How it plugs in
—Public API
NoOpen source
YesFree tier
Signal on Chat APIs6.1#17 of 32
TalkJS provides a chat API, SDKs, and pre-built user interfaces for adding messaging to apps and websites.

Pricing
- Basic$279 / month · 10,000 MAU included · $0.04 per additional MAU · 100 group chat participants · 300 guests · 1 webhook · office-hours chat support$279/mo
- Growth$569 / month · 25,000 MAU included · $0.03 per additional MAU · 300 group chat participants · 1,250 guests · 3 webhooks · priority chat and email support$569/mo
- EnterpriseCustomized · Custom MAU · customizable group chat size · priority phone, chat, and email support · on-premise/private cloud and private dedicated servers available as add-onsOn request
As talkjs.com lists them, checked 4 Oct 2026.