Not Diamond vs Weights & Biases
Which Developer Tools AI tool is better in 2026?
Not Diamond
Data-driven recommendation and routing layer that sends each prompt to the best AI model
Weights & Biases
The AI developer platform
Side-by-side
Weights & Biases is the more established option (raised $245M); pricing is comparable on both sides.
| Metric | Not Diamond | Weights & Biases |
|---|---|---|
| Taglinei | Data-driven recommendation and routing layer that sends each prompt to the best AI model | The AI developer platform |
| Foundedi | — | 2018🏆 |
| HQi | San Francisco, United States | San Francisco, US |
| Employeesi | — | 500-1000🏆 |
| Neuron scorei | 64🏆 | 49 |
| Total fundingi | $2.3M | $245M🏆 |
| Latest roundi | Pre-Seed · Jul 2024 | Series C · Oct 2023 |
| Valuationi | — | $1B🏆 |
| Cheapest paid plani | Pricing not disclosed | — |
| Free plani | ✓ | ✗ |
| Free triali | ✓ | ✗ |
| Top tier pricei | Pricing not disclosed | Enterprise · Contact sales |
| Pricing summaryi | Free | 1 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Not Diamond and Weights & Biases.
| Capability | Not Diamond | Weights & Biases |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | 1 (Python) |
| Free plan | ✓ | ✗ |
| Free trial | ✓ | ✗ |
| Verified | ✗ | ✓ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Not Diamond
- Higher Neuron score (64 vs 49)
- Offers a free plan
- Offers a free trial
🔵 Strengths of Weights & Biases
- Has raised more capital ($245M vs $2.3M)
- Newer company (2018)
- Verified profile
Which should you choose?
Choose Weights & Biases if price matters most — it starts at Enterprise · Contact sales, 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 Weights & Biases if you want the most established option — it has raised $245M, 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
Not Diamond vs Weights & Biases — which is better?
It depends on your priority. Not Diamond is the leaner option; Weights & Biases has broader feature depth. See the side-by-side table above.
Is Not Diamond cheaper than Weights & Biases?
No — Weights & Biases's cheapest paid plan is Enterprise · Contact sales, while Not Diamond's is Free.
Do Not Diamond and Weights & Biases offer free plans?
Not Diamond: Yes, has a free plan. Weights & Biases: Paid only.
Explore more AI Developer Tools tools
Contextual paths to related AI startups, deals and rankings.