Plain vs SleekFlow

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	USD 35 / month with annual commitment $35 /month 1 seat + $35/additional seats. $35/month, billed yearly	Seat · 1 seat + $35/additional seats	Standalone · Fixed
Horizon	USD 299 / month with annual commitment $299 /month 3 seats + $99/additional seats. $299/month, billed yearly	Seat · 3 seats + $99/additional seats	Standalone · Fixed
Frontier	Contact sales Custom Flexible pricing suited for you	Other	Standalone · Contact sales

SleekFlow

See full pricing history

USD · US · source: sleekflow.io

Plan	Pricing	Charged by	Offer type
Pro	USD 109 / month with annual commitment US$ 109 /month US$ 1,668 US$ 1,308 (Billed yearly)	Flat · /month	Standalone · Fixed
Premium Highlighted	USD 279 / month with annual commitment US$ 279 /month US$ 4,188 US$ 3,348 (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.

Plain

Foundation

AI features Credits included: 2,000/mo

Included
Users User seats: Up to 5

Included
Channels Slack: 25 channels

Limited
Channels Email: 2 addresses

Limited
Channels In-app channels: Included
Channels Microsoft Teams: Excluded
Channels Discord: Excluded
AI features Ari AI agent: included

Included
AI features Sidekick AI assistant: Included
Extensibility Linear, Jira integrations: Included
Help Center Help Center, Knowledge Base: 1

Limited
Help Center Ask AI: 1

Limited
Help Center Customer inbox: 1

Limited
Data-driven support Customer cards: Included
Data-driven support Customer card realtime: 12h cache

Limited
Extensibility AI workflows: Up to 5

Limited
Onboarding Onboarding process: Self-serve

Included
Onboarding Plain support: Email + chat

Included
Extensibility SLAs and Business hours: Excluded
Extensibility Escalation paths: Excluded
Extensibility CRM integrations: Excluded
AI features Reporting themes: Excluded
AI features AI suggested responses: Excluded
Data-driven support Reporting: 7 days

Limited
AI features Lookup with Cursor: Excluded
Services and compliance SSO and SCIM: Excluded
Onboarding Dedicated CSM: Excluded

Horizon

AI features Credits included: 15,000/mo

Included
Users User seats: Up to 10

Included
Channels Slack: Unlimited

Included
Channels Email: 10 addresses

Limited
Channels Microsoft Teams: Included
Channels Discord: Excluded
Highlights Everything in Foundation: Included
Extensibility SLAs and Business hours: Included
Extensibility Escalation paths: Included
Extensibility CRM integrations: Included
AI features Reporting themes: Included
AI features AI suggested responses: Included
Onboarding Priority support via Slack: Included
Help Center Help Center, Knowledge Base: Unlimited

Included
Help Center Ask AI: Unlimited

Included
Help Center Customer inbox: Unlimited

Included
Extensibility Workflows: Unlimited

Included
Data-driven support Customer card realtime: 15s

Included
Data-driven support Reporting: All time

Included
Onboarding Onboarding process: Self-serve

Included
Onboarding Plain support: Slack, email + chat

Included
AI features Lookup with Cursor: Excluded
Services and compliance SSO and SCIM: Excluded
Onboarding Dedicated CSM: Excluded
Onboarding White glove onboarding: Excluded

Frontier

AI features Credits included: Custom

Included
Users User seats: Custom

Included
Channels Slack: Unlimited

Included
Channels Email: 25 addresses

Limited
Channels Discord channels: Included
Highlights Everything in Horizon: Included
AI features Lookup with Cursor: Included
Extensibility Custom workspaces: Included
Services and compliance Custom contracting: Included
Services and compliance Advanced security: Included
Services and compliance SSO and SCIM: Included
AI features Custom AI + bring your own agent: Included
Onboarding Dedicated CSM + white glove onboarding: Included
Onboarding Onboarding process: White glove

Included
Onboarding Plain support: Dedicated CSM

Included
Help Center Help Center, Knowledge Base: Unlimited

Included
Help Center Ask AI: Unlimited

Included
Help Center Customer inbox: Unlimited

Included
Extensibility Workflows: Unlimited

Included
Data-driven support Customer card realtime: 15s

Included
Data-driven support Reporting: All time

Included

SleekFlow

Pro

Key features Starts with 500 monthly active contacts: 500

Included
Key features Includes 10 user accounts: 10

Included
Key features AI Agents: Included
Key features Omnichannel Inbox: Included
Key features Broadcast Campaign: Included
Key features Automation Flow Builder: Included
Key features Shopify, Google Sheets & API integration: Included
Key features Basic analytics: Included
Key features Group onboarding sessions, email & 24/7 AI chat support: Included

Premium

Everything in Pro, plus Starts with 1000 monthly active contacts: 1000

Included
Everything in Pro, plus Includes 10 user accounts: 10

Included
Everything in Pro, plus AI agents with custom integrations: Included
Everything in Pro, plus HubSpot & Zoho integration: Included
Everything in Pro, plus Webhook integration: Included
Everything in Pro, plus Advanced analytics: Included
Everything in Pro, plus WhatsApp Flow: Included
Everything in Pro, plus Ticketing system: Included
Everything in Pro, plus Role-based access control: Included
Everything in Pro, plus 60-day dedicated onboarding: Included

Enterprise

Everything in Premium, plus Custom number of monthly active contacts: Custom

Included
Everything in Premium, plus Custom number of user accounts: Custom

Included
Everything in Premium, plus AI forward deployed services: Included
Everything in Premium, plus Salesforce integration: Included
Everything in Premium, plus PII data masking: Included
Everything in Premium, plus Multi-workspace: Included
Everything in Premium, plus Export SleekFlow conversations: Included
Everything in Premium, plus Enterprise SLAs: Included
Everything in Premium, plus Dedicated Customer Success Manager: 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.

Plain

September 21, 2026
Official pricing page
- Foundation: USD 35 / month with annual commitment
- Horizon: USD 299 / month with annual commitment
- Frontier: Contact sales
August 27, 2026
Official pricing page
- Foundation — default: USD 35 monthly · USD 35 / month with annual commitment

SleekFlow

September 21, 2026
Official pricing page
- Pro: USD 109 / month with annual commitment
- Premium: USD 279 / month with annual commitment
- Enterprise: Contact sales
August 27, 2026
Official pricing page
- Pro AI — Monthly: USD 99 monthly · USD 79 / month with annual commitment