1. Show HN: Typebase – A single-folder back end you write in TypeScript (typebase.io)

Write actions, a database schema, and auth as TypeScript files in a typebase/ folder inside your app. Your frontend calls them like local functions, end-to-end typed, zero REST boilerplate.

Typebase combines the ease of use found in Convex with the flexibility of Supabase, allowing developers to define database tables directly in TypeScript files within their existing projects. This library aims to streamline backend development by eliminating the need for complex SQL and authorization models.

2. Show HN: Galaxium, an experimental WebGPU space explorer (galaxium.app)

Explore the universe in 3D: fly from Earth to planets, stars, nebulae and distant galaxies, right in your browser.

Galaxium allows users to navigate a 3D representation of the universe directly in their browser, offering an interactive experience to travel from Earth to various celestial bodies and beyond. It’s a unique tool for space enthusiasts and anyone curious about our cosmos.

10. Show HN: Sesame - a local-first, open-source password manager (usesesame.app)

An open source password vault for Windows. Import passwords, 2FA codes, and recovery details. Sesame never receives your vault. Free download.

Sesame is an open-source password manager designed to prioritize user privacy by keeping vaults stored locally without requiring an account. The developer is seeking feedback and testing on this early version, which is still undergoing a security review.

11. Show HN: Laser Graffiti (laser.consti.de)

Point a projector and a webcam at a wall, draw with a laser pointer, and the projector paints your strokes. Open source, runs in the browser.

12. Show HN: SubSmith – Turn your own videos into language-learning material (subsmith.app)

Learn languages from real content. Generate transcripts, look up words instantly, and mine sentences to Anki. All processed locally.

SubSmith simplifies the process of creating language-learning materials from videos by consolidating various tools into one platform. It allows users to easily extract sentences and study them without the hassle of juggling multiple applications.

19. Show HN: Watches user sessions, finds bugs that matter, and fixes them (github.com)

Opslane finds the bugs your users run into by watching real user sessions, and writes the fix. You review and merge. - opslane/opslane

Opslane is an open-source tool designed to identify and fix user-facing bugs automatically by creating pull requests only after verifying the solutions. Abhishek, its creator, shares insights from his experience at Robinhood and how this tool could streamline bug management for developers.

20. Show HN: We built open OpenRouter that turns usage into a better model (github.com)

An open source model gateway that provides one control plane across closed, open-source, local, and custom models. - experientiallabs/experiential

An open source model gateway has been developed to streamline the management of various self-hosted and open source models. Built in Rust for efficiency, it handles multiple configurations and minimizes latency, making it a practical tool for developers working with machine learning models.

25. Show HN: Build your own theme park (www.magicpatterns.com)

Create your own theme park in seconds. Describe the roller coasters, rides, attractions and scenery you want, and watch your park come to life.

An engineer has developed an AI agent that lets you create custom theme parks reminiscent of Rollercoaster Tycoon, generating cohesive designs based on simple prompts. The project applies techniques from AI-generated websites, showcasing an innovative intersection of gaming and design technology.

26. Show HN: A lightweight, stateless database for agent memory (polign.com)

Polign is a new lightweight, stateless database designed for efficient agent memory management, utilizing your own S3 or GCS bucket for storage. With a focus on structured queries and typed facts, it promises quick node restarts and impressive search capabilities.

28. Show HN: Voronoi Go (voronoigo.com)

Play the ancient game of Go without the grid. Capture territory and best your opponent in a flowing, geometry-driven battle of wits.

Voronoi Go has introduced a strong bot for players and now supports correspondence games, making it easier to connect with opponents. Check out the updates that enhance the gameplay experience and community engagement.

29. Show HN: My Claude quota ran out in 10 minutes, so I made a tool to find out why (github.com)

Ask Claude Code where your usage went. Token audit, limit diagnosis and usage forensics — built from the session logs already on your machine, nothing leaves it. - kelviq/tare

A new tool called Tare helps users analyze their Claude usage by auditing tokens and diagnosing limits based on session logs stored locally. It offers insights into how quickly your quota is consumed without sending any data off your machine.

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