Built by former McKinsey consultants.
Case interview practice for anyone getting into consulting
Practise the case interview out loud, before it counts.
A live interviewer runs a real consulting case with you by voice. It hands over data only when you ask, pushes back, and expects a recommendation. Twenty minutes later, a report shows exactly where you can improve.
No card neededUnlimited use for $10 a monthRuns in your browser
190+
undergrad and MBA cases to practise
6
case types, from profitability to guesstimates
20 min
for a full case, start to recommendation
1 report
after every case, scored by skill
How it works
Three steps, about twenty minutes a case.
01
Pick a case
Profitability, market entry, pricing, growth, guesstimates and more. New to cases? The beginner path tells you where to start.
02
Talk it through
Speak your structure, ask for the figures you need and do the maths out loud, with an interviewer who pushes back.
03
Read your report
A score out of 100, a band for each skill, and what to work on next, tied to the moment you said it.
The report
Feedback that quotes what you said.
Every case ends with a report that scores each skill the case tested and shows where you can improve, with the line you said and the minute you said it. So the next case is better than the last.
- Four skills: structuring, numbers, judgement and recommendation, communicating
- Progress across every case, and the next case picked for you
- Practice mode with hints when you are learning, interview mode when you are ready
Example report · Coffee chain profitability
72/100
- Structuring the problem◐ Developing
- Working the numbers● Strong
- Judgement and recommendation◐ Developing
- Communicating clearly● Strong
Where you can improve
You went to costs before checking whether revenue had fallen. Next time, split profit into revenue and cost and ask which one moved before choosing a branch.
“Let’s start with their cost structure, I think that’s where the leak is.”
You said this at 03:42
Everything included
From your first framework to your final round.
Live voice interviews
Speak your answers, like the real thing. Type when you can’t talk.
Cases picked for you
Recommendations aim at the skills you want to grow most.
A beginner path
Short readings and cases in order, for your first few weeks.
Maths drills
Quick rounds of the sums real cases ask for.
Frameworks and a glossary
How to approach each kind of case, open during a case too.
Resume review
Your CV checked against twelve rules for consulting placements.
How it compares
Do your reps here. Save paid mocks for the final polish.
| Northstar | Paid mock | Practice partner | Casebook alone | |
|---|---|---|---|---|
| Cost | $10 a month | About ₹5,000 a session | Free | Free |
| Ready at 1 a.m. | Yes | By booking | Rarely | Yes |
| Spoken, like the interview | Yes | Yes | Yes | No |
| A score for each skill | Yes | Sometimes | No | No |
| As many cases as you like | Yes | No | No | Yes |
Pricing
One plan. Less than one paid mock.
Unlimited use of every case and every tool for $10 a month, about $0.33 a day. Sign up free to start with the Profitability checkpoint and one case of your choice.
Northstar Unlimited
Unlimited use$10a month
- Every case, as many times as you like
- Live voice interviews and a report after each
- Beginner path, maths drills, frameworks and resume review
No card needed to start
FAQ
Frequently asked questions
Can I start for free?
Yes. A free account opens the Profitability checkpoint of the beginner path, one reading and four cases, plus any one other case you choose. No card is needed. Unlimited use of every case and every tool is $10 a month.
What does $10 a month include?
Unlimited use: every case as many times as you like, live voice interviews, a report after each, and the beginner path, maths drills, frameworks and resume review. About $0.33 a day, less than a single paid mock.
Who built Northstar?
Built by former McKinsey consultants, with input from consultants at BCG and Bain. Material developed with candidates and interviewers from IIT Madras, IIT Bombay, IIT Delhi, IIM Ahmedabad, IIM Bangalore and IIM Calcutta.
Who is the interviewer?
An AI interviewer that runs the case the way a consultant would: it reads you the prompt, releases figures and exhibits only when you ask the right question, nudges when you drift, and expects a recommendation at the end.
Do I have to speak?
Voice is the default, because the real interview is spoken. You can type when you can’t talk.
What do I need?
A browser and a microphone. Headphones and a quiet room give the best results, and a pen and paper help with the maths. The lobby checks your mic before every case.
I’ve never done a case. Where do I start?
With the beginner path. It teaches one idea at a time with short readings, then gives you cases in practice mode, with hints whenever you ask, before your first full interview.
Which kinds of cases are there?
Profitability, market entry, pricing, growth strategy, guesstimates and unconventional cases, written for undergraduate and MBA placements, many of them set in India.
What is in the report?
A score out of 100, a band for each skill the case tested, and where you can improve, each point tied to what you said and when. Your progress page tracks every skill across cases.
Does this replace practising with people?
It covers the volume. Most candidates need dozens of cases, and paid mocks at about ₹5,000 each add up fast. Do your reps here, then spend on one or two sessions with a consultant for the final polish.
Your first case is twenty minutes away.
Sign up free, pick a case and start talking. Your report is waiting at the end.
Sign up freeNo card needed