Show HN Daily Selection (2025-04-18)

• AgentAPI – HTTP API for Claude Code, Goose, Aider, and Codex
• val – An arbitrary precision calculator language
• HN Watercooler – listen to HN threads as an audio conversation
• Zuni (YC S24) – AI Copilot for the Browser
• Startup Success Calculator
• BorgLens – Securely access your Borg backup anywhere, anytime on iOS
• Serverless MCP – Debug AWS serverless resources in your IDE
• C++ library for embedded and IoT projects (ESP32)
• Lit.money – Ethically designed to be a private, simple way to see money
• CursorFlow – Visualize your cursor tracks and keystrokes on macOS
• Elfconv – Linux Apps to High-Performance WASM Binary Translator
• Fp-filters – A curated collection of TS/JS array filter functions
• VirutalProg – macOS Virtualization Tool
• Git-chain: A way to manage branch dependencies in Git
• I Built a Site to Track U.S. Tariff Updates in Real Time
• Videoyards – screen recorder with auto-zoom, crop and 4K exports

AgentAPI – HTTP API for Claude Code, Goose, Aider, and Codex [Developer Tools]

96 points, 10 comments

HTTP API for Claude Code, Goose, Aider, and Codex.

• Supports multiple AI models (Claude Code, Goose, Aider, Codex)
• Provides HTTP API access
• Enables integration with various AI tools

Discussion Link, Original Link

val – An arbitrary precision calculator language [Developer Tools]

19 points, 9 comments

A calculator language with arbitrary precision, built using Rust libraries for parsing and error reporting.

• Built with chumsky parser combinator library
• Uses rustyline for line editing
• Implements ariadne crate for error reporting
• Supports arbitrary precision calculations
• Still in development

Discussion Link, Original Link

HN Watercooler – listen to HN threads as an audio conversation [Audio]

40 points, 48 comments

HN Watercooler converts Hacker News threads into audio conversations with unique voices for each commenter, enabling hands-free listening.

• Turns HN threads into natural-sounding audio debates
• Assigns distinct voices to each commenter for consistency
• Introduces context when navigating nested comments
• Browser-only app with no server storage (privacy-focused)
• Supports playback or download for offline listening
• Future plans include playlist generation for multiple threads

Discussion Link, Original Link

Zuni (YC S24) – AI Copilot for the Browser [Productivity]

14 points, 7 comments

Zuni is a browser extension that adds contextual AI capabilities to enhance existing tools like Gmail without replacing them.

• Analyzes emails in Gmail, identifying action items and suggesting responses
• Acts as a thought partner for handling tricky emails
• Maintains browsing session context for natural follow-up questions
• Runs locally first for speed and privacy
• Stores no sensitive data in the cloud

Discussion Link, Original Link

Startup Success Calculator [Business]

15 points, 4 comments

Upload a pitch deck to assess the viability of your startup idea.

• Analyzes pitch decks for startup success potential
• Provides feedback on idea viability
• Simple upload-and-evaluate process

Discussion Link, Original Link

BorgLens – Securely access your Borg backup anywhere, anytime on iOS [Consumer Tech]

3 points, 1 comments

Securely access and manage Borg backups on iOS with full control and security.

• Securely access Borg Backup repositories
• List and view files within specific backups
• Download individual files directly to the device
• Full security and control on the device

Discussion Link, Original Link

Serverless MCP – Debug AWS serverless resources in your IDE [Developer Tools]

8 points, 0 comments

Debug AWS serverless resources directly in your IDE with Serverless MCP.

• Debug AWS serverless resources
• Integrated with IDE
• Serverless architecture support

Discussion Link, Original Link

C++ library for embedded and IoT projects (ESP32) [Developer Tools]

8 points, 0 comments

A C++17/20 library for embedded and IoT projects, particularly ESP32, offering common building blocks and GitHub CI workflows.

• Supports C++17/20 with STL and FreeRTOS integration
• Includes FSM, counters, synchronization primitives, sensors, schedulers, HTTP, WiFi, and Web GUI
• Provides GitHub CI workflows for build automation and checks
• Designed for ESP32 projects and easy integration into existing systems
• Example usage in agro-tech toolkit (bonsai-firmware)

Discussion Link, Original Link

Lit.money – Ethically designed to be a private, simple way to see money [Finance]

9 points, 6 comments

Private, simple money tracking with ethical design.

• Ethically designed
• Privacy-focused
• Simple interface

Discussion Link, Original Link

CursorFlow – Visualize your cursor tracks and keystrokes on macOS [Productivity]

5 points, 1 comments

CursorFlow enhances Mac screen sharing with visual cursor trails, click effects, and keystroke displays for better visibility during demos and collaborations.

• Customizable visual trails for mouse movements
• Highlights clicks with effects and sound
• Displays keystrokes clearly
• Ideal for demos, tutorials, and collaborative sessions

Discussion Link, Original Link

Elfconv – Linux Apps to High-Performance WASM Binary Translator [Developer Tools]

16 points, 0 comments

Elfconv is a binary translator that converts Linux applications into high-performance WebAssembly (Wasm) binaries.

• Translates Linux ELF/AArch64 binaries to WebAssembly
• Achieves 60–80% performance of source-compiled Wasm in benchmarks
• Outperforms QEMU in-browser by ~68x in performance
• Open-source and available on GitHub for testing and contributions

Discussion Link, Original Link

Fp-filters – A curated collection of TS/JS array filter functions [Developer Tools]

10 points, 1 comments

A TypeScript/JavaScript library offering 130+ reusable, functional-style array filter functions for cleaner and more maintainable data transformations.

• Pure functional approach with no side effects
• Composable predicates with combinators (and, or, not)
• Common filter patterns as reusable functions
• Type safety with TypeScript definitions
• Zero dependencies and tiny footprint
• Individual exports for optimized bundling
• 100% test coverage
• Exported as both ESM and CJS

Discussion Link, Original Link

VirutalProg – macOS Virtualization Tool [Developer Tools]

3 points, 0 comments

macOS virtualization tool for running multiple OS instances.

• Virtualization for macOS
• Supports multiple OS instances

Discussion Link, Original Link

Git-chain: A way to manage branch dependencies in Git [Developer Tools]

4 points, 0 comments

Git-chain helps manage branch dependencies in Git.

• Manages branch dependencies
• Works within Git workflow

Discussion Link, Original Link

I Built a Site to Track U.S. Tariff Updates in Real Time [Finance]

10 points, 2 comments

A real-time tracker for U.S. tariff updates to simplify access to current and scheduled tariffs.

• Provides clear, up-to-date information on active and upcoming tariffs
• Aims to reduce confusion from scattered news and government sources
• Designed for both consumers and business owners impacted by tariffs
• Plans to maintain regular updates for accuracy
• Offers a simpler alternative to AI-based search tools for tariff data

Discussion Link, Original Link

Videoyards – screen recorder with auto-zoom, crop and 4K exports [Video]

5 points, 1 comments

A web-based screen recorder for Windows with auto-zoom, 4K exports, and cross-device compatibility.

• Chrome extension for recording
• Auto-zoom with smooth transitions
• Custom cursor and mockup overlays
• Smart video cropping
• 4K export capability
• Fast rendering
• Works on all devices
• Recording history tracking

Discussion Link