> ## Documentation Index
> Fetch the complete documentation index at: https://docs.postsig.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

> Overview of all contract types in PostSig

PostSig recognizes nine contract types. Each one renders a tailored set of fields in the app. Two types — **Invoice** and **NDA** — have their own custom field set; the other seven share a single default set.

## All contract types

| Contract Type                   | Field set  | Per-type docs                                |
| ------------------------------- | ---------- | -------------------------------------------- |
| Master Services Agreement (MSA) | Default    | [MSA →](/contract-types/msa)                 |
| Service Order (SO)              | Default    | [SO →](/contract-types/so)                   |
| Addendum                        | Default    | [Addendum →](/contract-types/addendum)       |
| Other                           | Default    | [Other →](/contract-types/other)             |
| Terms of Service (TOS)          | Default    | [TOS →](/contract-types/tos)                 |
| Invoice                         | **Custom** | [Invoice →](/contract-types/invoice)         |
| Trial Agreement                 | Default    | [Trial →](/contract-types/trial)             |
| NDA                             | **Custom** | [NDA →](/contract-types/nda)                 |
| Operational Agreement           | Default    | [Operational →](/contract-types/operational) |

For full definitions of every field, see the [Contract Fields glossary](/fields).