Celestial AI vs Chalk
Which Infrastructure AI tool is better in 2026?
Celestial AI
Photonic Fabric optical interconnect for AI infrastructure
Chalk
AI data platform delivering real-time context for models and agents
Side-by-side
Celestial AI is the more established option (raised $515M); pricing is comparable on both sides.
| Metric | Celestial AI | Chalk |
|---|---|---|
| Taglinei | Photonic Fabric optical interconnect for AI infrastructure | AI data platform delivering real-time context for models and agents |
| Foundedi | 2020🏆 | 2022 |
| HQi | Santa Clara, United States | San Francisco, US |
| Employeesi | — | 11-50🏆 |
| Neuron scorei | 77🏆 | 55 |
| Total fundingi | $515M🏆 | $60M |
| Latest roundi | Series C1 · Mar 2025 | Series A · May 2025 |
| 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 | Custom | Enterprise · Contact sales |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Celestial AI and Chalk.
| Capability | Celestial AI | Chalk |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✗ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Celestial AI
- Has raised more capital ($515M vs $60M)
- Higher Neuron score (77 vs 55)
- More mature (2020)
🔵 Strengths of Chalk
- Newer company (2022)
Which should you choose?
Choose Chalk if price matters most — it starts at Enterprise · Contact sales, which is friendlier for teams watching burn. Both AI Infrastructure tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Celestial AI if you want the most established option — it has raised $515M, 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
Celestial AI vs Chalk — which is better?
It depends on your priority. Celestial AI has raised more capital and is the more established option; Chalk has broader feature depth. See the side-by-side table above.
Is Celestial AI cheaper than Chalk?
No — Chalk's cheapest paid plan is Enterprise · Contact sales, while Celestial AI's is Custom.
Do Celestial AI and Chalk offer free plans?
Celestial AI: Paid only. Chalk: Paid only.
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