Comparison
A Cluely alternative built for system design interviews
Cluely is a general-purpose AI assistant for meetings, calls and studying, sold as a monthly subscription. System Design LLM is narrower: it only does system design answers, for a one-time price with your own AI key. If system design rounds are your main concern, here's how they compare.
We make System Design LLM. Cluely details come from its pricing page on Nov 14, 2026. Cluely is a trademark of its owner; this page isn't affiliated with or endorsed by it.
Side by side (as of Nov 14, 2026)
| Cluely | System Design LLM | |
|---|---|---|
| Built for | General use: meetings, homework, sales calls | System design interviews only |
| Price | Starter free (limited); Pro $19.99/month; Pro + Undetectability $149.99/month; annual billing available ("Pro from $11.99/mo") | $39 one-time |
| AI usage | Included ("latest AI models") | Your own OpenAI, Claude or Gemini API key |
| Model choice | Not specified on pricing page | You choose the provider and model |
| Platforms (per pricing page) | Mac desktop app; mobile app | Windows and macOS |
| System design structure | Not a stated feature | Requirements, estimates, architecture, trade-offs, follow-ups for every prompt |
When Cluely may suit you better
- You want one assistant for meetings, calls and study, not just interviews.
- You want a free tier to try before paying.
- You'd rather not set up an API key.
- You want a mobile app.
When System Design LLM may suit you better
- Your goal is system design rounds, and you want answers shaped the way interviewers grade them: scoped requirements, estimates, a data model, trade-offs, and likely follow-ups.
- You want to choose the model yourself and switch as better ones ship.
- You'd rather pay once. At list prices, three months of Cluely Pro billed monthly is about $60; System Design LLM is $39 plus a few dollars of API usage. Details in AI interview assistant pricing.
- You're on Windows (Cluely's pricing page only links a Mac download).
Try the method first
Whichever tool you use, the structure matters more than the software. Our free 45-minute system design framework and worked guides like design a URL shortener show the shape of a strong answer.
A note on interview rules
Many employers prohibit outside assistance during live interviews, and some interview platforms check for it. Use any assistant in line with the rules you've agreed to; practice and mock interviews are the safe default.
Sources (checked Nov 14, 2026)
- Cluely pricing: cluely.com/pricing
FAQ
Is Cluely made for interviews?
Its pricing page describes use for meetings, homework and sales calls, and doesn't mention interviews or system design specifically. It's a general assistant rather than an interview-specific tool.
How much does Cluely cost?
On Nov 14, 2026, its pricing page listed a free Starter plan with limited AI responses, Pro at $19.99/month, and Pro + Undetectability at $149.99/month, with a monthly/annual toggle. The page title advertised Pro "from $11.99/mo", which appears to be the annual rate.
Which models does System Design LLM use?
Whichever you choose: you bring your own OpenAI, Anthropic (Claude) or Google (Gemini) API key and select the model in the app.