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One Account. Three products.

A little more possibility.

Ostrae is a small family of web apps. Codae teaches you to program, Ostrae.email gives you an address of your own, and Layrae lets you design websites in your browser. One free Ostrae Account signs you in to all of them.

Create a free Account Explore the products

FreeEarly accessRun by a private individual in Germany

The family

Three products, one thread.

Every Ostrae product does one job and stays useful on its own: you can take Codae lessons as a guest, read all about Ostrae.email before you sign up and open Layrae without an Account. What ties them together is the Ostrae Account, one sign-in and one profile with your security settings in one place.

  1. 01CodaeLearn to program by writing real code in your browser.For learners, students and curious beginners
  2. 02Ostrae.emailYour own @ostrae.email address and a calm webmail.For anyone who wants an address of their own
  3. 03LayraeDesign and animate websites visually, then export them.For people who want a website without hand-writing code
  4. 04Ostrae AccountThe free sign-in and profile behind all three.For everyone who wants more than a guest session

Codae logo01 Learn · codae.ostrae.tech

Codae: learn to code by writing code.

Codae is a programming school that runs in your browser. Instead of hour-long videos, every lesson is a short loop you finish yourself: read a little, write the code, run it and check the result, until the idea sits.

Start learning on Codae Open the Codae app
A miniature of the Codae editor: the “Hello World” lesson on the left, Program.cs, the quick keys and Run & check on the right, and the program’s output below.

Who it is for

Beginners and up: students, people changing careers and anyone who wants to understand how software is made. The interface is available in English and German, and there is nothing to install.

What you can do today

  • Choose from 8 courses with 652 lessons in total, from C# and Python to HTML, CSS and JavaScript.
  • Type real code in an editor right in the browser and see what your program does straight away.
  • Get instant feedback: Check tells you whether the task is solved, and what is missing if it is not.
  • Keep track of completed lessons, XP and a daily streak.
  • Start without signing up. As a guest, your progress stays on this device.

With your Ostrae Account

Signing in unlocks MICA, the coach built into Codae. It gives hints instead of answers for your current task and code, and it can draft a personal course with chapters and exercises from a goal you describe. Your task, code and question are only shared when you ask. Signed in, your progress and settings also sync across devices.

Four moves, every lesson

  1. ReadA short explanation and one clear task.
  2. WriteYou type the code yourself, in a real editor.
  3. RunSee what your program actually does.
  4. CheckFind out if the task is solved, and what is missing.

The eight courses

8 courses · 652 lessons
  • C#Beginner friendly

    C# Fundamentals

    A structured course from your first lines of code to building your own small program.

    16 chapters128 lessons

  • HTMLBeginner friendly

    HTML: Structuring Websites

    Learn how to structure content semantically so that browsers and assistive technologies understand your website.

    10 chapters80 lessons

  • CSSBeginner friendly

    CSS: Styling Websites

    Style the HTML website to be readable, responsive, and consistent.

    12 chapters96 lessons

  • JavaScriptBeginner friendly

    JavaScript

    From programming basics and DOM interaction to a complete frontend project with JavaScript.

    16 chapters128 lessons

  • PythonBeginner friendly

    Python Fundamentals and Automation

    Beginner-friendly data processing and small automations using Python.

    14 chapters112 lessons

  • GitBeginner friendly

    Git, GitHub and Hosting

    Secure your work traceably and publish a website. Initially simulated repositories without external data; actual GitHub and hosting steps with your own project.

    6 chapters36 lessons

  • DesignBeginner friendly

    Design for Developers

    Understand and apply design decisions yourself. Not a course for pixel-perfect screenshots, but for sound product and UI design.

    6 chapters36 lessons

  • GSAPBeginner friendly

    GSAP Animations

    Learn intentional and performant web animations using GSAP. From fundamentals, timelines, and interactions to ScrollTrigger and an accessible landing page.

    6 chapters36 lessons

Browse every course and lesson in the Codae app

Ostrae.email logo02 Write · ostrae.email

Ostrae.email: an address of your own.

Ostrae.email is the webmail for your own @ostrae.email address, opened with your Ostrae Account. Its idea is in its tagline: mail, with room to focus. Folders on the left, messages in the middle, the open message on the right, and no advertising inside your inbox.

Visit Ostrae.email Create an Account to choose your address
The three-pane inbox layout. Placeholder lines stand in for mail; no real or sample messages are shown.

Who it is for

Anyone who wants a personal address that is separate from school, work or an old provider, and a quiet place to read and write. It is free during early access; to send and receive, you need an activated mailbox.

Get started in three steps

  1. Create an Ostrae Account. One Account for Ostrae.email and the other Ostrae products.
  2. Choose your address. Pick your @ostrae.email address in the Account and verify your recovery email. Activation usually takes 1–5 minutes.
  3. Open your inbox. Sign in with Ostrae to read, write and organise your mail.

Reserving an address and activating a mailbox are separate steps, so you can choose your name first.

With your Ostrae Account

Your address is chosen in the Account, and the Account signs you in to the inbox. Sign-in tokens are stored encrypted, and the mail server runs on AWS in Frankfurt.

Available now

  • Your folders, search and pagination
  • Read and unread, stars, Archive and Trash with restore or permanent delete
  • Compose and reply with Cc and Bcc, up to 10 recipients and 12,000 characters
  • Up to 20 sent messages per 24 hours
  • MICA summaries, reply suggestions and draft rewrites, with a daily limit
  • Light and dark appearance, and a layout made for phones

Not available yet

  • Attachment downloads. Attachments are listed with name and size.
  • Saved drafts
  • Contacts and creating new folders
  • Rich HTML view. HTML mail is shown as text, and remote images are not loaded.

Layrae logo03 Make · layrae.ostrae.tech

Layrae: design and animate websites in your browser.

Layrae is a visual website designer. Describe the site you have in mind or start from a template, shape it on a canvas, add motion, and export the result as plain HTML and CSS files.

Open Layrae
A simplified Layrae canvas with breakpoints, an animation, the AI prompt and Export ZIP.

Who it is for

People who want a website without writing the code by hand, whether for a portfolio, a small business, a club or a product idea. If you do write code, it is a quick way to sketch layouts and animations.

What you can do today

  • Start by describing a site or app, or from a template: Blank site, SaaS landing, Portfolio or Restaurant.
  • Edit pages, layout, styles, fonts and responsive breakpoints visually.
  • Add entrance and scroll animations built on GSAP, plus optional libraries such as Lenis, Swiper, Anime.js, Motion, Alpine.js and Lottie.
  • Let the AI assistant build and edit the design from your instructions.
  • Export a ZIP with one HTML file per page, a shared stylesheet and your images.

With your Ostrae Account

Projects are saved in your browser, on your device. If you sign in with an Ostrae Account that includes Layrae, your sites and AI chats stay in sync across devices; the hosted AI also requires that access.

MICA logo, a small purple ghost

The assistant

MICA helps when you ask, and only then.

MICA is the assistant you meet in Codae and Ostrae.email. It follows one principle: you decide what it sees and what happens with its suggestions. Using MICA requires an Ostrae Account.

In Codae

Hints, not answers. Ask about your current task and code, and MICA explains the next step. Describe a goal, and it drafts a personal course with chapters and exercises.

In Ostrae.email

Summaries of the selected message, reply suggestions you can edit and rewrites of your draft, within a daily limit. Only the selected message or draft is shared with Google Vertex AI for that request. MICA Desktop on Windows can connect to your inbox if you enable it.

  1. It helps only when you ask.

    MICA does nothing on its own. You open it, you ask, it answers.

  2. It sees only what you select.

    Your current task and code in Codae, or the one message or draft you chose in Ostrae.email. Nothing else.

  3. Nothing happens without your action.

    Suggestions wait for you. Nothing is inserted into a draft and nothing is sent until you click.

  4. It can be wrong.

    AI suggestions can contain mistakes. Read them like advice from a helpful friend, and keep the final word.

Honest status

Good to know.

The short version of how Ostrae works today, so you know what you are signing up for.

Price
Free. Creating an Account does not start a subscription.
Status
Early access. Features are actively developed and can change, and there is no guaranteed availability.
Who runs it
A private individual in Germany, not a registered company. Contact details are in the Ostrae imprint.
Where it runs
Ostrae Account is hosted on Vercel, configured for Frankfurt. The Ostrae.email mail server runs on AWS in Frankfurt.
Cookies
Ostrae Account uses only necessary session cookies; optional tracking cookies are not implemented. This page stores only your appearance choice, in your browser.
Ads
ostrae.tech shows no ads. The public Codae site and the public Ostrae.email landing page have optional ad placements. Private inboxes and Account pages do not load ads.
Minimum age
12 years. If you are under 18, you need a legal guardian’s authorization.

FAQ

Questions, answered.

Still unsure? The privacy notice and terms of use have the details.

What is Ostrae?

A small family of web services connected by one Ostrae Account: Codae for learning to program, Ostrae.email for your own email address and Layrae for designing websites. It is run by a private individual in Germany.

Does it cost anything?

No. Ostrae is currently free, and registering does not start a subscription. Ostrae is in early access, so features can still change.

Do I need an Account for Codae?

No. You can start lessons as a guest without signing up; your progress then stays on that device. With an Ostrae Account, progress and settings sync across devices, and you can use MICA, the coach in Codae.

What can I do with Ostrae.email today?

Read, search and organise mail in your folders, star, archive and restore messages, and write and reply with Cc and Bcc to up to 10 recipients, with up to 20 sent messages per 24 hours. Attachment downloads, saved drafts, contacts and new folders are not available yet.

Where are my Layrae projects stored?

In your browser, on your device. If you sign in with an Ostrae Account that includes Layrae, your sites and AI chats stay in sync across devices. You can export a ZIP with your HTML pages, stylesheet and images.

How is my Account protected?

With a password of at least 15 characters, passkeys with device user verification, two-factor authentication with an authenticator app and recovery codes, and a list of active sessions you can end. Email verification is required when you register.

Who runs Ostrae?

A private individual in Germany. Ostrae is not a registered company; the contact details are in the imprint.

Are there ads?

Not on this page, not in your inbox and not on Account pages. The public Codae site and the public Ostrae.email landing page have optional advertising placements.

Start with one Account.

Create your free Ostrae Account once, then learn on Codae, choose your @ostrae.email address and design with Layrae.

Create a free Account Sign in