LLM Builder Kit - Hands-On LLM
Build & Train Your Own AI LLM
$2.99 · Designed for iPad. Not verified for macOS.
Now with 10 chapters, quizzes, achievements, and a searchable glossary. Build, train, and compare your own language models — no coding required.
Ever wondered how AI chatbots like ChatGPT, Gemini, Claud actually work under the hood? LLM Wizard lets you build a real language model from scratch — on your phone.
Whether you're a curious beginner or a seasoned developer, this app walks you through every fundamental concept powering modern AI: tokenization, n-gram probabilities, training epochs, loss curves, temperature sampling, fine-tuning, and prompt engineering.
Learn Mode — 10 interactive chapters:
Understand how raw text becomes a trained model, step by step. Visualize attention weights, explore embeddings, and interact with a live language model as you learn. New in v2.0: chapters on Fine-Tuning & RLHF and Prompt Engineering take you all the way to how today's AI assistants are built.
Build Mode — 6-step wizard:
Choose your own domain (fairy tales, movie reviews, cooking, sports, poetry, and more — or paste your own text), configure your tokenizer and hyperparameters, watch your model train in real time, then generate text with your finished model. Save snapshots and compare two models side by side.
Test yourself:
Take a quiz after every chapter, unlock 12 achievements, and track your progress through the full curriculum.
Glossary:
50+ searchable definitions covering every LLM concept in the app — always one tap away.
No cloud. No API keys. Everything runs on-device.
Perfect for students, developers, educators, and anyone curious about how AI really works.
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Version 2.0 — the biggest update yet!
• 2 new chapters: Fine-Tuning & RLHF and Prompt Engineering
• Chapter quizzes — test your knowledge after every chapter
• 12 Achievements to unlock as you learn
• Glossary — searchable definitions for 50+ LLM terms
• Save & compare trained models side by side
• Use your own custom text to train the model
• Share generated text directly from the app
• First-launch onboarding tour
The developer, Yuhsiu Lai, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Yuhsiu Lai
- Size
- 5.2 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 iTech Tools
