← All ideas IDEA-102 7.0 us health-companion developed

The opposite of a fitness app. Warns you BEFORE you crash, then logs the crash that came two days later — so you can finally show your specialist what's really happening.

Problem

ME/CFS, long-COVID, and POTS patients need to stay below a personal HR ceiling (resting + 15bpm) to avoid post-exertional malaise — but mainstream Apple Watch / Fitbit apps reward step counts and gamify movement, the opposite of pacing. They miss spikes BEFORE crashes happen, can't log PEM episodes that hit 24-48h later, and have nothing structured to show their physiotherapist.

Audience

US adults with ME/CFS / long-COVID / POTS / fibromyalgia (typically 25-55, often women, often previously active and now energy-limited), who own an Apple Watch or Polar HR strap and have explicitly rejected mainstream fitness apps as harmful

Reasoning

Source signals

SIG-20260426-us-health-companion-cfs-heart-rate-pacing-threshold: "objective biofeedback is crucial [...] symptom-contingent pacing strategy using a wearable heart rate monitor"
SIG-20260426-us-health-companion-cfs-pem-warning-forecast: "3-Day Forecast: Plan ahead with a prognosis based on your HRV trends"

What we ship

**Core features (MVP)**

**Auto resting HR baseline**: first 7 days — auto-calc resting HR from morning sleep (Apple Health). Threshold = baseline + 15bpm (Workwell methodology — user can adjust).
**Threshold alerts**: HR > threshold 2+ min → haptic + voice "you're crossing your threshold" (NOT "stop now") — information, not command.
**Daily energy envelope dashboard**: horizontal bar "today's HR-minutes above threshold" + color zone (green-yellow-red). User decides what to do.
**PEM journal**: post-event log "today I crashed — what did I do 24-48h ago" with auto-overlay of HR data from past 72h. Visible: "you crossed threshold 2 days ago for 47 min — possible cause".
**3-day capacity hint (Pro)**: HRV trending ↓ 3 days → push "consider a lighter day tomorrow" — NOT "cancel your meeting". Decision input, not prescription.
**Specialist PDF (Pro)**: 30 days of threshold breaches + PEM episodes → 1-page PDF for physiotherapist / long-COVID specialist.
**Anti-features (critical)**: NO step counting, NO move rings, NO "you can do it!" messaging, NO AI predictions ("you'll crash"), NO diagnosis.

**Primary user flow**

1. Signup, pick: "ME/CFS / long COVID / POTS / fibromyalgia / not sure". Apple Health pairing.

2. 7-day baseline period — app silently collects resting HR.

3. Day 8 — "your threshold = 78bpm. Breach = 2 min in red zone." User can manually adjust.

4. Daily use: glanceable widget — HR-minutes today, tap → log PEM episode when crash hits.

5. Free: 30 days history + basic threshold. Pro $9.99/mo or $79/yr: unlimited history, 3-day HRV trend hint, specialist PDF.

**What it looks like**

**Landing**: "An app that wants you to do less." hero (radical anti-positioning). Quote: "I deleted Apple Fitness. This is what I needed."
**Main app screen**: thin horizontal bar — HR-minutes today. Below: large "I crashed" button.
**PEM journal entry**: timeline of last 72h overlaid with HR zones, prompt "what activity may have triggered this?".

**MVP build plan (10 days)**

Day 1-2: Postgres schema (hr_baselines, threshold_breaches, pem_episodes), FastAPI, Stripe.
Day 3-4: HealthKit web bridge (PWA workaround) + Polar Flow API integration.
Day 5-6: baseline calculation logic, threshold breach detection (rule-based, 2-min smoothing).
Day 7-8: PEM journal with auto-overlay HR data, 3-day HRV trend (simple moving avg).
Day 9: PDF generator, paywall.
Day 10: landing, deploy, launch on r/cfs / r/covidlonghaulers.

Reasoning

Dual pain from SIG-cfs-heart-rate (objective HR-threshold pacing — Workwell methodology — clinically validated; new apps PaceME/Visible/Pacing Guard all target this) + SIG-cfs-pem-warning (push-crash cycle — main disability vector, predictive 24-72h hints needed). Our product's wedge: radically anti-mainstream-fitness positioning + NO ML predictions (only rule-based thresholds + simple trend smoothing — which removes FDA SaMD risk per IDEA-047 lesson). Visible (~$10/mo, $5M raised) is well-positioned but requires proprietary chest-strap. PaceME is Apple Watch-only. Pacing Guard requires a paid chest-strap. Open lane: BYO-watch — Apple Watch + Polar + Garmin support out of the box. Regulatory-safe: thresholds are NOT medical-device alerts (we don't manage therapy, don't dose — just display user's own HR data + a threshold the user sets). PEM journal is the user's own log, not diagnosis.

Quick competitive read

**Visible** ($5M raised, $10-12/mo) — well-funded but requires proprietary chest strap; doesn't work with bare Apple Watch.
**PaceME** — Apple Watch only, hard-coded to one device.
**Pacing Guard** — voice-first but paid chest strap.
**Trackuility / MyPace / ClarityDTX CFS** — all young (2025-2026), narrow feature sets, none combine threshold alerts + 3-day forecast + PEM journal in one utility.
**Visible Plus** — no first-class PEM journal.
**White space**: medium-high (5+ direct entrants but none combine multi-device + free tier + specialist PDF). Score hint: competitive_pressure 4-5. Active growing market, not saturated.

Initial pricing hypothesis

Free: 30 days history + basic threshold alerts. Pro: $9.99/mo or $79/yr — unlimited history, 3-day HRV trend hint, specialist PDF, multi-device support, partner/family share. Slightly under Visible ($10-12/mo). High WTP: ME/CFS patients spend $2K-10K/yr on specialist visits + supplements, and a pacing tool that demonstrably reduces crashes is measurable value.

Distribution hypothesis

1) **r/cfs (250K+) + r/covidlonghaulers (180K+) + r/POTS** — solo-dev "Built this because Apple Fitness was making me sicker". Radical anti-positioning resonates.

2) **Workwell Foundation methodology mention** — outreach to Workwell for inclusion on their resources page (free Pro for verified ME/CFS support group members).

3) **Long-COVID specialist clinics** — outreach to 30+ post-COVID rehab clinics (Mount Sinai Center for Post-COVID Care, etc.) with free 6-month Pro for practice manager.

Source signals (4)

SIG-cfs-pem-warning
SIG-20260426-us-health-companion-cfs-pem-warning-forecast:
SIG-20260426-us-health-companion-cfs-heart-rate-pacing-threshold:
SIG-cfs-heart-rate

Score breakdown

market_size	6/10
pain_severity	7/10
build_feasibility	7/10
speed_to_revenue	7/10
regulatory_safety	5/10
competitive_pressure	9/10
recurring_revenue_fit	8/10

MVP stack

frontend	Cloudflare Pages + React + Tailwind (PWA — Apple Watch complication via webview-glanceable surface; Polar via Bluetooth strap WebBLE)
backend	Railway + FastAPI + Postgres
ai	none (deliberate — pure rule-based threshold logic, no ML predictions)
payments	Stripe Subscriptions
storage	Postgres
external_integrations	['Apple HealthKit (HR + HRV + sleep, read-only)', 'Polar Flow API', 'Stripe']

Estimated build: 10 days

Regulatory

soft_block

Blocks: D-006

SaMD-creep risk (D-006 soft) — HIGHEST risk in this batch: HR-threshold alerts on a wearable could be construed as a medical-device alarm if framed as treatment guidance. The IDEA explicitly mitigates this via (a) pure rule-based logic, no ML predictions, (b) information-not-command voice copy ("you're crossing your threshold", NOT "stop now"), (c) user manually adjusts threshold (Workwell methodology cited as user education, not clinical recommendation), (d) decision-input framing for 3-day HRV trend ("consider a lighter day", not "cancel your meeting"). These are correct mitigations, but the boundary is thin: any drift toward predictive ML, automatic activity-blocking, or "your symptoms suggest..." messaging would cross into FDA SaMD Class II territory (similar to consumer arrhythmia detection on Apple Watch which DID require 510(k) clearance). The product positioning as "anti-fitness" actually helps here — fitness trackers are FDA Wellness Exempt under General Wellness Policy (2019), and CFS pacing as wellness/lifestyle support stays under that umbrella as long as no clinical claims are made. Specialist PDF must say "user-supplied HR + PEM data, formatted for review", never "evidence of post-exertional malaise" or "indicates mitochondrial dysfunction". US regional advisory: HIPAA does NOT apply (B2C). HealthKit / Polar Flow API integrations: read-only is appropriate; do NOT write back to HealthKit (write-back would invoke FDA SaMD scrutiny on data quality). WA MHMDA covers HR/HRV/sleep/biometric-derived data as "consumer health data" — opt-in consent required. CFS/long-COVID is a federally recognized chronic disease (CDC + ME/CFS post-COVID program 2023+) — disability-claim PDF for SSDI / employer-accommodation framing is acceptable as user-prepared evidence. FTC Health Breach Notification Rule applies. BUILD RECOMMENDED with strict guardrails: (1) FDA General Wellness Policy compliance audit — copy review confirming NO clinical claims, NO disease-treatment framing, only "lifestyle pacing tool"; (2) onboarding disclaimer "this is a pacing aid, not a medical device — does not diagnose ME/CFS, long-COVID or POTS, and does not replace medical management"; (3) threshold-alert UX is information-only (no haptic-block of activity, no cancel-meeting auto-actions); (4) WA MHMDA consent + reproductive-irrelevant biometric handling; (5) Workwell methodology cited as user-facing education, not as clinical authority; (6) HRV trend hint copy audit (must remain "consider", never "must" / "should" / "stop").

Competitors (0)

No competitors profiled yet.