Adept vs Sierra: 2026 comparison
Browser-driving AI agent — completes multi-step workflows on real web apps the way a human would.
Adept vs Sierra — specs
| Spec | Adept | Sierra |
|---|---|---|
| Agent Rank | 67 / 100 (B) | 78 / 100 (A) |
| Autonomy | Autonomous | Autonomous |
| Pricing | Subscription · Free tier | Subscription · Free tier |
| Open source | No | No |
| Capabilities | Browser, Tool use, Memory, Vision | Voice, Tool use, Memory, RAG |
| Integrations | 3 apps | 3 apps |
| Verified | — | Verified |
| Released | Apr 2025 | Feb 2025 |
Agent Rank breakdown
- Autonomy fit
- 9
- Capabilities
- 8
- Integrations
- 4
- Pricing value
- 9
- Polish & maturity
- 4
- Verifiability
- 6
Auto-computed from autonomy, capabilities, integrations, pricing, maturity and editorial verification. Updated every deploy. How is this computed?
- Autonomy fit
- 9
- Capabilities
- 8
- Integrations
- 6
- Pricing value
- 9
- Polish & maturity
- 5
- Verifiability
- 10
Auto-computed from autonomy, capabilities, integrations, pricing, maturity and editorial verification. Updated every deploy. How is this computed?
Pros & cons
- +Pioneering work on UI-driven browser agents — strong research lineage
- +Best for fully-autonomous, multi-step workflows that cross web apps
- +Foundation models tuned specifically for browser action prediction
- −Not generally available — enterprise pilots only as of mid-2026
- −Pricing not public
- −Reliability on long-tail UIs still a work in progress
- +Best-in-class for branded customer-facing agents (voice + chat parity)
- +Concierge onboarding from one of the strongest teams in AI
- +Indistinguishable-from-human quality in tier-1 deployments
- −Enterprise-only pricing — typical contracts $150–500k/year
- −Deployment is white-glove, not SaaS — multi-week setup
- −Overkill for SMB or mid-market support volumes
Pricing
- +Browser-driving agent
- +Custom workflow training
- +Dedicated research-eng support
- +Voice + chat
- +Custom persona
- +White-glove implementation
- +SOC 2 II + HIPAA option
Which one should you pick?
Pick Sierra if you want a vendor we've verified for accessibility and pricing accuracy.
Try Sierra →Affiliate links. We may earn a commission at no extra cost to you.
Frequently asked
Should I pick Adept or Sierra in 2026?+
Pick Adept if its specific capabilities (Browser, Tool use) match what you need. Pick Sierra if you want a vendor we've verified for accessibility and pricing accuracy. Most working teams running both can use Adept for primary work and Sierra for the workflows where its specific strengths matter.
What's the price difference between Adept and Sierra?+
Both Adept and Sierra start in the same pricing range (Subscription · Free tier vs Subscription · Free tier). Total cost of ownership depends on your team size and volume — see the TCO calculator for your specific math.
Which is more autonomous, Adept or Sierra?+
Both Adept and Sierra are Autonomous agents — neither has a meaningful autonomy advantage over the other. The decision should hinge on capabilities and pricing instead.