Brainfish vs Sierra
Which Customer Support AI tool is better in 2026?
Brainfish
Ambient AI agents that guide users inside software for proactive support
Sierra
Conversational AI agents for every business
Side-by-side
Sierra is the more established option (raised $2.2B); pricing is comparable on both sides.
| Metric | Brainfish | Sierra |
|---|---|---|
| Taglinei | Ambient AI agents that guide users inside software for proactive support | Conversational AI agents for every business |
| Foundedi | 2022🏆 | 2023 |
| HQi | Sydney, AU | San Francisco, US |
| Employeesi | 11-50 | 100-200🏆 |
| Neuron scorei | 54 | 65🏆 |
| Total fundingi | $10.3M | $2.2B🏆 |
| Latest roundi | Seed | Series D · May 2026 |
| Valuationi | — | $15.8B🏆 |
| Cheapest paid plani | Pricing not disclosed | — |
| Free plani | ✓ | ✗ |
| Free triali | ✓ | ✗ |
| Top tier pricei | Pricing not disclosed | Enterprise · Contact sales |
| Pricing summaryi | Free | 1 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Brainfish and Sierra.
| Capability | Brainfish | Sierra |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✓ | ✗ |
| Free trial | ✓ | ✗ |
| Verified | ✗ | ✓ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Brainfish
- Offers a free plan
- Offers a free trial
- More mature (2022)
🔵 Strengths of Sierra
- Has raised more capital ($2.2B vs $10.3M)
- Higher Neuron score (65 vs 54)
- Newer company (2023)
- Verified profile
Which should you choose?
Choose Sierra if price matters most — it starts at Enterprise · Contact sales, which is friendlier for teams watching burn. Both AI Customer Support tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Sierra if you want the most established option — it has raised $2.2B, suggesting more runway for enterprise features, support, and long-term roadmap. For mission-critical workflows or larger teams, that stability often outweighs a lower monthly price.
Frequently asked questions
Brainfish vs Sierra — which is better?
It depends on your priority. Brainfish is the leaner option; Sierra has broader feature depth. See the side-by-side table above.
Is Brainfish cheaper than Sierra?
No — Sierra's cheapest paid plan is Enterprise · Contact sales, while Brainfish's is Free.
Do Brainfish and Sierra offer free plans?
Brainfish: Yes, has a free plan. Sierra: Paid only.
Explore more AI Customer Support tools
Contextual paths to related AI startups, deals and rankings.