๐ Update (November 2026): CloudPrep now covers three AWS exams. Solutions Architect โ Associate (SAA-C03) and Developer โ Associate (DVA-C03) joined Cloud Practitioner (CLF-C02), with 1,000 questions each.
๐ Read what's new: CloudPrep Now Covers SAA-C03 and DVA-C03
TL;DR: CloudPrep is a free practice simulator for three AWS certification exams: Cloud Practitioner (CLF-C02), Solutions Architect โ Associate (SAA-C03) and Developer โ Associate (DVA-C03). It has 4,000 original questions, an explanation for every option, real-format 65-question mock exams, and an optional on-device AI proctor. No ads, no paywall.
๐ Try it: aws-cloud-prepare.vercel.app
๐ค Why I built it
CloudPrep started as my own preparation tool for the CLF-C02 exam. I wanted practice that felt like the real exam: the same length, the same timing, the same pressure. I also wanted every answer explained and backed by an AWS source.
So I built it, and then made it a free, public product so anyone preparing for the exam can use it too. Since then it has grown to cover the Solutions Architect and Developer Associate exams as well.
๐ CloudPrep at a glance
| ๐ 4,000 | ๐ 3 | โฑ๏ธ 65 | ๐ธ Free |
|---|---|---|---|
| original questions, each option explained | AWS exams: CLF-C02, SAA-C03 and DVA-C03 | questions per mock, timed like the real exam (90 or 130 minutes) | no ads, no paywall |
| Exam | Mock exam | Questions in CloudPrep |
|---|---|---|
| Cloud Practitioner (CLF-C02) | 65 questions, 90 minutes | 2,000 |
| Solutions Architect โ Associate (SAA-C03) | 65 questions, 130 minutes | 1,000 |
| Developer โ Associate (DVA-C03) | 65 questions, 130 minutes | 1,000 |
The CLF-C02 questions are split across its four domains:
| Domain | Exam weight | Questions in CloudPrep |
|---|---|---|
| 1. Cloud Concepts | 24% | 400 |
| 2. Security and Compliance | 30% | 600 |
| 3. Cloud Technology and Services | 34% | 753 |
| 4. Billing, Pricing, and Support | 12% | 247 |
SAA-C03 and DVA-C03 each have 1,000 questions across their four domains.
โจ What you can do with it
Pick your exam from the exam switcher at the top. Your progress, bookmarks and exam history are kept separately for each exam.
1. ๐ Learning mode: practise at your own pace
- Untimed practice by domain or topic
- Instant feedback with an explanation for every option, not just the correct one
- Links to the AWS documentation each question is based on
- Bookmarks for questions you want to revisit
- Review due: missed questions come back on a schedule so you see them again before you forget them
Review schedule: 1 day โ 3 days โ 7 days โ 21 days โ 60 days
๐ก Learning mode works without an account. Just open the site and start practising.
2. โฑ๏ธ Timed mock exams: the real thing, before the real thing
- 65 questions per mock: 90 minutes for CLF-C02, 130 minutes for SAA-C03 and DVA-C03, following each exam's domain weightings
- Flag questions, jump around with a question grid, and do a final review
- Auto-submit when the timer runs out
- An exam-paper style answer sheet
- The timer counts down to a fixed end time, so it survives reloads
3. ๐ Results that tell you what to fix
- Practice score with a per-domain breakdown
- Answer review with explanations
- Exam history and progress guidance across attempts
- The dashboard flags your weakest domain and shows the time used in recent exams
4. ๐ค AI-proctored exams (opt-in)
Want to train under real exam conditions? Turn on the AI proctor.
- A check-in, like an online proctored exam
- MediaPipe face and object models plus microphone loudness, all running on your device
- It watches your face, head, eyes and mouth, looks for phones, other people, books and screens, and blocks shortcuts
- Two warnings, then the exam ends. A phone or another person ends it at once.
๐ Nothing is recorded or uploaded. It all runs in your browser.
There's also a lighter strict mode that asks for fullscreen and logs tab and focus changes, without judging them.
5. โ๏ธ Sync across devices
- Sign in with Google to save your progress, bookmarks, exam history, the exam in progress and settings to your account
- Everything follows you to every device
- A copy is kept in the browser, so it stays fast and works offline. Changes sync when you're back online.
6. ๐จ Designed for long study sessions
- Light theme and a true-black dark theme
- Serif titles, rounded cards and an exam-paper answer sheet
- Add to Home Screen support with its own icons
- Automated axe accessibility checks (WCAG 2.2 AA rules) pass on every page, in both themes
๐ฅ Guest vs signed in
| Feature | Guest | Signed in (Google) |
|---|---|---|
| Learning mode | โ | โ |
| Bookmarks and settings | โ (this browser only) | โ (synced) |
| Timed mock exams | โ | โ |
| Dashboard, history and progress | โ | โ |
| Sync across devices | โ | โ |
๐ ๏ธ Tech stack
For the developers reading this, here's what's under the hood:
| Layer | Tech |
|---|---|
| Frontend | React 19, TypeScript (strict), Vite 8, Tailwind CSS 4, React Router |
| Backend | Supabase only: Postgres with Row Level Security + Supabase Auth (Google). No separate API server. |
| Data | Questions loaded at runtime and cached in IndexedDB; user data in a versioned localStorage layer, synced to Supabase when signed in |
| AI proctor | MediaPipe face and object models, running on-device |
| Testing | Vitest + Testing Library (database schema and security rules run in PGlite), Playwright + axe for E2E and accessibility |
| Hosting | Vercel (static site; the public pages are pre-rendered at build time) |
๐งพ Honest notes
I'd rather you trust it for the right reasons, so:
- โ ๏ธ CloudPrep is not affiliated with or endorsed by AWS. A practice score doesn't predict or guarantee an official result.
- ๐ It shows the percentage you got right. It does not estimate AWS's scaled 100โ1,000 score.
- โ๏ธ The questions are original, written with AI assistance from public AWS documentation and each exam's official guide, then checked against the pages they cite. They are not copied from the real exam or from dumps.
- โ CLF-C02: 1,995 of the 2,000 questions are checked against their AWS sources; 5 are still marked unverified.
- โ SAA-C03 and DVA-C03: all 1,000 questions in each are checked against their AWS sources.
๐ Try it and tell me what you think
If you're preparing for an AWS exam (Cloud Practitioner, Solutions Architect โ Associate or Developer โ Associate), give it a go:
๐ aws-cloud-prepare.vercel.app
I'd love your feedback:
- ๐ฌ Found a question that's wrong or unclear? Tell me in the comments.
- ๐ Something broken on your browser or device? Let me know.
- โญ If it helps you, share it with someone who's preparing for an AWS exam.
Good luck with your exam! โ๏ธ
Preparing for frontend interviews too? Check out Frontend Interview Prep, with React and JavaScript interview questions and answers.
Made by Shubham Chaudhary ยท Portfolio
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