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← All ideas IDEA-149 5.9 sea-mainland health-companion emerging

Дневник денге в семье — день болезни, температура каждые 4 часа, симптомы. Подсказка по WHO-протоколу когда CBC+NS1, без диагноза.

Problem

В сезон денге (июнь-октябрь) тайские семьи и экспаты с детьми вручную ведут дневник температур на бумаге или в Notes — и каждый день паникуют 'когда идти на CBC + NS1?'. Денге даёт типичный курс 7-10 дней, тромбоциты падают на 4-6 день, но без структурированного дневника семья теряется. Существующая Know Dengue показывает только провинциальную эпидемиологию; нет домашнего трекера случая.

Audience

Семьи с детьми 0-12 в Бангкоке + Юге Таиланда (Phuket, Krabi, Koh Samui) в сезон июнь-октябрь + экспаты-родители 30-45 со страхом тропических болезней. TAM ~3M households в high-incidence провинциях, эффективная аудитория — те у кого ≥1 укус в неделю в сезон. WTP 99-149 THB one-time за per-illness tracker

Reasoning

Source signals

  • SIG-20260426-sea-mainland-health-companion-dengue-household-platelet-fever-tracker — "I wish there was a way to track which day of fever I'm on, when to retest platelets" + "any hospital can run CBC for 200-500 baht"

What we ship

**Core features (MVP)**

  • Per-illness episode: "Bo, started 12-Jun-2026", with 4-hourly temperature log (manual entry or push-reminder)
  • WHO-classification symptom checklist (no interpretation): rash, headache, retro-orbital pain, vomiting, gum bleeding, weakness
  • Day-of-illness counter: D3, D5, D7
  • Information-only protocol prompts: "Per WHO 2024, CBC + NS1 antigen recommended on D2-3. Platelets typically drop D4-6. For child <6yo, hospitalize if fever >38.5°C for >24h." — clearly framed as **public protocol info**, not personalized advice
  • Multi-member household episodes (mom + 2 kids sick simultaneously is normal in dengue season)
  • Hospital PDF: fever-curve chart + symptom timeline + medication log + provincial DDC dengue rate

**Primary user flow**

1. Discovery in pain moment: "daughter has 38.7°C, could this be dengue?" → Google "แอป ติดตาม ไข้ ลูก เดงกี"

2. Pain-resolving landing copy: "Day-by-day tracker for dengue episodes"

3. PWA install + one-time PromptPay purchase 99 THB (single moment of urgency = high one-time conversion)

4. 1-screen onboarding: add sick member → start D1

5. Every 4hrs push: "fever now?" → 1-tap save

6. On D3 push: "WHO recommends CBC+NS1 today; any hospital 200-1500 THB"

7. End of illness: hospital handout PDF

**What it looks like**

  • **Landing**: "ลูกไข้สูง... อาจเป็นเดงกี — เริ่มบันทึกวันต่อวัน" hero + fever-curve screenshot + CTA "ซื้อ 99 บาท ครั้งเดียว"
  • **Main screen**: large active-illness card "Bo D3 — last temp 38.4 at 14:00 — next reminder 18:00" + hourly fever-curve chart
  • **PDF output**: A4 fever-curve × days + symptom timeline + medication log + provincial DDC rate context

**MVP build plan (8 days)**

  • Day 1-2: Postgres schema (households, members, illness_episodes, temperature_logs, symptom_logs), FastAPI auth, PWA shell
  • Day 3-4: episode UI + 4-hourly Web Push reminder + WHO-protocol info copy library
  • Day 5: WeasyPrint PDF + DDC dengue-rate scraper for provincial epidemic context
  • Day 6: Stripe one-time + PromptPay 2C2P integration; 99 THB unlocks unlimited episodes
  • Day 7: Thai+English landing, deploy CF Pages + Railway
  • Day 8: SEO articles on realthailandguide-style expat blogs + Pantip-Health soft launch

Reasoning

Pain is **high, acutely seasonal, recurring annually**. The SIG quotes "I wish there was a way to track which day of fever I'm on, when to retest platelets" — repeated every rainy season. Know Dengue solves provincial epidemiology, not household case management. Western symptom apps are generic, no day-of-illness counter. Wedge: **per-episode dengue household tracker with TH localization**. No-AI guardrail makes regulatory simple. Build 8 days. **One-time monetization is uniquely fit**: dengue episode lasts 7-10 days → user pays in acute need (high conversion) but won't re-engage in low-incidence months → recurring subscription poorly matches. 99 THB one-time ≈ emergency-pharmacy price point, psychologically easy.

Quick competitive read

  • **Know Dengue (DDC gov, free)**: provincial epidemiology, not case tracking
  • **Bearable / Symple**: generic, no dengue-specific, no day-of-illness counter, EN-only
  • **CDC Dengue PDF fact sheet**: static, non-interactive
  • **Hospital websites (Bumrungrad, Samitivej)**: per-procedure info, not a tracking tool
  • **White space**: per-illness household tracker for tropical fevers with TH localization is unoccupied. ~0 direct competitors.

Initial pricing hypothesis

**One-time 99 THB** (~$2.80) PromptPay — unlocks unlimited illness episodes for 1 family. Alternative: 199 THB "family plan" with up to 6 members + 12-month export. One-time because dengue is acute-seasonal not chronic — recurring subscription mismatches the use case. After payment → permanent license, app keeps working in subsequent seasons.

Distribution hypothesis

1. **TH SEO**: "แอป เดงกี ครอบครัว" / "ไข้เดงกี เด็ก ติดตาม" — low-comp seasonal-intent keywords

2. **Pantip-Health forum** soft-launch in May (pre-season)

3. **realthailandguide / theThaiger / itsbetterinthailand** expat-blog placements — expat parents have high WTP for peace-of-mind

4. **Pediatrician + community-clinic partnerships** in Phuket, Krabi, Koh Samui (highest dengue rates) — QR-flyer in waiting rooms

5. **Reddit r/Thailand r/Bangkok** seasonal — June "is this dengue?" daily threads

Source signals (1)

  • SIG-20260426-sea-mainland-health-companion-dengue-household-platelet-fever-tracker