# AI assistants: the tools companies use

121 companies on usedby use at least one of the 4 tools in this category with a public customer. Claude leads with 88 companies. Counts are of companies on usedby, not of the whole market. Latest check 2026-10-14: 77 of 138 public lines checked.

> General-purpose AI assistants that people chat with to write, analyze, code and research at work.

Family: [AI assistants & models](https://www.usedby.ai/tools/category/ai-assistants-models.md)

## Ranking

Public customers count every public line, job-post signals included; ties share a rank.

| Rank | Tool | Public customers | Confirmed | Observed | Signals |
|---|---|---|---|---|---|
| 1 | [Claude](https://www.usedby.ai/tools/claude.md) | 88 | 5 | 46 | 37 |
| 2 | [ChatGPT](https://www.usedby.ai/tools/chatgpt.md) | 44 | 0 | 35 | 9 |
| 3 | [Microsoft Copilot](https://www.usedby.ai/tools/microsoft-copilot.md) | 4 | 0 | 0 | 4 |
| 4 | [Gemini](https://www.usedby.ai/tools/gemini.md) | 2 | 0 | 0 | 2 |

Tools in this category without a public customer yet: [Genspark](https://www.usedby.ai/tools/genspark.md).

---
Source: https://www.usedby.ai/tools/category/ai-assistants · How we check: https://www.usedby.ai/methodology