Özgür Güler

Coğrafist

Education app · iOS, Android, webApp Store · Google Play · Web

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A map-based app for studying geography for Türkiye’s KPSS civil service exam.

• cografist.app (opens in a new tab)
• App Store (opens in a new tab)
• Google Play (opens in a new tab)

Goal

Let people study geography by playing on a map and answering explained questions instead of memorising lists.

What I built

• 30+ study modes including map games and an explained question bank, with progress tracking
• One React + TypeScript codebase, packaged for iOS and Android with Capacitor
• Firebase for sign-in, data, push notifications and Cloud Functions; RevenueCat for subscriptions
• A small support-mail system on Cloudflare Workers with D1, R2 and Queues

Outcome

On the App Store and Google Play since April 2026. Web version at cografist.app.

Stack

React · TypeScript · Capacitor · Firebase · RevenueCat · Zustand · Playwright · Cloudflare Workers

A pipeline that finds space news, writes a Turkish article, translates it into five languages and publishes it on WordPress.

• galaktikuzay.com (opens in a new tab)
• GitHub (opens in a new tab)

Goal

I run Galaktik Uzay on my own. I wanted news tracking, writing, image search, translation and publishing to run on a schedule instead of by hand.

What I built

• A Cloudflare Worker written with Hono: searches news via Tavily, drops duplicates and stale stories using D1, and gets a structured Turkish draft from Azure OpenAI
• Looks for images on the NASA Images API first, then Serper; publishes or drafts the post through the WordPress REST API
• A separate translation Worker produces English, German, Spanish, French and Dutch editions, linked together with Polylang
• A Next.js admin panel that keeps Worker credentials server-side, with HMAC-signed HttpOnly session cookies

Outcome

galaktikuzay.com publishes in six languages. Code and CI are public on GitHub.

Stack

Cloudflare Workers · Hono · D1 · TypeScript · Azure OpenAI · Next.js · WordPress REST API · GitHub Actions

Dönerci

Mobile game · Godot 4App Store · Google Play

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A 3D tycoon game about running and growing a döner shop.

• donerci.ozgurguler.tech (opens in a new tab)
• App Store (opens in a new tab)
• Google Play (opens in a new tab)

Goal

Build a mobile game myself and ship it on both stores, including gameplay, ads, purchases and the server side.

What I built

• Customer flow, table unlocks, staff, a second branch, missions and offline earnings in GDScript
• Rewarded and interstitial ads with AdMob; purchases with Google Play Billing and StoreKit 2
• Remote config (KV) and rate-limited error reporting on a Cloudflare Worker
• Purchase rewards are only granted after server-side receipt validation; a Durable Object stops the same receipt from being processed twice

Outcome

Released on the App Store and Google Play in September 2026. Available in five languages.

Stack

Godot 4 · GDScript · AdMob · Google Play Billing · StoreKit 2 · Cloudflare Workers · Durable Objects · Codemagic

Print Fast

Mobile app · thermal printingApp Store · Google Play

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Prints receipts, labels and barcodes from a phone to Bluetooth or Wi-Fi thermal printers.

• App Store (opens in a new tab)
• Google Play (opens in a new tab)

Goal

Let small businesses print receipts and labels from a phone without a separate POS system.

What I built

• Generates ESC/POS and CPCL commands and sends them over BLE, classic Bluetooth (Android) or a TCP socket
• Drag-and-drop receipt and label templates, barcode and QR generation, camera barcode scanning, a product catalog
• Works offline; subscriptions through RevenueCat, remote config and error reporting

Outcome

On the App Store and Google Play since March 2026.

Stack

Next.js · React · TypeScript · Capacitor · Bluetooth LE · ESC/POS · RevenueCat

Two small services for sharing files and text from the terminal with a single curl command.

• files.ozgurguler.tech (opens in a new tab)
• paste.ozgurguler.tech (opens in a new tab)
• OFile GitHub (opens in a new tab)
• OPaste GitHub (opens in a new tab)

Goal

A fast, tracker-free place where scripts and AI agents can drop files and text without an account.

What I built

• Both run entirely on Cloudflare Workers; files in R2, metadata in Workers KV
• Detects curl, wget and PowerShell and answers in plain text; supports uploads from stdin and a /raw endpoint
• OFile deletes files after 24 hours and OPaste after 30 days; total storage is capped at 8 GB to keep costs predictable

Outcome

Running at files.ozgurguler.tech and paste.ozgurguler.tech. Both repos are MIT-licensed.

Stack

Cloudflare Workers · R2 · Workers KV · JavaScript

Transcribes audio in the browser without sending it to a server.

• Live demo (opens in a new tab)
• GitHub (opens in a new tab)

Goal

Transcribe audio and video for free, with no backend, without the file leaving the device.

What I built

• Whisper models (tiny, base, small) run through Transformers.js in a Web Worker, on WebGPU when available and WASM otherwise
• Word-level timestamps, click any word to jump to it, simple speaker separation
• Export to JSON, SRT and VTT; six languages

Outcome

Live on Vercel, source on GitHub.

Stack

React 19 · TypeScript · Vite · Transformers.js · WebGPU · Web Workers