A LockedIn AI alternative for system design interviews

We make System Design LLM. LockedIn AI details come from its pricing page on Nov 14, 2026. The page showed "Loading prices" and no dollar amounts in both a plain fetch and a full browser render, so we describe its plan structure only. LockedIn AI is a trademark of its owner; this page isn't affiliated with or endorsed by it.

Side by side (as of Nov 14, 2026)

When LockedIn AI may suit you better

• You want one product across many interview formats, including phone and mobile.
• You want built-in mock interviews.
• You prefer usage-included pricing and don't want to manage an API key.

When System Design LLM may suit you better

• System design is the round that worries you, and you want depth there rather than breadth across formats.
• You don't want to count minutes: there's no meter, just your own API usage, which for interview-length prompts is typically a few dollars a month even with heavy practice.
• You don't want a subscription billed every three months.
• You want to choose your model and switch whenever a better one ships.
• Need coding rounds covered too? Our sister app Interview LLM handles those, and there's a bundle.

Compare on your own timeline

Because LockedIn AI's prices weren't visible to us, we can't compute a cost comparison. To compare: take the quarterly price for the plan you'd need, divide by your expected search length, and compare with $39 plus an API estimate from our pricing guide.

A note on interview rules

Many employers prohibit outside assistance during live interviews. 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)

• LockedIn AI pricing and FAQ: lockedinai.com/pricing