Grammarly vs Castmagic
Side-by-side comparison of Grammarly and Castmagic.
AI writing assistant for grammar, tone, and clarity
Turns audio and video into ready-to-publish content
What they are
Grammarly
Grammarly is the most widely adopted AI writing assistant, with over 40 million daily users, offering real-time grammar, spelling, clarity, and tone suggestions across browsers, Word, Google Docs, email, and more. It polishes writing without copy-pasting. Its paraphrasing and generation features are secondary to its core grammar and clarity strengths.
Castmagic
Castmagic ingests podcast episodes, video recordings, and audio files, then uses AI to produce transcripts, show notes, social posts, newsletters, and more from a single upload. Podcasters, course creators, and video producers use it to repurpose long-form content without manual editing. It covers the full repurposing workflow in one place, though the output still benefits from a human edit before publishing.
if you need ai writing. Starts at 12/mo.
if you need transcription and ai writing. Starts at 21/mo.
- +Handles transcription and content generation in a single workflow
- +Supports multiple output types: show notes, social captions, newsletters, timestamps
- +Custom AI prompts let you tailor outputs to your own tone and format
Which to choose
Grammarly and Castmagic both cover ai writing, so this is a real either-or for some teams. The right pick depends on which one's wider feature set and pricing fit how you work.
Read the full reviews for Grammarly and Castmagic.
Pricing checked 5 Jun 2026.