gKeep is described as 'brings Google Keep to iOS. gKeep optimizes the Google Keep experience for the iPhone. No ugly black bar at the top, no horizontal scrolling, and other enhancements to the web app. This app does not store any of your account information. Note: Essentially, this is a web app' and is an app in the Office & Productivity category. There are more than 10 alternatives to gKeep for a variety of platforms, including Online / Web-based, iPhone, Mac, Windows and Android. The best alternative is Google Keep, which is free. Other great apps like gKeep are Quillnote (Free, Open Source), Memrey (Freemium), Tidily.io (Paid) and Noted (Freemium).
Take beautiful markdown notes whenever you feel inspired. Place them in notebooks and tag them accordingly. Stay organized by making task lists, set reminders and keep everything in one place by attaching related files.
Notebook PEAs - encryption of notes. Protects your private notes with a password. The text is never stored unencrypted on your disk (until you explicitly decide to do that). The used cryptographic primitives are currently considered as safe as possible.