We Built 42 Free Data Tools. Here Is What People Actually Use.

Most side projects die in obscurity. You build something, post about it, get three likes, and move on. We wanted to see what happens when you build 42 tools at once and let the internet decide which ones matter.

Over the past few months, we shipped 42 free data tools at DropThe Studio — comparison engines, calculators, finders, and simulators. No paywalls. No sign-ups. No “enter your email to unlock results.” Each tool does one thing well, backed by a database of 2M+ entities covering companies, people, movies, games, crypto, universities, and more.

Here is what we learned about what people actually use — and what we built for nothing.

The Tools Nobody Expected to Care About

The Billionaire Spending Simulator was a joke. Built in an afternoon. Pick someone like Jeff Bezos or Elon Musk, spend their net worth on real items, watch the counter drain. It gets more repeat visitors than half our serious tools. People send it to friends. “I just bought 400 Ferraris with Bezos’s money” is apparently a conversation starter.

The Birthday Twin Finder matches you with famous people born on your exact date. Simple concept. Database of 1.5M+ people behind it. Users don’t just check themselves — they check their kids, their partners, their coworkers. Every birthday in the calendar is a reason to come back.

The Feelgood Movie Finder recommends films based on how you want to feel, not by genre. Hopeful? Nostalgic? Adventurous? It queries 200K+ movies scored by emotional impact. Netflix‘s algorithm optimizes for watch time. Ours optimizes for how you feel after the credits roll.

DropThe Data: The Billionaire Spending Simulator has the highest share rate of any tool in the Studio. The Feelgood Finder has the longest average session duration — users spend 4x longer browsing movies by mood than by genre.

Where Database-Backed Tools Win

Anyone can build a calculator. Not everyone can query 2M+ entities on the fly. That is the moat.

Country Compare puts any two nations side by side across GDP, life expectancy, internet speed, cost of living, and safety. We cover all 246 countries — not the top 50 that most comparison sites stop at. A user comparing Portugal against Japan gets the same depth as someone comparing the United States against Iceland.

City vs City does the same for 64,000+ cities. Rent, salary, quality of life, walkability. Digital nomads comparing Lisbon against Tokyo use this before picking their next base.

Company Compare pulls data on 20,000+ companies. Revenue, employees, founding year, headquarters. Want to compare Apple against Microsoft? Or Nvidia against Meta? Numbers, not opinions.

University Compare covers 27,000+ institutions. Tuition, acceptance rate, rankings. Parents making six-figure decisions about Harvard versus Stanford deserve better than a listicle.

Crypto Compare tracks 15,000+ tokens — Bitcoin, Ethereum, and thousands more. Market cap, volume, supply, price history. No shilling. Just data.

The Full Finance Stack

Nobody should need six different websites to plan their money. We built the full set:

• Compound Interest Calculator — what time does to money, visualized
• Mortgage Calculator — monthly payments, total interest, amortization schedule
• DCA Calculator — dollar-cost averaging simulation for any asset
• Stock Profit Calculator — quick P&L on trades
• Crypto Profit Calculator — same, for crypto
• Staking Rewards Calculator — estimate passive yield
• Net Worth Calculator — assets minus liabilities
• Student Loan Calculator — repayment timelines by rate
• Salary Calculator — gross to net, by country
• How Rich Am I? — your income versus the planet (this one humbles people fast)

Travel, Lifestyle, and Everything Else

For the nomads and the curious:

• Cost of Living — city-by-city breakdown
• Digital Nomad Cost Calculator — budget planning for remote workers
• Visa Checker — passport power and requirements between countries
• Time Zone Converter — for distributed teams
• Currency Converter — real-time rates

For the data-curious and creatively bored:

• Director Scorecard — any film director’s career, rated by the numbers
• Year in Movies — the best films of any year, ranked
• Binge Watch Calculator — how long to finish a series at your pace
• Streaming Finder — search across platforms by title
• Celebrity Net Worth — what the famous are worth
• YouTube Revenue Estimator — earnings from views
• Engagement Rate Calculator — social media metrics
• Domain Value Estimator — what your domain is worth
• SEO ROI Calculator — is your SEO spend paying off
• AI Cost Calculator — budget API spend for AI projects

And the quietly essential: GPA Calculator, BMI Calculator, Calorie Calculator, Sleep Calculator, Age Calculator, Percentage Calculator, Life Expectancy Calculator. These exist on ten thousand other sites. Ours are fast, clean, zero ads, zero pop-ups. Sometimes being the least annoying version of something is enough.

Five Things We Learned

1. Fun beats useful for discovery. Useful beats fun for retention. The Billionaire Spending Simulator gets shared on social media. The Compound Interest Calculator gets bookmarked. A toolkit needs both types to grow.

2. Database-backed tools have a moat. Anyone can build a BMI calculator in a weekend. Building a Country Compare tool that covers 246 countries with real economic, health, and infrastructure data requires a database of 2M+ entities. That is not a weekend project.

3. Zero friction matters more than features. No sign-ups. No email gates. No “create a free account to see your results.” The tool works immediately or people leave. We chose immediate.

4. Bundles increase session depth. We grouped tools into bundles for specific audiences — investors, students, travelers, bloggers, developers. Someone who came for one calculator stays to use three.

5. Build for the query, not the trend. “Compound interest calculator” gets searched every single day. “AI-powered compound interest assistant” does not. We built for the searches people already make.

DropThe Data: The finance tools account for the most total sessions. The comparison tools (country, city, university, company) account for the deepest sessions. The fun tools (billionaire spending, birthday twin) account for the most shares. Three different metrics, three different winners.

The internet has enough opinions. It needs more tools. All 42 are free at DropThe Studio.