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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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Grammarly
A
Suno
S
Perplexity
S
Runway
S
TaglineGrammar check + tone + AI drafting, everywhere you type.Prompt to full song with vocals, instruments, the works.AI search done right. Cited answers, not chat theater.The pro's AI video tool. Gen-4 is the current bar.
CategoryWritingAudioResearchVideo
PricingFree + $12-$15/mo Premium + team plansFree + $10/mo + $30/moFree + $20/mo ProFree + $15-$95/mo
Best forNon-native English writers, business email, anyone who types a lot.Jingles, intros, demos, sketches, personal use.Replacing Google for any question where you want a cited answer in seconds.Marketing video, pitch decks, b-roll, creative shorts.
Strengths
  • Works in every browser/app
  • Now has generative AI (GrammarlyGO)
  • Tone detection + suggestions
  • Real songs with real lyrics
  • v4 is very good
  • Quick turnaround
  • Sources every claim
  • Fast, current answers
  • Pro Search runs multi-step research
  • Spaces for persistent context
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
Weaknesses
  • Can feel naggy
  • Premium features gate basics
  • Privacy concerns (reads your writing)
  • Copyright gray zone
  • Audio quality behind studio
  • Not a general chatbot
  • Answers can be shallow on complex topics
  • Expensive at scale
  • Still needs post-editing
Kai's verdictA-tier for non-native English speakers. B-tier if your English is already strong — Claude does better with tone.S-tier in its category. The first AI music tool I'd actually listen to.S-tier for search. I use it before Google now. If you're still Googling everything, try this for a week.S-tier. Market leader with reason. Start here for serious video.
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