SwiftAI – open-source library to easily build LLM features on iOS/macOS
We built SwiftAI, an open-source Swift library that lets you use Apple’s on-device LLMs when available (Apple opened access in June), and fall back to a cloud model when they aren’t available — all without duplicating code. SwiftAI gives you: - A single, model-agnostic API - An agent/tool loop - Strongly-typed structured outputs - Optional chat state Backstory: We started experimenting with Apple’s local models because they’re free (no API calls), private, and work offline. The problem: not all devices support them (older iPhones, Apple Intelligence disabled, low battery, etc.). That…
SwiftAI – open-source library to easily build LLM features on iOS/macOS launched on August 28, 2025 with 74 votes, #448 of 8,530 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 1 year on.
In plain words
SwiftAI is an open-source Swift library for iOS and macOS that enables developers to build language model features using Apple's on-device LLMs when available, with automatic fallback to cloud models on unsupported devices. It provides a single model-agnostic API, an agent/tool loop, strongly-typed structured outputs, and optional chat state management, eliminating the need for duplicate code across different model implementations. This approach leverages free, private, offline on-device processing while maintaining compatibility across the Apple ecosystem.
written from the facts on this page · September 2026
From the sources
Build beautiful and reliable LLM apps on iOS and MacOS - mi12labs/SwiftAI
In the maker’s words, at launch
We built SwiftAI, an open-source Swift library that lets you use Apple’s on-device LLMs when available (Apple opened access in June), and fall back to a cloud model when they aren’t available — all without duplicating code. SwiftAI gives you: - A single, model-agnostic API - An agent/tool loop - Strongly-typed…
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