NerdBox
Human o11y (observability) for iPhone

NerdBox

Observability for the one production system you can't roll back: you. Small iPhone automations that export your telemetry and guard your calendar, shipping everything to storage you own.

  • No account
  • No servers
  • No analytics
  • iOS 17+
Join the TestFlight betaApp Store · Soon

Install TestFlight first, then open the invite on your iPhone.

NerdBox app icon: a husky peeking out of a cardboard box

Health Export

HealthKit → storage you own

Your body has been emitting metrics for years, and the Health app is the only dashboard. Health Export is the exporter: it copies Apple Health out as plain files you can query in a spreadsheet, a notebook, or hand to an AI assistant.

  • 188 metrics, 14 categories

    The same groups as the Health app, from activity and heart to sleep, cycle tracking and workouts with optional GPS routes. Opt in per metric; iOS asks for each one.

  • Bring your own storage

    iCloud Drive, Google Drive, or both. JSON Lines, CSV, or both. No vendor, no ingest bill, no retention policy but yours.

  • Backfill, then incremental

    The first run backfills your full history and resumes if interrupted. After that only new samples ship: daily, every 6 hours, or within the hour of new Health data while your iPhone is unlocked.

  • Daily rollups for long-term retention

    Raw samples land as one file per metric per month. Daily summaries downsample each metric into one file per year, so years of trends stay small.

  • AI hand-off New

    A ready-made prompt that tells an AI agent where your export lives and how to read it. Basically a runbook, except something actually reads it. NerdBox itself never sends your data anywhere.

NerdBox/Health/
├─ README.md   ← the schema docs
├─ manifest.json
├─ data/heart_rate/2026/2026-09.csv
├─ data/steps/2026/2026-09.jsonl
└─ summaries/daily/steps/2026.jsonl
Human o11y

Bring your own Grafana.

NerdBox stops at the export and the daily rollups. Dashboards and alerting are yours to build in whatever tool you like. You're on call for this one anyway.

groups:
  - name: human.rules
    rules:
      - alert: StepsBelowSLO
        expr: avg_over_time(steps_total[7d]) < 8000
        for: 3d
        labels:
          severity: page
          team: you
        annotations:
          runbook: "take the stairs"
Illustrative only. NerdBox writes files; it doesn't run queries or page anyone. Not medical advice either.

  • SLOs

    Pick a target for your daily steps. Spend the error budget on purpose.

  • Toil reduction

    Stop screenshotting the Health app to ask an AI about it.

  • Postmortems

    Blameless. Unless it was the third espresso.

Calendar Sync

webcal feed → iCloud calendar

Calendar subscriptions like clinic bookings, gym classes and school timetables are read-only replicas nobody routes traffic to: Maps, CarPlay and Siri ignore them. NerdBox promotes them to real iCloud events.

  • Any ICS feed

    Paste a webcal:// or https:// link. Each feed gets its own iCloud calendar, named and coloured as you like.

  • Drivable locations

    Each location is looked up in Maps, so iOS can offer directions, travel time and time-to-leave alerts.

  • Your notes on every event

    Add an alert and notes like parking or a door code to every upcoming event from a feed.

  • Eventually consistent

    Syncs about hourly in the background and when you open the app. Cancellations disappear; past appointments stay.

Block busy time New

personal calendar → work calendar

Personal appointments don't count toward your work free/busy, so colleagues schedule over your maintenance windows. NerdBox keeps a plain "Busy" block on your work calendar for each one.

A 2 PM dentist appointment becomes an untitled Busy block at work, with 15 minutes of travel on either side.

  • Nothing leaks

    Blocks carry no title, notes or location from the original event.

  • Travel buffer, weekdays only

    Add 15 or 30 minutes of travel around events with a location, and skip weekends if you like.

  • Follows your plans

    Blocks move and disappear as events change. Ones you edit by hand are left alone.

Private by design

Your data goes to your accounts. Nowhere else.

  • No NerdBox servers

    No account, no sign-up, no SaaS bill. No control plane, no data plane, nothing for your data to pass through.

  • Scoped Google access

    Drive access is limited to files NerdBox creates. It can't see anything else.

  • Read-only Health

    NerdBox reads Health data and never writes to it.

  • No tracking

    No ads, no tracking, no analytics.

Read the full privacy policy. NerdBox is a personal tool, not a medical product.

Try NerdBox

NerdBox is in beta. Join on TestFlight to get new tools first, and tell me what breaks.

Join the TestFlight betaApp Store · Soon

Install TestFlight first, then open the invite on your iPhone.