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Show HN: Samchika – A Java Library for Fast, Multithreaded File Processing

Hi HN, I built a Java library called SmartFileProcessor to make high-performance, multi-threaded file processing simpler and more maintainable.<p>Most Java file processing solutions either involve a lot of boilerplate or don’t handle concurrency, backpressure, or metrics well out of the box. I needed something fast, clean, and production-friendly — so I built this.<p>Key features:<p>Multi-threaded line/batch processing using a configurable thread pool<p>Producer/consumer model with built-in backpressure<p>Buffered, asynchronous writing with optional auto-flush<p>Live metrics: memory usage, throughput, thread times, queue stats<p>Simple builder API — minimal setup to get going<p>Output metrics to JSON, CSV, or human-readable format<p>Use cases:<p>Large CSV or log file parsing<p>ETL pre-processing<p>Line-by-line filtering and transformation<p>Batch preparation before ingestion<p>I’d really appreciate your feedback — feature ideas, performance improvements, critiques, or whether this solves a real problem for others. Thanks for checking it out!

Show HN: Genetic Boids Web Simulation

Show HN: Genetic Boids Web Simulation

Show HN: Genetic Boids Web Simulation

Show HN: DoubleMemory – more efficient local-first read-it-later app

DoubleMemory started as an experiment to see if I can somehow automatically save all double cmd + c, as I often do instinctively, so I don't need extensions to save links and text into an app, and avoiding flooding the capture history as regular clipboard managers does.<p>My motivation was not to create a read-it-later app, yet it evolved into this unique yet cohesive form of a read-it-later + bookmarking organizer + clipboard manager + card based note-taking app over the last 6 months. It also launches from the menu bar with a shortcut and navigates with keyboard shortcuts. My favorite part is instead of rendering a list of article titles, everything is rendered as pretty preview cards in a translucent Pinterest-like mood board. It also has a nifty iOS app, that will allow you to swipe with your thumbs between articles just like on iOS Safari...<p>Now that Pocket is closing, this is after Instapaper going back to indie and Omnivore and UpNext and numerous others closing over the years. All of these are cloud-hosted services, which got me reflecting: maybe this local-first architecture would be well positioned to build in this space.<p>Here is my not-so-scientific comparison:<p>## Domain<p>$10 vs $1M = 100,000x difference.<p>## Server running cost<p>No servers other than what's running by iCloud vs $1M per year = 1mX difference<p>## Platforms<p>Apple only (mac + iphone + ipad) vs Multi platforms (windows, linux, android also supported) = 20X maintenance cost difference<p>## Capturing<p>No browser extensions required v.s. maintain all extensions for various browsers and extension stores = 5x difference<p>## Architecture<p>App receives the link, Apple generates the rich preview cards for thousands of different types of links, app caches these preview cards. vs. Someone write some custom code for each link type or with Open Graph, one designer created one generic card that works for all links. = 100x cost difference.<p>I know, Apple is coming for clipboards with more restrictions, which is basically a shared global state on Mac systems, DoubleMemory does also support other ways to capture: drag-n-drop to app/menubar icon/app icon, right click->Services menu, or Share sheet. We will add more auto-importers.<p>Also vibe coded some importers for Pocket, Omnivore and ReadWise here: <a href="https://doublememory.com/posts/tools" rel="nofollow">https://doublememory.com/posts/tools</a><p>Everything in the app is free with no limits. Capturing is really step 0. You giving us a chance to save your content, doesn't mean you are getting any values out of it (ain't that the typical story of read-it-later apps? save-it and never-read-it). the eventual goal is to easily retrieve these content, and eventually consuming them. I hope to eventually launch paid features that aligns with these value generating workflows.<p>App Store link: <a href="https://apps.apple.com/us/app/doublememory/id6737529034">https://apps.apple.com/us/app/doublememory/id6737529034</a><p>Let me know what you think...

Show HN: DoubleMemory – more efficient local-first read-it-later app

DoubleMemory started as an experiment to see if I can somehow automatically save all double cmd + c, as I often do instinctively, so I don't need extensions to save links and text into an app, and avoiding flooding the capture history as regular clipboard managers does.<p>My motivation was not to create a read-it-later app, yet it evolved into this unique yet cohesive form of a read-it-later + bookmarking organizer + clipboard manager + card based note-taking app over the last 6 months. It also launches from the menu bar with a shortcut and navigates with keyboard shortcuts. My favorite part is instead of rendering a list of article titles, everything is rendered as pretty preview cards in a translucent Pinterest-like mood board. It also has a nifty iOS app, that will allow you to swipe with your thumbs between articles just like on iOS Safari...<p>Now that Pocket is closing, this is after Instapaper going back to indie and Omnivore and UpNext and numerous others closing over the years. All of these are cloud-hosted services, which got me reflecting: maybe this local-first architecture would be well positioned to build in this space.<p>Here is my not-so-scientific comparison:<p>## Domain<p>$10 vs $1M = 100,000x difference.<p>## Server running cost<p>No servers other than what's running by iCloud vs $1M per year = 1mX difference<p>## Platforms<p>Apple only (mac + iphone + ipad) vs Multi platforms (windows, linux, android also supported) = 20X maintenance cost difference<p>## Capturing<p>No browser extensions required v.s. maintain all extensions for various browsers and extension stores = 5x difference<p>## Architecture<p>App receives the link, Apple generates the rich preview cards for thousands of different types of links, app caches these preview cards. vs. Someone write some custom code for each link type or with Open Graph, one designer created one generic card that works for all links. = 100x cost difference.<p>I know, Apple is coming for clipboards with more restrictions, which is basically a shared global state on Mac systems, DoubleMemory does also support other ways to capture: drag-n-drop to app/menubar icon/app icon, right click->Services menu, or Share sheet. We will add more auto-importers.<p>Also vibe coded some importers for Pocket, Omnivore and ReadWise here: <a href="https://doublememory.com/posts/tools" rel="nofollow">https://doublememory.com/posts/tools</a><p>Everything in the app is free with no limits. Capturing is really step 0. You giving us a chance to save your content, doesn't mean you are getting any values out of it (ain't that the typical story of read-it-later apps? save-it and never-read-it). the eventual goal is to easily retrieve these content, and eventually consuming them. I hope to eventually launch paid features that aligns with these value generating workflows.<p>App Store link: <a href="https://apps.apple.com/us/app/doublememory/id6737529034">https://apps.apple.com/us/app/doublememory/id6737529034</a><p>Let me know what you think...

Show HN: DoubleMemory – more efficient local-first read-it-later app

DoubleMemory started as an experiment to see if I can somehow automatically save all double cmd + c, as I often do instinctively, so I don't need extensions to save links and text into an app, and avoiding flooding the capture history as regular clipboard managers does.<p>My motivation was not to create a read-it-later app, yet it evolved into this unique yet cohesive form of a read-it-later + bookmarking organizer + clipboard manager + card based note-taking app over the last 6 months. It also launches from the menu bar with a shortcut and navigates with keyboard shortcuts. My favorite part is instead of rendering a list of article titles, everything is rendered as pretty preview cards in a translucent Pinterest-like mood board. It also has a nifty iOS app, that will allow you to swipe with your thumbs between articles just like on iOS Safari...<p>Now that Pocket is closing, this is after Instapaper going back to indie and Omnivore and UpNext and numerous others closing over the years. All of these are cloud-hosted services, which got me reflecting: maybe this local-first architecture would be well positioned to build in this space.<p>Here is my not-so-scientific comparison:<p>## Domain<p>$10 vs $1M = 100,000x difference.<p>## Server running cost<p>No servers other than what's running by iCloud vs $1M per year = 1mX difference<p>## Platforms<p>Apple only (mac + iphone + ipad) vs Multi platforms (windows, linux, android also supported) = 20X maintenance cost difference<p>## Capturing<p>No browser extensions required v.s. maintain all extensions for various browsers and extension stores = 5x difference<p>## Architecture<p>App receives the link, Apple generates the rich preview cards for thousands of different types of links, app caches these preview cards. vs. Someone write some custom code for each link type or with Open Graph, one designer created one generic card that works for all links. = 100x cost difference.<p>I know, Apple is coming for clipboards with more restrictions, which is basically a shared global state on Mac systems, DoubleMemory does also support other ways to capture: drag-n-drop to app/menubar icon/app icon, right click->Services menu, or Share sheet. We will add more auto-importers.<p>Also vibe coded some importers for Pocket, Omnivore and ReadWise here: <a href="https://doublememory.com/posts/tools" rel="nofollow">https://doublememory.com/posts/tools</a><p>Everything in the app is free with no limits. Capturing is really step 0. You giving us a chance to save your content, doesn't mean you are getting any values out of it (ain't that the typical story of read-it-later apps? save-it and never-read-it). the eventual goal is to easily retrieve these content, and eventually consuming them. I hope to eventually launch paid features that aligns with these value generating workflows.<p>App Store link: <a href="https://apps.apple.com/us/app/doublememory/id6737529034">https://apps.apple.com/us/app/doublememory/id6737529034</a><p>Let me know what you think...

Show HN: I built a more productive way to manage AI chats

Show HN: I built a more productive way to manage AI chats

Show HN: I built a more productive way to manage AI chats

Show HN: hcker.news – an ergonomic, timeline-based Hacker News front page

Hi folks,<p>I've built an alternative Hacker News front page. It is inspired by and meant to be a replacement for hckrnews.com.<p>I built this because HN is woefully underfeatured, but most sites that try to improve it seem to assume that the visual design is the problem. hcker.news tries to maintain HN's familiarity while adding useful enhancements.<p>There are three primary views:<p><pre><code> - Timeline View: Browse top stories by votes or comments grouped by day, week, or month (e.g., top 20 per day, top 100 per week). - Aggregate View: See top stories by votes or comments over custom time ranges. - Front Page View: The original HN front page, untouched. </code></pre> Feed Filtering:<p><pre><code> - Kagi Small Web: View only stories from websites that are a part of Kagi's Small Web, which is a curated list of non-commercial blogs - Custom Keyword Filters: Include/exclude keywords (e.g., include "Rust," exclude "DOGE") or set a minimum score threshold. - No HN Algorithm: Timeline and Aggregate Views show stories usually downranked by the HN algo (e.g., flagged posts or those with too many comments). </code></pre> UI:<p><pre><code> - Unread Flags: Quickly spot new stories or ones you haven't seen. - Two Layouts: Classic HN style or a compact story view inspired by hckrnews.com. - Multi-column & High-density Modes: Fit more content on screen. - Themes: Light, Dark, and Manila. </code></pre> I'd love your feedback and suggestions. Cheers!

Show HN: hcker.news – an ergonomic, timeline-based Hacker News front page

Hi folks,<p>I've built an alternative Hacker News front page. It is inspired by and meant to be a replacement for hckrnews.com.<p>I built this because HN is woefully underfeatured, but most sites that try to improve it seem to assume that the visual design is the problem. hcker.news tries to maintain HN's familiarity while adding useful enhancements.<p>There are three primary views:<p><pre><code> - Timeline View: Browse top stories by votes or comments grouped by day, week, or month (e.g., top 20 per day, top 100 per week). - Aggregate View: See top stories by votes or comments over custom time ranges. - Front Page View: The original HN front page, untouched. </code></pre> Feed Filtering:<p><pre><code> - Kagi Small Web: View only stories from websites that are a part of Kagi's Small Web, which is a curated list of non-commercial blogs - Custom Keyword Filters: Include/exclude keywords (e.g., include "Rust," exclude "DOGE") or set a minimum score threshold. - No HN Algorithm: Timeline and Aggregate Views show stories usually downranked by the HN algo (e.g., flagged posts or those with too many comments). </code></pre> UI:<p><pre><code> - Unread Flags: Quickly spot new stories or ones you haven't seen. - Two Layouts: Classic HN style or a compact story view inspired by hckrnews.com. - Multi-column & High-density Modes: Fit more content on screen. - Themes: Light, Dark, and Manila. </code></pre> I'd love your feedback and suggestions. Cheers!

Show HN: DockFlow – Switch between multiple macOS Dock layouts instantly

I built DockFlow after constantly rearranging my macOS Dock when switching between coding, designing, or writing tasks. macOS only supports one Dock layout, and every context switch felt like wasted time and broken focus.<p>DockFlow solves this by letting you save multiple Dock presets and switch between them instantly, all without complex setup or bloat.<p>Key features: - Save and switch between multiple Dock configurations - Assign custom hotkeys to change layouts instantly - Add apps, folders, files, or links to your Dock - Insert visual spacers to group items - Lightweight and macOS-native (no permissions or custom dock) - Supports macOS 13.5 and above - Includes CLI tools and Shortcuts integration<p>*Launch Price:* €4.99 Price increases to €9.99 on June 1<p>No subscriptions. One-time payment for lifetime access.<p>Try it here: <a href="https://dockflow.appitstudio.com/" rel="nofollow">https://dockflow.appitstudio.com/</a> Happy to hear your feedback or questions!<p>Let me know what you think Hope more people will find this app helpful.

Show HN: DockFlow – Switch between multiple macOS Dock layouts instantly

I built DockFlow after constantly rearranging my macOS Dock when switching between coding, designing, or writing tasks. macOS only supports one Dock layout, and every context switch felt like wasted time and broken focus.<p>DockFlow solves this by letting you save multiple Dock presets and switch between them instantly, all without complex setup or bloat.<p>Key features: - Save and switch between multiple Dock configurations - Assign custom hotkeys to change layouts instantly - Add apps, folders, files, or links to your Dock - Insert visual spacers to group items - Lightweight and macOS-native (no permissions or custom dock) - Supports macOS 13.5 and above - Includes CLI tools and Shortcuts integration<p>*Launch Price:* €4.99 Price increases to €9.99 on June 1<p>No subscriptions. One-time payment for lifetime access.<p>Try it here: <a href="https://dockflow.appitstudio.com/" rel="nofollow">https://dockflow.appitstudio.com/</a> Happy to hear your feedback or questions!<p>Let me know what you think Hope more people will find this app helpful.

Show HN: SQLite JavaScript - extend your database with JavaScript

Show HN: SQLite JavaScript - extend your database with JavaScript

Show HN: SQLite JavaScript - extend your database with JavaScript

Show HN: SQLite JavaScript - extend your database with JavaScript

Display any CSV file as a searchable, filterable, pretty HTML table

I combined this with a simple API to update a CSV file using Deno/deno-csv library, allowing an Ansible job to easily update a CSV file via the API with Ansible URI module, and then have that same CSV file viewable/downloadable in a simple and easy/dashboardy way (with CSV-to-html-table). Copilot created the Deno/deno-csv CSV API code and then with a little back and forth I added static website functionality (to serve the CSV table), and I had a /view and a /update route. I'm just a sysadmin but I love piecing together stuff like this. Thanks Derek!

Show HN: Defuddle, an HTML-to-Markdown alternative to Readability

Defuddle is an open-source JS library I built to parse and extract the main content and metadata from web pages. It can also return the content as Markdown.<p>I built Defuddle while working on Obsidian Web Clipper[1] (also MIT-licensed) because Mozilla's Readability[2] appears to be mostly abandoned, and didn't work well for many sites.<p>It's still very much a work in progress, but I thought I'd share it today, in light of the announcement that Mozilla is shutting down Pocket. This library could be helpful to anyone building a read-it-later app.<p>Defuddle is also available as a CLI:<p><a href="https://github.com/kepano/defuddle-cli">https://github.com/kepano/defuddle-cli</a><p>[1] <a href="https://github.com/obsidianmd/obsidian-clipper">https://github.com/obsidianmd/obsidian-clipper</a><p>[2] <a href="https://github.com/mozilla/readability">https://github.com/mozilla/readability</a>