Show HN Daily Selection (2025-04-10)
- Aqua Voice 2 – Fast Voice Input for Mac and Windows
- Obelisk – a WASM-based deterministic workflow engine
- I built an app to generate story relationships using Mermaidjs
- LLM Based Spark Profiler
- Git Game Show – Multiplayer Game in Your Repo
- Comparing product rankings by OpenAI, Anthropic, and Perplexity
- Fermi – A Wordle-style game for order-of-magnitude thinking
- DrawDB – open-source online database diagram editor (a retro)
- Signum – Kotlin Multiplatform Cryptography and PKI Library
- I built a Yahoo Messenger-inspired web chat app – pure nostalgia
- Dynomate– Fast, Git-Friendly DynamoDB GUI Client (Dynobase Alternative)
- Webtor – open-source torrent streaming engine
- Repo Roast – a real-time feed of the funniest comments on GitHub
- I built a tool that deconstructs websites to reveal their tech stack
- eInk Manga with Kindle Comic Converter (+Kobo/ReMarkable)
- I built a word game. My Physics teacher likes it. What about you?
- AI-Driven Index Tuning With Postgres MCP Server
- Speech and Audio To Text – Transcribe voice messages offline
- My mom was unimpressed with my blog. What do you think?
- The most advanced transparently functioning computer
- Chrondb – a PostgreSQL-compatible Git-backed database [video]
- Cross-platform AirDrop, now with Bluetooth [video]
Aqua Voice 2 – Fast Voice Input for Mac and Windows [Audio]
73 points, 33 comments
Aqua Voice 2 is a fast AI dictation tool for Mac and Windows that enables voice input across desktop applications.
- Works in any text field (Cursor, Gmail, Slack, terminal, etc.)
- Launches in under 50ms with text insertion in ~1 second (as fast as 450ms)
- High accuracy with state-of-the-art speech recognition
- Designed for speed and usability, rebuilt from scratch
- Targets making voice a first-class input method
Discussion Link, Original Link
Obelisk – a WASM-based deterministic workflow engine [Developer Tools]
54 points, 13 comments
A lightweight WASM-based workflow engine for durable and deterministic execution built with Rust and wasmtime.
- Built with Rust, wasmtime, and WASM Component Model
- Enables reliable, long-running workflows
- Supports automatic resume after failures
- Designed for deterministic execution
- Seeks feedback on approach and use cases
Discussion Link, Original Link
I built an app to generate story relationships using Mermaidjs [Design]
101 points, 29 comments
Generates story relationships using Mermaidjs.
- Visualizes story connections
- Uses Mermaidjs for diagrams
- Simple and interactive
Discussion Link, Original Link
LLM Based Spark Profiler [Developer Tools]
16 points, 2 comments
A lightweight tool that parses Spark event logs to provide optimization insights for data jobs.
- Automatically analyzes large Spark event logs (100s of MBs)
- Offers real-time configuration recommendations
- Identifies data skew and bottlenecks
- Provides performance vs. cost balancing insights
- Includes a demo video for quick walkthrough
Discussion Link, Original Link
Git Game Show – Multiplayer Game in Your Repo [Entertainment]
25 points, 1 comments
Multiplayer game played within a Git repository.
- Playable directly in a Git repository
- Multiplayer functionality
- Interactive and engaging format
Discussion Link, Original Link
Comparing product rankings by OpenAI, Anthropic, and Perplexity [Research]
65 points, 18 comments
AI Product Rank compares product rankings from OpenAI, Anthropic, and Perplexity with citations.
- Compares rankings across multiple AI models
- Provides citations for each ranking
- Analyzes sources used by AI models
- Helps understand AI-driven product recommendations
- Tracks unusual or niche citation sources
Discussion Link, Original Link
Fermi – A Wordle-style game for order-of-magnitude thinking [Entertainment]
49 points, 26 comments
A Wordle-style game for practicing order-of-magnitude estimation through logical reasoning.
- Uses sliders and fixed quantities (e.g., weeks per year) to build rough estimates
- Goal is to get within an order of magnitude of the true answer
- Simple math with a focus on logical thinking
- Inspired by Fermi estimation techniques and the Fermi paradox
Discussion Link, Original Link
DrawDB – open-source online database diagram editor (a retro) [Developer Tools]
232 points, 49 comments
DrawDB is an open-source online database diagram editor that has grown significantly with community support.
- Open-source and free for everyone
- Supports 37 languages
- Gained 26k GitHub stars and a 1000+ member Discord community
- Created by a solo developer seeking direction for monetization or expansion
Discussion Link, Original Link
Signum – Kotlin Multiplatform Cryptography and PKI Library [Developer Tools]
4 points, 0 comments
Signum is a Kotlin Multiplatform cryptography and PKI library with hardware-backed security and biometric authentication support.
- Open-source Kotlin Multiplatform (KMP) library
- Comprehensive ASN.1 engine
- Supports Android and iOS with hardware-backed crypto and key storage
- Native biometric authentication integration
Discussion Link, Original Link
I built a Yahoo Messenger-inspired web chat app – pure nostalgia [ChatBots]
55 points, 22 comments
A nostalgic web chat app inspired by Yahoo! Messenger with group chat rooms and customizable features.
- Group chat rooms with simple setup (no email required)
- Room customization (backgrounds, cursors)
- Message formatting with basic markdown (bold, italics, colored text)
- Classic Yahoo! Messenger emoticons
- Planned features: audibles, buddy lists, private chats
Discussion Link, Original Link
Dynomate– Fast, Git-Friendly DynamoDB GUI Client (Dynobase Alternative) [Developer Tools]
21 points, 7 comments
Dynomate is a fast, Git-friendly DynamoDB GUI client designed as an alternative to Dynobase.
- Request collections for chaining operations across tables, accounts, and sessions
- Environment variables for seamless switching between dev/staging/prod
- Multi-tab, multi-account support for simultaneous work
- Easy SSO login directly from the GUI
- Git sync with TOML file storage for version control and privacy
Discussion Link, Original Link
Webtor – open-source torrent streaming engine [Consumer Tech]
24 points, 7 comments
Webtor is an open-source engine for streaming torrents and magnet links directly in the browser.
- No swarm exposure — all torrent traffic runs server-side
- In-browser playback via HLS
- Progressive download with resume support
- Lightweight JS SDK and public API
- Fully self-hostable via Docker
Discussion Link, Original Link
Repo Roast – a real-time feed of the funniest comments on GitHub [Entertainment]
7 points, 0 comments
A real-time feed of the funniest GitHub comments, powered by LLM humor detection.
- Uses GPT-4o-mini for initial filtering and GPT-4o for humor scoring
- Processes the last 90 days of historical comments and updates hourly
- Surfaces the human, silly side of developers
- Can be used as a leaderboard, hiring tool, or distraction
- Initially surfaced more NSFW content despite OpenAI's censoring
Discussion Link, Original Link
I built a tool that deconstructs websites to reveal their tech stack [Developer Tools]
15 points, 0 comments
A tool that analyzes websites in real-time to reveal their tech stack, focusing on modern frameworks and tools.
- Uses Playwright to load and examine website code dynamically
- Detects cutting-edge technologies like Next.js, Vite, and React Compiler
- Queue-based architecture for handling concurrent requests
- Dual-layer caching system for performance and result sharing
- Open-source and free with no usage limits or premium tiers
Discussion Link, Original Link
eInk Manga with Kindle Comic Converter (+Kobo/ReMarkable) [Consumer Tech]
3 points, 1 comments
eInk Manga conversion tool for Kindle, Kobo, and ReMarkable devices.
- Converts manga for eInk displays
- Supports Kindle, Kobo, and ReMarkable
- Optimized for comic/manga reading
Discussion Link, Original Link
I built a word game. My Physics teacher likes it. What about you? [Entertainment]
11 points, 3 comments
A word game enjoyed by a physics teacher.
- Simple and engaging word game
- Positive feedback from a physics teacher
- Designed for broad appeal
Discussion Link, Original Link
AI-Driven Index Tuning With Postgres MCP Server [Developer Tools]
9 points, 4 comments
AI-driven Postgres MCP server for database tuning and optimization.
- Industrial-strength tuning algorithms similar to MS SQL Server
- "What if?" tool to evaluate LLM-generated index suggestions
- Integrates with Cursor for ORM code changes
- Safe SQL execution with restricted mode
- Health checks to prevent production issues
Discussion Link, Original Link
Speech and Audio To Text – Transcribe voice messages offline [Audio]
6 points, 0 comments
An offline iOS app for transcribing voice messages from WhatsApp, Telegram, and Voice Memos without sending data to the cloud.
- Works fully offline with no internet required
- No data sent to external servers
- One-time purchase, no subscription
- Direct support for WhatsApp and Telegram voice messages
- Supports over 60 languages using on-device iOS speech recognition
Discussion Link, Original Link
My mom was unimpressed with my blog. What do you think? [Text]
6 points, 2 comments
A personal tech blog seeking honest feedback to impress the author's mom.
- Features personal tech articles and projects
- Includes GitHub repository link for transparency
- Humorous motivation to drive engagement ("impress mom")
Discussion Link, Original Link
The most advanced transparently functioning computer [Consumer Tech]
3 points, 0 comments
Most advanced transparently functioning computer.
- Advanced functionality
- Transparent operation
Discussion Link, Original Link
Chrondb – a PostgreSQL-compatible Git-backed database [video] [Developer Tools]
9 points, 0 comments
A PostgreSQL-compatible database that persists records directly into a Git repository.
- Supports PostgreSQL wire protocol (psql)
- Stores and versions data changes in Git in real time
- Ideal for immutable infrastructure and auditable data
- Combines relational model with Git version control
- Useful for backend development, DevOps, and data engineering
Discussion Link, Original Link
Cross-platform AirDrop, now with Bluetooth [video] [Consumer Tech]
4 points, 0 comments
Cross-platform AirDrop alternative with Bluetooth support.
- Cross-platform compatibility
- Bluetooth file transfer
- No additional setup required