LangWatch vs Scale AI
Which Evaluation AI tool is better in 2026?
LangWatch
Platform for LLM evaluations, agent testing and observability
Scale AI
Data labeling and AI infrastructure platform powering frontier models for enterprises and governments.
Side-by-side
Scale AI is the more established option (raised $14.3B); pricing is comparable on both sides.
| Metric | LangWatch | Scale AI |
|---|---|---|
| Taglinei | Platform for LLM evaluations, agent testing and observability | Data labeling and AI infrastructure platform powering frontier models for enterprises and governments. |
| Foundedi | 2023 | 2016🏆 |
| HQi | Amsterdam, NL | San Francisco, US |
| Employeesi | 1-10 | 1000+🏆 |
| Neuron scorei | 60 | 85🏆 |
| Total fundingi | $1.1M | $14.3B🏆 |
| Latest roundi | Pre-Seed · Jan 2024 | Strategic Investment · Jun 2025 |
| Valuationi | — | $29B🏆 |
| Cheapest paid plani | Pricing not disclosed | — |
| Free plani | ✓ | ✗ |
| Free triali | ✗ | ✗ |
| Top tier pricei | Pricing not disclosed | Enterprise / Custom · Contact sales |
| Pricing summaryi | Open source | 1 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for LangWatch and Scale AI.
| Capability | LangWatch | Scale AI |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✓ |
| Webhooks | ✗ | ✓ |
| OAuth 2.0 | ✗ | ✓ |
| SDK languages | — | 1 (Python) |
| Free plan | ✓ | ✗ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✓ |
| Active deal | ✗ | ✗ |
🟢 Strengths of LangWatch
- Offers a free plan
- Newer company (2023)
🔵 Strengths of Scale AI
- Has raised more capital ($14.3B vs $1.1M)
- Higher Neuron score (85 vs 60)
- More mature (2016)
- Verified profile
Which should you choose?
Choose Scale AI if price matters most — it starts at Enterprise · Contact sales, 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 Scale AI if you want the most established option — it has raised $14.3B, 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
LangWatch vs Scale AI — which is better?
It depends on your priority. LangWatch is the leaner option; Scale AI has broader feature depth. See the side-by-side table above.
Is LangWatch cheaper than Scale AI?
No — Scale AI's cheapest paid plan is Enterprise · Contact sales, while LangWatch's is Open source.
Do LangWatch and Scale AI offer free plans?
LangWatch: Yes, has a free plan. Scale AI: Paid only.
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