Sierra vs Thoughtly
On the evidence we track, Thoughtly leads this comparison with a composite score of 65/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.
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
Sierra enables businesses to create and deploy conversational AI agents across voice, chat, email, SMS, and other channels. The platform uses an outcome-based pricing model where customers pay based on business results delivered rather than traditional fixed fees.
Thoughtly
LeaderA SaaS platform using AI agents to automatically follow up with existing leads through voice, SMS, and email — particularly after missed calls or as part of multi-touch campaigns — with built-in compliance for telecommunications regulations.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Thoughtly
LeaderFrom $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
Leader- 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
- +1 more
Sierra or Thoughtly: which one depends on you
A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.
Free to run, no account needed to start. How the evaluation works
Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.