Abacus.AI vs Writer: who uses which
Customers, public proof and the companies that use both.
On usedby, 17 companies use Abacus.AI and 74 use Writer. 2 companies use both, including Mars and American Eagle. Writer leads among the HealthTech & Digital Health companies on usedby that use either tool.Latest check Oct 8, 2026: 83 of 91 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 Abacus.AI, Writer, or both
Every company with a public proof for at least one of the two tools.
15
use only Abacus.AI
2
companies use both
72
use only Writer
15 companies use only Abacus.AI, 72 use only Writer and 2 use both, out of the 89 companies on usedby that use at least one of them.
Where it lands
Newest customers
No new customer since tracking started on October 7, 2026.
Where it lands
Newest customers
Who uses both
Companies with a confirmed or observed line on both tools.
| Company | First public proof, Writer |
|---|---|
 Mars | On or before Jan 2025 |
 American Eagle | On or before Dec 2024 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Abacus.AI, Writer or both: a share of the companies on usedby, not of the market.
Abacus.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 6 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.
Abacus.AIWriterWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Questions about Abacus.AI and Writer
Which is used more, Abacus.AI or Writer?
Writer has more customers on usedby: 74 against 17 for Abacus.AI.
Do companies use both Abacus.AI and Writer?
Yes. 2 companies use both on usedby, including Mars and American Eagle.
Who uses Abacus.AI?
17 companies on usedby, each with the public page that shows it. See who uses Abacus.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.