Duckbill vs Mainframe
Which Agents AI tool is better in 2026?
Duckbill
An AI-plus-human executive assistant that actually completes your personal to-do list
Mainframe
Building interfaces for the future where operating systems are built around actions, not apps, powered by AI.
Side-by-side
Duckbill is the more established option (raised $33M), but Mainframe is cheaper to start.
| Metric | Duckbill | Mainframe |
|---|---|---|
| Taglinei | An AI-plus-human executive assistant that actually completes your personal to-do list | Building interfaces for the future where operating systems are built around actions, not apps, powered by AI. |
| Foundedi | 2022🏆 | 2026 |
| HQi | Boston, United States | — |
| Employeesi | — | 1-10🏆 |
| Neuron scorei | 71🏆 | 59 |
| Total fundingi | $33M🏆 | Undisclosed |
| Latest roundi | Series A · Sep 2023 | — |
| Valuationi | — | — |
| Cheapest paid plani | Pricing not disclosed | Pro · $20/mo🏆 |
| Free plani | ✗ | ✓ Starter |
| Free triali | ✓ | ✓ |
| Top tier pricei | Pricing not disclosed | Pro · $20/mo |
| Pricing summaryi | Free trial | 2 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Duckbill and Mainframe.
| Capability | Duckbill | Mainframe |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✓ |
| Free trial | ✓ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Duckbill
- Has raised more capital ($33M vs Undisclosed)
- Higher Neuron score (71 vs 59)
- More mature (2022)
🔵 Strengths of Mainframe
- Offers a free plan
- Newer company (2026)
Which should you choose?
Choose Mainframe if price matters most — it starts at Enterprise · Contact sales, which is friendlier for teams watching burn. Both AI Agents tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Duckbill if you want the most established option — it has raised $33M, 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
Duckbill vs Mainframe — which is better?
It depends on your priority. Duckbill has raised more capital and is the more established option; Mainframe is cheaper to start. See the side-by-side table above.
Is Duckbill cheaper than Mainframe?
No — Mainframe's cheapest paid plan is Pro · $20/mo, while Duckbill's is Free trial.
Do Duckbill and Mainframe offer free plans?
Duckbill: Free trial only. Mainframe: Yes, has a free plan.
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