Завтра ван-пхра — мы напомним и предложим готовый набор подношений с доставкой по PromptPay. Каждый святой день — короткий audio-объяснение что и почему.

Source signals

• SIG-20260426-sea-mainland-hobbyist-utility-th-buddhist-altar-offerings: «notifications can be set 1, 2 or 3 days in advance — to prepare flowers, incense, candles»
• SIG-20260426-sea-mainland-hobbyist-utility-th-buddhist-calendar-info-gap: «Regrettably, not enough information... what is the name of each holiday and why is it a holiday?»

What we ship

**Core features (MVP)**

• Lunar calendar: wan-phra + Visakha/Asalha/Magha Bucha + other holidays with TH/EN/CN short explanations (200 words/day)
• LINE Notify reminders: "Tomorrow is wan-phra — prepare flowers and incense" (configurable 1/2/3 days ahead)
• Offering-set marketplace via Lazada/Shopee affiliate: "buy a wan-phra set" (candles + flowers + incense, Lazada delivery)
• Spirit-house (saan-phra-phum) daily reminder: morning notification for daily offerings (families/offices)
• Audio narrative per day: TTS "what and why" 60-sec explanations (TH/EN/CN)

**Primary user flow**

1. LINE Login → select tradition (Mahanikaya / Dhammayut) + spirit-house: yes/no

2. Enable reminders N days before each wan-phra

3. Morning of: open app, hear 60-sec audio, tap to order Lazada offering set

4. Premium upgrade for extended audio (10-min monk lecture in Thai)

**What it looks like**

• **Landing**: hero "ปฏิทินวันพระ พร้อมเตือน — รู้แล้ว ทำตาม สบายใจ" + sample audio screenshot + Lazada offerings preview
• **Main app screen**: today's status (regular / wan-phra in N days / wan-phra today) + audio player + offerings-shopping CTA
• **Calendar**: year view with wan-phra highlights + lunar phases

**MVP build plan (10 days)**

• Day 1-2: backend (Day/HolyDay/User models), import 5 years of lunar calendar
• Day 3-5: narrative content generation (Claude → 200 words/day for 50 unique days in TH/EN/CN), TTS
• Day 6-7: LINE Notify reminder cron + Lazada affiliate widget
• Day 8-10: landing (TH-first, EN/CN tabs), Play Store-style review marketing, deploy

Reasoning

Thailand Buddhist Calendar (1M+ Play Store installs) is the dominant solution, but its reviews repeat the same request: "not enough information on what each holiday is and why". The audience exists and pays ($4.99 iOS premium) — but is dissatisfied. Pain is not niche: 95% of TH population is Buddhist, wan-phra fires 4×/month = 48 events/year = high retention. Spirit-house (saan-phra-phum) at every office/home is a daily ritual = high ad-revenue potential. **white space on content-rich layer**: existing apps give dates only; nobody offers "meaning + audio + 1-click offering shopping". Stack ideal: Cloudflare Pages + Railway + LINE Notify + Lazada affiliate. Ad-supported as primary, premium audio as upsell.

Quick competitive read

• **Thailand Buddhist Calendar (TungYaaApp)** — 1M+ Play Store, basic (dates + bell), reviews demand more context.
• **Thai Buddhist Calendar (Apple, $4.99)** — premium, again dates only.
• **Calm / Headspace** — global mindfulness, doesn't cover Theravada/TH-specific holidays.
• **white space**: content-rich layer (audio narrative + 1-click Lazada offerings + spirit-house daily) in TH/EN/CN. 0 competitors with traction.

Initial pricing hypothesis

Free + ads (Lazada/Shopee affiliate 5-15% commission per offering set) — primary revenue. Premium 99 THB/mo or 690 THB/year for extended audio (10-min monk lecture), no ads, 3-device sync, family-pack (5 people). Ad-supported is optimal because the audience is massive (millions) but ARPU low — 4+ visits/month yields good CPM. Lazada affiliate is material side income.

Distribution hypothesis

1) ASO in Play Store/App Store: Thai SEO "ปฏิทินวันพระ", "วันพระ 2569"; 2) Facebook ads on Thai Buddhist audience (cohort 25-65, very targetable); 3) LINE OA channel "Daily wan-phra reminder"; 4) Partnership with Thai wat (temples) — "donate to wat X via PromptPay" button in app gives wat revenue + social trust; 5) Pantip thread in religious section.