See the GPT in action
Two AI-powered GPTs inside ChatGPT. Free to use. Built for serious practice.
Choose your practice mode
Two GPTs, two different use cases — both built to make your prep faster and more practical.
Business Case GPT
Build case-solving skills through practiceUse this GPT to practice full business cases or generate new case prompts tailored to your preparation needs.
- Run a realistic business case interview simulation with structured prompts, interviewer-style follow-ups, and logic challenges
- Generate a new business case tailored to your topic, industry, and difficulty
Market Sizing GPT
Practice sizing questions with guided logicUse this GPT to practice market sizing questions or generate new sizing prompts tailored to your preparation needs.
- Run a realistic market sizing interview simulation with structured prompts, interviewer-style follow-ups, and logic challenges
- Generate a new market sizing question tailored to your topic, industry, and difficulty
- Solve a market sizing question step by step and compare your structure, assumptions, and final estimate
Examples of business cases
Examples of market sizing
Practice smarter in 3 simple steps
Go from setup to feedback in minutes. Built to help you think like an interviewer.
Open the right GPT
Choose Business Case or Market Sizing. The GPT opens directly in ChatGPT - no setup needed.
Choose your mode
Practice live, generate a new case, or ask for a full solution when available.
* Market Sizing GPT only
Practice and improve
Think out loud, follow interviewer-style prompts, and use the feedback to fix weak spots.
Everything you need to get interview-ready
Realistic interview simulation
Interviewer-style GPTs push your logic, challenge assumptions, and keep the pressure on.
Practice out loud with dictation
Tap the mic to turn speech into text. For best results, do not use Voice Mode.
Customize your practice
Pick difficulty, industry, case type, language, and even the length of the case.
Detailed, structured feedback
Get clear, actionable feedback on structure, MECE, math, insights, and communication.
Full step-by-step solutions
See complete solutions with frameworks, calculations, exhibits, and key takeaways.
Generate unlimited new cases
Never run out of practice. Create new cases for solo practice or with friends.
Helped me go from overthinking everything to solving cases with confidence.
Learn from your feedback.
Go deeper with the guides.
Use the theory guides to strengthen weak areas and return to practice with a clearer method.
Business Case Guide
Master core frameworks, logical structuring, and the most common case types.
Market Sizing Guide
Build confidence in demand-driven, supply-driven, and process-based sizing.