically classify whether comments violate (a modified form of) the HN guidelines automatically. In addition there's a Chrome extension to collapse these comments (if they violate your score thresholds) so you don't have to read them too. You can also just watch guideline violating comments as they are posted on the home page. Here's more info on how it works: https://bit.ly/4ifpatb https://bit.ly/4zpdGtk August 17, 2026 at 05:04PM

Show HN: Convertix – Fast, 100% in-browser media and QR tools https://bit.ly/4ziCT8R

Show HN: Convertix – Fast, 100% in-browser media and QR tools https://bit.ly/4zkLkR1 August 17, 2026 at 01:32AM

Show HN: A visual ping utility that is pretty https://bit.ly/4g45G9u

Show HN: A visual ping utility that is pretty As a network engineer, I use ICMP every day. The default ping utility is ugly, I used a prettyping instead. But it got some bugs, isn't configurable and need bash. So I made my own. I hope it will help some other IT guy. For reference, prettyping: https://bit.ly/4xDA1Sa https://bit.ly/4zntRXZ August 17, 2026 at 12:50AM

Show HN: PageSieve, a web scraping browser extension https://bit.ly/45rF6B8

Show HN: PageSieve, a web scraping browser extension PageSieve[1] is a browser extension for scraping data from different websites from within your browser. Currently it's Firefox only but I am open to porting it to other browsers if that's something people want. My original motivation for this started with a desire to improve the capabilities of the selectorgadget[2] bookmarklet to support extracting as well as finding selectors. The ideal use case is when some data you need is useful but you don't want to spend the effort of writing a one-off script to extract it especially nowadays when a lot of websites need an entire JavaScript environment to load correctly which complicates scraping. Using this extension means you only need to maintain the selectors for extracting the data and don't need to worry about managing dependencies. As long as the website can be opened in your browser you should be able to scrape data from it using the extension. I have a lot of features planned as well as some rough edges that need smoothing. I use this extension nearly everyday and I hope it can make somebody else's work easier. Take a look and let me know what you think. [1]: https://bit.ly/4g0DlRv [2]: https://bit.ly/4xB0RKA https://bit.ly/4g0DlRv August 16, 2026 at 02:45PM

Show HN: Stratum – Rate books, films, and music to find users with similar taste https://bit.ly/3Ukfxzs

Show HN: Stratum – Rate books, films, and music to find users with similar taste https://bit.ly/4gAb7gx August 15, 2026 at 11:36PM

Show HN: Mic Drop, a real-time multiplayer karaoke game https://bit.ly/4wyyrQH

Show HN: Mic Drop, a real-time multiplayer karaoke game https://bit.ly/4wAkbqG August 16, 2026 at 01:46AM