If you want a secure and accessible writing interface with customizable editing tools and encryption, NovelAI is a great option. It offers a subscription-based service that uses AI to write stories and stores data with XSalsa20 encryption. It also offers customizable text adventure modules, character visualization and a lorebook to store world-building details. It offers a range of pricing options from free to $25/month, so you can pick the tier that works for you.
Another good option is LivingWriter, which can help authors organize and structure their manuscripts with an AI Outline Generator and a drag-and-drop interface for chapters and sections. It also offers smart text, auto-suggest, writing goals and export options to PDF, DOCX and more. It uses encrypted cloud storage and synchronizes across multiple devices so your work is protected and accessible wherever you are.
For those who want a more complete writing environment, Novelcrafter has a range of tools including a personal Wiki for tracking story details and multiple writing modes. It also supports AI-powered tools and customizable tags and labels, so it's good for planners and pantsers. It's available on a variety of pricing tiers, so you can pick the one that works for your writing style and needs.
Last, StoryNest.ai has a wide range of tools to help you craft compelling stories, including character creation, world-building and AI-assisted editing. It can handle multiple formats, including short stories, novels and interactive fiction, and has collaboration tools. You can sign up for free to try it out, so it's a good option for writers who want to experiment.