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Simple, transparent pricing

Invest in your data career

Practice SQL & Python across 15 industry domains — with the only platform that visualizes every query you write and coaches you through it with an AI mentor.

Founding Member Pricing1000 of 1000 left

Free

Start your data journey

$0/mo
Get Started Free

Includes

126 SQL questions
124 Python questions
5 visualizations / day
Free datasets
News & Blog access
Learn section access
Quick Recall interview cards
Founding Offer

Pro

Lock in founding pricing for 12 months

$3.99/mo
$9.99/mo60% off for 12 months

Billed in USD · International cards accepted

After 12 months: $9.99/mo

Everything in Free, plus

650+ SQL questions
650+ Python questions
Unlimited visualizations (SQL & Python)
15 industry domains with production-grade data
LDS Mentor — Learn Mode (AI tutor)
LDS Mentor — Interview Mode (AI interviewer)
Priority support
Early access to new content
Secure via Razorpay
Cancel anytime
Instant access

SQL & Python Visualization — Only on LDS

Watch your code come to life. SQL visualization breaks down joins, filters, aggregations, and window functions into interactive diagrams. Python visualization traces each pandas operation step-by-step so you see exactly how your data transforms.

Free: 5/day|Pro:

LDS Mentor — Your AI Interview Coach

Pro Only

Two distinct AI coaching modes built into every problem. Choose based on where you are in your prep — deep learning or crunch-time interview practice.

Learn ModeSocratic

Discovery over instruction

Asks you what you expected before explaining what went wrong. Guides you to the answer with targeted questions — never lectures, never hands it over. The understanding you build here transfers to every future problem.

Predict-then-explain: retention-proven technique
Identifies root cause, not just the symptom
One concept at a time — no cognitive overload
Connects patterns to real interview scenarios
Interview ModeDirect

Week-before-interview intensity

No warmup, no questions — leads straight with the approach and exact pattern. Ask "what's wrong?" and it diagnoses directly. Flags SQLite quirks, common interview traps, and the specific gotchas interviewers use to trip candidates.

Direct diagnosis — no deflection, no runaround
Leads with approach and strategy immediately
Proactively flags interview-specific gotchas
Efficiency-first: gets you unstuck fast
Available on every problem — SQL and Python, across all 15 industry domains

Compare Plans

Every feature, side by side

Free
Pro
Practice
SQL Questions
126
650+
Python Questions
124
650+
Visualization (SQL & Python)
5 / day
Unlimited
Industry Domains
15 domains
AI Mentor
LDS Mentor — Learn Mode
LDS Mentor — Interview Mode
Content
Audio Content
10 / day
Unlimited
News
Blog
Learn Section
Quick Recall
Support
Priority Support
Perks
Early Access

Frequently Asked Questions

Everything you need to know

LDS is built to be the all-in-one platform for data science professionals. You get SQL and Python practice, step-by-step query and code visualization, interactive courses, interview recall cards, curated industry news, and in-depth articles — all in one place. Our premium problems span 15 industry domains like AdTech, FinTech, Healthcare, Banking, etc., each with production-grade schemas that mirror how data teams operate at top companies. No other platform combines hands-on coding, visual execution walkthroughs for both SQL and Python, and learning resources under one roof.
Our first 1,000 paid subscribers lock in Pro access at a dramatically reduced founding price for their first 12 months. Monthly: $3.99/mo (₹349/mo). Annual: $29.99/yr (₹2,599/yr). After the founding period, your subscription transitions to regular pricing — monthly: $9.99/mo (₹849/mo), annual: $79.99/yr (₹6,999/yr). This is our way of rewarding early supporters.
Absolutely. Cancel anytime from your account settings. No questions asked. You keep access until the end of your billing period.
After 12 months, your subscription automatically transitions to regular Pro pricing. You'll be notified well before the change. You can cancel anytime before or after the transition.
LDS Mentor is your AI-powered coding coach, built specifically for data science interview prep. It has two modes. Learn Mode uses a Socratic approach — before explaining what went wrong, it asks what you expected to happen. This predict-then-explain technique is proven to double knowledge retention. It identifies root causes, addresses one concept at a time, and never just hands you the answer. Interview Mode is a direct tactical coach for the week before your interview. No Socratic warmup — it leads immediately with the strategy and exact pattern, diagnoses bugs directly when asked, and proactively flags SQLite quirks and interview-specific gotchas. Both modes are Pro-only and work on every SQL and Python problem across all 15 industry domains.
Our signature feature that brings your code to life. For SQL, it shows exactly how your query processes data step-by-step — joins, filters, aggregations, window functions — all rendered as interactive diagrams. For Python, it breaks down your pandas pipeline operation by operation so you can see how each transformation shapes the data. Free users get 5 visualizations per day; Pro members get unlimited access.
Pro unlocks 15 specialized domains: AdTech, Banking, FinTech Trading, Healthcare Claims, Lodging, Logistics, Food Delivery, Ride-Hailing, Payments, Real Estate, Retail, SaaS B2B, Social Graph, Streaming Media, and Telecom. Each domain has its own production-grade schema with realistic data that mirrors how companies like Stripe, Uber, Netflix, Google, Airbnb, Meta, etc. structure their data — so you practice with the same patterns you'll encounter on the job.
We accept all major international credit and debit cards (Visa, Mastercard, Amex) via Razorpay. Prices are displayed in USD and INR.
Yes, completely free — no credit card required. A free account is needed for courses and practice problems so we can track your progress. You get 126 SQL questions, 124 Python questions, 5 visualizations per day, full access to interactive courses, Quick Recall interview cards, news, and blog articles. Upgrade to Pro only when you want access to 1,500+ questions across 15 industry domains, unlimited visualizations, and unlimited audio content.

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1,500+ questions across 15 industry domains, with visual query feedback on every solution.

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