Based on experience, since I have both LTDs.

Voila, a Chrome extension operating directly on webpages, is distinguished for its seamless integration and swift results. Its operational style is akin to ChatGPT’s, offering outputs word by word in real-time. On the other hand, Magai, an all-encompassing AI platform, delivers entire responses at once while also boasting extended features such as AI image creation, background removal from images, image upscaling and the ability to decode webpage content via URL pasting.

Custom prompts feature in both these tools - referred to as “Actions” in Voila and “Saved Prompts” in Magai. Notably, Magai steps beyond this aspect with its ‘Custom Personas’ option providing pre-built templates like Academic Researcher, Expert Copywriter or Journalist to supplement your prompts.

Organization in these platforms differs too - Voila provides a Chat History whereas Magai offers Folders for arranging chat sessions. Both allow users to mark favorite chat histories and come equipped with search functions, enabling comprehensive chat history searches unlike like ChatGPT.

Visually pleasing user interfaces enhance the appeal of both these tools. Furthermore, they provide language model options between ChatGPT versions 3.5 and 4 alongside Claude Ai available only on Magai that enrich user interaction.

Regardless of their differences, both Voila and Magai can add powerful capabilities to your digital toolbox. So whether you’re using Voila’s prompt library or experimenting with Magai’s Custom Personas – there’s plenty of AI-driven fun and productivity waiting for you!

Access:

Voilà: Only available as a Chromium Extension; easy and fast to launch; not available on Safari or Apple mobile devices.
Magai: Available as a web app; mobile and Chrome Extension on the roadmap; mobile version works smoothly with some limitations.

Basic Operations:

Voilà: Captures highlighted text in-browser with a popup window; unable to resume closed chats.
Magai: Operates on its website; offers document modals with persistent chat conversations; additional UI features like hiding prompts and layout changes.

Features:

AI Models: Both offer GPT 3.5 and GPT 4; Magai also includes Claude.
Plans: Magai has quota-based LTD plans; Voilà offers an unlimited plan with FUP.
Team Access: Magai supports multi-user conversations; Voilà focuses on personal productivity.
Browser Integration: Voilà captures highlighted text in-browser (Chromium browsers only); Magai operates on its website.
Dark Mode: Both platforms support manual dark mode selection.
Chat History: Voilà stores history per browser (not editable); Magai offers comprehensive chat organization with folders.
Sharing: Magai allows folder sharing within teams, but without compartmentation; Voilà does not offer sharing features.
Saved Prompts: Both platforms offer saved prompts; Magai has additional "Custom Persona" for switching focus within a conversation.
Formatting: Both support markdowns and bold formatting. Magai is better with support for tables.
Real-time URL Fetching: Magai enables users to leverage content from other websites.