ImmerSIT
Sole Developer | Designer
Stress Inoculation Training on Apple Vision Pro
June 2026
ImmerSIT is a stress inoculation training system: repeated, controlled exposure to pressure builds tolerance for it. An athlete is placed inside an immersive high-pressure environment while a heart-rate chest strap streams their physiological response in real time, and a coach works from a tablet console — raising or lowering the intensity, then guiding the athlete back down. The measurement is what makes it trainable: the coach can see the athlete's stress response and the recovery as they happen, across multiple session histories.
Developed solo: two native Apple applications, a web console for coaches, and the supporting media delivery service.
ImmerSIT Dashboard (iPad)
The coach's telemetry and controls for administering stress inoculation training.
Live session: telemetry, intensity control, a breathing pacer, and the event log.
- Live heart rate and heart-rate-variability readouts streamed from a chest strap, with a continuously updating trend view and a plain-language stress indicator
- Controls to raise and lower the intensity of the athlete's environment, trigger specific cues, and manage playback; each taking effect in the headset within about a second
- A one-tap guided breathing exercise, mirrored on both devices so the coach can pace the athlete through it
- A live view of what the athlete is currently looking at
- Automatic, millisecond-accurate logging of every action taken during a session, plus coach notes
- After action report generation that aggregates logs, notes, and graphical visualizations of the session
- A guided preflight setup checklist and a structured session lifecycle: calibration, live scene, recovery, review
ImmerSIT (Apple Vision Pro)
The athlete's headset interface.
360° video: for scenarios that need to play in full surround around the athlete.
- Immersive video playback across several projection formats, including 360°, Apple Immersive Video, and 2D video with seamless transitions between scenes
- Spatially positioned audio, controllable independently of the picture
- A reactive guided breathing visual that responds to the athlete's live heart rate
- In-headset gesture controls, so the athlete retains agency without removing the device
SITAuthor (Web Console)
Athlete profile: baselines, cross-session trends, and full session history.
- Athlete, coach, and team management, with invitations, self-signup, and administration
- Authoring and publishing of the immersive content used in sessions
- Session history, cross-session trend analysis, and generated after action reports
- Video replay of a completed session, reviewable alongside the session's recorded data
Authenticated Media Delivery Service
- Resumable upload of multi-gigabyte training media
- Persistent storage of media and session replays, siloed per team with per-user access control
- Authorized delivery to client devices in the field
Built With
- Swift, SwiftUI, RealityKit, ARKit, Metal, SceneKit, AVFoundation, Swift Concurrency
- TypeScript, React, Next.js, PostgreSQL
- Plus supporting cloud and edge infrastructure
Scope of the Work
I designed and implemented each part, from first commit to final state:
- Real-time physiological signal processing and the stress-classification logic derived from it
- Immersive video rendering and scene management on Apple Vision Pro
- Real-time coordination between two devices over a local peer-to-peer link
- On-device video rendering and export of session replays
- Large-media upload, storage, authorization, and delivery
- Cloud application, data model, and reporting
- Product design, interaction design, and visual design across all three surfaces
- Written technical design specifications and implementation plans preceding each feature
This page written and published .
© 2026 Spencer Lin. All rights reserved.