Textastic is a text editor designed for iOS programmers that provides you with multiple features. The utility offers you support for more than 80 types of markup languages and source codes, comes with a simple, nicely-designed interface, and gives you access to plenty of editing settings for designing the iOS applications you need.
You can paste snippets of code from other Mac apps, attach comments, evaluate math expressions, merge lines, and much more. All of the aforementioned tasks can be completed by going to the main menu of the program and selecting the preferred editing option.
The program also gives you access to plenty of font and text editing settings (line wrapping, text encoding type, tab width, and many others). You can also select the preferred output settings for HTML, CSS, XML or XSL syntax from the Preferences menu of the program.
However, there's a popular Apple product on the Mac App Store called Xcode which comes without a price tag, offers you dozens of useful features, and is intuitive.
With that being said, I don't think it's worth buying Textastic when you can use the aforementioned Apple application without paying a buck.
v5.0 [Jan 11, 2021]
Textastic 5.0 adds full support for macOS Big Sur with a refreshed user interface and an updated app icon. This release is a macOS Universal app, which can run natively on both Apple Silicon Macs and Intel-based Macs.
New:
• macOS Big Sur: fully updated for compatibility with the latest version of macOS.
• Universal app: runs natively on both Apple Silicon Macs and Intel-based Macs.
Fixed:
• Fixed "Open In…" performance problems on Macs with many CPU cores (e.g. Mac Pro).
• Improved declaration of supported file types so that it works better with other installed apps that can open the same kinds of files.
• Other minor fixes.
