---
title: "D426 Mastery - Reviews, Revenue and Downloads in Panama | Apple App Store"
description: "Stop stressing about D426. Start mastering it.  D426 Mastery is the #1 study app built specifically for WGU students preparing for the D426 Data Management Foundations Objective Assessment. Every flas"
---

# D426 Mastery — Panama

![D426 Mastery App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/0a/16/c3/0a16c32c-afc9-a702-3b82-0698fd0ffa8c/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png)

**Developer:** [JOHN TIMOTHY DISALLE](https://apptail.io/developer/john-timothy-disalle-rqaRac)
**Category:** Education
**Rating:** N/A (0 ratings)
**Price:** Free
**Bundle ID:** com.ellasid.D426-Mastery
**Store:** Apple App Store
**Country:** Panama
**Version:** 1.0 (released 2026-04-08)
**Original Release:** 2026-04-08
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/pa/app/app/id6761743682)
**AppTail Page:** [https://apptail.io/app/d426-mastery-tBNz/panama](https://apptail.io/app/d426-mastery-tBNz/panama)

## D426 Mastery Description
Stop stressing about D426. Start mastering it.

D426 Mastery is the #1 study app built specifically for WGU students preparing for the D426 Data Management Foundations Objective Assessment. Every flashcard, every quiz question, and every sample database is designed to help you pass your OA with confidence.

SPACED REPETITION FLASHCARDS
- 400+ flashcards covering every D426 competency
- Anki-style SM-2 algorithm that adapts to your knowledge
- Cards you struggle with show up more often -- cards you know fade away
- Search, browse, and filter by topic

MOCK OA EXAMS
- 200+ exam-style multiple choice questions
- Randomized answer positions so you actually learn, not memorize patterns
- Review every missed question with the correct answer and detailed explanation
- Topic-based quizzes to target your weak areas

REAL SQL PLAYGROUND
- Write and execute actual SQL queries -- not just theory
- 5 realistic sample databases: University, Sales, Hospital, Employee, Inventory
- Syntax highlighting, formatted result tables, and query history
- Practice DDL and DML commands against real data

INTERACTIVE ER DIAGRAM BUILDER
- Drag-and-drop entities, attributes, and relationships
- Crow's Foot notation with cardinality validation
- Build and visualize database designs hands-on

COMPLETE TOPIC COVERAGE
- Relational Model Concepts
- ER Diagrams and Crow's Foot Notation
- Primary Keys and Foreign Keys
- Database Normalization (1NF, 2NF, 3NF, BCNF)
- SQL DDL Commands (CREATE, ALTER, DROP)
- SQL DML Commands (SELECT, INSERT, UPDATE, DELETE)
- Conceptual, Logical and Physical Data Models
- DBMS Architecture and ACID Properties

SMART PROGRESS TRACKING
- Mastery percentage for every topic
- Radar chart showing your strengths and weak spots
- OA Readiness score -- know exactly when you're ready to test
- Study streak counter and daily session timer
- Detailed statistics: cards reviewed, quizzes taken, accuracy rate

SEARCHABLE GLOSSARY
- 90+ database terms with clear definitions
- Organized by category for quick reference
- Perfect for last-minute review before your OA

FREE VS PREMIUM

Free includes:
- 50 flashcards with full spaced repetition
- 1 mock OA exam per day
- 1 sample SQL database
- Complete glossary
- Basic study statistics

Premium unlocks:
- All 400+ flashcards
- Unlimited mock OA exams
- All 5 SQL databases
- Missed questions review after every quiz
- OA Readiness score
- Interactive ER Diagram Builder
- Advanced analytics

Premium is available as a monthly subscription ($7.99/month, auto-renewing) or a one-time lifetime purchase ($24.99). Monthly subscriptions automatically renew unless canceled at least 24 hours before the end of the current billing period. Manage or cancel anytime in your Apple ID account settings.

WORKS 100% OFFLINE
No internet required. No account needed. No data leaves your device. Study anywhere -- on the bus, in bed, between classes.

BUILT BY WGU STUDENTS, FOR WGU STUDENTS
We know the D426 OA because we've been there. Every flashcard and quiz question is mapped to actual course competencies so you study what matters.

D426 Mastery is an independent study aid and is not affiliated with, endorsed by, or sponsored by Western Governors University.

Support: 
Terms of Service: 
Privacy Policy: 

## D426 Mastery Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/79/6d/8e/796d8e69-6f2e-3fed-f026-820db54ed65a/1.png/1284x2778.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/6b/ca/da/6bcadab1-3492-cb4e-902b-6e96de70f701/2.png/1284x2778.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/0a/d3/aa/0ad3aa56-c62e-ac03-f0d2-f350e5053d16/3.png/1284x2778.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/5a/ef/c5/5aefc501-fda1-bf10-9453-60ca729ba3c7/4.png/1284x2778.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/24/34/4e/24344e32-887e-6ff9-82f6-d6331337de5a/5.png/1284x2778.png)



## D426 Mastery In-App Purchases
| Item | Price |
|------|-------|
| Monthly Premium | USD 7.99 |
| Lifetime Access | USD 24.99 |




## D426 Mastery Available In
- [United Arab Emirates](https://apptail.io/app/d426-mastery-tBNz/united-arab-emirates)
- [Armenia](https://apptail.io/app/d426-mastery-tBNz/armenia)
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---

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