# Abacus.AI vs Writer: who uses which

On usedby, 17 companies use Abacus.AI and 74 use Writer. 2 companies use both, including Mars and American Eagle. 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: 83 of 91 public lines checked.

## Side by side

|  | [Abacus.AI](https://www.usedby.ai/tools/abacus-ai.md) | [Writer](https://www.usedby.ai/tools/writer.md) |
|---|---|---|
| Public customers | 17 | 74 |
| Confirmed | 0 | 63 |
| Observed | 17 | 11 |
| Signals (job posts) | 0 | 0 |
| Top industries of customers | DevTools & Infrastructure (3), Consumer Goods (1), Data & Analytics (1) | HealthTech & Digital Health (7), Marketing Tech (7), Fintech & Payments (5) |
| 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) | Not used to train models by default. ([writer.com](https://writer.com/trust/), checked 2026-10-03) |
| Security | — | SOC 2 Type II, ISO 27001 ([writer.com](https://writer.com/trust/), checked 2026-10-03) |
| Data processing terms | — | A data processing agreement is available. ([writer.com](https://writer.com/legal/data-processing/), checked 2026-10-03) |
| Free trial | — | Free trial or free plan available. ([writer.com](https://writer.com/plans/), checked 2026-10-03) |
| Integrations | — | Snowflake, Salesforce, Contentful, Adobe Experience Manager, Asana, Atlassian, Databricks, FactSet, Gong, Google BigQuery, Google Workspace, HubSpot ([writer.com](https://writer.com/product/connectors/), checked 2026-10-03) |

## Companies named on both

Confirmed or observed on each side. The first public proof is not an adoption date.

| Company | First public proof, Writer |
|---|---|
| [Mars](https://www.usedby.ai/companies/mars.md) | On or before January 2025 |
| [American Eagle](https://www.usedby.ai/companies/american-eagle.md) | On or before December 2024 |

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