Prepstellar
Get it on Google Play

Prepstellar

Launch your tech career

Cloud, data and AI are where tech careers are built, and where they pay.

$100,000+ per year
Source

Median U.S. pay in computer and IT jobs: $109,470, against $50,980 across all occupations. Source: U.S. Bureau of Labor Statistics, May 2025 wages.

Prepstellar gives you the full course for every step: from the fundamentals, through the certification, to the interview.

  • Written lessons
  • Narrated audio
  • AI tutor
  • Spaced review
  • Mock exams
  • Code practice
Get it on Google Play Browse the courses

“This app is the ‘One Lake’ for preparing the certification exams. Really worth it.”

Abdelhak Y. Google Play review
Sign in: the sun of the onboarding, in green on the night sky
The study hub on the light theme, in magenta
A pandas lesson playing as narrated audio, in plum
The AI tutor answering a question about the card in front of you
Code practice: fill the gap in a SQL query with the right chip
Progress on the light theme: daily goal and spaced review
A timed mock exam in progress, in plum
The launch screen: the Prepstellar constellation on the night sky
Match: is this the correct answer? Wrong or correct, in seconds
Accuracy by section, as a radar
The study hub on the dark theme, in blue
The topics of the Python course on the light theme
The catalog: certifications from A to Z
Match: one question, one answer, a few seconds to decide
Courses: Python, SQL, statistics and interview prep
A SQL lesson card with its key table
The mock exam entry: quick or full
The study log: time spent, active days and accuracy
The study hub while a lesson plays
The topics of the Data Analysis course
A Python lesson playing as audio on the light theme
A timed mock exam in progress, in blue
The study log on the light theme
The study hub in plum

The IT academy of the future.

Why tech

Six-figure careers, hiring every year

Cloud, data and AI skills are some of the best paid in the job market, and employers keep hiring for them.

  • $109,470Median pay in U.S. computer and IT jobs
    Source

    Against $50,980 across all occupations. Source: U.S. Bureau of Labor Statistics, May 2025 wages.

  • 280,000Openings projected every year in U.S. computer and IT jobs
    Source

    Approximate yearly average, 2025–35. Source: U.S. Bureau of Labor Statistics, 2025–35 projections.

  • 35%Projected growth in U.S. data scientist jobs
    Source

    2025–35, much faster than average. Source: U.S. Bureau of Labor Statistics, 2025–35 projections.

  • Data engineers Between$156,250and$180,750 per year · US
    Source

    U.S. starting salaries, mid to high experience band. Source: Robert Half 2026 Salary Guide, 2026 edition.

  • Cloud architects Between$171,750and$202,250 per year · US
    Source

    U.S. starting salaries, mid to high experience band. Source: Robert Half 2026 Salary Guide, 2026 edition.

  • AI/ML engineers Between$170,750and$193,250 per year · US
    Source

    U.S. starting salaries, mid to high experience band. Source: Robert Half 2026 Salary Guide, 2026 edition.

  • Data scientists Between$153,750and$182,500 per year · US
    Source

    U.S. starting salaries, mid to high experience band. Source: Robert Half 2026 Salary Guide, 2026 edition.

  • Software engineers Between$142,000and$175,500 per year · US
    Source

    U.S. starting salaries, mid to high experience band. Source: Robert Half 2026 Salary Guide, 2026 edition.

  • Cloud engineers Between$132,000and$155,000 per year · US
    Source

    U.S. starting salaries, mid to high experience band. Source: Robert Half 2026 Salary Guide, 2026 edition.

  • Business intelligence developers Between$130,500and$156,500 per year · US
    Source

    U.S. starting salaries, mid to high experience band. Source: Robert Half 2026 Salary Guide, 2026 edition.

  • Data analysts in tech Between$117,250and$138,500 per year · US
    Source

    U.S. starting salaries, mid to high experience band. Source: Robert Half 2026 Salary Guide, 2026 edition.

  • Database administrators Between$119,750and$137,500 per year · US
    Source

    U.S. starting salaries, mid to high experience band. Source: Robert Half 2026 Salary Guide, 2026 edition.

What's inside

Everything a course should have

Six ways into the same course, all in one app, because reading something once isn't the same as knowing it.

Lessons, written and narrated

Every concept explained in prose you can actually read, and read aloud like a podcast for the commute, the gym or 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.

Code exercises

Hands-on SQL, Python and DAX tasks on a real dataset: complete the code and check it on the spot.

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.

Always current

When the exam changes, your course already has

Courses developed by tech professionals with years of experience, and anchored to the vendor's own documentation.

  1. Official docsEvery lesson traces back to the vendor's current study guide and documentation.
  2. Checked every dayWe monitor exam guides and vendor docs daily.
  3. Caught the same dayA new objective, a retired service, a changed exam: we know that day.
  4. Updated in hoursThe lesson is rewritten and in your app in hours, not days.
See the latest exam updates How it works

The catalog

Nineteen courses, one academy

  • 632Lessons
  • 6,320Practice questions
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 Data Statistics for Data Analysis Describing data, quantifying uncertainty, comparing groups, and modeling relationships. 28 lessons Databricks · Data Engineer Associate Databricks Certified Data Engineer Associate Building and governing data pipelines on the Databricks Lakehouse Platform. 37 lessons Interview Prep Data Analyst Interview Prep SQL under time pressure, experiments, metrics, business cases, and the take-home. 9 lessons Interview Prep Data Engineer Interview Prep Advanced SQL, data modeling, pipelines, reliability, and data-system design. 9 lessons Microsoft · AI-103 Developing AI Apps and Agents on Azure Building generative AI apps, agents, and multimodal solutions with Microsoft Foundry. 68 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

Out now

Prepstellar is on Google Play

Every course, on your Android phone. The iPhone and iPad app is coming soon to the App Store.

Get it on Google Play

“This app is the ‘One Lake’ for preparing the certification exams. Really worth it.”

Abdelhak Y. Google Play review

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.

Get it on Google Play