All Projects

Maths.Free - Learn all of maths, in order.

Type any maths problem — an equation, a derivative, a matrix, a triangle — and watch it solved step by step with animation, graphs and 3D views. Lessons in algebra, number theory, geometry, calculus, linear algebra and more. Free.

24 seconds per iteration instead of 0.4. I paid for six hours of GPU compute and trained on CPU the

http://Vast.ai

Rent high-performance cloud GPUs at low cost with Vast.ai. Instantly deploy GPU rentals for AI, machine learning, deep learning, and rendering. Flexible pricing, fast setup, and global availability

I built a workout tracker for the few friends you actually want to train with

https://strakk.app/

The social gym app that turns every workout into points, streaks, and bragging rights.

Built a Mac window manager for people juggling too many projects. Thought fellow builders might find

https://betterstage.app/

BetterStage is a macOS window & workspace manager: switch named multi-monitor stages instantly — no SIP, no animation. Per-monitor tiling, tabs, and AI Staging.

Holler & PicKey - Two small iOS apps with no networking code

https://offln.dev/holler

Hold your phone up and let the room read it. Scrolling text with no networking code.

I build AI agents for a living, so I built an engine that checks whether ChatGPT actually recommends

http://citeagent.ai

CiteAgent is the AI SEO platform — Answer Engine Optimization (AEO) and SEO. See whether ChatGPT, Gemini, Claude, and Perplexity recommend you, then ship the fixes on autopilot.

Meta's WhatsApp billing changes killed my side project margins. Here is how I solved the headless se

https://supergreen.cc

Connect WhatsApp & Telegram to n8n, Make, and your apps. Headless sessions pinned to static proxies, real-time webhooks, group chat support, and zero per-message billing.

I built an MCP server for Claude Code, Codex, and OpenCode.

http://fudge.design

Use Fudge to research real website references, inspect visual systems, and develop a concrete design direction.

[AllergyCard] - A bilingual restaurant allergy-card builder with free preview

https://allergycard.app

Create a printable food allergy card in Japanese, Korean, Thai, Chinese, Spanish, and 5 more languages. Free to preview. Download PNG or PDF for $8.99.

My weekend project had a pretty wild 5 days

https://worldsweeper.site/

Minesweeper on a map of Earth. Dig through more than 100 million land tiles, flag mines, and survive with skills, loot, and starter builds.

A year on my side project, 4 testers, 0 retention. Turned out the core feature had never worked for

https://testflight.apple.com/join/QUQMNFZb

Available on iOS

Built RenderMD because I was tired of sending markdown files around

https://markdownlivepreview.com/

This is the online markdown editor with live preview.

Built a file converter that converts everything 100% in your browser (React + Wasm)

https://byteshift.app

Convert files locally in your browser with no account and no upload for conversion. Browser and device limits may still apply.

I built a daily game about the one statistic everyone has an opinion on and nobody has looked up

https://www.dickle.online

Dickle is a free daily game where you guess the average penis size in a different country every day, in 5 tries. Every figure comes from a published study. See how well you actually know the data.

Does unsigned open source software train users to disable antivirus?

http://www.skiffssh.me/

Self-hosted SSH access control and audit. Approval-gated production access, a hash-linked audit log you can verify, and session recording — on your machine.

i made a browser extension that removes the algorithm from every major social platform

https://notforyou.app/

A browser extension that removes the algorithm from every major social platform. Just the people you actually followed, in the order they posted.

Giveaway dilemma: how do you pick a winner without the contest being unfair, boring, or easy to chea

http://runara.me

A native Apple Watch + iPhone workout companion with deep Apple Health integration. No accounts, no cloud, no analytics. Configure on iPhone, run on your wrist.

I built an alternative to juggling Jira/Linear + Notion + GitHub for software projects

https://getordoa.com/

Plan and track work with Kanban boards, project docs, cycles, and GitHub sync. A connected workspace for small engineering teams. Start free.

InkMeet - an all-in-one for tattoo artists that also makes them discoverable by AI (ChatGPT, Perplex

http://inkmeet.app

Discover verified tattoo artists by style and city. Browse portfolios, get a transparent quote, and book your session online with a secure deposit. No account needed.

We made a tool to help you automate your marketing

http://replyhey.com/

Daily scored Reddit leads with the reply already drafted, plus a posting plan that respects each subreddit’s rules.

I built a tool that scores how Ai-written your site sounds. My own homepage got 6 out of 100.

https://www.getsitetell.com/

We crawl every page, flag the exact words and patterns that read as generic AI copy, and show you why: score, evidence, and a rule-grounded rewrite. Free for your whole site.

billboardo is the place to showcase your work.