Apps. On us.
Useful little things we built and gave away. A Nirvani production. Open the URL, use the app. No installs, no accounts, no catch.
Live and shipping.
TERRA v 1.0
Run the numbers before you sign.
A real estate decision engine. Find what you can actually afford, see the year buying beats renting, and underwrite a rental with cap rate, cash-on-cash, DSCR, and a thirty-year proforma. No sign-up.
Chess v 1.0
Think three moves ahead.
A full chess studio. Play a real engine across three strengths or a friend on one board, then sharpen with tactics puzzles, opening theory, and the immortal games. Complete rules engine with FEN and PGN.
Periodic Table v PRO
The chemistry reference, weaponized.
All 118 elements with full data sheets, plus 11 calculators for molar mass, stoichiometry, gas laws, equilibrium, kinetics, thermodynamics, and more. Single-file PRO build. Loads instantly.
Lab Notebook v 0.8
One reaction. Every analysis.
A working chemist's notebook in a single page. Define a reaction once, and every analysis layer in the app pulls from it: stoichiometry, yield, mechanism, spectra, kinetics. The thread holds.
Aether v 1.0
Compose with gravity.
A musical physics sandbox. Drop stars, give them velocity, watch them orbit. A rotating sweep line plays each body as it passes, turning orbital mechanics into ambient music. 8 scales, 4 gravity modes, infinite compositions.
Astrology v 1.0
Read the sky you were born under.
A natal chart generator with real ephemeris math. Enter your birth date, time, and place. See your planets, houses, and aspects drawn on a luminous zodiac wheel. Tap any glyph for interpretation. 6 famous charts preloaded.
GED Prep v 2.0
Walk in ready.
300+ practice questions across the four GED subjects, 32 lessons that teach, a built-in calculator, formula sheet, test day strategies, achievements, study plans, and TTS. Tracks your scores and surfaces weak topics. Free, forever.
Macro Economics v 1.0
The big picture.
A free macro economics course. Ten lessons on GDP, inflation, unemployment, fiscal and monetary policy, business cycles, and schools of thought. 150+ practice questions, deep concept dives, case studies of major recessions, and interactive GDP, inflation, and money-multiplier calculators.
Micro Economics v 1.0
How markets actually work.
A free micro economics course. Supply and demand. Elasticity. Consumer choice. Production costs. Market structures from perfect competition to monopoly. Game theory. Externalities. Behavioral economics. With 100+ practice questions, deep concept explainers, and a rich glossary.
Biology v 1.0
Life, broken down.
A free biology course. Cells, DNA, evolution, genetics, photosynthesis, the human body, ecosystems, CRISPR. 150+ practice questions with explanations, deep concept dives on the double helix, mitochondria, and natural selection. Interactive Punnett-square solver, Hardy-Weinberg calculator, and DNA codon translator.
Geology v 1.0
Earth, read closely.
A free geology course. Plate tectonics, rock cycle, minerals, volcanoes, earthquakes, geologic time, fossils, climate. 150+ practice questions with explanations, deep concept dives on the asteroid that killed the dinosaurs, the missing mechanism Wegener lacked, and how we know what is inside Earth. Interactive Mohs hardness identifier, magnitude calculator, and radiometric dating tools.
Geography v 1.0
The world, in one map.
An interactive atlas of every country on Earth. Click any country for capital, population, area, languages, currency, and flag. Color overlays for population, GDP, area, and continent. Ten lessons across continents, climate, borders, languages, religions, and economic geography. 150+ practice questions. Distance, time zone, and coordinate calculators.
Algebra v 1.0
Solve for x.
A free algebra course. Variables, linear equations, inequalities, functions, polynomials, factoring, quadratics, exponents, rationals. 150+ practice problems with worked solutions, deep concept dives on FOIL, completing the square, the discriminant. Interactive quadratic formula solver, slope calculator, distance formula, system solver, and Pythagorean tool.
Engineering v 1.0
How things are made.
A free engineering survey. Statics, materials, dynamics, thermodynamics, fluids, electrical, control, manufacturing, civil, software. 80 famous problems with solutions, 100+ design principles, deep dives on stress and strain, the second law, control loops, manufacturing tolerance. Interactive beam solver, Ohm calculator, Reynolds tool, factor of safety estimator. Glossary of 80 terms across every discipline.
International Marketing v 1.0
Brand the world.
A free international marketing course. Foundations, cross-cultural consumer behavior, market entry, global branding, pricing, distribution, advertising, digital, regulation. 150+ scenario questions, deep concept dives, glossary of 90 terms. Interactive Hofstede comparator, PPP calculator, market sizer, brand equity scorecard, entry mode recommender.
Global Business v 1.0
Business across borders.
A free global business course. International trade, FDI, multinationals, trade agreements, currency, supply chains, strategy, geopolitics, sustainability, the future. 150+ scenario questions, 90 glossary terms. Interactive trade balance, FX impact, country risk, comparative advantage, supply chain visibility, and entry mode tools.
Financial Planning v 1.0
Money over a lifetime.
A free financial planning course. Budgeting, saving, investing, debt, insurance, retirement, taxes, estate planning, behavioral finance, the future. 150+ scenario questions, deep concept dives, glossary of 90 terms. Interactive compound interest, retirement target, debt payoff, mortgage, savings rate, asset allocation, inflation, tax savings tools.
Accounting v 1.0
The language of business.
A free accounting course. Bookkeeping, GAAP, balance sheet, income statement, cash flow, accruals, audit, tax, cost accounting, the future. 150+ scenario questions, deep concept dives, glossary of 90 terms. Interactive ratio analyzer, depreciation calculator, inventory valuation, working capital, break-even, ROA/ROE, gross margin, and effective tax rate tools.
Gridiron Elite v 1.0
Win the day, coach.
The complete coaching command center for elite American football programs. 53-man roster with positional health, biometrics, and a college breakdown. 12-week periodized practice plans. 17-game schedule with weather, travel, and scouting. 32 agility drills with diagrams, focus areas, and progression notes. Position-based macro targets, full meal plans, hydration protocol, supplement stack. Strength and conditioning library plus HRV, sleep, and resting-HR trends.
Time Pieces v 1.0
Mechanical artistry on the wrist.
A complete field guide to fine watchmaking. The Holy Trinity profiled in depth, 32 iconic references with full spec sheets, 30 complications explained, 12 case materials, an auction-record table, a 26-entry timeline from 1505 to today, and a 72-term glossary. With a live beating mechanical movement you can throttle from 18,000 to 72,000 vibrations per hour.
Diamonds v 1.0
The science of light.
A complete field guide to the world's hardest material and its strangest market. The 4Cs, geology, anatomy, famous stones, lab-grown versus natural, and the long history of engineered scarcity. 60+ legendary diamonds, 200+ glossary terms, and live comparators for cut, color, clarity, and carat.
Kinesiology v 1.0
The science of human movement.
A free course on how the body moves, from the planes of motion to the sliding filaments inside a single muscle fiber. Twelve lessons, a movement atlas of 50+ muscles, more than two dozen movement breakdowns, and working calculators for one-rep max, heart-rate zones, and leverage. 130+ practice questions with an explanation after every answer.
Wine v 1.0
A Sommelier Preparation Resource.
Production-grade exam prep for the Court of Master Sommeliers and WSET: certification pathways, a full deductive tasting scorecard, spaced-repetition flashcards, timed mock exams, service and floor training, and cram sheets. Plus 30 lessons, a 170+ grape and 85 region atlas, an interactive Studio, and 400+ questions. Built for fine-dining teams.
Diet v 1.0
The science of eating well.
A free course on how food becomes you, from the calorie to the gut microbiome. 22 lessons, a nutrition atlas of 75+ foods, more than 25 plate and label breakdowns, and working calculators for energy needs, macros, calorie goals, protein, BMI, and hydration. 170+ practice questions with an explanation after every answer.
Arabic v 1.0
Learn Modern Standard Arabic from zero.
The full alphabet in all four joining forms, 3,300+ words across 42 themes, 24 grammar lessons, the ten verb forms fully conjugated, plus dialogues, idioms, and proverbs. Native audio, spaced-repetition flashcards, quizzes, and an on-screen Arabic keyboard. The first of many languages.
Gems v 1.0
Light, locked in stone.
An interactive codex of the mineral kingdom. 72 gemstones with real gemological data, the Mohs hardness scale you can scratch through, the seven crystal systems, and every optical trick from asterism to opal fire. Birthstones, legendary stones, a 144-term glossary, and a gemologist's quiz.
Redline v 1.0
The automotive universe, fully loaded.
Drive any of 440+ iconic cars in an arcade simulator with synthesized engine sound, real power-to-weight physics, and a live tacho. Then dig into full specs, a 0 to 60 drag race, a 12-engine sound lab, an anatomy explorer, 140 years of history, and a 350-term glossary.
Cost of Doing Nothing v 1.0
The revenue leak you never measured.
A free calculator that adds up what missed calls, slow replies, dropped follow-ups, and no-shows cost you every year. Conservative math, every assumption sourced, your number in 60 seconds.
Capital v 1.0
Venture and buyout, decoded.
A free course on how private markets actually work. Twelve plain-English lessons on fund structure, the J-curve, carried interest, IRR versus MOIC, leveraged buyouts, cap tables, exits, private credit, and the LP view. A deep scenario question bank, a searchable glossary, and eight interactive tools: carry waterfall, LBO engine, dilution, fund returns, and more.
Hydration v 1.0
Your water, measured.
Compute your personal daily water target from weight, activity, climate and life stage, then log every glass and watch a live fill rise all day. Includes a 40-drink hydration index, an electrolyte planner, a sweat-rate tool, the urine colour chart, and deep dives on the science. Saved on your device, no account needed.
Caffeine v 1.0
Know your dose.
Track caffeine in your bloodstream in real time and watch the decay curve rise and fall. Find your personal sleep cutoff, calculate your safe daily limit, log from a 40-plus drink database, and learn the full science from half-life to withdrawal. Saved on your device, no account needed.
Law of Vibration v 1.0
Everything moves. Nothing rests.
Play a real frequency and watch sound scatter light into living cymatics patterns, the way sand leaps into geometry on a vibrating plate. A Web Audio instrument and an honest tour of the Law of Vibration, from Chladni figures to the nine Solfeggio tones.
Cause & Effect v 1.0
Nothing happens without a reason.
Touch a causal field and watch effects cascade, each one becoming a cause of its own. A deep, interactive field guide to the Law of Cause and Effect, from Aristotle's four causes and Hume's challenge to karma, chaos, Pearl's ladder, and the fallacies that fool us. Thirty-three chapters, six live engines.
Law of Attraction v 1.0
Attention is the practice.
A manifestation studio built on one idea: what you hold your attention on tends to grow. Study the twelve universal laws, run the affirmation engine, keep a gratitude streak, and work the 369 method, with an honest section on what the science actually supports. Six live tools, no hype.
Founder v 2.0
Build something people want.
The complete entrepreneurship masterclass. 36 lessons from idea to exit, plus 36 interactive business calculators with live charts, runway, LTV and CAC, NPV, dilution, cap tables, the Rule of 40, and more. A 748-question drill bank, a 1,300-term glossary, and 120 founder case studies. The deepest founder resource on the menu.
One platform. Many surfaces.
Every app on this page runs on the same Nirvani spine. Same auth, same data layer, same telemetry. We ship surfaces, not silos. Each tool is a single-file build that loads in under a second and works offline-first.
What should we build next?
Tell us what tool you wish existed. One paragraph, plain English, no formality. If it can ship in a week, it probably will.