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Weft vs Plain

Both run B2B support out of Slack Connect and email. The differences are in price per seat, seat limits on the lower plans and how AI resolutions are billed.

Checked against public pages on November 10, 2026

The short answer

Plain and Weft solve the same problem: turning shared Slack channels and email into a support queue a team can actually run. Weft costs less per seat ($39 annual on Starter against Plain's $45 on Foundation), has no seat caps on its self-serve plans, and prices AI per resolved conversation in dollars rather than credits. Plain is the more established product and lists HIPAA support on its top plan. If you have more than five people replying, or want to try before you talk to sales, Weft's plans are the simpler fit.

Price and seats

WeftPlain
Entry planStarter: $39 per seat per month billed annually, or $49 monthlyFoundation: $45 per user per month, billed annually
Mid planGrowth: $89 per seat per month billed annually, or $109 monthlyHorizon: $99 per user per month, billed annually
Seat limitsNo seat caps on Starter or GrowthFoundation lists up to 5 member seats; Horizon a minimum of 3 and up to 10
Read-only teammatesFree. You pay only for people who reply to customersUnlimited viewer seats
Monthly billingYes, on Starter and GrowthThe pricing page lists annual billing
Free trial14 days with Growth features, no card needed to start7 days, no credit card required

AI

WeftPlain
Customer-facing agentCustomer Agent: answers with citations, hands off when unsureAri, Plain's customer-facing agent
How AI is billed$0.80 per conversation the agent resolves on its own. Drafts handed to a human are free. Or bring your own model keyCredits: Ari uses 100 credits per resolution. Foundation includes 1,000 credits a month, Horizon 2,500; extra credits are $10 per 1,000

Channels and platform

WeftPlain
ChannelsSlack Connect, Microsoft Teams, Discord, email and a chat widget in one queueSlack, email and in-app on Foundation; Microsoft Teams listed on Horizon; Discord and live chat also listed
APIREST (OpenAPI 3.1), GraphQL and an MCP server, with the same actions as the appGraphQL API, webhooks, events and MCP listed under the developer platform
Feedback and roadmapFeedback board and public roadmap on GrowthNot listed on the pricing page
EnterpriseSAML SSO, SCIM, EU data residency, custom DPAFrontier: SSO/SCIM, HIPAA, multiple workspaces, dedicated CSM

Where Plain fits better

  • You need HIPAA coverage. Plain lists it on Frontier; Weft's pricing page doesn't.
  • You want a vendor with a longer track record. Weft is a newer product.
  • You already use Plain's in-app channel and internal Sidekick agent and they work for you.

If you switch

  • Connect Slack first. Weft picks up the shared channels you invite it to, and customers keep writing where they already do.
  • Add email and the other channels once the Slack queue feels right.
  • Invite engineering and sales as free read-only teammates so escalations stay in one thread.
  • Run the Customer Agent in draft mode on real threads before you let it resolve anything.

How to choose

Most teams comparing the two have already decided support should live in Slack Connect. The question is cost and fit.

Count the people who actually reply to customers each week, not everyone who might read a thread. If that number is over five, Plain’s Foundation plan stops fitting and you are on Horizon at $99, or Frontier. On Weft the same team stays on Starter or Growth at whatever size it is.

Then estimate how many conversations you would let an AI agent close on its own each month. That number matters more than the per-seat price once it gets into the hundreds. The seat cost calculator does the arithmetic for both, plus Zendesk, from the public list prices.

Questions

Is Weft cheaper than Plain?

On list price, yes. Weft Starter is $39 per seat per month billed annually; Plain Foundation is listed at $45 per user per month billed annually. Weft Growth is $89 against Plain Horizon at $99. AI is billed differently on each, so use the seat cost calculator with your own numbers.

Does Weft have seat limits like Plain's lower plans?

No. Starter and Growth have no seat caps; you move up for features, not headcount. Plain's pricing page lists Foundation at up to 5 member seats and Horizon at 3 to 10.

How does AI pricing compare?

Weft charges $0.80 for each conversation the Customer Agent resolves on its own, and nothing for drafts it hands to a person. Plain's Ari uses 100 credits per resolution, with 1,000 or 2,500 credits included a month depending on plan and extra credits at $10 per 1,000.

Can I move from Plain to Weft without customers noticing?

Customers keep writing in the same shared Slack channels. Once Weft is in the channel, new messages become threads in Weft and your replies land in Slack under your own name.

Sources

Competitor details come from each vendor's public pages, checked November 10, 2026. Prices and plans change; check the source before you buy. Spot an error? Email hello@weft.day.

Related

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