OpenEvidence vs Vespa.ai
Which Search AI tool is better in 2026?
OpenEvidence
AI medical assistant for clinicians
Vespa.ai
Big-data serving engine for vector and lexical search
Side-by-side
OpenEvidence is the more established option (raised $735M), but Vespa.ai is cheaper to start.
| Metric | OpenEvidence | Vespa.ai |
|---|---|---|
| Taglinei | AI medical assistant for clinicians | Big-data serving engine for vector and lexical search |
| Foundedi | 2022🏆 | 2023 |
| HQi | San Francisco, US | Trondheim, NO |
| Employeesi | 50-200 | 51-100🏆 |
| Neuron scorei | 64 | 82🏆 |
| Total fundingi | $735M🏆 | $31M |
| Latest roundi | Series D · Jan 2026 | Series A · Nov 2023 |
| Valuationi | $12B🏆 | — |
| Cheapest paid plani | — | Pricing not disclosed🏆 |
| Free plani | ✓ Free for Verified US Physicians | ✓ |
| Free triali | ✗ | ✓ |
| Top tier pricei | — | Pricing not disclosed |
| Pricing summaryi | 1 published plans | Free |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for OpenEvidence and Vespa.ai.
| Capability | OpenEvidence | Vespa.ai |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✓ |
| Webhooks | ✗ | ✓ |
| OAuth 2.0 | ✗ | ✓ |
| SDK languages | 2 (TypeScript, Python) | 3 (python, java, rest) |
| Free plan | ✓ | ✓ |
| Free trial | ✗ | ✓ |
| Verified | ✓ | ✗ |
| Active deal | ✗ | ✓ |
🟢 Strengths of OpenEvidence
- Has raised more capital ($735M vs $31M)
- More mature (2022)
- Verified profile
🔵 Strengths of Vespa.ai
- Higher Neuron score (82 vs 64)
- Offers a free trial
- Newer company (2023)
Which should you choose?
Choose Vespa.ai if price matters most — it starts at Free, which is friendlier for teams watching burn. Both AI Search tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose OpenEvidence if you want the most established option — it has raised $735M, 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.
💸 Deals
Vespa Cloud — $300 in free trial credits
New Vespa Cloud accounts get $300 in trial credits to spin up production-grade vector + lexical search.
Terms: New accounts only. Expires after 30 days.
Frequently asked questions
OpenEvidence vs Vespa.ai — which is better?
It depends on your priority. OpenEvidence has raised more capital and is the more established option; Vespa.ai is cheaper to start. See the side-by-side table above.
Is OpenEvidence cheaper than Vespa.ai?
No — Vespa.ai's cheapest paid plan is Free, while OpenEvidence's is Free.
Do OpenEvidence and Vespa.ai offer free plans?
OpenEvidence: Yes, has a free plan. Vespa.ai: Yes, has a free plan.
Explore more AI Search tools
Contextual paths to related AI startups, deals and rankings.