// Free tools
Free tools.
Small, useful pieces of interview prep you can use right now: no account, no email. When you want to practise out loud against an interviewer that pushes back, that’s what Hardmode is for.
// 01 · The tools
Pick one
System design capacity estimator
QPS, storage, bandwidth, and cache size from a few numbers, with the arithmetic shown so you can talk it through.
Coming soonInterview plan from a job posting
Paste a job posting and see the rounds likely in the loop and what each one probes. Inferred from the posting.
Coming soonBehavioural story builder
Turn rough notes into a STAR story, with details worth adding and the follow-ups an interviewer is likely to ask.
Coming soonOffer negotiation drafter
An email, a call outline, and replies to the usual recruiter lines, drafted from your offer and what matters to you.
Coming soonQuestions to ask your interviewer
Questions to ask a recruiter, hiring manager, peer, or skip-level, with what to listen for in each answer.
Coming soon
// 02 · How they work
What free means here
01
No account
Use any tool without signing up: 3 runs a day per tool. The capacity estimator runs in your browser, with no limit.
02
Nothing kept
Results stay on the page and aren’t saved. What you type is sent to third-party AI model providers to produce the result, and we don’t keep it.
03
No email wall
Every result is yours without an email. Signing up is one click with Google, for 20 runs a day and 20 free credits.
The details are in the privacy policy.
// 03 · Player 1
Get ready for hard mode.
Paste the job you want. Run the loop until the real one feels like a rematch.
20 free credits · No card required