Feature
Apple Intelligence
Diorama uses Apple Intelligence to summarize your coaching conversations on-device. When your iPhone supports Apple's on-device model, longer chats with Ray are compressed into a short running summary so context is kept without sending your conversation to a server.
Marcus, training through his late forties, liked talking through his week with Ray but hesitated at the idea of a health app shipping his messages off somewhere. When he learned the conversation summaries were built on his own device using Apple Intelligence, the hesitation eased. He kept the longer conversations going because the cost of having them had dropped to almost nothing.
Why it matters
Health and training conversations are personal, and the people who care most about that are often the people training for the long run. Running the summary on-device means your words stay on your phone — the privacy posture is the feature, not a footnote.
How Diorama uses this
Keep chatting with Ray across long sessions while Diorama quietly maintains an on-device summary of earlier context. Rely on that summary so Ray stays oriented to your history without re-sending the full conversation. Continue normally when the on-device model is unavailable — Diorama falls back gracefully rather than blocking the chat.
What you can do
As a conversation with Ray grows, Diorama uses Apple's on-device language model to fold older messages into a compact summary. This keeps the coach aware of where you have been — recent soreness, a race you mentioned, a sleep pattern — without re-transmitting the whole thread each turn.
Because the summarization runs through Apple Intelligence on the device itself, the conversation content used to build that summary does not leave your iPhone for this step. For an audience that weighs privacy before installing a health app, that is a deliberate design choice rather than a marketing line.
Notes and limitations
Availability is gated by Apple: the on-device model must be present and ready on your device. When it is not, Diorama keeps working and simply skips the on-device summary step.
The model compresses context — it does not replace clinical judgment, and it does not turn Diorama into a diagnostic tool. It helps the coach remember; it does not decide.
The science
Trust is a precondition for disclosure, and disclosure is what makes health tooling useful. Data minimization — processing information on the device that produced it rather than transmitting it — measurably lowers perceived privacy risk and supports more honest self-reporting. On-device inference aligns the technical architecture with that principle instead of asking users to take privacy on faith.
Limitations
On-device summarization requires a device and iOS version that support Apple's on-device model; older hardware falls back to non-summarized context. The on-device model summarizes conversation context only — it is not a medical advisor and does not diagnose. Summary quality depends on what you have shared; sparse conversations produce sparse summaries.
The most capable tool is the one you are willing to be honest with. When the machinery that remembers your story runs on the device in your pocket, candor costs less. That is the quiet point of doing this work on-device: not spectacle, but the freedom to use the thing fully.
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