Sierra vs Thoughtly
No clear leader: Thoughtly (64.4) and Sierra (62.3) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.
Capabilities
Feature-by-feature on the axes that matter for voice ai agents. “-” means undocumented, not absent.
What each one is
The product in its own terms, so the numbers below have context.
Sierra
A platform for building and deploying AI agents across chat, voice, email, SMS, WhatsApp, and ChatGPT. Includes a no-code agent builder, conversation analytics, and automated agent optimization capabilities with enterprise-grade security and compliance.
Thoughtly
A SaaS platform that uses AI voice agents to call and engage leads, automatically follow up via SMS and email, and integrate with existing CRM and business tools. The system handles initial outreach, qualification, and routing while syncing results back to the customer's systems.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Sierra
Outcome-based pricing model where payment is tied to business outcomes delivered
Thoughtly
From $500/month. Usage-based billing above plan limits. No per-channel or per-seat fees.
- Flex$500/month. Unlimited channels and minutes.
- Voice, SMS, email, workflows
- Unlimited usage across channels
- 200+ integrations + REST API
- Two-way CRM sync (HubSpot, Salesforce, Zoho)
- 34+ languages, voice cloning
- +1 more
- ScaleContact sales
- Everything in Flex
- 100+ concurrent calls
- Auto-QA + evals on every conversation
- SOC 2 Type II reports + TCPA review
- Dedicated CSM, Slack support, extended hours
- +1 more
- EnterpriseContact sales
- Everything in Scale
- Custom LLM (bring your own model)
- HIPAA + BAA, PCI scope review
- Dedicated infrastructure + data residency
- SSO, SCIM, advanced RBAC
- +2 more
Platform & deployment
Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.
Integrations
What each product connects to. Counts come from the vendor's own integration directory where one exists.
Sierra
- ChatGPT
- Chat
- Voice
- SMS
Thoughtly
- Salesforce
- HubSpot
- Zoho CRM
- Pipedrive
- Keap
- GoHighLevel
- Attio
- Calendly
- Zoom
- Google Sheets
- Airtable
- Slack
- Gmail
- Zapier
- Make
- Zendesk
- Shopify
- Acuity Scheduling
- Cal.com
- Mindbody
- Zoho Bookings
- Typeform
- Trello
- Smartsheet
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.