C3 AI vs Writer: who uses which
Customers, public proof and the companies that use both.
On usedby, 35 companies use C3 AI and 74 use Writer. No company is listed with both yet. Writer leads among the HealthTech & Digital Health companies on usedby that use either tool.Latest check Oct 8, 2026: 101 of 109 public lines checked. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side.
Who uses C3 AI, Writer, or both
Every company with a public proof for at least one of the two tools.
35
use only C3 AI
0
companies use both
74
use only Writer
35 companies use only C3 AI, 74 use only Writer and 0 use both, out of the 109 companies on usedby that use at least one of them.
Where it lands
Newest customers
We have not started tracking changes for C3 AI yet.
Where it lands
Newest customers
Who uses both
Companies with a confirmed or observed line on both tools.
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use C3 AI, Writer or both: a share of the companies on usedby, not of the market.
C3 AI onlyBothWriter only
More common with Writer
- HealthTech & Digital Health7 of the 7 HealthTech & Digital Health companies on usedby that use either tool use Writer.
- Marketing Tech7 of the 7 Marketing Tech companies on usedby that use either tool use Writer.
- Fintech & Payments5 of the 5 Fintech & Payments companies on usedby that use either tool use Writer.
Source: confirmed and observed usedby lines. Job-post signals, the weakest proof level, are left out of these shares.
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
C3 AIWriterWhat customers report
Results as the vendor or the customer published them, with the source and the date.
C3 AI
99% reduction in the time to generate threat data, from weeks to minutes
Missile Defense Agency
Vendor case study, c3.ai, captured Oct 8, 2026
Writer
No reviewed story for Writer yet.
Questions about C3 AI and Writer
Which is used more, C3 AI or Writer?
Writer has more customers on usedby: 74 against 35 for C3 AI.
Do companies use both C3 AI and Writer?
usedby has not found a company with a confirmed or observed line on both C3 AI and Writer yet.
Who uses C3 AI?
35 companies on usedby, each with the public page that shows it. See who uses C3 AI.
Who uses Writer?
74 companies on usedby, each with the public page that shows it. See who uses Writer.
How does usedby count customers?
A company counts when a public page shows it: a vendor's customer page, a case study, a press release or a job post, most saved with a dated capture. Every line is a customer, at one of three proof levels: confirmed, observed or signal (a job post, the weakest). A company is named as using both tools when its lines on both are confirmed or observed.