Written lessons
Every concept explained in prose you can actually read — not bullet fragments scraped from a slide.
Cloud and data certifications
Prepstellar
Everyone else sells you a question bank. We're building the whole academy: written lessons, narrated audio, an AI tutor, spaced review and mock exams — for cloud and data certifications.
- 16Courses
- 586Lessons
- 5,860Practice questions
The difference
An academy, not a question bank
Most cert prep hands you a pile of questions and wishes you luck. You memorize answers, pass or fail, and forget it a week later. We think that's backwards.
A question bank
- Endless dumps, no explanation of why
- You memorize answers, not concepts
- No path — just shuffle and repeat
- Silently stale when the exam changes
- Nobody to ask when you're stuck
An academy
- A written lesson for every concept, narrated too
- A tutor to ask when you're stuck
- Review that comes back when you'd forget
- Mock exams weighted by domain, like the real one
- Game modes, and people doing the same exam
What's inside
Everything a course should have
A question bank is one of these seven. We're building the other six too, because that's what it takes to actually learn the material.
Narrated audio
The whole syllabus, read aloud like a podcast. Study on the commute, at the gym, doing the dishes.
AI tutor
Stuck at 11pm? Ask. It knows the concept you're on and answers within your course, not in general.
Tests & mock exams
Practice per concept, then full mock exams — weighted by domain like the real thing.
Spaced review
What you got wrong comes back — exactly when you're about to forget it, not before.
Game modes
Fast rounds that turn revision into something you'd actually open on a Tuesday night.
Community
Ask on the exact concept that tripped you up, and see what tripped up everyone else. Moderated.
Under the hood
And all of it stays true
An academy is only worth it if the material is right. So everything here traces back to the vendor's own study guide — the current version, not a forum thread or someone's memory of last year's exam.
When a vendor changes a guide, we see it and rewrite what moved. It's not the reason to choose us. It's the reason the rest holds up.
The catalog
Sixteen courses, one academy
Cloud and data, across every major vendor — plus the tech skills underneath them. The first lessons of each course are free to read right here, no app and no account.
AWS · AIF-C01
AWS Certified AI Practitioner
Foundational AI and generative AI concepts, responsible AI, and AWS AI services.
53 lessons
AWS · SAA-C03
AWS Certified Solutions Architect – Associate
Designing secure, resilient, high-performing, and cost-optimized architectures on AWS.
47 lessons
Data
Data Analysis Fundamentals
Loading, cleaning, transforming, and visualizing data for exploratory analysis.
31 lessons
Data
Data Engineering Fundamentals
Distributed processing, Spark SQL, streaming, and workflow orchestration.
27 lessons
Databricks · DEA-C01
Databricks Certified Data Engineer Associate
Building and governing data pipelines on the Databricks Lakehouse Platform.
37 lessons
Microsoft · DP-750
Implementing Data Engineering Solutions Using Microsoft Azure Databricks
Configuring Azure Databricks, governing Unity Catalog, and building data pipelines.
59 lessons
Microsoft · AZ-104
Microsoft Azure Administrator
Identity, storage, compute, networking, and monitoring for a production Azure environment.
39 lessons
Microsoft · DP-900
Microsoft Azure Data Fundamentals
Core data concepts, relational and non-relational data, and analytics workloads on Azure.
23 lessons
Microsoft · AZ-900
Microsoft Azure Fundamentals
Cloud concepts, Azure services, and how the platform is governed.
26 lessons
Microsoft · DP-600
Microsoft Fabric Analytics Engineer Associate
Preparing data, securing analytics solutions, and building semantic models in Microsoft Fabric.
40 lessons
Microsoft · DP-700
Microsoft Fabric Data Engineer Associate
Ingesting, transforming, securing, and monitoring analytics solutions in Microsoft Fabric.
47 lessons
Microsoft · PL-300
Microsoft Power BI Data Analyst Associate
Preparing, modeling, visualizing, and securing data with Power BI.
44 lessons
Microsoft · PL-900
Microsoft Power Platform Fundamentals
Power Apps, Power Automate, Copilot Studio, and Dataverse across the Power Platform.
20 lessons
Python
Python Fundamentals
Core syntax, data structures, object-oriented Python, and testing.
42 lessons
SQL
SQL Fundamentals
From foundational queries to transactions, indexes, and query plans in PostgreSQL.
37 lessons
Snowflake · COF-C03
SnowPro Core Certification
Snowflake architecture, account management, data loading, and performance optimization.
14 lessons
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The whole course, on your phone
Lessons you can read, audio you can listen to on the way to work, and practice that remembers what you got wrong.