Both WhatsApp and LINE have 50+ million Thai users. They're not the same audience. Picking the wrong one as your primary marketing channel means investing in a tool your customers don't open.
Here's how we think about the choice for Thai businesses.
LINE — the local default
LINE is the dominant messaging app for purely-Thai-market businesses. Adoption is essentially universal among Thai nationals; opening LINE is part of the morning routine for most adults under 60.
LINE wins when: - Your customers are 95%+ Thai nationals - You serve a B2C audience locally (restaurants, retail, services, beauty, fitness) - You need broadcast capability for offers, events, holiday wishes - You want LINE Official Account (OA) features like rich menu, auto-reply chatbots, integrated coupons - Your target demo is 30+ (older Thai customers strongly prefer LINE)
LINE friction points: - International customers (expats, tourists, B2B partners abroad) often don't have LINE installed - The OA monthly fee structure scales with broadcast volume — can get expensive for large lists - Search visibility is lower than WhatsApp for international queries
WhatsApp — the international + B2B default
WhatsApp is the dominant channel for anything cross-border or B2B. The Bangkok expat community, business travellers, international clients, and increasingly Thai under-30 power users all live on WhatsApp.
WhatsApp wins when: - Your customers include international visitors (tourism, hospitality, real estate for foreign buyers) - You serve B2B (especially anyone selling to multinational companies, MNC procurement teams, or export markets) - You need cross-border lead capture (form-to-WhatsApp integration is universal) - Your audience skews younger (under-30 Thai users now use both, with WhatsApp growing fastest) - You want the WhatsApp Business API for chatbots, broadcasts, and CRM integration
WhatsApp friction points: - Lower adoption than LINE among older Thai nationals (50+) - WhatsApp Business API has higher setup complexity than LINE OA - WhatsApp's "chat first" model means buyers can't easily browse a catalog before contacting (LINE has rich menu for this)
The combined approach (most Thai B2B)
For most Thai businesses with any meaningful international or B2B audience, the right answer is both:
- LINE OA as the local channel — broadcasts, loyalty, recurring customer engagement
- WhatsApp Business as the cross-border + first-contact channel — lead capture, B2B sales, international support
- Same content team handles both inboxes; same CRM logs both threads
This dual-channel setup is what we run ourselves at Backlink Hut and what we recommend for any client with an audience mix.
What about email?
Email open rates in Thailand B2C: 12-18%. Thai email behaviour is fundamentally different from US/EU — people use email for transactional notifications (bank statements, order confirmations) but not for relationship nurture or content.
Email still works for B2B where the buyer is checking professional inboxes daily. For B2C Thai market, email is mostly dead. Your nurture campaigns belong on LINE or WhatsApp.
What about Messenger?
Facebook Messenger had a moment in 2019-2021. It's now declining sharply in Thailand as users move to LINE (for local) and WhatsApp (for international). We don't recommend new messaging investment in Messenger unless your audience is specifically discovered through Facebook Ads — in which case Messenger is just the Facebook ads inbox, not a primary channel.
The decision tree
If you're choosing one to start with:
- Primarily Thai B2C customers, 30+ demographic → LINE OA first
- B2B + Thai SME audience → WhatsApp Business first
- International / cross-border focus (hospitality, real estate, travel) → WhatsApp Business first
- Younger Thai (under 30), retail / lifestyle → Both, with LINE as the lead
- Mixed Thai national + expat audience (Pattaya, Phuket, Sukhumvit) → Both, with WhatsApp slightly favoured for first contact
Setup essentials (whichever you pick)
The same five things matter on both platforms:
1. Verified business profile — green tick on WhatsApp, certified badge on LINE OA. Builds trust at first contact. 2. Auto-response for off-hours — never leave a first message unanswered overnight. "Thanks for reaching out, our team replies between 9am-6pm Thailand time" beats silence. 3. Chatbot for the top 5 FAQs — pricing, hours, location, services, how to book. Your team should never answer these manually after month one. 4. Catalog or rich menu — let customers browse without messaging first. LINE rich menu is exceptional for this; WhatsApp catalog is functional. 5. CRM integration — every conversation logs to a customer record. Without this, the channel produces leads you forget.
What we set up for clients
Our standard messaging-channel setup (single channel):
- Verified business profile + brand assets
- Catalog / rich menu populated with up to 30 products/services
- 3-5 auto-response flows for common questions
- Broadcast list segmentation (by location, last purchase, engagement)
- CRM integration with your existing customer database
- Monthly performance report — open rates, response times, conversion to sale
Typical setup time: 2-3 weeks. Typical ongoing management retainer: ฿8,000-15,000/month depending on broadcast volume.