About INTSORA
Our aim: every invoice right before it reaches the IRP
INTSORA is building software for accountants at manufacturing companies that reads invoice PDFs, checks them and prepares the e-invoice, so that nothing has to be typed twice.
What we are trying to achieve
An invoice is typed once
Your sales invoice already exists, in your billing software or as a PDF. Getting it to the IRP should not mean typing it again.
Errors are caught before you upload, wherever that is possible
The IRP tells you about a problem only after you upload, in its own wording. We want you to see what can be caught in advance, in plain words and with the fix. Some things only the IRP can check, and we say which.
Nothing is hidden
When our software is unsure of a value, or could not run a check, it must say so. A tool that hides its doubts cannot be trusted with compliance work.
What our three words mean
Intelligent.
The software does the reading and the checking. The judgement stays with you.
Integrated.
The invoice, the checks and the e-invoice belong on one screen, not in three tools.
Evolving.
GST rules change. The checks should change with them, so that your way of working does not have to.
Where we are today
The free IRP pre-check on this site is the first piece, and it is live. So are the pages that explain IRP error codes.
The product that reads invoice PDFs is being built and tested. It is not open yet.
When it is ready, we will open it to a small group first. If you want to be in that group, write to us.
How we work
- We use the rules and lists that NIC and GSTN publish, and each finding names where it comes from.
- We say plainly what we cannot check.
- The pre-check runs inside your browser, so the file you check never reaches us.
- INTSORA is not affiliated with GSTN or NIC. Only the IRP can accept or reject an invoice.
- We are a small team in Pune, and we answer our own email.
Sources
These are the published lists the pre-check and the error pages are built from, with the date we last read each one. The checks themselves follow NIC's published validations for generating an IRN and its e-invoice schema.
| List | Published at | Read on |
|---|---|---|
| IRP error codes (NIC) | einvoice1.gst.gov.in | 1 October 2026 |
| E-invoice master codes (NIC) | einv-apisandbox.nic.in | 1 October 2026 |
| State codes | einvoice.gst.gov.in | 1 October 2026 |
| PIN code to state pattern | einvoice.gst.gov.in | 1 October 2026 |
| Unit codes (UQC) | einvoice.gst.gov.in | 1 October 2026 |
| GST rates | einvoice.gst.gov.in | 1 October 2026 |
| HSN and SAC codes (GSTN) | services.gst.gov.in | 1 October 2026 |
Contact
Write to [email protected]. We are in Pune, India.