a vs Test Passkeys

a-Shell is a complete local terminal emulator, allowing to run most Unix commands on your iOS device. You can transfer files using scp and curl, edit them with vim and ed, process them using grep, awk and sed. You can work with git repositories using lg2.  Most commands are compiled for iOS native Arm64 format, making them fast and well integrated with the BSD Unix that powers iOS/iPadOS. a-Shell includes Python, Lua, Perl, JavaScript, C, C++ for programming and TeX (texlive 2025, with Tikz and LuaTeX) for text processing. There are also multiple network utilities: nslookup, ping, whois, ifconfig... Type help for help, help -l to get the full list of commands. a-Shell can be controlled from Shortcuts: run commands in order, process files in a-Shell, get the results as text or files, transfer files to other apps... a-shell uses iOS 13+ “multiple windows” ability, so you can run multiple shells at the same time, with different commands, in different directories. You can edit a file in one window with vim and process it in the other with python. Compile your C or C++ programs to webAssembly using clang or clang++, and execute the resulting binary. A complete webAssembly SDK is included (WASI-libc). a-Shell is the complete version. If you need a smaller app, and you don't need a C compiler, a TeX engine, or numpy and matplotlib, there is a-Shell mini.

Test Passkeys is a hands-on sandbox for learning how passkeys and WebAuthn really work: on a real device, against a real server, with nothing hidden behind a diagram. Most explainers stop at the arrows. This app lets you run the ceremonies yourself, change the parameters, and read every field that crosses the wire. PLAYGROUND Create passkeys and authenticate with them, then inspect the whole exchange: * Configure user verification, attestation, authenticator attachment, resident keys, algorithms and hints - then see what the device does with each * Change the relying party ID and watch iOS accept or reject it, and find out why * Switch between standard and conditional request styles * Read the raw challenge, clientDataJSON, authenticator data and signature for every ceremony * Rename, inspect and delete the passkeys you create LEARN Guided lessons on what passkeys are, how the ceremony fits together, why they are phishing resistant and breach proof, and how platform support is evolving - plus curated links into the WebAuthn, FIDO Alliance and Apple references when you want to go deeper. YOUR ACCOUNT Sign in with a passkey or a password, manage the passkeys registered to your account, and lock the app itself behind Face ID, Touch ID or a PIN. Playground passkeys are purely a learning tool - they are never used to authenticate you anywhere, and the passkeys protecting your own account are kept entirely separate. Experiment as freely as you like. Built for developers integrating WebAuthn, and for anyone who wants to see what is actually happening when they tap "Sign in with a passkey". Free. No ads, no tracking.