What this stack assumes
- Korea-domestic B2B customer focus
- 1–3 person team, post-seed
- Monthly SaaS budget KRW 200–300k
- Few English global customers yet
Core stack
**Support/CRM**: Channel.io (KakaoTalk + email + web unified inbox) **Email marketing**: Stibee (Korean consent templates baked in) **Team collab**: Swit or Dooray! free + Notion **Development**: GitHub + Linear + Cursor **Analytics**: GA4 + Naver Analytics + Microsoft Clarity **Payments**: TossPayments or PortOne **AI**: Claude Pro + ChatGPT Plus + Wrtn **Automation**: Make free → migrate to self-hosted n8n **Accounting/tax**: Tax-accountant delegation + Hometax **Docs**: Notion + Google Drive
Rough monthly cost
- Channel.io free → ~KRW 50–100k paid
- Stibee free tier
- Notion free / team $10
- Claude Pro $20 + ChatGPT $20
- Payment gateway per-transaction (no monthly)
- n8n Railway hosting $5–10
- Tax accountant KRW 100–150k/month
About KRW 250–400k/month total. Comfortably reaches Series A.
Scale-up points
- Team 3→10: Swit/Dooray paid + Flex (payroll + 4 insurances)
- Customer growth: Channel.io higher tier + more agents
- International: add Stripe + Intercom (keep Channel.io)
- Marketing push: HubSpot Starter (Korean support)
Pitfalls
- Sticking to Zapier: six-figure KRW/month once tasks grow. Prepare n8n early
- Operating without a tax accountant: quarterly cleanup nightmare
- Launching without a KakaoTalk channel: directly hits Korean customer churn
Optimized for "ship fast, validate fast." After Series A, swap only what needs swapping.