Welcome! I develop privacy-focused apps and tools for iOS and macOS. Take a look.
Apps
Qrafter
QR Code Scanner & Generator
The most powerful QR code companion since 2011. Scan, create, and manage QR codes with custom designs and enterprise-grade encryption.
Offline-First
Custom Designs
AES-256 Encryption
Junkman
Smart SMS Blocker
Intelligent SMS filtering powered by on-device machine learning. Block spam before it reaches your inbox, without sending your data anywhere.
On-Device AI
Multi-Language
Zero Data Collection
Begone
Spam Call Blocker
A powerful call blocker with intelligent wildcard filtering. Protect yourself from robocalls and spam with community-powered block lists.
Wildcard Blocking
Community Lists
100% On-Device
PSWD
Password Generator
Generate strong, unique passwords instantly. Simple, fast, and completely offline. Your passwords never leave your device.
Offline
Customizable
Private by Design
Tools
asc-client
App Store Connect CLI
A native command-line tool for the entire App Store release pipeline. Create versions, upload builds, manage screenshots, update localizations, and submit for review, all from the terminal.
Native Swift
Workflow Automation
Open Source
Featured Blog Posts
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asc-client: A Swift CLI for the App Store Connect API
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If you’ve ever shipped an iOS app, you know the ritual. Open Xcode, archive, wait, open App Store Connect in the browser, click through a…
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Using udp2raw to bypass censoring on Wireguard protocol
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Many authoritarian states try to censor free speech. To do this, they block access to web sites, commercial VPNs, VPN protocols, and in some cases…
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WireGuard MTU fixes
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UPDATE: I researched a little more on this. ipv6 connections require 1280 as the minimum MTU and most router configurations expect to see some standardized…
Latest Blog Posts
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Moving to keremerkan.dev
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I moved this site from keremerkan.net to keremerkan.dev. All old links redirect automatically: bookmarks, search results, and shared URLs will keep working. Why the Change…
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W-8BEN-E instructions for Apple and Google
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I wasn’t able to find good instructions to fill out W-8BEN-E form for Apple Developer and Google AdMob/AdSense. There were some partial information on different…
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Apple ve Google için W-8BEN-E yönergeleri
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Apple Developer ve Google AdMob/AdSense için W-8BEN-E formunun doldurulması için düzgün bir kaynak bulamıyordum. Farklı kaynaklarda parça parça bilgiler olsa da, özellikle bölüm III’te ne…