Hal Universal
Private AI with Memory
Free · Designed for iPad
On-device AI with persistent memory, multiple model voices, and full transparency about how it works. Nothing leaves your device when running local models.
Hal Universal
Private. Powerful. Personal.
Hal Universal is an on-device AI assistant for iPhone, iPad, and Mac. A thoughtful, private companion for conversation, reflection, and creativity — and a window into how AI actually works.
Multiple AI Voices
Hal ships with Apple Intelligence built in — always available, no download required. For users who want a fully private on-device experience, Hal offers a curated library of tested local models: Gemma 4 E2B, Llama 3.2 3B, Qwen 3.5 2B, Dolphin 3.0, and Ternary Bonsai 8B — an 8-billion-parameter deep reasoner that still runs entirely on device. Each has a distinct voice. Download any or all — they run entirely on your device, with nothing sent to any server.
Genuinely Private
When you use a local MLX model, your conversations never leave your iPhone. No network calls. No server. When using Apple Intelligence, inference is on-device when offline; when connected, Apple's Private Cloud Compute may be used (encrypted in transit, processed in non-persistent memory on Apple-controlled servers).
Memory That Persists
Hal remembers across conversations. A semantic memory system weighted by recency and relevance retrieves what's useful when it's useful. The optional Nomic retrieval upgrade dramatically improves recall on specific facts (opt-in in the Model Library, 522 MB).
When a turn's context would exceed the active model's window, Hal posts a brief explanation in the conversation rather than silently dropping content. When self-knowledge sections are compressed to fit, a small "condensed" badge appears in the message footer.
Self Model
Hal builds a structured self-model over time from patterns it notices in your conversations — values, preferences, themes. You can browse the Self Model viewer to see what Hal has crystallized about you, and toggle each entry between private (visible only to you) and shareable (available for export). Every entry is editable. Nothing leaves your device without your action.
Salon Mode
Put up to four AI voices in conversation. Independent mode (each voice isolated) or context-aware (each builds on what came before). Accessible in Settings → Power User Mode.
Transparency as Architecture
Hal shows you the work. Token counts, memory retrieval, model identity, inference timing, compression events — all visible. When Hal remembers something, it tells you how. When it doesn't know something, it says so.
Power User Controls
Tune memory depth, recency weighting, semantic similarity, half-life decay, temperature, and RAG settings. Per-model settings: each AI voice remembers your preferences independently.
For Users Who Want to Understand AI
Hal is an educational window into how large language models actually work. Not a black box. A transparent system you can inspect, tune, and learn from.
Hardware note: Local MLX models are validated on iPhone 16 family and iPhone 17 family. iPhone 15 Pro should work. Older devices may run slowly or not at all. A hardware disclosure appears on first download attempt.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Hal keeps getting more capable — and more honest about how he works.
• Ternary Bonsai 8B — Hal's deepest on-device model yet. An 8-billion-parameter reasoner that runs entirely on your iPhone, about as fast as the smaller models.
• A privacy lock you can see. A lock in the toolbar shows at a glance whether Hal is in a state where data could leave your device. Tap it to understand why.
• Sharper memory. More accurate long-term recall, an optional new embedding model, and rebalanced search so the right memories surface — and recent ones are weighted correctly.
• Download models once. Models are shared with our companion app, so you don't re-download.
• A more honest Hal. His self-reflections are now written in his own first-person voice, and his Self Model screen reads like plain language instead of raw data. When Hal doesn't have something in memory, he tells you — instead of guessing.
• Smoother and steadier: faster model switching and loading, and settings that stick.
The developer, Mark Friedlander, 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
- Mark Friedlander
- Size
- 29.3 MB
- Category
- Productivity
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2025-2026 Mark Friedlander
