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What is System Design Interview Prep?

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System Design Interview Prep is one of our Developer Tools. Practice system design questions with AI evaluation. Design scalable systems and get expert feedback. Paste your input, get the parsed or generated output instantly, and copy it straight into your project. It runs on our servers, so it needs a free AnythingText account to use — AI-powered tools may also require an active plan. More in this collection: A toolkit for software engineers.

How to use System Design Interview Prep

  1. 1

    Sign in to AnythingText with your Google account.

  2. 2

    Open System Design Interview Prep and paste your input.

  3. 3

    Review the parsed or generated output, including any errors it flags.

  4. 4

    Copy the result into your project.

Key Features

Errors surfaced

Invalid input is flagged with the position and reason, not a generic failure.

Copy-ready output

Formatted so it drops straight into your codebase.

Processed, not stored

Your input is used to produce the result and is not kept afterwards.

Works on any device

Full functionality on phone, tablet, and desktop.

Who Is This For?

Developers

A quick utility that does not need a local install.

DevOps and SRE

Check and generate configuration on the spot.

Debugging

Inspect payloads without wiring up tooling.

Frequently Asked Questions

Is System Design Interview Prep free?

You need a free AnythingText account to use it, because it runs on our servers rather than in your browser. AI-powered tools also draw on a paid plan — the pricing page lists what each plan includes.

Do I need to create an account?

Yes — sign in with Google and you can start straight away. The account exists so the server-side run can be attributed and rate-limited fairly.

What happens to my data?

Your input is sent to our server, used to produce the result, and not stored afterwards. Tools that call an AI provider are covered in detail on our AI processing page.

Does it validate my input?

Yes. Malformed input is reported with the position and the reason, so you can fix the source rather than guess.

Do I need to install anything?

No. System Design Interview Prep runs in the browser on desktop, tablet, and phone. There is nothing to download and nothing to keep updated.

More detail on plans is on our pricing page, and how AI-powered tools handle your data is covered on the AI processing page.

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Quick Start

Use your API key in the X-API-Key header:

curl -X POST https://anythingtext.com/api/tools/case \
  -H "Content-Type: application/json" \
  -H "X-API-Key: atk_your_key_here" \
  -d '{"text": "hello world", "mode": "upper"}'

See API Documentation for all available endpoints.

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