Last updated: July 2026. Written by Josh Hutcheson, OnlineCourseing editor.
QUICK VERDICT
Best overall: REST APIs with Flask and Python by Jose Salvatierra is the standout — 4.5 stars from 25,000+ ratings, 147,000+ students, and refreshed for 2025. It’s the most practical way to learn Flask by building real APIs.
- Free & official: Flask docs + Miguel Grinberg’s Mega-Tutorial
- Text-based path: Educative’s Become a Flask Developer
- Where it fits: lighter-weight than Django — ideal for APIs and small services
Flask is Python’s most popular microframework — a minimal, flexible way to build web apps and APIs where you assemble exactly the pieces you need. It’s a favorite for REST APIs, small services, and prototypes, and it’s often the framework developers learn to understand how web plumbing actually works. We tested the current options; below are the Flask courses worth your time in 2026, each verified live with real ratings shown.
Why Learn Flask?
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Flask’s philosophy is the opposite of Django’s: instead of giving you everything up front, it gives you a small, solid core and lets you choose your own database layer, forms, and extensions. That makes it lightweight, easy to understand, and ideal when you don’t need the full weight of a batteries-included framework — building a REST API, a microservice, or a small web app. It’s also an excellent teacher: because Flask hides less, you learn how routing, requests, templates, and databases actually connect. For Python developers, Flask plus a REST-focused course is one of the fastest routes to shipping a working backend, and Flask skills appear constantly in backend and API job listings.
The Best Flask Courses at a Glance
| Course | Provider | Rating | Best for |
|---|---|---|---|
| REST APIs with Flask and Python | Udemy (Salvatierra) | 4.5 (25,210) | Overall best; APIs |
| Flask Mega-Tutorial | Miguel Grinberg (free) | Free | Deep, free, full-app |
| Become a Flask Developer | Educative | Text-based | Readers who skip video |
1. REST APIs with Flask and Python (Best Overall)
Jose Salvatierra’s course is the one we recommend to most people, and its title literally carries the year — it’s updated for 2025, with 4.5 stars from 25,210 ratings and 147,000+ students. Rather than teaching Flask in the abstract, it teaches it the way most people actually use it: by building REST APIs, with real coverage of request handling, authentication with JWTs, databases via SQLAlchemy, testing, containerizing with Docker, and deployment. Salvatierra keeps it genuinely current, which is rare in this niche. If you want to learn Flask by shipping a working API, this is the course.
2. The Flask Mega-Tutorial (Best Free)
Miguel Grinberg’s Flask Mega-Tutorial is a legend in the Python community for good reason: it’s a free, deeply thorough, step-by-step series that walks you through building a complete social-blogging application, covering databases, user logins, email, pagination, full-text search, and deployment. Grinberg is a genuine authority on Flask, and the tutorial is regularly maintained. It asks more of you than a hand-held video course — it’s reading-heavy and expects you to type along — but for a motivated learner it’s arguably the single best Flask resource at any price. Start here if you’re disciplined and want depth for free.
3. Educative: Become a Flask Developer (Text-Based)
If you prefer structured, interactive reading to either video or a long free tutorial, Educative’s Become a Flask Developer path runs in the browser with hands-on code widgets and no setup. It’s a good fit for experienced developers who want to move fast and practice inline. Educative is subscription-based, so it pays off most if you’ll use it across several topics.
How to Choose the Right Flask Course
If your goal is building APIs — the most common reason to use Flask — Salvatierra’s course is the direct route. If you’re disciplined and want maximum depth for free, work through Grinberg’s Mega-Tutorial. If you prefer interactive reading, Educative’s path is the fastest to skim. Whatever you choose, prioritize building a real project: Flask is small enough that you learn it best by wiring up your own app. And make sure your course covers SQLAlchemy and authentication — those are where most real Flask work lives. Curious whether Flask or its heavier cousin fits your project better? See the comparison below and our guide to the best Django courses.
What a Good Flask Course Covers
Because Flask is a microframework, a good course teaches you not just Flask itself but the ecosystem you assemble around it. Expect the core — routing, request handling, and Jinja2 templates — plus the pieces most real apps need: SQLAlchemy for database access, Flask-Migrate for schema changes, WTForms or Marshmallow for forms and validation, and authentication (sessions for web apps, JWTs for APIs). For the API path that most people take, look for REST design, blueprints for structuring larger apps, error handling, and Flask-RESTful or similar. Rounding it out: testing with pytest, containerizing with Docker, and a real deployment. Salvatierra’s course hits these API-focused essentials well; Grinberg’s tutorial covers the full-web-app angle including email and search. If a Flask course teaches only routing and templates, it’s a first hour, not a full course — the value is in how the extensions fit together.
Flask vs. Django: Which Should You Learn?
Choose Flask when you want a lightweight, flexible framework and full control — ideal for REST APIs, microservices, small apps, and for learning how the pieces fit together. Choose Django when you want a batteries-included framework that ships with an ORM, admin, and authentication out of the box — better for larger, conventional, database-heavy applications. Flask has a gentler core but leaves more assembly to you; Django does more for you at the cost of flexibility. Many Python developers learn both and pick per project. If you’re building a big app fast, lean Django; if you want control and a smaller footprint, lean Flask.
Flask Courses — FAQ
What is the best Flask course?
For most people it’s REST APIs with Flask and Python by Jose Salvatierra: 4.5 stars from 25,000+ ratings, 147,000+ students, and updated for 2025. For a free option, Miguel Grinberg’s Flask Mega-Tutorial is exceptional.
Can I learn Flask for free?
Yes, and one of the best Flask resources anywhere is free: Miguel Grinberg’s Flask Mega-Tutorial. Combined with the official Flask documentation, it’s a complete path for a motivated self-learner.
Is Flask easier than Django?
Flask has a smaller, simpler core, so its starting point is gentler and easier to understand. But because it does less for you, building a full-featured app can require more assembly than Django. For small apps and APIs, Flask is simpler; for large conventional apps, Django’s built-ins save work.
Do I need Python before learning Flask?
Yes — Flask is a Python framework, so you should be comfortable with Python fundamentals first. Once you know the basics of functions, classes, and modules, Flask is one of the quickest frameworks to become productive in.
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