Define agentic logic once
...use it from anywhere

A plugin is written once in plain TypeScript and Markdown. From the same package it serves chatbots, autonomous agents, vibe-coding tools and traditional software over MCP, OpenAPI/REST, Agent Skills and the Agent Plugins package format:

  • Tools: MCP tools and a REST API, with schemas generated from the TypeScript types
  • Widgets: real user interfaces inside Claude, ChatGPT, M365 Copilot and other MCP Apps hosts
  • Agent Skills and Agents: the know-how and agent definitions next to the tools
  • Prompts: guided starting points for interactive chat
  • Auth built in: anonymous by default, standard OAuth2 when needed

Quartal Plugins is open source (MIT) and built on open standards, so there is no lock-in. Read more and build your own at plugin.quartal.com.

Quartal Plugins: business logic created by you, served as tools, widgets, skills, agents, prompts and auth to chatbots, autonomous agents, vibe-coding tools, corporate systems and software

Quartal Hub

The Financial Management plugins by Quartal, on Quartal Hub.

Quartal Invoicing

Production

Easiest Invoicing you have ever used.

Quartal Expenses

Production

Expenses and Payments without hassles.

Quartal Banking

Production

Payments and bank statements digitally.

Quartal Accounts

Production

Accounting Software redefined for 2025.

Quartal Customers

Production

Light CRM for SMEs.

Quartal People

Production

GDPR-compliant customer, employee & payroll management.

Quartal Hub

Production

The central repository for the data that UI components and agents monitor and modify, with real-time notifications.

Quartal IAM

Production

Identity and Access Management for Financial Management: people, companies and agents.

Salaxy Payroll

People and payroll plugins in cooperation with Salaxy: the real-time, open API payroll software for ERP, HRM and financial management.

Salaxy Payroll

Test

Run payroll by asking: your AI assistant calculates salaries, prepares the monthly payroll, keeps employment details up to date and gets everything ready for payment.

Salaxy Import

Test

Manage payroll data imports by asking: source files, transformations, converted datasets, import plans and import runs.

Salaxy Configuration

Pilot

Payroll configuration tools for AI agents.

Salaxy Reporting

Pilot

Payroll reporting tools for AI agents.

Salaxy Anonymous API

Production

Salary calculations without a Salaxy account: for learning, testing and development.

Community

Open source and third party: plugins for other financial management software, open data and third-party services.

Visma Netvisor

Pilot

One of the most popular financial management software in Finland, chosen by over 40,000 Finnish companies.

Finago Procountor

Pilot

One of the most popular accounting software in Finland.

Fennoa

Pilot

Complete electronic financial management that saves time for both the accounting office and its customers.

Easor

Pilot

Bookkeeping for small businesses: easy software and your own accountant at a fixed price.

AI Fintek: FinAI

Pilot

An AI agent that interprets receipts for bookkeeping.

PRH Open data

Production

Financial statement figures (income statement and balance sheet in XBRL) and registered notices of Finnish companies.

Visma Sign

Production

Electronic signatures.

Ready to start with plugins?

Find all our plugins in Quartal Hub. Open now for registrations to Early adopters.

If you want to create your own plugin, get started for free at plugin.quartal.com.

Open Quartal Hub Create your own plugin