Plain vs Thena

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

Thena

See full pricing history

USD · US · source: www.thena.ai

Plan	Pricing	Charged by	Offer type
Starter — Billed annually	USD 29 monthly · USD 29 / month with annual commitment Billed annually $29 /user/month	Seat · user/month	Standalone · Fixed

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

Thena

Starter — Billed annually

Highlights User seats: Up to 5

Included
Highlights Tickets per month: Up to 1,000

Included
Highlights Channels: Slack & email

Included
Highlights AI Features: AI ticket detection, AI ticket summaries, AI tagging, AI assistant

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

Thena

August 27, 2026 Source
- Starter — Billed annually: USD 29 monthly · USD 29 / month with annual commitment