Plain vs Respond.io
Side-by-side trajectory, velocity, and editorial themes.
Plain turns Sidekick from a drafting assistant into an agent that acts
Plain is a customer-support platform building an agentic layer — 'Sidekick' — into the core thread workflow. Recent releases moved Sidekick from suggesting to acting: it can take actions across connected tools, start working proactively the moment a thread matches a workflow, and it now answers in Slack. The surrounding plumbing (scheduled workflows, thread fields via the chat widget, machine-user API links to Linear) is all in service of more automation.
The arc points to autonomous, workflow-driven support: AI that investigates, summarizes, drafts, and executes before a human opens the thread. Each release widens either Sidekick's reach (Slack, connected tools) or the triggers that set it off (workflow conditions, schedules), steadily shifting the human role from doing the work to reviewing it.
Expect deeper Sidekick autonomy — more action types and likely approval or guardrail controls — plus more workflow triggers that launch automation without a human in the loop.
Respond.io absorbs WhatsApp's phone-free identity shift while thickening its AI agent.
Respond.io is deepening its WhatsApp-first messaging platform on two fronts: richer message formats (product carousels, custom templates) and a more capable AI Agent that now sends file attachments and understands conversation assignment. The headline change is support for WhatsApp usernames and Business-Scoped User IDs, letting contacts reach a business without sharing a phone number.
The platform is tracking Meta's channel evolution closely and building the CRM plumbing to match — contact identity is moving from phone numbers toward BSUIDs, with API and webhook support so integrations keep working. Alongside that, the AI Agent is steadily gaining context-awareness and media handling, pointing at more autonomous front-line conversation handling.
Expect respond.io to extend BSUID handling across more of its automation and reporting surfaces, and to keep expanding the AI Agent's autonomy as Meta's username rollout widens through 2026.
See more alternatives to Plain →
See more alternatives to Respond.io →