Free & Open Practice

Crack Any Coding Interview

500+ curated practice questions, six question types, and daily challenges — all in one free app built for developers.

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0+

Practice Questions

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Question Types

Daily

New Challenges

Free

No Paywalls

Everything You Need to Prepare

A focused toolkit to build real coding interview skills, not just memorize answers.

Code Challenges

Solve real-world coding problems with an integrated editor and instant feedback.

System Design

Tackle architecture questions from URL shorteners to distributed databases.

Daily Challenges

Fresh problems every day to keep your skills sharp and build consistency.

Knowledge Base

Concise explanations of data structures, algorithms, and patterns you need.

Behavioral Prep

Practice STAR-method responses for common behavioral questions at top companies.

Progress Tracking

Monitor performance across topics, track streaks, and find weak spots.

Built for Mobile-First Practice

A clean, distraction-free interface for focused coding practice anywhere.

Syntax Highlighting

Read code comfortably with full-color syntax support.

Difficulty Tags

Know what you're getting into before you start.

Quick Navigation

Swipe between problems and categories effortlessly.

Zeroth app showing a coding interview question with multiple choice answers

Integrated Editor

Write and test solutions right inside the app.

Hint System

Progressive hints when you're stuck — no spoilers.

Solution Walkthroughs

Step-by-step explanations after each attempt.

Get Started in Minutes

No sign-up walls or complicated setup. Just download and practice.

Download the App

Grab Zeroth for free from the App Store. No account required to start practicing.

Pick Your Focus

Choose from algorithms, system design, behavioral, and more — or try the daily challenge.

Solve & Learn

Work through problems with hints, solutions, and detailed explanations.

Track Your Progress

Build streaks, unlock badges, and watch your skills grow across topics.

Frequently Asked Questions

Is Zeroth really free?

Yes. All 500+ questions, daily challenges, and core features are completely free with no paywalls or hidden charges.

What programming languages are supported?

Questions and solutions are available in Python, JavaScript, Go, Java, and C++. The code editor supports syntax highlighting for all of them.

Do I need an account to use the app?

You can start practicing immediately without an account. Signing up lets you sync progress across devices and track streaks.

What types of questions are included?

Six categories: coding challenges, system design, behavioral, knowledge-based, debugging, and estimation — everything top companies ask.

How often is new content added?

New questions and daily challenges are added regularly. The question bank grows every week based on the latest interview trends.

Is it available on both iOS and Android?

Yes! Download Zeroth from the App Store. Android coming soon.