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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Dev Platform
Audio
Research
Agents
Coding
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Image
Video
Voice
Meetings
Design
Productivity
Writing
Data
Marketing
Education
Grammarly
A
Runway
S
NotebookLM
S
Descript
S
TaglineGrammar check + tone + AI drafting, everywhere you type.The pro's AI video tool. Gen-4 is the current bar.Google's research notebook. Turns your docs into a podcast.Edit video + podcasts by editing the transcript.
CategoryWritingVideoResearchVideo
PricingFree + $12-$15/mo Premium + team plansFree + $15-$95/moFreeFree + $16-$50/mo
Best forNon-native English writers, business email, anyone who types a lot.Marketing video, pitch decks, b-roll, creative shorts.Students, researchers, anyone with a stack of PDFs or a topic to learn.Podcasters, course creators, anyone editing talking-head content.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Upload anything, ask questions, get cited answers
  • Audio Overview turns docs into a 10-min podcast
  • Great for studying
  • Edit audio/video by deleting text
  • Overdub (voice clone) for fixes
  • Strong collaboration + remote recording
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Expensive at scale
  • Still needs post-editing
  • Google-only
  • Can be slow on large corpora
  • Not a traditional NLE — some workflows awkward
  • Overdub ethics require care
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier. Market leader with reason. Start here for serious video.S-tier for study. The Audio Overview is a killer feature. Try it with three of your favorite PDFs.S-tier for content creators. Cuts editing time in half. Non-obvious but life-changing.
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