Postware – Free hosted open data models, MCP and skills to replace SaaS

Postware is offering a free hosted system of record for agents: 27 open data models, 6 packs, and 1 cloud host, according to postware.ai's report. The models cover the records a company already keeps, from customers and deals to invoices and support tickets, and each one is written so an agent can read it and use it. Hosting is described as cheap enough to leave a SaaS stack, sign-up is free with no card, and the page shows a "Copy agent prompt to start" control beside the sample identities urn:postware:core:person, urn:postware:billing:invoice, and urn:postware:crm:deal.

This piece is for operators who want those records behind the assistants and scheduled agents they already run, and for anyone weighing the free workspace against Pro at $5 a month. It goes through the ready-made models and the Person fields, the packs and the Billing fields, the single sign-in into assistants and workflow tools, the MCP calls and the skill an agent keeps, and the Free and Pro caps on workspaces, storage, egress, and backups.

Postware calls the product "The system of record for agents," and it repeats "Free tier included. No card needed."

01Twenty-seven versioned company data models

Postware publishes 27 ready-made data models for the records a company keeps, and the names listed are People, Organizations, Deals, Invoices, Subscriptions, Tickets, Tasks, and Documents. Each model is versioned and written so an agent can read the fields and use them correctly, and any model can be extended with custom attributes. Opening a model shows its fields, its identity rules, and its status categories.

The Person model is the field list printed in full: name is typed Name, emails is ContactPoint[], job_title is string, and timezone is string. That schema sits next to the sample identity urn:postware:core:person. The line beside the model count calls them "27 models for customers, deals, invoices and more," and the free start beside it is one workspace with unlimited records.

02Six packs for common software categories

The 27 models are grouped into 6 packs, arranged by the part of the business each pack runs. A pack includes pre-made extensions that add the fields that pack needs onto the other records in the workspace. Every workspace includes all of the packs, and Postware says each pack replaces a category of SaaS.

The pack names shown are CRM, Billing, Support, and Content, and Billing is the one opened into fields. An Invoice has number, status, total, and due_at; a Subscription has items, status, and current_period; a Payment has amount, method, and paid_at. The invoice sample identity is urn:postware:billing:invoice, and the deal sample identity is urn:postware:crm:deal.

Postware sets the packs against legacy SaaS, which the page says was built for people clicking screens. Agents, in that same pitch, need fast, frictionless business data, hosted for a fraction of the cost. The categories named under that pitch are CRM, Accounting, Payroll, HR, Support, Marketing, Email, Analytics, CMS, Project management, and Scheduling.

03One sign-in across assistant tools

Postware is added as a connector with one sign-in and no keys to manage, and the assistant then works in plain language by looking up customers, updating deals, and logging its work. The assistants named for that path are Claude, Grokbot, Meta Muse, ChatGPT, ChatGPT Dots, Cursor, Claude Code, Codex, VS Code, Windsurf, and Gemini CLI. A shorter "Works with" row on the same page lists Grokbot, Meta Muse, Claude, ChatGPT Dots, n8n, LangChain, and the Vercel AI SDK.

Scheduled and triggered agents are the second path, and they use the same records as the assistants. The tools named there are Grokbot Routines, Muse Routines, ChatGPT Dots Routines, n8n, the Claude Agent SDK, the OpenAI Agents SDK, the Vercel AI SDK, and LangChain. Postware also says that anything else that speaks MCP works on this connection.

04Workspace MCP server and agent skills

Every workspace is an MCP server that agents connect to. Through that one connection, an assistant reads the schema and can find, create, and update records, after a single sign-in with no keys to manage. The four operations printed under the server are post_schema_describe, post_record_query, post_record_upsert, and post_record_batch.

A skill is a short guide the agent keeps, and it says where each kind of data goes, how to avoid duplicates, and when to test a change first. The skill is added once, so every later session starts already knowing the data. That is the behavior the page describes as "Your agent installs a skill that teaches it your data," and both the skill and the MCP server are included in every workspace.

05Free start and five-dollar Pro

Hosting is free to start at $0 with no card, and it costs $5 when the account grows. Free allows 1 workspace, 500 MB of storage, 5 GB of egress a month, and backups kept for 7 days, and that same offer is also described as one workspace with unlimited records. Pro is $5 per month, or $50 a year, with unlimited workspaces, 10 GB of storage, 10 GB of egress a month, and backups kept for 30 days with point-in-time restore.

No plan uses per-seat pricing. Data can be exported at any time, and Postware states that it is never sold or used to train AI. The plan comparison sets the Free row against the Pro row, next to the repeated lines "Sign up free," "Copy agent prompt to start," and "No card needed."