> For the complete documentation index, see [llms.txt](https://manuals.dialox.ai/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://manuals.dialox.ai/store/marketplace-apps/level-3-professional.md).

# Level 3 - Professional

**Level 3 - Professional** Smart Apps are customizable using Flows, and offer access to advanced features like [integrations](/store/skills/integrations.md), [planner](/store/skills/planner.md) capabilities, and [knowledge bases](/studio/ai/knowledge-bases.md).

## Planning & Scheduling Apps

The planner skill allows users to reserve time slots in your calendar. The [Appointment Planner](/store/marketplace-apps/level-3-professional/appointment-planner.md) App uses chat features to schedule specific appointment times sent directly to your calendar. The [Callback Planner](/store/marketplace-apps/level-3-professional/callback-planner.md) App is a phone implementation that lets users choose a window of time in which you will call them back to follow up, leaving a callback note with relevant information.