The disclosure that should be at the top of every post like this: I created Grokking the System Design Interview, which means I have a financial interest in you paying for it instead of downloading a copy. So read this skeptically. The way I've tried to earn your trust is by being specific about what the free copies actually contain, acknowledging the situations where using free material is the reasonable choice, and pointing you to the official free options first. If anything reads like scare tactics instead of honest information, push back.
If you searched for a free version of Grokking the System Design Interview, you found things. GitHub repositories with the lessons pasted in. PDFs on document-sharing sites. Archived copies of the old course pages. The name has been recognizable in interview prep for years, and recognizable names get copied.
So the question isn't really "does a free version exist." Copies exist. The real questions are: what's actually in those copies, what would studying from one cost you in an interview, and what free options exist that don't have those problems.
This post answers all three, honestly.
The short answer
- Yes, unofficial copies exist. They're snapshots of the old text-only version of the course, most of them taken years ago. They're missing everything the course has become since, and interviews have moved on from the material they contain.
- Yes, official free options exist too. The course has a free tier on DesignGurus.io that includes the introductory lessons, the start of the fundamentals chapter, and the AI study features. There's also an official free companion repo on GitHub that we maintain, plus free guides that cover the framework itself.
- If money is the obstacle, there are legitimate paths. Regional pricing, an annual subscription that costs far less than the old lifetime-only pricing, and a free-material route that can genuinely carry you a long way. More on that below.
Why free copies of this course are everywhere
Some history explains the situation.
The original Grokking the System Design Interview launched in 2018 as a primarily text-based course, and an early version was hosted on a third-party platform. Text is trivially easy to copy. Over the years, the lessons were scraped, pasted into GitHub repos, exported to PDFs, and re-uploaded in dozens of places. Some of those copies now rank in search results and get shared in prep communities as "the free version of Grokking."
Here's the part most people downloading them don't realize: those copies froze the course at the moment they were taken. The course didn't freeze. It moved to its permanent home at DesignGurus.io, got rebuilt from the ground up, and has been updated continuously since. The copies kept circulating anyway, because nothing about a PDF tells you it's stale.
So when someone says "I found Grokking free on GitHub," what they found is a snapshot of a text-only course as it existed years ago, with none of the fixes, none of the new material, and none of the format changes since.
What the PDFs and GitHub copies actually contain
Let me be concrete about the gap, because "it's outdated" is the kind of vague claim a course owner would make even if it weren't true.
A typical floating copy contains the old text lessons with static diagrams. That's it. Here's what it doesn't have, and why each gap matters:
The expanded trade-offs module. The trade-offs module more than doubled from its original size to 22 lessons, with recent additions like serverless vs traditional, stateful vs stateless, and read-heavy vs write-heavy systems. Senior-level interviews are won and lost on trade-off conversations, and this is the module readers most often say made the difference. The copies predate most of it.
The newer case studies. Interview problems shift. The flash-sale problem, payment systems, notification systems, and distributed counters have become common in recent loops. The copies contain the problem set from years ago and nothing that was added as interviews evolved.
Video walkthroughs and interactive diagrams. The current course pairs every case study with video and diagrams that build step by step. System design is spatial, and watching a design assemble in the order you'd build it at a whiteboard is a genuinely different learning experience than reading a paragraph. A PDF cannot contain this by definition.
The quizzes. Around 400 quizzes now run through the course, with nearly every module and case study ending in one. Active recall is one of the most reliable retention techniques there is, and the copies have zero of it.
The AI features. The design playground (sketch your own design, get feedback before seeing the solution) and the inline explainer were added in 2026. Both are included in the official free tier, which means the free tier now includes study tools that no pirated copy will ever have.
Corrections. Errors get fixed in the live course. They live forever in the copies.
For the full picture of what changed, the 2026 update rundown goes through it all.
The three options, side by side
| Floating PDF or GitHub copy | Official free tier | Full course | |
|---|---|---|---|
| What it is | Unofficial snapshot of the old text course | The real course, first sections open | All 83 lessons across 5 chapters |
| Content age | Frozen years ago | Current, updated continuously | Current, updated continuously |
| Format | Text and static images | Video, text, interactive diagrams | Video, text, interactive diagrams |
| Quizzes and AI features | None | AI playground and explainer included | ~400 quizzes plus AI features |
| Case studies | The old set only | Preview | 18 worked problems, updated set |
| Cost | Free | Free | Lifetime or annual subscription, regional pricing |
| Honest best use | Last resort if paying is truly impossible | Evaluating the course, starting fundamentals | Actual interview preparation |
The official free options, in order of usefulness
If your goal is to get real value without paying, here's what I'd actually point you to. This is the path I'd give a friend who told me money was tight.
1. The free tier of the course. Sign up free on DesignGurus.io and you get the introductory lessons, the start of the system design fundamentals chapter, and both AI features. No payment details required. Unlike the copies, this is the current material in the current format.
2. The official GitHub companion repo. We maintain design-gurus/grokking-system-design as a free, open companion to the course: the interview framework, summaries of the core building blocks, and cheat sheets. It's an index and reference, not the full course, but it's accurate, current, and actually maintained. If you want "Grokking on GitHub," this is the version that isn't stale.
3. The free guides. The 6-step interview framework and prep plan is documented in full on this site, free. So is the complete curriculum, so you can see exactly what the course covers. On the DesignGurus blog, the system design fundamentals guide, the cheat sheet, and the interview questions collection are all free and all current.
An engineer who works through the free tier, the companion repo, and those guides, and then does mock interviews with peers, has a legitimately solid preparation path without spending anything. It's more work to assemble than the paid course, which is the honest trade: the course's price buys structure and completeness, not access to secrets.
If money is the real problem
Three things worth knowing before you decide the paid course is out of reach:
Regional pricing exists. Course prices adjust based on your location. The US sticker price is not what engineers in most of the world pay. Check the actual price shown to you before assuming.
The annual subscription changed the math. The old complaint about Grokking was that it was lifetime-purchase-only at a steep price. That's no longer the model. There's a cheaper annual subscription that unlocks all Design Gurus courses, which exists specifically for people preparing for one interview cycle. The honest review covers the pricing trade-offs in detail, including when I'd tell you not to buy.
The interview math is lopsided. I'm always careful with this argument because it can justify any price, but it's real: a system design round often decides between offer levels that differ by tens of thousands of dollars a year. If the course price is genuinely impossible, use the free path above. If it's merely annoying, weigh it against what the interview is worth.
And the honest last resort: if paying is truly not an option and the free materials don't feel like enough, a stale copy is better than walking in unprepared. I'd rather you know its limitations and study anyway than skip preparation. Just go in knowing the material is years old, cross-check anything that matters against current free sources, and don't let a 2020-era problem set convince you that 2026 interviews still look like that.
A note on the copyright question
I'll keep this short because nobody reading this wants a lecture. The floating copies are unauthorized redistributions of copyrighted material. We could spend energy chasing them; mostly we've chosen to spend it making the official course clearly better than any snapshot of it can be. Videos, interactive diagrams, quizzes, AI feedback, and continuous updates are things a PDF structurally cannot offer. That's the strategy: make the real thing obviously worth it, and make the free tier good enough that you can verify that yourself before paying.
The honest bottom line
Free copies of Grokking the System Design Interview exist, and they're worse than most people downloading them realize: not because the old text was bad, but because the course stopped being that text years ago, and interviews stopped matching that era's material.
If you want free, start with the official free tier, the companion GitHub repo, and the free guides. That combination is current, legal, and genuinely useful. If your preparation gets serious, the paid course adds the structure, the full case-study set, and the practice loop, with regional pricing and an annual option if lifetime pricing doesn't fit.
Either way, don't build your interview preparation on a snapshot of 2020. The interview you're walking into is happening in 2026.
Frequently Asked Questions
Is Grokking the System Design Interview free?
The full course is paid, but there's an official free tier on DesignGurus.io that includes the introductory lessons, the start of the fundamentals chapter, and the AI study features. No payment details are required to use it.
Is there an official PDF of Grokking the System Design Interview?
No. The course was never published as an official PDF. Any PDF you find is an unauthorized copy of the old text-only version, frozen at whatever point it was scraped and missing the video lessons, interactive diagrams, quizzes, and years of updates.
Are the GitHub copies the real course?
The unofficial repos contain scraped text from the old version of the course. The only official GitHub presence is design-gurus/grokking-system-design, a free companion with the framework, building-block summaries, and cheat sheets, maintained by the course team.
What does the free tier actually include?
The introductory chapter, the start of the system design fundamentals chapter, and both AI features (the design playground and the inline explainer). It's enough to evaluate the format and start learning before deciding whether to pay.
Is there a discount if the price is a problem?
Regional pricing applies automatically based on location, and the annual subscription is significantly cheaper than lifetime access if you only need the course for one interview cycle. The annual option also unlocks all Design Gurus courses, not just this one.
Can I pass a system design interview studying only a free copy?
Some people have. But you'd be studying a years-old problem set without the trade-offs material that senior interviews now emphasize, with no practice loop and no way to check your own designs. If free is the constraint, the official free tier plus the free guides is a stronger path than a stale copy.
Why is the course on DesignGurus.io and not where I originally saw it?
An early version of the course was hosted on a third-party platform years ago. The course's permanent home is DesignGurus.io, where it was rebuilt with video and interactive content. The full story is on the homepage, including how to tell the original from the similarly named courses.
Related reading
- What's New in Grokking System Design in 2026. Everything the floating copies are missing: the rebuild, Volume II, AI features, and quizzes.
- Grokking the System Design Interview Review: Is It Worth It?. The honest founder review, including who shouldn't buy the course.
- About Grokking the System Design Interview. What the course is, who built it, and where the official version lives.
- The Full Curriculum. Every lesson, free to browse, so you know exactly what the course covers before paying anything.
- The Complete Interview Guide. The 6-step framework and an 8-week prep plan, free on this site.
Start with the real free tier
The most reliable way to evaluate the course is the official free tier. Current material, the AI features included, and no payment details required. If it's not for you, you'll know within an hour, and you'll have lost nothing.
Start Free on DesignGurus.io · Browse the Free Companion Repo