Letterbook 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.

Letterbook

See full pricing history

USD · US · source: www.letterbook.ai

Plan	Pricing	Charged by	Offer type
Starter — default	USD 50 monthly · USD 50 / month with annual commitment $50 per month	Flat · per month	Standalone · Fixed
Growth — default Highlighted	USD 200 monthly · USD 200 / month with annual commitment $200 per month	Flat · per month	Standalone · Fixed
Enterprise — default	Contact sales Let's talk per month	Flat · per month	Standalone · Contact sales

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)	Flat · /month	Standalone · Fixed
Growth Highlighted	USD 199 monthly · USD 159 / month with annual commitment $ 159 /month $2,388 $1,908/yr (billed yearly)	Flat · /month	Standalone · Fixed
Advanced	USD 349 monthly · USD 279 / month with annual commitment $ 279 /month $4,188 $3,348/yr (billed yearly)	Flat · /month	Standalone · Fixed
Enterprise	Contact sales Custom	Flat	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.

Letterbook

Starter — default

Highlights Seats: 3 seats

Included
Highlights Tickets per month: 300 tickets / month

Included
Highlights Integrations: Integrate your database & Stripe

Included
Highlights Inbox: Unified inbox for all your channels

Included

Growth — default

Highlights Seats: 10 seats

Included
Highlights Tickets per month: 1,000 tickets / month

Included
Highlights Channels and integrations: All channels and integrations

Included
Highlights Support: Priority support

Included

Enterprise — default

Highlights Seats: Custom seats

Included
Highlights Tickets per month: 3,000+ tickets / month

Included
Highlights Security: SSO & SAML

Included
Highlights Account management: Dedicated account manager

Included

Respond.io

Starter

Includes Team & Custom Inboxes: Included
Includes Mobile App: Included
Includes AI Prompt: Included
Includes AI Assist: Included
Includes Basic Reports: Included
Includes Two-Factor Authentication (2FA): Included
Includes Growth Widgets: Included
Usage Users: 5

Limited
Usage Monthly Active Contacts: Unlimited

Included
Usage AI Credits: 5,000

Included

Growth

Includes Broadcasts: Included
Includes Workflows automation: Included
Includes AI Agents: Included
Includes Advanced Reports: Included
Includes Zapier & Make Integrations: Included
Includes Developer API: Included
Usage Users: 10

Limited
Usage Monthly Active Contacts: Starts with 1,000

Limited
Usage AI Credits: Starts with 10,000

Included

Advanced

Includes Mask Phone Number & Email Address: Included
Includes Multiple Workspaces: Included
Includes HTTP Requests in Workflows: Included
Includes Incoming & Outgoing Webhooks: Included
Includes Single Sign-On (SSO): Included
Includes Custom Channels: Included
Usage Users: 10

Limited
Usage Monthly Active Contacts: Starts with 1,000

Limited
Usage AI Credits: Starts with 20,000

Included

Enterprise

Includes Unlimited Users: Unlimited

Included
Includes Higher limit of workspaces: Included
Includes Higher API rate limits: Included
Usage Monthly Active Contacts: Custom

Limited
Usage AI Credits: Starts with 40,000

Included

How their prices changed

Each date shows when a public price was observed, not when it took effect. An archived region or currency can differ, so a currency change is not necessarily a price increase.

Letterbook

August 27, 2026
Official pricing page
- Starter — default: USD 50 monthly · USD 50 / month with annual commitment
- Growth — default: USD 200 monthly · USD 200 / month with annual commitment
- Enterprise — default: Contact sales

Respond.io

September 21, 2026
Official pricing page
- 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 31, 2026
Official pricing page
- 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
Official pricing page
- 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
Official pricing page
- 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