When comparing Slap vs Textastic, the Slant community recommends Textastic for most people. In the question“What are the best programming text editors?” Textastic is ranked 45th while Slap is ranked 47th.
Specs
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Pros
Pro First-class mouse support
Slap supports mouse keybindings even though it works inside the terminal and also through SSH.
Pro Uses desktop-like keybindings
Slap features configurable keybindings (Ctrl+S, Ctrl+Z, etc).
Pro Great terminal interface
Pro iOS version available
Pro Supports 80 source code and markup languages
Textastic has support for several script and markup languages.
Pro Very fast
There's no need for hundreds of modules to be loaded on every start of Textastic. It's perfect for the fast editing of files.
Pro Supports online sync
Textastic can sync with iCloud documents.
Pro Code completion
Cons
Con Requires node.js
Slap is written in JavaScript and it requires something to interpret it in a local machine. That something is node.js, but for people who don't need node, it would be a hindrance and an overkill to install node just to use a simple text editor. Furthermore, it can only be used remotely if the remote machine has node installed.
Con CLI only
Slap only runs through the terminal.
Con Mac only
Textastic is for Mac only.
Con Proprietary
Textastic is a proprietary software and needs a license which costs $7.99.