Apps

Top 100s, Encyclopedias, Full Stack, FastAPI.

Single-file Claude artefacts, hosted Full Stack Next.js apps, and FastAPI services — all openable inside matsiems, or full-page in a new tab.

9 new releases in the latest collection
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KnowledgAI
NewTop 100

AI Bez Strachu Kraków

Spokojne, praktyczne lekcje AI dla seniorów — po polsku i po angielsku.

AI Bez Strachu.jsx
KnowledgAI
NewTop 100

Ilustrowana encyklopedia AI dla seniorów 75+

100 łagodnych rozdziałów. 10 przyjaznych tematów. AI w prostych słowach.

AI dla seniorow 75+.jsx
KnowledgAI
NewEncyclopedia

The Visual Encyclopaedia of AI for the Over-75s

100 gentle chapters. 10 friendly topics. AI made simple.

The Visual Encyclopaedia of AI for the Over-75s.jsx
Artefact
NewTop 100

Poland A History in 100 Scenes

Poland A History in 100 Scenes.jsx
Artefact
NewTop 100

The 100 Most Complicated Languages

The 100 Most Complicated Languages.jsx
Artefact
NewTop 100

The 100 Most Watched Events Ever

The 100 Most Watched Events Ever.jsx
Artefact
NewTop 100

The Top 100 Stoic Practices

The Top 100 Stoic Practices.jsx
Artefact
NewTop 100

The Top 100 Stoic Quotes

The Top 100 Stoic Quotes.jsx
Artefact
NewTop 100

The Trump 100

The Trump 100.jsx
Artefact
Top 100

American Ideas The Top 100

American Ideas The Top 100.jsx
Artefact
Top 100

American Ideas The Top 100 v2

American Ideas The Top 100 v2.jsx
Artefact
Top 100

Astronomy

Astronomy.jsx
AI Agents
Full Stack

CCA

Claude Certified Architect — dashboard, study guide, quiz runner and exam simulator for the Anthropic architect certification.

cca.matsiems.com
Artefact
Top 100

Cinema

Cinema.jsx
Artefact
Top 100

First Delegation

Claude Code Coaching Desktop.jsx
Artefact
Top 100

First Delegation

Claude Code Coaching.jsx
Artefact
Top 100

Football

Football.jsx
Artefact
Top 100

Football's Influence 100

Football's Influence 100.jsx
Artefact
Top 100

Geography

Geography.jsx
Artefact
Top 100

Harari in 100 Scenes

Harari in 100 Scenes.jsx
Artefact
Top 100

Humankind 100

Humankind 100.jsx
Artefact
Top 100

Modern Disasters 100

Modern Disasters 100.jsx
Artefact
Top 100

Poland

Poland.jsx
AI Agents
Full Stack

SociAI

Sorbonne L3 Sociology-of-AI course app — 26 classes with inline SVG diagrams, MCQ pool, timed exam runner, essay + review modes.

sociai.matsiems.com
Artefact
Top 100

The 100 Germans Who Shaped the World

The 100 Germans Who Shaped the World.jsx
Artefact
Top 100

The 100 Greatest Poles

The 100 Greatest Poles.jsx
Artefact
Top 100

The 2026 100

The 2026 100.jsx
Artefact
Top 100

The Animal Kingdom

The Animal Kingdom.jsx
Artefact
Top 100

The Belgium 100

The Belgium 100.jsx
Artefact
Top 100

The Context Window

The Context Window.jsx
Artefact
Top 100

The Cracovian Top 100

The Cracovian Top 100.jsx
Artefact
Top 100

The Flow 100

The Flow 100.jsx
Artefact
Top 100

The France 100

The France 100.jsx
Artefact
Top 100

The French 100

The French 100.jsx
Artefact
Top 100

The Funky Success Book

The Funky Success Book.jsx
Artefact
Top 100

The Harari 100 Big Ideas for Our Species

The Harari 100 Big Ideas for Our Species.jsx
Artefact
Top 100

The Human Story in 100

The Human Story in 100.jsx
Artefact
Top 100

The Krakow Top 100

The Krakow Top 100.jsx
Artefact
Top 100

The Painted 100

The Painted 100.jsx
Artefact
Top 100

The Painted Poland 100

The Painted Poland 100.jsx
Artefact
Top 100

The Poland 100

The Poland 100.jsx
Artefact
Top 100

The Sociology Top 100

The Sociology Top 100.jsx
Artefact
Top 100

The Top 100 Biases & Heuristics

The Top 100 Biases & Heuristics.jsx
Artefact
Top 100

The Top 100 British People

The Top 100 British People.jsx
Artefact
Top 100

The Top 100 Ideas of Harari

The Top 100 Ideas of Harari.jsx
Artefact
Top 100

The Top 100 Ideas of Harari v2

The Top 100 Ideas of Harari v2.jsx
Artefact
Top 100

The Top 100 Keys to Germany

The Top 100 Keys to Germany.jsx
Artefact
Top 100

The Top 100 Mental Moves

The Top 100 Mental Moves.jsx
Artefact
Top 100

The Top 100 Paintings of Britain

The Top 100 Paintings of Britain.jsx
Artefact
Top 100

The Top 100 Stoics

The Top 100 Stoics.jsx
Artefact
Top 100

The Top 100 Things That Made Britain

The Top 100 Things That Made Britain.jsx
Artefact
Top 100

The Top 100 Ways to Think Clearly

The Top 100 Ways to Think Clearly.jsx
Artefact
Top 100

The USA 100 What Made America

The USA 100 What Made America.jsx
Artefact
Top 100

The USA in 100 Paintings

The USA in 100 Paintings.jsx
KnowledgAI
Encyclopedia

The Visual Encyclopaedia of AI

100 chapters. 10 topics. Everything that matters.

The Visual Encyclopaedia of AI.jsx
KnowledgAI
Encyclopedia

The Visual Encyclopaedia of Poland

1,000 years of history. 10 ages. 100 chapters.

The Visual Encyclopaedia of Poland.jsx
Artefact
Encyclopedia

The Visual Encyclopaedia of Thinking

The Visual Encyclopaedia of Thinking.jsx
Artefact
Top 100

The World History 100

The World History 100.jsx
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