Illustrate GPT vs QuizLLM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Illustrate GPT
Explore the inner workings of AI language models with a compact GPT model on your iOS device. Generate stories, visualize predictions, and understand AI's attention mechanisms. Ideal for AI enthusiasts and curious learners.
- Pocket-sized AI model
- Interactive story generation
- Next token prediction exploration
- Attention visualization (Pro)
- Model insights and visualizations
- Customizable generation settings
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How does ChatGPT actually write? Illustrate GPT answers that question with a real language model running entirely on your iPhone. You don't just read about it: you open it up and watch it think. Illustrate GPT runs Baby Llama 2, a tiny GPT trained on children's stories. It has the same architecture as the big models, small enough to run offline in real time. Eight short interactive chapters take you from raw text to the next word, and every chart comes from the live model. THE COURSE 1. Meet Baby GPT. Watch a story being written one token at a time. Each word is colored by how confident the model was. Tap any word to see the alternatives it considered, and pick a different one to rewrite the story from that point. 2. Tokens. Type anything and see how it gets chopped into pieces and turned into numbers. Find out why " cat", "Cat" and " CAT" are different things to a model. 3. Embeddings. Every token is a list of 288 numbers. See a word's vector, find its nearest neighbors (king → queen, prince, crown), and measure how similar two words are. 4. Attention. Tap a word and see which earlier words it looks at. Explore all 36 attention heads. Each one's role (previous-token, duplicate-token, attention sink, and more) is detected automatically. 5. Layers. Use the "logit lens" to watch the prediction take shape block by block, from a vague guess at the bottom to a confident answer at the top. Then browse the full model blueprint with real weight shapes. 6. Sampling. Turn the temperature, top-k and top-p knobs and watch the probabilities change in real time. Roll the dice, and write three different futures from the same sentence. 7. The Loop. Step through the whole pipeline for a single token, from tokenize and embed through 6 transformer blocks to probabilities, sample and append, then do it again. 8. Your Turn. Now you are the model. Guess the most likely next word and see how your intuition compares with a neural network. BUILT FOR LEARNING • Every chapter starts with a "predict first" question, so you form a guess before you see the answer. • Key ideas, common myths vs. reality, and an optional "Go deeper" section in every chapter. • Your progress is saved, so you can learn at your own pace. PRIVATE AND OFFLINE The model runs on your device with Apple's MLX framework. No account, no server, no data leaves your phone. FREE Every feature is free. An optional tip supports development. Perfect for students, teachers, developers, and anyone curious about what's really going on inside AI.
QuizLLM
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Have you ever wanted to be quizzed on a topic you just learnt about , to calibrate how much you have understood about that topic ? Then , QuizLLM is the app for you ! Type in the topic or paragraphs related to the topic. Click ask ! Voila ! You are presented with intelligent questions about that topic or those paragraphs that test your comprehension and fact recalling ability ! Best part is QuizLLM uses Apple's OnDevice Foundation Models. So QuizLLM is entirely on device and works offline without the need for WiFi or Cellular connection ! Test yourself anywhere , anytime ! Thank you so much for considering QuizLLM ! I am committed to maintaining your trust and confidence in my apps. I want you to know that QuizLLM is a very simple app which doesn't collect data. App uses Apple's On Device foundation models only and queries happen offline. QuizLLM requires user to have opted into Apple Intelligence and turned it on in their device. Generative AI is experimental. It can make mistakes. Check important info. Thank you and I hope you enjoy my app !
Screenshots
Verdict
The clearest difference is in-app purchases: QuizLLM at none against Illustrate GPT's 1. QuizLLM also leads on update cadence (every 4 days vs every 3 months). Illustrate GPT's advantage is iOS requirement (17.6 vs 26.0). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Illustrate GPT sells 1 one-off in-app purchase. QuizLLM asks for nothing beyond the download.
Illustrate GPT ships an update every 3 months, QuizLLM every 4 days. The most recent releases landed on October 17, 2026 and October 28, 2026 respectively.
| Parameter | Illustrate GPT | QuizLLM |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 17.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 68 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | 一和 朱 | Siva Pari |
In-app purchases
Illustrate GPT
- PRO Mode$1.99
QuizLLM
No in-app purchases









