Case Interview Labs
AI mock case interviews · calibrated firm by firm

Know exactly what's coming before you walk in.

Anyone can ask an AI to act like a case interviewer. Knowing what one actually does took 20+ years industry experience, 8+ years coaching candidates and 2,000+ after-interview debriefs.

Make no mistake: this is not one interviewer with eleven settings. Each firm was built on its own — its pushback, its pace, what it rewards and what it won't forgive.

11
firms, built separately
50,000+
words of rules and process
924
real case combinations

One free half-length case · No card details needed

Firm
McKinsey & CompanyMcKinsey
& Company
Topic
Public SectorFinancial ServicesHealthcare
Level
Co-opAnalystAssociateManagerPartner
Case type
Situational logicReal-world judgment and leadership
GrowthHow can the client grow revenue?
Market sizingEstimate a market from first principles
Market entryShould the client enter a new market?
ProfitabilityDiagnose why profits are declining
M&A / due diligenceShould the client acquire the target?
Sign up and start your free case

Pick one firm, one topic, one level, one case type.

Train against the firm you're actually facing

Our one-of-a-kind toolkit

A working toolkit, not just a chat box.

Everywhere else you talk your thinking into a text box. Here you build it — with the two tools you'd actually reach for in the room. No other AI interviewer has either.

Dr CAi
The Structure Tool

Case interviewing demands the use of frameworks — so instead of scribbling one on paper, you build it straight into the system: up to five MECE buckets, titled and filled as the case unfolds. Then Dr CAi pushes back like a real interviewer — no grades, no do-overs, you defend it and move.

You
Give me a moment to lay it out.
Dr CAi
Take your time.
Bucket 1 Bucket 2 Bucket 3
+ Add bucket Max 5 buckets
Submit structure →
The Market Sizing Tool

Build your market sizing straight into the tool, factor by factor from a single starting number. Split into separate pathways when your thinking needs it, or stay on a single line — it works whether you're going bottom-up or top-down. Every factor carries its own assumption, stated openly, so the logic behind each number is visible rather than buried in your head.

A clean, segmented sizing is the difference between a number and an answer you can defend.

UK gym members
Estimated figure
7.5 million
2 Annual spend per member Split
Assumption
£45 a month, blended
Calculation
£4.0bn
Share of members
Annual fee
+ Add
Share of members
Annual fee
+ Add
Add segment
My estimate ≈ £4.0bn a year
+ Add a factor 1 factor
Submit approach →
True to each firm

Eleven firms. Eleven temperaments.

Each firm is researched and calibrated individually — its format, its warmth, its signature probes, what it actually rewards. Not one interviewer wearing eleven name badges.

McKinsey & Company

Interviewer-led

Cold, clipped, relentless. Controls the case, drills your exhaustiveness, and never lets a vague answer pass.

"What else?"

Bain & Company

Interviewer-led

Warm in the room, commercial to the core. Builds rapport — then wants the "so what" for the client, every time.

"And what does that mean for the client?"

Oliver Wyman

Candidate-led

Direct and exacting, rooted in financial services. You drive the case — and the numbers had better be precise.

"Walk me through that calculation again."

Plus BCG, Accenture, Deloitte, EY-Parthenon, KPMG, Kearney, PwC Strategy& and Portas —
each with its own interview format, tone, and scoring emphasis.

How it's hyper-realistic

We have the inside track.

Most AI interviewers learn from public case books. Dr CAi is built from eight years coaching candidates into these firms — and 2,000+ debriefs taken as they walked out of the real thing.

8years

Coaches and interviewers

Coaching candidates into McKinsey, BCG, Oliver Wyman and more — and training interviewers to run the other side.

2,000+

Real debriefs

Captured after each real interview — the format, the tone, how hard they pushed, what they were really testing for.

Fed into every interview

We used to pass one candidate's debrief forward by hand. Dr CAi does it at scale — each firm behaves like the real one, not a bot in a name badge.

Five levels, five bars

The bar moves. So do we.

A Partner case is not an Analyst case with bigger numbers. Different ambiguity, different register, and a different answer required to clear the bar. We don't change the numbers. We change the interviewer.

Choose the difficulty level

Co-op
Analyst
Associate
Manager
Partner

You are judged against the bar for the level you picked — not a generic one.

The debrief

A verdict, not a pat on the back.

Most AI tools praise everything you say. Dr CAi scores you the way the firm would — and tells you where you'd actually have landed.

  • Four dimensions, firm-weighted. Structure, analytics, insight, and communication — scored through your firm's emphasis at your chosen level.
  • No invented praise. If you barely engaged, your debrief says so. Honest beats comfortable.
  • Take your debrief with you. One-click PDF to keep, and your five most recent interviews stay saved — transcript and all — in your history.

Your debrief

↓ Download PDF

Against McKinsey's bar at Associate level: a likely second-round callback, not a clear offer.Solid

Structure4/5
Analytics3/5
Insight3/5
Communication3/5

Work on

You presented the framework, then waited — at McKinsey, drive to the next question before being asked.

1 hint used
How it works

Watch a real case, start to verdict.

Case Interview Labs

Configure your case interview below, then click start when you're ready

1Choose your target firm

McKinsey & Company
Problem solving, structured thinking
BCG
Creative, hypothesis-led approach
Bain
Interviewer-led, commercial instinct
Deloitte
Structured, data-driven analysis
PwC Strategy&
Practical, client-focused approach
EY-Parthenon
Sector expertise, analytical rigour
KPMG
Risk-aware, structured frameworks
Oliver Wyman
Quantitative, financial focus
Kearney
Operations-focused, pragmatic
Accenture Strategy
Technology-aware, transformation
Portas Consulting
Sports industry specialist

2Choose the case topic

Public Sector
Financial Services
Healthcare

3Choose the difficulty level

Co-op
Analyst
Associate
Manager
Partner

4Choose the case type

Situational logic
Real-world judgment and leadership
Growth
How can the client grow revenue?
Market sizing
Estimate a market from first principles
Market entry
Should the client enter a new market?
Profitability
Diagnose why profits are declining
M&A / due diligence
Should the client acquire the target?
Your Case03:41
McKinsey & CompanyMarket entryHealthcareAssociate
Brief
Structure
Analyse
Conclude
Dr CAi
Your client is Meridian Health, a German private-hospital group. The board is weighing entry into the UK market and wants a recommendation — enter or not, and if so, how. Take a moment, then walk me through how you'd approach it.
You
I'd look at three things: how attractive the UK market actually is, whether Meridian has a right to win there, and what entry would cost — building versus acquiring an operator.
Dr CAi
Reasonable instincts. Before we go anywhere — lay it out properly. Use the structure tool and show me the full framework.
Your Case05:12
McKinsey & CompanyMarket entryHealthcareAssociate
Brief
Structure
Analyse
Conclude
Dr CAi
Reasonable instincts. Before we go anywhere — lay it out properly. Use the structure tool and show me the full framework.
You
Give me a moment to lay it out.
Dr CAi
Take your time.
Your framework1 of 5
1
1Market attractiveness
1Market attractiveness
Size and growth of UK private care. Payor mix — PMI insurers vs self-pay. Competitive intensity and capacity gaps.
Click to edit
2
2Right to win
2Right to win
Meridian's clinical model vs incumbents. Brand, consultant and referral networks. Regulatory readiness — CQC.
Click to edit
3
3Entry economics
3Entry economics
Build vs acquire vs partner. Capex, price points, payback period. Staffing and NHS-dependence risks.
Click to edit
Add
Case Interview Labs

Interview debrief

0/5
Overall
Strong
Against McKinsey's bar at Associate level: a likely second-round callback for Mohammed — not yet a clear offer.
Scorecard
What you did well
You named the three questions that decide an entry case — market attractiveness, right to win, entry economics — before Dr CAi asked for them. That first structured answer is what kept the interview moving at McKinsey pace.
You tailored the buckets to Meridian specifically — payor mix and capacity gaps under attractiveness, CQC readiness under right to win — rather than reciting a generic entry checklist. That specificity is what separates a strong Associate answer.
What to work on
You laid the three buckets out evenly, but never signalled which one actually decides the case. At McKinsey, say it up front — "entry hinges on right to win, so I'd start there" — and drive the interview toward the crux.
Right to win stayed a list — brand, consultant networks, CQC readiness. Rank them: name the one that actually wins share from incumbents, and say why.
Practise before your next case
Rehearse two-minute market sizings that end in a decision-ready number — population, penetration, usage, value — and say the "so what" out loud as the final line, not just the figure.
Take three market-entry prompts this week and open each with a one-sentence hypothesis — enter or don't — then build the framework that tests it. Answer-first is a habit built in practice, not in the room.
Overview

Mohammed opened with the right three questions for a market-entry case and tailored each to Meridian rather than reaching for a template — a genuinely strong start. Where Mohammed lost ground was commitment: the framework mapped the space cleanly but never led with a hypothesis or said which bucket actually decides the case. At Associate, that judgment — knowing where to drive — is the difference between a callback and an offer.

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Your first case is on us — no card, no commitment. Feel the pushback, then decide.

Freehalf-length case

Hear a real brief, build your framework live in the Structure Tool, and hold up under Dr CAi's pushback — calibrated to the firm you're actually facing.

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FAQ

Quick answers.

How is this different from prompting ChatGPT to run a case?

General models praise a weak framework as warmly as a strong one, and they don't know how McKinsey differs from Kearney. Case Interview Labs runs a firm-calibrated interview engine: each firm's format, tone, and scoring emphasis is individually researched, your framework is built live in the Structure Tool, and your score is judged against that firm's bar at your chosen level — honestly.

Do I speak or type?

Both. Dr CAi speaks every turn out loud; you can answer by voice or keyboard, whichever feels closer to your real interview.

What exactly do I get in the free taster?

A half-length case: you hear the full brief, build and present your framework, and get Dr CAi's genuine reaction to it. One taster per account — after that, interviews use credits.

Why is the taster case only half a case?

The taster is half a case, one per account, for two reasons — it keeps the free offer sustainable, and it stops people gaming it with repeat sign-ups. You still get the real thing: the full brief, your framework built live, and Dr CAi reacting to your thinking as you go. After the taster, interviews run on credits.

Do my credits expire?

Pay-as-you-go credits never expire. Pro Monthly includes 10 interviews each month, resetting on your billing date.

Which levels can I practise at?

Five: Co-op, Analyst, Associate, Manager, and Partner. Each level changes the case's complexity, ambiguity, and the strictness of the bar you're judged against.

Your next interviewer has a temperament. Meet it before the real thing.

One free half-length case. No card details needed.

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