Case Study: CasperPrep App
Medical exams prepratioon app with AI
From Concept to $20K: The SaaS Journey of CasperPrep with Skywinds
About the Client
A Canadian startup in the edtech space came to Skywinds Solutions with a clear goal: help aspiring medical students get into top schools by preparing them for CASPer—an essential part of the admissions process. They wanted to build something much better than existing practice methods—an online tool that felt like the real thing, with smart, personalized feedback to help students improve.
The Challenge
Most students preparing for CASPer rely on expensive coaching sessions, either in-person or over Zoom. These sessions can cost upwards of $5,000, and they don’t always offer the hands-on practice or detailed feedback students need. While one competitor used AI in their software, it lacked the depth and flexibility students were looking for.
Here’s what the client wanted to change:
- Make realistic CASPer practice accessible and affordable.
- Provide instant, smart feedback instead of just showing model answers.
- Track student performance with data-driven insights.
- Let students practice at their own pace with tools tailored to the real exam.
Frontend
React.js
Backend
Node.js with PostgreSQL
AI & Feedback
GPT-4 API & Languagetool API
Authentication
Passport.js
Live Link
How Skywinds Helped
We built a complete web platform—CasperPrep App—that gives students everything they need to prepare for CASPer effectively. Here’s what we delivered:
Real CASPer-style Tests
Students can choose the specific qualities they want to focus on (like empathy, communication, or ethics) and get 12 timed scenarios to practice.
AI-Powered Feedback
Using GPT-4, the platform analyzes each answer, scores it on a 0-100 scale, and suggests improvements—all while keeping the student’s original ideas intact.
Typing & Grammar Insights
The platform also tracks typing speed (WPM) and flags grammar/spelling issues using Languagetool.
Interactive Feedback Chat
Paid users get an AI chat for each scenario, where they can ask questions or get more guidance.
Flexible Access
Free users get 2 tests/month with limited feedback. Paid users unlock full reports and unlimited tests.
The Result
Implementation Timeline
| Phase | Timeline | What We Did |
|---|---|---|
| Discovery | Week 1–2 | Planned features, mapped out CASPer scoring qualities, and built wireframes. |
| Backend Development | Week 3–4 | Built APIs with Node.js and PostgreSQL, integrated GPT-4, and setup logic. |
| Frontend Development | Week 5–6 | Created a React.js interface with timers, dashboards, and dynamic screens. |
| Testing & Launch | Week 7–8 | QA, performance tuning, free/paid feature handling, and went live on DigitalOcean. |
Business Impact & Results
30 Days MVP Launched
We delivered a live platform in just under a month.
500+ Paid Users
Students subscribed within the first 4 weeks of launch.
$20,000 Revenue
The client made 4X their initial investment in the first month.
+27% Score Boost
Students improved significantly by following AI feedback.
-65% Support Load
Fewer support queries thanks to helpful feedback and chat.
38% Conversion
Free users upgraded to paid at an impressive rate.
Conclusion
CasperPrep App is a clear example of what happens when thoughtful product strategy meets powerful AI technology. With a focus on accessibility, personalized feedback, and measurable results, the app is already helping hundreds of medical school aspirants boost their performance. More than just a practice tool, it’s become a valuable resource in a competitive admissions process—offering students meaningful insights and building confidence with every scenario.
Skywinds Solutions was proud to lead the full-cycle development, from MVP to launch, and continues to support the platform as it grows. This project highlights our ability to blend AI with custom SaaS development to solve real-world challenges in education.
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