# The 3 best AI contract review tools (2026) — AgentsIndex

> Source: https://agentsindex.ai/categories/contract-review (curated, re-verified)
> Updated 28 October 2026 · Reviewed by the AgentsIndex editorial team

Review, redline and manage contracts against your own playbook.

3 tools in this category, ranked by what we can confirm about each (a public price, an API and docs, independent sources, stated limits; payment never changes the order). Each name links to its answer-first markdown twin.

## Facts

- Free to start: 0 of 3
- MCP server: 1 yes, of 3
- API: 1 yes, of 3
- Open source: 0 yes, of 3
- Self-host: 1 yes, of 3
- First paid plan a month: none of the 3 publishes one
- Checked against their own sites: 26–28 October 2026 (3 of 3)
- Added in October 2026: 1

| Name | What it is | Pricing | MCP server | API | Open source | Self-host |
| --- | --- | --- | --- | --- | --- | --- |
| [Luminance](https://agentsindex.ai/luminance.md) | Contract intelligence platform that reviews, redlines and routes enterprise contracts with legal-specific AI models. | On quote | Yes | Not listed | No | Yes |
| [Spellbook](https://agentsindex.ai/spellbook.md) | AI contract review, drafting and a multi-document agent that run inside Microsoft Word and Google Docs. | On quote | Not listed | Not listed | No | No |
| [LegalOn](https://agentsindex.ai/legalon.md) | Legal AI that reviews and redlines contracts inside Word against 135+ attorney-built playbooks. | On quote | Not listed | Yes | No | Not listed |

## October in AI contract review tools

- Prices checked: 3 of 3 tools, on their own pricing pages
- Added in October: 1 new tool
- Last checked: 28 Oct, oldest check 26 Oct

## AI contract review tools compared

| Tool | Price on its site | MCP server | API | Open source | Self-host |
| --- | --- | --- | --- | --- | --- |
| [Luminance](https://agentsindex.ai/luminance) | On quote | Yes | Not stated | No | Yes |
| [Spellbook](https://agentsindex.ai/spellbook) | On quote | Not stated | Not stated | No | No |
| [LegalOn](https://agentsindex.ai/legalon) | On quote | Not stated | Yes | No | Not stated |

All 3 AI contract review tools we list.

None of the 3 tools here has a free plan, against 48% across the index. None is open source, against 24% across the index.

## About AI contract review

### How are AI contract review tools priced?

None of the 3 publishes a monthly price. None of the 3 has a free plan.

### Are there any open-source AI contract review tools?

None of the 3 listed here is open source.

### Which AI contract review tools have an MCP server?

1 of the 3 has an MCP server: Luminance.

## Sources and method

Tools rank higher the more we can confirm: a public price, an API and docs, sources, stated limits. [How we rank](https://agentsindex.ai/methodology/)

Prices are taken from each vendor's pricing page.

- [LegalOn](https://agentsindex.ai/legalon): [legalontech.com/pricing](https://www.legalontech.com/pricing), checked 28 October 2026
- [Luminance](https://agentsindex.ai/luminance): [luminance.com/legal/master-agreement](https://www.luminance.com/legal/master-agreement), checked 26 October 2026
- [Spellbook](https://agentsindex.ai/spellbook): [spellbook.com/pricing](https://spellbook.com/pricing), checked 26 October 2026

## Where next

### Related categories

- [Legal AI agents](https://agentsindex.ai/categories/legal-ai-agents)