# Abacus.AI vs C3 AI: who uses which

On usedby, 17 companies use Abacus.AI and 35 use C3 AI. No company is listed with both yet. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side. Latest check 2026-10-08: 52 of 52 public lines checked.

## Side by side

|  | [Abacus.AI](https://www.usedby.ai/tools/abacus-ai.md) | [C3 AI](https://www.usedby.ai/tools/c3-ai.md) |
|---|---|---|
| Public customers | 17 | 35 |
| Confirmed | 0 | 23 |
| Observed | 17 | 12 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers | DevTools & Infrastructure (3), Consumer Goods (1), Data & Analytics (1) | Aerospace & Defense (2), Energy, Utilities & Cleantech (2), Biotech & Pharma (1) |
| Category | Enterprise AI Platforms | Enterprise AI Platforms |
| Your data | Not used to train models by default. ([abacus.ai](https://abacus.ai/security), checked 2026-10-08) | — |

## Published results

Reviewed stories only; usedby did not measure the figures.

- C3 AI: [Missile Defense Agency](https://www.usedby.ai/case-studies/missile-defense-agency-c3-ai.md): **99%**: “99% reduction in the time to generate threat data, from weeks to minutes” (captured by usedby 2026-10-08)

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Source: https://www.usedby.ai/compare/abacus-ai-vs-c3-ai · How we check: https://www.usedby.ai/methodology