KiotViet vs Sapo vs POS365 for service venues — which POS?

KiotViet is the broadest local POS; Sapo is strongest on e-commerce integration; POS365 is the lowest-cost entry. For service venues, the differentiator is rarely the POS — it's the retention layer you add on top, regardless of which one you pick.

Comparator framing: pick the tool that owns the layer you actually have the biggest problem in. Calendar problems → booking platform. Retention problems → loyalty layer. Vietnam-channel problems → local-first retention layer with Zalo OA + ZNS native.

In Vietnam specifically, Zalo OA is the dominant retention channel — read rates of 60–80% beat SMS (15–25%) and email (8–15%) by a wide margin. Any retention playbook that does not put Zalo OA as the default channel underperforms by 2–4×.

PEKO operationalises this as a loyalty layer that sits on top of an existing booking platform — Booksy, Fresha, Mindbody, KiotViet, or paper diaries — rather than replacing it. Onboarding for a small venue typically takes 3–5 days from contract to first automated message.