Show HN Daily Selection (2025-10-07)
- Kent Dybvig's Scheme Machine in 400 Lines of C (Heap-Memory Model)
- I've build a platform for writing technical/scientific documents
- ElevenLabs UI shadcn/UI components for audio
- I built an open-source AI data layer that connects any LLM to any data
- A Digital Twin of my coffee roaster that runs in the browser
- Write It Down – Personal finance tracker
- Tangled – Git collaboration built on AT Protocol
- Meihus – Mortgage calculator that shows early payment impact monthly
- TinqerJS– LINQ-inspired QueryBuilder for TypeScript + Postgres/SQLite
- Open-source testing framework for AI agents with semantic validation
- Gorbes – Forbes ranks wealth, Gorbes ranks value created for others
- I Built a Transcription CLI Because Uploading 4GB Videos Was Killing Me
- Envirobly – Efficient App Hosting
- A Node.js CLI tool to generate ai.txt, llms.txt, robots.txt, humans.txt
Kent Dybvig's Scheme Machine in 400 Lines of C (Heap-Memory Model) [Developer Tools]
180 points, 33 comments
Scheme Machine implementation in 400 lines of C, modeling heap memory.
- Implements Kent Dybvig's Scheme Machine
- Written in 400 lines of C code
- Models heap memory for Scheme execution
Discussion Link, Original Link
I've build a platform for writing technical/scientific documents [Text]
31 points, 16 comments
Platform for writing technical/scientific documents.
- Designed for technical and scientific documentation
- Streamlined writing and formatting tools
- Supports collaborative editing and version control
Discussion Link, Original Link
ElevenLabs UI shadcn/UI components for audio [Developer Tools]
3 points, 0 comments
ElevenLabs UI provides shadcn/UI components for audio and agent integration in Next.js.
- Built on top of ShadCN for Next.js
- Includes audio and agent components
- Open-source GitHub repo coming soon
- Designed for developer feedback and improvement
Discussion Link, Original Link
I built an open-source AI data layer that connects any LLM to any data [Developer Tools]
10 points, 0 comments
An open-source AI data layer that connects any LLM to any data source with centralized context and governance.
- Centralizes context management with instructions, external sources, and self-learning
- Uses agentic workflows (ReAct loops) for reasoning, tool use, and reflection
- Generates visuals, dashboards, and scheduled reports via chat/commands
- Ensures reliability with quality, accuracy, and performance scoring (LLM judges)
- Provides advanced access & governance (RBAC, SSO/OIDC, audit logs, rule enforcement)
- Deployable in your environment (Docker, Kubernetes, VPC) with full infrastructure control
Discussion Link, Original Link
A Digital Twin of my coffee roaster that runs in the browser [Consumer Tech]
3 points, 0 comments
A browser-based digital twin of a coffee roaster for virtual roasting practice and planning.
- Data-driven model based on historical roast data
- Custom ML modules incorporating roaster and bean physics
- Trained on real roasts (default bean: Ethiopian Guji)
- Enables risk-free experimentation and intuition building
- Future plans to add more roasters and control tracking features
Discussion Link, Original Link
Write It Down – Personal finance tracker [Finance]
256 points, 169 comments
A simple, no-frills personal finance tracker built as a Google Sheet that gained unexpected popularity.
- Started as a personal tool for tracking income, expenses, and savings
- Shared on Reddit and organically grew to 130k+ views without promotion
- Now used by over 2,300 people via write-it-down.com
- Focuses on practicality over hype (no AI, no funding)
- Proves the value of solving real problems with simple solutions
Discussion Link, Original Link
Tangled – Git collaboration built on AT Protocol [Developer Tools]
7 points, 0 comments
Git collaboration tool built on the AT Protocol.
- Built on AT Protocol
- Facilitates Git collaboration
Discussion Link, Original Link
Meihus – Mortgage calculator that shows early payment impact monthly [Finance]
18 points, 9 comments
Mortgage calculator showing the impact of early payments on monthly savings and interest over time.
- Designed for global use, not limited to the US
- Flexible loan data input options
- Visualizes long-term interest savings from early payments
Discussion Link, Original Link
TinqerJS– LINQ-inspired QueryBuilder for TypeScript + Postgres/SQLite [Developer Tools]
4 points, 0 comments
TinqerJS is a LINQ-inspired QueryBuilder for TypeScript that works with Postgres and SQLite.
- LINQ-inspired syntax for querying
- Designed for TypeScript
- Supports Postgres and SQLite databases
- Provides a fluent query builder interface
Discussion Link, Original Link
Open-source testing framework for AI agents with semantic validation [Developer Tools]
3 points, 0 comments
Open-source testing framework for AI agents that uses GPT-4 as a judge for semantic validation.
- Evaluates text responses for semantic meaning
- Validates tool calls (correct tools and order)
- Supports multi-turn conversation testing
- Composable JSON pipeline for building custom test blocks
Discussion Link, Original Link
Gorbes – Forbes ranks wealth, Gorbes ranks value created for others [Business]
4 points, 0 comments
Gorbes ranks individuals by the value they've created for others, contrasting personal wealth with distributed value.
- Measures Distributed Value: Calculates the portion of a company's value held by others due to an individual's work or leadership.
- Uses Public Data: Applies a formula (Enterprise Value × (1 − Ownership%) × Role Weight) to estimate impact.
- Contrasts Metrics: Compares personal net worth with distributed value to highlight wealth creation for others.
- Early-Stage Project: Seeks feedback on methodology, data sources, and alternative impact measurements.
Discussion Link, Original Link
I Built a Transcription CLI Because Uploading 4GB Videos Was Killing Me [Audio]
4 points, 1 comments
Transcription CLI tool for large video files without uploading.
- Handles large video files (e.g., 4GB) locally
- Avoids uploading to external servers
- Command-line interface for ease of use
- Focuses on transcription functionality
Discussion Link, Original Link
Envirobly – Efficient App Hosting [Developer Tools]
6 points, 6 comments
Envirobly is a fully bootstrapped, efficient application hosting platform designed for reliability and global scalability.
- Utilizes cloud efficiency while avoiding expensive value-added services
- Supports global hosting to be close to users
- Includes backups, logging, monitoring, auto-scaling, containerization, and databases
- Prioritizes simplicity and user-friendliness
- Built with a focus on reliability and stability from the start
Discussion Link, Original Link
A Node.js CLI tool to generate ai.txt, llms.txt, robots.txt, humans.txt [Developer Tools]
7 points, 0 comments
Node.js CLI tool for generating various text files like ai.txt, llms.txt, robots.txt, and humans.txt.
- Automates creation of ai.txt, llms.txt, robots.txt, and humans.txt
- Simple command-line interface for quick file generation
- Designed for Node.js environments