ERPStack modules: accounting, inventory, CRM, HR and more
The modules planned for ERPStack, what each one must do for an Indian business and how they will work from one set of records.
Last updated 21 October 2026
Which modules will ERPStack have?
ERPStack is planned as six connected modules for Indian small and mid-sized businesses: accounting, inventory, CRM, manufacturing, HR and payroll, and GST billing. They will share one set of customers, items and ledgers, so a sale updates stock, posts to the accounts and feeds GST returns without being entered twice. Each guide below explains what that module must do.
Where ERPStack is today
ERPStack is in development. It is not yet available to download or buy, and the features on this page are planned, not shipped.
Sign upWhat does each ERPStack module cover?
| Module | What it covers |
|---|---|
| Accounting | Ledgers, GST input tax credit and GSTR-2B matching, TDS, bank reconciliation, audit trail |
| Inventory | Stock by godown, batch and serial, expiry, reorder levels, valuation, challans and e-way bills |
| CRM | Leads from WhatsApp and marketplaces, pipeline, follow-ups, quotes that become GST invoices |
| Manufacturing | Bills of materials, work orders, material issues, output and costing |
| HR and payroll | Employee records, attendance, leave and payroll |
| GST billing | Tax invoices, credit notes, delivery challans, e-invoices and e-way bills |
Which module should a business start with?
| If your main problem is… | Start with |
|---|---|
| Invoices typed by hand or in a spreadsheet | GST billing |
| Stock in the system never matches the shelf | Inventory |
| GST returns that do not agree with the books | Accounting |
| Enquiries lost between phones and inboxes | CRM |
| Not knowing what a product costs to make | Manufacturing |
| Attendance, leave and salaries in separate files | HR and payroll |
How will the ERPStack modules work together?
ERPStack is an ERP for Indian small and mid-sized businesses that Perimattic is building. The plan is for every module to work from the same customers, items, GSTINs and ledgers:
- A sale raised once updates stock, posts to the accounts and feeds GST return data.
- Purchases and production move stock and cost in the same step.
- Payroll posts salary costs to the ledgers.
Status: ERPStack is in development and none of these modules is available to use yet. Sign up and tell us which module you need first.
Read the module guides
ERPStack modules, answered
Can I use just one ERPStack module?
That is the plan. Each module is being designed to be useful on its own, such as billing or inventory, with the others added later on the same records. ERPStack is in development, so none of the modules can be used yet; signing up is the way to say which one you need first.
What is the difference between an ERP module and separate software?
Separate tools each keep their own list of customers, items and transactions, so the same sale is typed into billing, stock and accounts. Modules of one ERP share those records: an invoice raised once reduces stock, posts to the ledgers and feeds GST returns.
Is ERPStack available to buy or download?
Not yet. ERPStack is in development while Perimattic builds it, and every feature described on these pages is planned rather than shipped. There is no published price yet, and nothing can be bought. Sign up to follow the build and to be told when it opens.
Want ERPStack built around how your business bills?
Sign up to tell us what you need, follow the build and be first to try ERPStack when it opens.
Sign up