Show HN Daily Selection (2025-08-29)
- SwiftAI – open-source library to easily build LLM features on iOS/macOS
- A private, flat monthly subscription for open-source LLMs
- Yoink AI – macOS AI app that edits directly in any textfield of any app
- Grammit – Local-only AI grammar checker (Chrome extension)
- Knowledgework – AI Extensions of Your Coworkers
- MCPcat – A free open-source library for MCP server monitoring
- Csvqsh – SQL-like query language for CSV in Awk
- Txtos for LLMs – 60 SEC setup, long memory, boundary guard, MIT
- I fine-tuned GPT4.1 on my iMessage history
- Created a Node.js's addon that can handle 1M req/s
- AI Agent in Jupyter – Runcell
- Karton is a simple, type-safe RPC and state-syncing framework (OSS,MIT)
- precision asteroid orbital dynamics library
- Simple PDF Scanner – fast, one-time iOS scanner app
- AIKit - Minimal library for calling OpenAI, Anthropic, Gemini gen APIs
- Pocket Agent: run Claude, Cursor, Codex and more from your phone
- AI-powered video analysis tool that generates 800 word content prompts
- GrowChief – open-source social media outreach tool
SwiftAI – open-source library to easily build LLM features on iOS/macOS [Developer Tools]
45 points, 8 comments
SwiftAI is an open-source Swift library for iOS/macOS that seamlessly integrates on-device and cloud-based LLMs with a unified API.
- Single, model-agnostic API for both local and cloud LLMs
- Supports Apple’s on-device LLMs (free, private, offline) with fallback to cloud models
- Includes agent/tool loop and strongly-typed structured outputs
- Optional chat state management
- Centralizes model selection logic to avoid duplicate code paths
Discussion Link, Original Link
A private, flat monthly subscription for open-source LLMs [Developer Tools]
13 points, 5 comments
Private monthly subscription service for open-source LLMs with OpenAI-compatible API support.
- Privacy-focused open-source inference
- Flat monthly subscription model
- Compatible with OpenAI API clients (Cline, Roo, KiloCode, Aider)
- Higher rate limits than Claude
- Affordable backup option for rate-limited users
Discussion Link, Original Link
Yoink AI – macOS AI app that edits directly in any textfield of any app [Productivity]
16 points, 6 comments
Yoink AI is a macOS app that enables AI-powered text editing directly in any text field with a hotkey, eliminating the need for copy-pasting.
- Works in any text field across all apps via ⌘ Shift Y hotkey
- Auto-captures context to avoid manual priming
- Custom voices trained on user writing samples for personalized output
- Suggests edits as redlines for user approval
- Free tier (10 requests/month) and pro trial (100 requests for 7 days)
Discussion Link, Original Link
Grammit – Local-only AI grammar checker (Chrome extension) [Text]
21 points, 4 comments
Grammit is a Chrome extension that performs local-only AI grammar checks and writing assistance using an LLM.
- Runs entirely locally, ensuring text never leaves your computer
- Uses an LLM for advanced grammar, factual corrections, and contextual suggestions
- Includes an in-page writing assistant for rephrasing or drafting text
- Built with cutting-edge web features like Chrome's Prompt API, Anchor Positioning API, and CSS Custom Highlights
- Early adopter of bleeding-edge tech, uncovering new Chrome bugs in the process
Discussion Link, Original Link
Knowledgework – AI Extensions of Your Coworkers [Productivity]
3 points, 0 comments
AI clones of coworkers that capture and share work knowledge to improve team productivity.
- Creates AI extensions of teammates that know their work context and respond instantly
- Captures screenshots every 5 seconds to build a searchable, hyperlinked knowledge base
- Optimized for privacy with fine-grained access control and encryption
- Supports small, tight-knit teams using Macs, Slack, Notion, and Claude Code Max
- Free to install and use initially, with plans for SOC II compliance and on-prem options
Discussion Link, Original Link
MCPcat – A free open-source library for MCP server monitoring [Developer Tools]
12 points, 3 comments
MCPcat is a free, open-source library for MCP server monitoring that provides logging, observability, and user session tracking.
- One-line integration for logging and observability with OpenTelemetry support
- Custom support for Datadog and Sentry
- Tracks and categorizes events within user sessions
- Optional sensitive data redaction with no server-side data handling
- Includes a dashboard for visualizing user journeys (free for open-source projects)
- Available as Python and TypeScript SDKs, with more SDKs planned
Discussion Link, Original Link
Csvqsh – SQL-like query language for CSV in Awk [Developer Tools]
3 points, 0 comments
SQL-like query language for CSV files implemented in Awk for lightweight modifications.
- Lightweight alternative to csvq
- Simple CSV modifications without Go environment
- Includes test cases in the script
Discussion Link, Original Link
Txtos for LLMs – 60 SEC setup, long memory, boundary guard, MIT [Developer Tools]
4 points, 0 comments
TXTOS is a portable, plain-text OS for LLMs that provides long-term memory and knowledge boundary checks without requiring setup or code.
- Semantic Tree Memory: Records ideas and relations, enabling stable recall across sessions and avoiding repetition.
- Knowledge Boundary Guard: Flags and handles out-of-scope queries instead of hallucinating answers.
- Simple Rules: Enforces citation, concise responses, and audit trails for transparency.
- Zero-Install & Portable: Works across LLM providers via a single .txt file (MIT-licensed, no scripts/trackers).
- Quick Setup: Paste the file into any LLM chat and test memory/boundaries in under 60 seconds.
Discussion Link, Original Link
I fine-tuned GPT4.1 on my iMessage history [Life Assistant]
9 points, 6 comments
One-sentence summary: A user fine-tuned GPT4.1 on their iMessage history.
- Custom AI model trained on personal iMessage data
- Potential for personalized messaging insights or automation
Discussion Link, Original Link
Created a Node.js's addon that can handle 1M req/s [Developer Tools]
5 points, 0 comments
A high-performance Node.js HTTP framework built with Rust and Hyper, capable of handling 1M requests per second.
- Built directly on Hyper for minimal abstraction
- Uses N-API for Node.js bindings
- Supports both synchronous and async (Tokio/Hyper) engines
- Focused on raw performance rather than plugins
- Experimental stage, seeking feedback on API design and middleware patterns
AI Agent in Jupyter – Runcell [Developer Tools]
8 points, 1 comments
AI-powered Jupyter Lab agent that writes and executes code with contextual understanding.
- Understands context (data, charts, code) in Jupyter Lab
- Built-in tools for editing/executing cells, file I/O, and web search
- Focuses on dynamic Jupyter environment (kernel state, cell-specific actions)
- Operates as an autonomous agent, not just a chatbot
- Easy installation via
pip install runcell
Discussion Link, Original Link
Karton is a simple, type-safe RPC and state-syncing framework (OSS,MIT) [Developer Tools]
4 points, 0 comments
Karton is a type-safe, web socket-based RPC and state-syncing framework for synchronizing state between server and client applications.
- Defines a shared "Karton contract" for syncing state and procedures between server and client
- Efficiently syncs state deltas using JSON-style patches (powered by immer)
- Offers vanilla TS and React-specific clients with Zustand-style state access
- Designed for simplicity with a single shared output type
- MIT-licensed, available on npm, and used in production
Discussion Link, Original Link
precision asteroid orbital dynamics library [Developer Tools]
4 points, 0 comments
A Python (with Rust backend) library for high-accuracy orbital calculations of all known asteroids, designed to function like JPL Horizons but locally.
- Full N-Body integrator with relativistic effects and non-spherical gravitational fields
- Includes non-gravitational forces like radiation pressure
- Used by NASA missions (NEO Surveyor, SPHEREx, Roman) for asteroid prediction
- Open-sourced and actively developed for PhD research
- Visualizes asteroid orbits, such as the Hildas group synchronized by Jupiter
Discussion Link, Original Link
Simple PDF Scanner – fast, one-time iOS scanner app [Productivity]
4 points, 2 comments
Simple PDF Scanner is a lightweight iOS app for quick scanning without subscriptions.
- OCR support
- Password-protected PDFs
- Custom filenames
- Camera and photo import
- A4 paper size support
- Planned: quality controls, file size estimation, more paper sizes, history
Discussion Link, Original Link
AIKit - Minimal library for calling OpenAI, Anthropic, Gemini gen APIs [Developer Tools]
3 points, 1 comments
AIKit is a minimal TypeScript wrapper for unified access to OpenAI, Anthropic, and Google Gemini generation APIs.
- Unified access to multiple AI generation APIs
- Supports streaming, multimodal inputs, and tool calling
- No extra runtime packages, uses built-in fetch
- Works with modern Node and browsers
Discussion Link, Original Link
Pocket Agent: run Claude, Cursor, Codex and more from your phone [Developer Tools]
3 points, 0 comments
Pocket Agent is a mobile-first interface for coding agents like Claude, Cursor, and Codex, enabling real-time interaction with dev environments from a phone.
- Open-source Pocket Server for secure environment exposure
- Mobile app for chatting with agents and monitoring terminal sessions
- Approve or deny file edits, searches, or commands
- Launch and track cloud background agents
- Manage multiple projects/sessions from a phone
- Supports Mac, Linux (Windows soon) and community contributions like Tailscale pairing
Discussion Link, Original Link
AI-powered video analysis tool that generates 800 word content prompts [Video]
3 points, 0 comments
AI-powered tool that converts videos into detailed content prompts and analysis reports.
- Supports multiple video formats (MP4, MOV, AVI, WebM) and platform URLs (YouTube, TikTok)
- Generates 600-800 word professional analysis reports with engagement insights
- Multi-AI integration with intelligent fallback and deep analysis mode
- Real-time processing with progress indicators and platform-agnostic video handling
- Built with Next.js 14, React 18, TypeScript, and serverless architecture (Vercel)
- Free to use with live demo available
Discussion Link, Original Link
GrowChief – open-source social media outreach tool [Marketing]
8 points, 2 comments
Open-source tool for social media outreach.
- Open-source
- Social media outreach
- Community-driven