Show HN Daily Selection (2025-08-09)
- Synchrotron, a real-time DSP engine in pure Python
- Selfhostllm.org – Plan GPU capacity for self-hosting LLMs
- BaaS to build agents as data, not code
- Aegis – A framework for AI-governed software development
- LLM from URL –– A free AI chat completion service directly from URL
- I built a free fast-paced match-3 game I think you'll like
- Wordle" with the first 1000 Digits of Pi
- I completed mobile fax app in 60 hours
- I built a simple tool to automate data into Google Sheets and BigQury
- From Hacking a T480 to the Fastest Open-Hardware 75 Hz E-Ink Display
Synchrotron, a real-time DSP engine in pure Python [Audio]
65 points, 3 comments
Synchrotron is a real-time digital signal processing (DSP) engine built in pure Python, prioritizing modularity and hackability over raw performance.
- Processes nodes (simple Python classes with typed I/O and a
render()method) - Supports programmatic or graphical node linking via web UI, Python, REST, DSL, or standalone TUI
- Enables building synths, FX chains, MIDI instruments, arpeggiators, and sound experimentation
- Experimental project with a focus on extensibility and live coding
- Open-source with plans to improve documentation
Discussion Link, Original Link
Selfhostllm.org – Plan GPU capacity for self-hosting LLMs [Developer Tools]
4 points, 1 comments
A simple calculator for estimating GPU capacity for self-hosting LLMs with shareable results.
- Estimates concurrent request capacity for a given LLM
- Provides shareable results
- Helps plan GPU requirements for self-hosting
Discussion Link, Original Link
BaaS to build agents as data, not code [Developer Tools]
3 points, 0 comments
Julep is a backend-as-a-service for building agents and workflows as data instead of code, enabling rapid iteration and scalability.
- Experimentation Velocity: Agents and tasks are declared as data, allowing updates via API calls without code deployment.
- Scalability: Handles 100s of thousands of parallel executions by solving distributed, stateful scaling at the orchestrator level.
- User Personalization: Agents can dynamically update their instructions (e.g., tone preferences) during interactions via built-in tools.
- Workflow Definition: Supports YAML-based workflow declarations for automatic scaling to millions of users.
Discussion Link, Original Link
Aegis – A framework for AI-governed software development [Developer Tools]
3 points, 0 comments
A framework for governing AI-assisted software development to ensure code quality and compliance.
- Enforces versioning, validation, and observability for AI-generated code
- Uses blueprint-based development, drift detection, and runtime compliance
- Designed for teams using AI tools like Copilot, Kilo, or Lovable
- Focuses on AI-native engineering workflows rather than just a library
Discussion Link, Original Link
LLM from URL –– A free AI chat completion service directly from URL [ChatBots]
4 points, 2 comments
A free AI chat completion service accessible directly via URL with whitespace support.
- Accessible by typing questions in the browser address bar after the URL
- Supports whitespace in URLs for natural language queries
- Compatible with curl and Wget by replacing spaces with '+'
- No chat history maintained
- Fair use policy with IP bans for abuse
- Contact available for feedback or issues via email
Discussion Link, Original Link
I built a free fast-paced match-3 game I think you'll like [Entertainment]
3 points, 1 comments
Fast-paced free match-3 game designed for quick enjoyment.
- Free to play
- Fast-paced gameplay
- Match-3 mechanics
- Designed for quick enjoyment
Discussion Link, Original Link
Wordle" with the first 1000 Digits of Pi [Entertainment]
4 points, 2 comments
Wordle-inspired game using the first 1000 digits of Pi.
- Inspired by Wordle mechanics
- Uses first 1000 digits of Pi as the challenge
- Quick project built in ~6 hours
- Minimalist design, open to feedback
- Focus on gameplay over visuals
Discussion Link, Original Link
I completed mobile fax app in 60 hours [Business]
3 points, 5 comments
A mobile fax app built and submitted to the App Store in 60 hours, including a React Native app, backend, landing page, and successful first-time approval.
- Built with React Native
- Includes backend and landing page
- Approved on first App Store submission
- Offers fax testing page
- Available on the App Store as "Send Fax Pro"
I built a simple tool to automate data into Google Sheets and BigQury [E-commerce]
3 points, 0 comments
SyncRange is a simple, cost-effective data connector tool for Google Sheets and BigQuery, designed for ecommerce and marketing data integration.
- Automates data pipelines into Google Sheets and BigQuery
- Offers a generous free plan and simple pricing
- Supports Shopify, Facebook/Instagram Ads, LinkedIn Ads, Google Ads, Google Analytics, and Google Search Console
- Focuses on ecommerce/marketing client needs
- Built based on validated customer demand
Discussion Link, Original Link
From Hacking a T480 to the Fastest Open-Hardware 75 Hz E-Ink Display [Consumer Tech]
7 points, 0 comments
A fast, open-hardware e-ink display with 75 Hz refresh and sub-100 ms latency, designed for everyday computing and development.
- FPGA-based controller (Caster) for high-speed performance
- Supports 6" to 13.3" mono or color panels
- HDMI or USB-C connectivity
- Multiple grayscale modes
- Open-source hardware, firmware, and schematics
- C API for low-level control
- Community-driven development