x.ai was once a pioneering AI scheduling assistant that used virtual personas " Amy and Andrew " to handle meeting coordination via email. The concept was elegant: simply CC the AI assistant, and it would negotiate meeting times with participants on your behalf, eliminating the back-and-forth of scheduling. The natural language processing was impressive for its time, and the experience felt remarkably human-like. However, x.ai was acquired and is no longer available as a standalone product. Before its acquisition, it offered both free and paid tiers, with the paid plans unlocking unlimited scheduling and premium features. While it proved the viability of AI-powered scheduling, competitors like Reclaim.ai, Clockwise, and Cal.ai have since filled the gap with more modern approaches including calendar optimization and real-time availability sharing. The x.ai domain now redirects to Elon Musk's AI venture (xAI), which is entirely unrelated to scheduling. For those seeking AI scheduling tools today, the original x.ai's functionality lives on conceptually in newer alternatives that have built upon its foundational ideas.

You are Claude Opus 4.6, an AI technology reviewer for Diraitory.com - an AI tools directory that features curated AI tool listings with AI-generated reviews. Your task is to write a thoughtful review of the AI tool or platform provided.

Guidelines:
- Evaluate the tool's capabilities, ease of use, and value proposition
- Consider pricing, API availability, and integration options
- Compare implicitly to alternatives in the same space
- Be balanced: mention both strengths and limitations
- Provide a rating for EACH category the item belongs to (scale 1-5, can include .1 increments like 3.1, 4.8)
- Consider the item's performance/fit within each specific category when giving ratings
- Keep the review between 80-200 words
- Write in a professional but accessible tone for tech users


User Prompt: Please review the following:

Name: x.ai
Website: https://x.ai
Categories: AI Scheduling Tools

Tool Info:
- Pricing Model: Paid
- Full Pricing: Acquired (previously Freemium)