Never lose quiz progress again—offline access and seamless sync for Coursera students.
Coursera's mobile app crashes during quizzes, preventing students from studying effectively on the go.
QuizHaven lets users export Coursera quiz data via browser and import it into a stable, offline-first PWA that plays quizzes without crashes. Progress auto-syncs across devices when online, ensuring busy students can study on commutes or breaks uninterrupted. It mimics Coursera's quiz format exactly for familiar practice.
Busy students enrolled in online courses on platforms like Coursera who depend on mobile apps for studying during commutes or short breaks.
Patented import parser for Coursera quizzes + infinite auto-save every 2 seconds, preventing any loss from app crashes.
supportive
Parse and import quiz JSON from Coursera browser console.
PWA-based player with full offline support using IndexedDB.
Real-time cloud sync of quiz answers and scores across devices.
Saves progress every 2 seconds locally and to cloud.
Track and review past quiz attempts with analytics.
Group quizzes by Coursera course for easy navigation.
Toggle for low-light studying.
Share quizzes with study buddies.
Generate hints for stuck questions.
Read questions aloud for audio learning.
Badges and streaks for motivation.
| Column | Type | Nullable |
|---|---|---|
| id | uuid | No |
| text | No | |
| created_at | timestamp | No |
| Column | Type | Nullable |
|---|---|---|
| id | uuid | No |
| user_id | uuid | No |
| name | text | No |
| coursera_id | text | Yes |
Relationships:
| Column | Type | Nullable |
|---|---|---|
| id | uuid | No |
| course_id | uuid | No |
| title | text | No |
| questions | jsonb | No |
| imported_at | timestamp | No |
Relationships:
| Column | Type | Nullable |
|---|---|---|
| id | uuid | No |
| user_id | uuid | No |
| quiz_id | uuid | No |
| answers | jsonb | Yes |
| score | int | Yes |
| synced_at | timestamp | No |
Relationships:
/api/quizzes/importImport new quiz JSON
/api/coursesList user courses
/api/quizzes/:idGet quiz details
/api/progress/:quizIdSave progress
/api/progress/:quizIdFetch progress
/api/historyGet score history
/api/coursesCreate new course
No history analytics
| Month | Users | Conversion | MRR | ARR |
|---|---|---|---|---|
| Month 1 | 100 | 2% | $50 | $600 |
| Month 6 | 800 | 4% | $800 | $9,600 |
Study anywhere without app crashes—offline play, auto-sync, zero progress lost.
Post detailed pain-point threads on r/coursera and r/learnprogramming with a free beta invite link; DM top commenters offering personalized onboarding; share MVP video on Coursera Facebook groups targeting crash complaints.
Flashcard focus
No Coursera import or offline quizzes
Coursera-specific offline sync
Spaced repetition
Manual setup, no sync for quizzes
One-click Coursera import
User-locked quiz progress data + course-specific import network effects.
Online course enrollments up 30% YoY, mobile study surging, Coursera app complaints spiking on Reddit.
Coursera changes quiz JSON format
Build flexible parser with user feedback loop
TOS violation on exports
User-initiated exports only, no scraping
Low awareness of import method
Tutorial videos in onboarding
PWA offline bugs
Heavy testing on iOS/Android
Success: 70% confirm issue + 20% interested in beta
Success: 80% retention after 3 quizzes
Success: 5% paid conversion
Other validated startup ideas you might find interesting
Never miss TechCabal articles again—search and recover 404 pages instantly.
Your personal vault for TechCabal links—auto-recovers 404s forever.
AI revives lost TechCabal pages—summarize, rewrite, recover.
Automate real estate agent outreach so solo proptech founders can focus on building.
Centralize proptech operations to eliminate solo founder burnout.
AI no-code builder for proptech MVPs – dev time slashed 80%.