Plain vs Respond.io

See how their public offers line up before you choose your own position. Prices stay in the currency, billing schedule, and charged unit each vendor publishes.

Plain

See full pricing history

USD · US · source: www.plain.com

Plan	Pricing	Charged by	Offer type
Foundation — default	USD 35 monthly · USD 35 / month with annual commitment $35/month, billed yearly	Seat · $35 /month 1 seat + $35/additional seats start	Standalone · Fixed

Respond.io

See full pricing history

USD · US · source: respond.io

Plan	Pricing	Charged by	Offer type
Starter	USD 99 monthly · USD 79 / month with annual commitment $ 79 /month $1,188 $948/yr (billed yearly)	Unit · Monthly Active Contacts	Standalone · Fixed
Growth Highlighted	USD 199 monthly · USD 159 / month with annual commitment $ 159 /month $2,388 $1,908/yr (billed yearly)	Unit · Monthly Active Contacts	Standalone · Fixed
Advanced	USD 349 monthly · USD 279 / month with annual commitment $ 279 /month $4,188 $3,348/yr (billed yearly)	Unit · Monthly Active Contacts	Standalone · Fixed
Enterprise	Contact sales Custom	Unit · Monthly Active Contacts	Standalone · Contact sales

What each plan includes

Feature names follow each vendor’s own pricing page, so verify the wording before treating them as exact equivalents.

Plain

Foundation — default

Highlights User seats: 1 seat + $35/additional seats start

Included
AI features Credits included: 2,000/mo

Included
Highlights Channels: Slack, email, in-app channels

Included
AI features Ari AI agent: included

Included
Highlights Integrations: Linear, Jira integrations

Included
Highlights Help Center, Knowledge Base: included

Included
Highlights Customer cards: included

Included
AI features AI workflows: included

Included
AI features Sidekick AI assistant: included

Included
Highlights Support: Email + chat

Included

Respond.io

Starter

Usage Users: 5

Included
Usage Monthly Active Contacts: Unlimited

Included
Usage AI Credits: 5,000

Included
Inbox & Contacts Team & Custom Inboxes: Included
Inbox & Contacts Mobile App: Included
AI & Automation AI Prompt: Included
AI & Automation AI Assist: Included
Reports Basic Reports: Included
Platform & Security Two-Factor Authentication (2FA): Included
Integrations Growth Widgets: Included

Growth

Usage Users: 10

Included
Usage Monthly Active Contacts: Starts with 1,000

Included
Usage AI Credits: Starts with 10,000

Included
Broadcasts Broadcasts: Included
AI & Automation Workflows automation: Included
AI & Automation AI Agents: Included
Reports Advanced Reports: Included
Integrations Zapier & Make Integrations: Included
Integrations Developer API: Included

Advanced

Usage Users: 10

Included
Usage Monthly Active Contacts: Starts with 1,000

Included
Usage AI Credits: Starts with 20,000

Included
Platform & Security Mask Phone Number & Email Address: Included
Platform & Security Multiple Workspaces: Included
Integrations HTTP Requests in Workflows: Included
Integrations Incoming & Outgoing Webhooks: Included
Platform & Security Single Sign-On (SSO): Included
Channels Custom Channels: Included

Enterprise

Usage Users: Unlimited

Included
Usage Monthly Active Contacts: Custom

Included
Usage AI Credits: Starts with 40,000

Included
Highlights Unlimited Users: Included
Highlights Higher limit of workspaces: Included
Highlights Higher API rate limits: Included

How their prices changed

Each dated row shows the public prices observed when that vendor’s pricing page changed.

Plain

August 27, 2026 Source
- Foundation — default: USD 35 monthly · USD 35 / month with annual commitment

Respond.io

August 27, 2026 Source
- Starter: USD 99 monthly · USD 79 / month with annual commitment
- Growth: USD 199 monthly · USD 159 / month with annual commitment
- Advanced: USD 349 monthly · USD 279 / month with annual commitment
- Enterprise: Contact sales
August 27, 2026 Source
- starter — default: USD 79 monthly · USD 79 / month with annual commitment
- growth — default: USD 159 monthly · USD 159 / month with annual commitment
- advanced — default: USD 279 monthly · USD 279 / month with annual commitment