micro1 vs Prefactor
Which Evaluation AI tool is better in 2026?
micro1
Human intelligence infrastructure for high-quality AI training data
Prefactor
Agent observability and evaluation that scores every production run in real time
Side-by-side
micro1 is the more established option (raised $35M); pricing is comparable on both sides.
| Metric | micro1 | Prefactor |
|---|---|---|
| Taglinei | Human intelligence infrastructure for high-quality AI training data | Agent observability and evaluation that scores every production run in real time |
| Foundedi | 2023🏆 | 2024 |
| HQi | Palo Alto, US | San Francisco, United States |
| Employeesi | 51-200 | 2-10🏆 |
| Neuron scorei | 59🏆 | 31 |
| Total fundingi | $35M🏆 | Undisclosed |
| Latest roundi | Series A · Feb 2026 | — |
| Valuationi | $500M🏆 | — |
| Cheapest paid plani | Pricing not disclosed | Pricing not disclosed |
| Free plani | ✗ | ✓ |
| Free triali | ✗ | ✓ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Enterprise · Contact sales | Free |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for micro1 and Prefactor.
| Capability | micro1 | Prefactor |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✓ |
| Free trial | ✗ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of micro1
- Has raised more capital ($35M vs Undisclosed)
- Higher Neuron score (59 vs 31)
- More mature (2023)
🔵 Strengths of Prefactor
- Offers a free plan
- Offers a free trial
- Newer company (2024)
Which should you choose?
Choose Prefactor if price matters most — it starts at Free, which is friendlier for teams watching burn. Both AI Evaluation tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose micro1 if you want the most established option — it has raised $35M, 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
micro1 vs Prefactor — which is better?
It depends on your priority. micro1 has raised more capital and is the more established option; Prefactor has broader feature depth. See the side-by-side table above.
Is micro1 cheaper than Prefactor?
No — Prefactor's cheapest paid plan is Free, while micro1's is Enterprise · Contact sales.
Do micro1 and Prefactor offer free plans?
micro1: Paid only. Prefactor: Yes, has a free plan.
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