InterviewAce — AI-Powered Interview Preparation Platform
InterviewAce is a browser-based interview preparation platform built for software engineers, product managers, designers, and SREs preparing for technical and behavioral interviews. The platform combines real-time voice AI interviews with a curated bank of over 10,000 questions, 100 LeetCode-style coding challenges with full reference solutions, an autonomous AI study agent, and adaptive scoring that grades candidates the way a senior hiring manager would. A permanently free tier requires no credit card and includes 20 practice questions, 3 voice interview sessions, the curated question bank, and basic scoring reports.
How does the AI Voice Interview feature work?
The Voice AI Interview feature connects your browser directly to OpenAI's GPT-4o Realtime API through a secure Cloudflare Workers proxy that keeps API keys server-side. You speak naturally into your microphone and the AI interviewer responds in real time, with sub-second latency and full barge-in support — meaning you can interrupt the interviewer at any time and the conversation adapts. Each session is automatically scored across five dimensions: technical correctness, communication clarity, problem-solving approach, response depth, and culture-fit signals. Free tier users access voice interviews through the browser's built-in Web Speech API at zero cost. Paid plans unlock GPT-4o Realtime voice with natural-sounding speech and human-like pacing.
What questions are in the practice bank?
The InterviewAce question bank contains over 10,000 interview questions across 28 programming languages including JavaScript, TypeScript, Python, Java, C#, C++, C, Go, Rust, Swift, Kotlin, Dart, Ruby, PHP, Scala, R, Elixir, Erlang, Haskell, F#, Perl, Lua, PowerShell, SQL, MATLAB, Solidity, Bash, and Objective-C. Over 2,500 questions are real interview questions imported from MIT-licensed open-source GitHub repositories of verified questions asked at Meta, Google, Amazon, Stripe, and TikTok. Questions cover roles from Intern through Staff and Principal levels, and across categories including Frontend, Backend, Full-Stack, Data Science, Machine Learning, AI Engineering, DevOps, Site Reliability Engineering, Mobile, Product Management, and Product Design.
How are coding challenges structured?
The coding challenges section contains 100 LeetCode-style problems covering arrays, strings, linked lists, stacks, queues, trees, graphs, hash maps, dynamic programming, backtracking, and system design. Each problem includes a description, two to three input/output examples with explanations, edge case constraints, progressive hints, starter code in four languages, and full reference solutions in JavaScript, Python, Java, and TypeScript. The in-browser JavaScript runner lets candidates execute their solution against test cases and see real console output without leaving the page. Reference solutions cover patterns like Kadane's algorithm, Floyd's tortoise and hare, monotonic stacks, multi-source breadth-first search, longest increasing subsequence in O(n log n), least recently used cache implementation, trie data structures, and topological sort.
What does the AI Agent do?
The AI Agent is an autonomous interview preparation assistant. You set a goal in plain English — for example, "Prepare me for a Senior Software Engineer interview at Stripe in two weeks" — and the agent breaks the goal into steps you can watch run in real time. It uses seven specialized tools: a profile analyzer, a question scanner, a weak-spot finder, a study planner, a content creator, a mock interview generator, and a coach advisor. Pre-built templates include FAANG prep in four weeks, finding weak spots from your practice history, building a behavioral story bank using the STAR method, salary negotiation preparation, resume sanity checks, and reverse interview question lists for asking the interviewer.
What pricing plans are available?
InterviewAce offers four pricing tiers. The Free plan costs nothing forever and includes 20 practice questions, 3 Web Speech voice interviews, full access to the 2,500-question real interview bank, browse-only access to the 8,500+ question library, and basic scoring reports. The Starter plan at $19 per month or $14 per month billed yearly adds unlimited practice questions, unlimited Web Speech voice interviews, 30 minutes per month of GPT-4o Realtime voice, the full five-dimension scoring rubric, progress dashboard with streaks, and email support. The Pro plan at $49 per month or $39 per month billed yearly is the most popular tier and adds 3 hours per month of Realtime voice, the AI Agent for autonomous study plans, the AI Coach for unlimited chat sessions, advanced analytics with weak-area detection, and full coding challenge access. The Elite plan at $149 per month or $119 per month billed yearly adds unlimited Realtime voice minutes, one human coaching session per month, resume review and rewrite service, custom interview prep tracks, LinkedIn headline review, and a dedicated Slack channel for support.
How does scoring work?
InterviewAce uses Claude Sonnet 4.6 to evaluate every interview transcript against a five-dimension rubric: technical correctness scores the depth and accuracy of technical content, communication scores clarity and structure of speech, problem solving scores reasoning approach and handling of ambiguity, depth scores how appropriate the response is for the targeted seniority level, and culture scores collaboration and ownership signals. Each session produces an overall score from 0 to 100, per-question breakdown with scores and feedback, three to five strengths, three to five improvement areas, and a hiring verdict of strong hire, hire, lean hire, or no hire. The Dashboard tracks scoring trends across sessions and surfaces personalized insights about where to focus next.
Privacy and data handling
Interview transcripts are stored exclusively in your browser's localStorage and are never transmitted to InterviewAce servers. Scoring requests sent to Claude do not retain data — Anthropic's API does not train on customer prompts. Voice audio for the Realtime feature flows directly between your browser and OpenAI's API endpoints through a stateless Cloudflare Workers proxy that does not log audio content. The platform offers a 7-day money-back guarantee on all paid plans, no questions asked.
Internal navigation
Explore the platform: Voice AI Interview, Practice Mode, Mock Interview, 100 Coding Challenges, Question Bank (8,500+ questions), AI Study Agent, Pricing Plans, Your Progress Dashboard, Saved Questions.
Voice AI Interview Simulator
The InterviewAce Voice AI Interview is a real-time spoken interview simulation powered by OpenAI GPT-4o Realtime. The system listens to your spoken answer through your browser microphone, transcribes it with sub-second latency using Whisper, and responds with natural conversational follow-ups. Sessions support full barge-in: candidates can interrupt the interviewer mid-sentence and the AI adapts. Each interview runs against a curated bank of 55 hand-written questions sourced from real 2024-2026 interviews at Meta, Google, Amazon, Stripe, Uber, and TikTok, covering behavioral, technical, system design, and ML/AI focus areas. After the session ends, Claude Sonnet 4.6 evaluates the full transcript on five dimensions — technical correctness, communication clarity, problem-solving approach, response depth appropriate for seniority, and culture-fit signals — and produces a hiring verdict of strong hire, hire, lean hire, or no hire. Free tier users get 3 sessions using browser Web Speech (no OpenAI cost). Paid plans unlock GPT-4o Realtime voice with natural-sounding speech.
Practice Mode — Self-Paced Interview Question Practice
Practice Mode is the self-paced interview question feature. Users filter the 10,000-question bank by language, role, seniority level, difficulty, topic, and question type, then work through questions one at a time without a timer. After each answer, an AI explanation reveals the correct answer along with conceptual context, common follow-up questions, and the underlying principle. Bookmarks let candidates save tough questions for revision before interview day. Practice Mode supports all 28 programming languages with role-specific filters for Frontend, Backend, Full-Stack, Data Science, Machine Learning, AI Engineering, DevOps, Site Reliability, Mobile, Product Management, and Product Design across Intern through Staff/Principal seniority levels.
Mock Interview — Timed Pressure Test
The Mock Interview feature simulates real interview conditions with a strict 60-second timer per question. Sessions auto-advance if the candidate doesn't answer in time, mirroring the time pressure of actual technical screens. Configure language, difficulty, question type, and number of questions, then start the session. At the end, candidates receive a final score, accuracy breakdown by topic, time-pressure metrics, and a side-by-side review of every wrong answer with the correct answer and AI explanation. Sessions are saved to the Dashboard for trend tracking across multiple practice runs. Mock Interview is the closest InterviewAce feature to a real-world technical screen, designed to build mental endurance and time-management skills before the actual interview.
100 Coding Challenges with Reference Solutions
The Coding section contains 100 LeetCode-style algorithm and data-structure problems covering all major interview patterns: arrays, strings, linked lists, stacks, queues, trees, binary search trees, heaps, graphs, hash maps, dynamic programming, backtracking, two-pointer, sliding window, and design problems. Each problem includes a description, two to three input/output examples, edge case constraints, progressive hints, starter code in four languages, and full reference solutions in JavaScript, Python, Java, and TypeScript. Featured problems include Two Sum, Valid Parentheses, Reverse Linked List, Maximum Subarray (Kadane's), Linked List Cycle (Floyd's tortoise and hare), Daily Temperatures (monotonic stack), Number of Islands (DFS), LRU Cache (design), Course Schedule (topological sort), Longest Increasing Subsequence (O(n log n)), Group Anagrams, and Rotting Oranges (multi-source BFS). The in-browser JavaScript runner executes solutions against test cases without leaving the page.
Question Bank — 8,500+ Real Interview Questions
The Question Bank is the largest free interview question library on InterviewAce, with over 10,000 questions across 28 programming languages. Of these, 2,500+ are real interview questions imported from MIT-licensed open-source GitHub repositories of verified interview questions, including sudheerj/javascript-interview-questions, sudheerj/reactjs-interview-questions, sudheerj/angular-interview-questions, sudheerj/vuejs-interview-questions, learning-zone/python-interview-questions, learning-zone/java-interview-questions, learning-zone/nodejs-interview-questions, learning-zone/css-interview-questions, learning-zone/html-interview-questions, learning-zone/sql-interview-questions, learning-zone/react-interview-questions, learning-zone/mongodb-interview-questions, learning-zone/mysql-interview-questions, learning-zone/devops-interview-questions, and sudheerj/ECMAScript-features. Questions are filterable by language, role, seniority, difficulty, topic, and source. The remaining questions are practice MCQs covering core CS concepts (concurrency, memory, data structures, algorithms, async, networking, testing, error handling, databases, security, design patterns, performance) across all 28 languages.
AI Agent — Autonomous Interview Prep Assistant
The AI Agent is an autonomous interview preparation assistant. Users set a goal in plain English (for example, "Prepare me for a Senior Software Engineer interview at Stripe in two weeks") and the agent decomposes the goal into discrete steps that run autonomously. The agent operates seven specialized tools: a profile analyzer that reads practice history, a question scanner that surfaces gaps, a weak-spot finder that ranks topics by accuracy, a study planner that schedules learning sessions, a content creator that generates personalized notes, a mock interview generator, and a coach advisor. Pre-built templates cover FAANG prep in four weeks, weak-spot detection from practice history, behavioral STAR story bank generation, salary negotiation preparation with scripts and counter-offer strategies, resume sanity checks for recruiter red flags, and reverse interview question lists for asking the interviewer.
Pricing — Free, Starter, and Pro Plans
InterviewAce offers three pricing tiers designed for students, active job seekers, and working engineers. The Free plan costs $0 forever and includes 20 practice questions, 3 Web Speech voice interviews, browse access to the 8,500-question library, and basic scoring reports. No credit card is required. The Starter plan is $19 per month and adds unlimited practice, unlimited Web Speech voice, 30 minutes per month of GPT-4o Realtime voice, the full five-dimension scoring rubric, progress dashboard with streaks, and email support. The Pro plan at $49 per month is the most popular tier and adds 3 hours of Realtime voice per month, the AI Agent for autonomous study planning, the AI Coach for unlimited chat, advanced analytics with weak-area detection, and full coding challenge access. All paid plans include a 7-day money-back guarantee. Students with a valid .edu email receive 50% off the Starter plan.