LangChain vs Not Diamond
Which Developer Tools AI tool is better in 2026?
LangChain
Build context-aware AI applications
Not Diamond
Data-driven recommendation and routing layer that sends each prompt to the best AI model
Side-by-side
LangChain leads on both fronts — more capital raised ($125M) and a lower entry price than Not Diamond.
| Metric | LangChain | Not Diamond |
|---|---|---|
| Taglinei | Build context-aware AI applications | Data-driven recommendation and routing layer that sends each prompt to the best AI model |
| Foundedi | 2022🏆 | — |
| HQi | San Francisco, US | San Francisco, United States |
| Employeesi | 50-100🏆 | — |
| Neuron scorei | 54 | 64🏆 |
| Total fundingi | $125M🏆 | $2.3M |
| Latest roundi | Series B · Oct 2025 | Pre-Seed · Jul 2024 |
| Valuationi | $1.3B🏆 | — |
| Cheapest paid plani | Plus · $39/mo🏆 | Pricing not disclosed |
| Free plani | ✓ Developer | ✓ |
| Free triali | ✗ | ✓ |
| Top tier pricei | Plus · $39/mo | Pricing not disclosed |
| Pricing summaryi | 3 published plans | Free |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for LangChain and Not Diamond.
| Capability | LangChain | Not Diamond |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | 4 (Python, TypeScript, Go, Java) | — |
| Free plan | ✓ | ✓ |
| Free trial | ✗ | ✓ |
| Verified | ✓ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of LangChain
- Has raised more capital ($125M vs $2.3M)
- Lower starting price ($39/mo)
- Newer company (2022)
- Verified profile
🔵 Strengths of Not Diamond
- Higher Neuron score (64 vs 54)
- Offers a free plan
- Offers a free trial
Which should you choose?
Choose LangChain if price matters most — it starts at Freemium · From $39/mo, which is friendlier for teams watching burn. Both AI Developer Tools tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose LangChain if you want the most established option — it has raised $125M, 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
LangChain vs Not Diamond — which is better?
It depends on your priority. LangChain has raised more capital and is the more established option; Not Diamond has broader feature depth. See the side-by-side table above.
Is LangChain cheaper than Not Diamond?
Yes — LangChain's cheapest paid plan is Plus · $39/mo, while Not Diamond's is Free.
Do LangChain and Not Diamond offer free plans?
LangChain: Yes, has a free plan. Not Diamond: Yes, has a free plan.
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