Forethought vs Sierra

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Public API: Both have one
Best fit: Forethought: Mid-size and enterprise support teams with high ticket volume on an existing helpdesk · Sierra: Consumer brands and financial-services companies with high-volume support across chat and voice
Platforms: Forethought: Web, Slack app · Sierra: Web
Trust score: About even — Forethought 92, Sierra 90
Status: Both up at our last check (Sep 6, 2026)

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

ForethoughtSupport AI agents for chat, email and voice, with ticket triage and agent assist, now sold by Zendesk

SierraBranded chat and voice agents for customer service, sold on resolved outcomes rather than seats

Side by side

Fact	Forethought	Sierra
Category	AI Support Chatbots	AI Support Chatbots
Pricing model	Contact	Contact
Public API	Yes	Yes
Trust score	92 / 100	90 / 100
Platforms	Web, API, Slack app	Web, API
Company	Forethought Technologies, Inc.	Sierra Technologies, Inc.
Launched	2018	—
Last verified	Sep 6, 2026	Sep 6, 2026

What our research says

Forethought

A mature support-automation stack — autonomous agents, triage, agent assist, QA and knowledge-gap detection — built to sit on top of whatever helpdesk you already run. Since Zendesk bought it in March 2026 the open question is how long it stays helpdesk-neutral, so non-Zendesk shops should get roadmap commitments in writing before signing a multi-year quote.

Pros

Covers the whole loop: autonomous resolution, triage, agent assist, QA scoring and gap detection
Integrates with more than twenty helpdesks and CRMs rather than forcing a migration
Voice, email, chat, Slack and a headless channel for custom surfaces
Named enterprise customers (Upwork, Grammarly, Cotopaxi) with published outcome figures
Backed by Zendesk's balance sheet after the acquisition

Cons

No public pricing; quotes mix platform fees with outcome-based charges and overages
Now owned by Zendesk, so neutrality toward Salesforce, Intercom or Freshworks customers is a question
No free trial, only a sales-led proof of value
Analytics API and Discover are paid add-ons on the Enterprise tier

Sierra

Sierra is the enterprise end of the support-agent market: the pitch is not a chatbot but an agent that can actually change an order or a policy inside your systems, priced on what it resolves. The customer list and the certification wall are real signals that large regulated companies have put it in front of their users. It is a procurement, not a purchase - no public price, no trial, and an integration project before anything goes live - so a company without a sizeable support operation has nothing to buy here.

Pros

Agents take actions in order, billing and account systems, not just answer questions
One agent runs across chat, SMS, WhatsApp, email, voice and ChatGPT
Outcome-based pricing aligns the bill with resolutions
Ghostwriter drafts agents from existing SOPs and transcripts, and the founders' track record is unusually strong

Cons

No public pricing, trial or self-serve path
Outcome pricing needs a contract definition of 'resolved' that favours neither side - read it closely
Integration with core systems is a project with real lead time
Vendor lock-in is high once customer memory and policies live in its context engine

Which one fits

Choose Forethought if you need

Mid-size and enterprise support teams with high ticket volume on an existing helpdesk
Zendesk customers who want the agents Zendesk is now integrating natively
Teams that need triage and routing as well as a front-line bot

Choose Sierra if you need

Consumer brands and financial-services companies with high-volume support across chat and voice
Support leaders who want to pay per resolved case instead of per agent seat
Regulated industries that need HIPAA, PCI and ISO 42001 attestations from the vendor