Shortwave vs Sierra: 2026 comparison
AI email client — natural-language search, summary, scheduled send, and AI-drafted replies grounded in your inbox.
Shortwave vs Sierra — specs
| Spec | Shortwave | Sierra |
|---|---|---|
| Agent Rank | 72 / 100 (A) | 78 / 100 (A) |
| Autonomy | Assistant | Autonomous |
| Pricing | Freemium · from $9 | Subscription · Free tier |
| Open source | No | No |
| Capabilities | RAG, Memory, Tool use | Voice, Tool use, Memory, RAG |
| Integrations | 3 apps | 3 apps |
| Verified | Verified | Verified |
| Released | Feb 2025 | Feb 2025 |
Agent Rank breakdown
- Autonomy fit
- 7
- Capabilities
- 6
- Integrations
- 6
- Pricing value
- 8
- Polish & maturity
- 6
- Verifiability
- 10
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
- +Best AI-native email client in 2026 — search, summarize, draft all natural-language
- +Built specifically for Gmail; faster + smarter than Gmail itself
- +Cheap relative to Superhuman with better AI features
- −Gmail-only — no Outlook support
- −AI assistant is helpful but not yet revolutionary
- −Smaller user base means fewer integrations than Gmail/Outlook ecosystems
- +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
- +Basic AI summary
- +90-day search
- +Unlimited search
- +AI assistant
- +Scheduled send
- +Shared inboxes
- +Send delegation
- +Admin controls
- +Voice + chat
- +Custom persona
- +White-glove implementation
- +SOC 2 II + HIPAA option
Which one should you pick?
Pick Shortwave if its specific capabilities (RAG, Memory) match what you need.
Try Shortwave →Pick Sierra if cost is the main constraint or if you want the highest autonomy and the verification loop is in place.
Try Sierra →Affiliate links. We may earn a commission at no extra cost to you.
Frequently asked
Should I pick Shortwave or Sierra in 2026?+
Pick Shortwave if its specific capabilities (RAG, Memory) match what you need. Pick Sierra if cost is the main constraint or if you want the highest autonomy and the verification loop is in place. Most working teams running both can use Shortwave for primary work and Sierra for the workflows where its specific strengths matter.
What's the price difference between Shortwave and Sierra?+
Shortwave starts at Freemium · from $9; Sierra starts at Subscription · Free tier. Sierra is the cheaper entry option. For team deployments the TCO can differ — use the AI Agent Rank TCO calculator for your specific volume.
Which is more autonomous, Shortwave or Sierra?+
Sierra is the more autonomous of the two (Autonomous vs Assistant). Higher autonomy ships throughput faster but requires verification loops in place — see our autonomous-vs-copilot framing for when each tier wins.