April 3, 2026
Siri’s secret sibling escapes
Show HN: Apfel – The free AI already on your Mac
Dev unlocks Apple’s hidden Mac AI for everyone—comments split between hype and meh
TLDR: A dev tool called apfel cracks open Apple’s built‑in, offline Mac AI so anyone can use it from the command line or as a local server. Commenters love the no‑cloud freedom but bicker over OS support, small memory limits, chat quality, and whether it should be a sidekick to bigger AI models.
Apple hid a free, offline AI brain in your Mac—and one dev just let it out. Meet apfel, a tiny app that turns Apple’s on‑device model (the one powering Siri and writing tools) into a command line, a chat window, and even a faux‑OpenAI server. No cloud. No keys. Just your Mac flexing its Neural Engine. Cue the comment cage match.
The hottest take? “Cool tech, but don’t expect ChatGPT.” One user warned that Apple’s “AFM” models aren’t built for long, human‑style chats, so temper the hype. Another thread went full detective on compatibility drama, with folks asking if this only works on the next macOS (“Tahoe”) after someone on Sequoia hit a “model not found” wall. Meanwhile, the memory limit (the “context window,” aka how much it can remember at once) sparked real‑world questions: can it chew through giant logs, or will it forget halfway? Others dreamed bigger, plotting to make apfel a sidekick that pre‑processes code or text for cloud giants like Claude.
And because it’s the internet, there were detours: someone asked if Notes can handle huge notebooks, proving every thread has that one cousin. Still, the vibe is clear: apfel feels like Apple’s secret AI finally got a door—and the community is already jiggling every handle to see what breaks next.
Key Points
- •Starting with macOS 26 (Tahoe), Apple Silicon Macs include an on-device language model as part of Apple Intelligence.
- •Apple exposes the model via the FoundationModels Swift framework (SystemLanguageModel), with all inference on the Neural Engine and GPU.
- •Apple’s default use is limited to Siri, Writing Tools, and system features; there is no built-in CLI or HTTP endpoint.
- •apfel provides access via a CLI, an OpenAI-compatible HTTP server (Hummingbird), and an interactive chat interface.
- •apfel adds utilities such as JSON output, exit codes, file attachments, context trimming for a 4096-token window, token counting, and tool schema conversions.