There are a few hundred products answering to sales billing software and their feature lists are almost identical, which is why comparing them is so unsatisfying. The things that actually decide it are not on those lists. This page covers those instead.
The four questions that actually narrow it down
Feature lists do not distinguish billing products, because they all have the same features. These four answers do.
How does a bill get raised? At a counter with a queue, seconds per bill is the only thing that matters. On a site or after an event, the detail matters and the speed does not. Monthly against a connection or a contract, it is a schedule and what matters is that last month is remembered.
How many people bill? One person can use anything, including a spreadsheet. Two people need one shared record and one centrally issued numbering series, and that single requirement rules out every file-based approach.
What has to come out at the end of the month? An invoice total, or GSTR-1 and GSTR-3B figures, or a full set of accounts. These are three different products and buying the wrong size is the usual mistake.
What happens when the internet drops? If the answer is "billing stops and that is a disaster", you want installed software and no amount of cloud enthusiasm should change that.
Billing as the front of the sales process
For most small businesses the invoice is the last step of a sequence that started with an enquiry, and the sequence is worth keeping joined up — not for neatness, but because the retyping between steps is where price discrepancies come from.
The clean shape is: a quotation with the lines and the price, converted to an invoice when the work is won with nothing retyped, and then the payment applied against that invoice. Each step carries the lines forward, so the figure on the bill is the figure that was agreed.
Where this breaks is the usual place: the quotation lives in one file and the invoice in another, so somebody types the lines again. Then the customer is comparing two documents that do not match, and the conversation is about the discrepancy rather than the payment.
Keeping the quotation out of the invoice number series matters too. A quotation is not a tax invoice, it creates no liability and supports no credit claim, and numbering it as one puts a hole in a series that has to be consecutive.
What you get, free
- Complete GST tax invoices — every legally required field, tax split per line, not a template with a tax box.
- Customers stored once with GSTIN, address and state.
- Items stored once with HSN or SAC, rate and tax.
- Tax derived, not chosen — CGST and SGST or IGST, from the place of supply against your registration state.
- One numbering series, issued centrally, consecutive within the financial year.
- Stock that moves as you bill, so a closing figure means something.
- A receivables position — who owes what, aged, without adding anything up.
- PDF invoices to print, email or send on WhatsApp.
- Full export to CSV, Excel and JSON, on every plan including the free one.
- ₹0 — no card, no expiry, not a trial.
Getting started, properly, in about ten minutes
- Start free now — an email address and a password. No card, nothing to install.
- Enter your business name, address and GSTIN once. These are the fields you have been retyping.
- Add your items with their HSN or SAC codes and their own rates, or import the list from a spreadsheet.
- Add the customers you bill regularly, with GSTIN and state where they are registered.
- Set the number your invoice series should carry on from, so nothing restarts in the middle of a financial year.
- Raise a real invoice — the number, the tax split and the totals come filled in.
- Print it on your own printer and export everything, so you know both ends work.
The numbering series, which is where file-based billing fails
The rule is short: a consecutive serial number, unique within the financial year, not more than sixteen characters, using only letters, numbers, hyphens and slashes. One series, or clearly separated series where you genuinely need more than one, each consecutive in itself.
A file cannot enforce any part of that. The number is typed, so it can be repeated, skipped, or quietly rolled back when yesterday's invoice is edited into today's. Nothing notices, and the duplicate is found at return time rather than at billing time — a month after it happened, when the customer already holds their copy.
The forgotten half is cancellation. A cancelled invoice keeps its number and stays in the series as cancelled. Deleting the row and reusing the number leaves a gap in your books and a figure in your customer's, and reconciling those two is a long afternoon with a bad ending.
This is the most practical argument for a system over a file and it has nothing to do with features. It is the one thing a file structurally cannot do.
What this product is not for
Worth saying directly, because every page in this category is written the other way round and it wastes people's time.
It is not full double-entry accounting. There is no chart of accounts, no journal entries, no bank reconciliation and no balance sheet. It produces clean exportable figures for an accountant who does that work.
It is not an ERP. No production planning, no bill of materials, no payroll, no approval hierarchies across departments.
It is not installed software. It runs in a browser and needs a connection to issue a bill, so a counter that loses internet for hours should choose something local.
And it does not integrate with hardware beyond a printer and a USB scanner — no weighing scales, no fuel dispensers, no serial-port cash drawers. If something at your counter has to speak to the software directly, that decides it.
What it does do is the shared middle: correct GST documents, a numbering series that holds, tax computed rather than typed, stock, receivables, and figures a return can be built from.
Credit notes, debit notes, and fixing a wrong invoice
An issued tax invoice is not something to edit. If the value was too high, or goods came back, the correction is a credit note that references the original invoice. If it was too low, a debit note. Both carry their own numbers and both appear in your return.
There is a deadline on the credit note that matters: the adjustment has to be declared by the return for the relevant month of the following financial year, or by the annual return, whichever comes first. Past that, the note exists commercially but the tax cannot be adjusted.
Software that lets you quietly retype an invoice raised last month is not doing you a favour.
Reverse charge, exports and the supplies that behave differently
Not every supply is a straightforward taxable sale. Some notified supplies put the tax liability on the recipient rather than the supplier. Exports and supplies to an SEZ can be made under a bond or LUT without payment of tax, or with tax and a refund claimed afterwards. Composition dealers cannot charge tax at all and must say so on the bill.
Each of these changes what the invoice has to say — the reverse charge marking, the LUT reference, the "composition taxable person" declaration. They are not exotic cases; most businesses hit at least one.
The fields are on the invoice in Billixo whether or not you use them, so the day you need one you are not looking for a workaround.
The AI, and what it is actually for
The useful application of AI to billing is not a chatbot. It is the twenty minutes a day spent retyping things that already exist on paper.
- Scan a supplier bill. Photograph it; the lines, the GSTIN, the tax and the totals come back as a draft you check rather than a form you fill.
- Find the HSN code. Describe the product in plain words and get a code to confirm, instead of scrolling a list of eleven thousand.
- Ask about your own numbers. "What is outstanding over sixty days?" answered from your data, not a manual.
- Write the reminder. A polite, specific chase for an overdue invoice, ready to send on WhatsApp.
Nothing is sent anywhere until you ask for it, and the platform runs on whichever model it has been configured with — including one hosted on your own server.
Where this fits in a working day
Morning: yesterday’s supplier bills get photographed and become purchase records. Through the day: invoices go out as goods do, shared on WhatsApp before the customer has left. End of the week: the receivables list says who to call. End of the month: the GST summary is a download, not a project.
None of that requires a new habit, which is the point. A billing system that needs discipline to work is one that stops working the first busy week.
The price, plainly
Free is ₹0 and stays ₹0. The paid plans are bought for a fixed term, paid once, with no auto-renewal and no card kept on file — when a term ends the account drops back to Free until you decide to buy again.
There is no per-invoice charge, no per-user surprise on the free plan, and no feature that is technically included but practically throttled. What the plan says you get is what you get.
Compare the plans on the home page, or just start free now and look at the ceiling from the inside.
Where your data lives
On the server this platform is installed on. Every record carries a company identifier and every query is scoped to the signed-in account at the framework level, so one business cannot read another’s data by any route, including a crafted one.
Sign-in is rate limited, sessions can be restricted to one device per user, and passwords are stored hashed. Exports are available on every plan, free included: if you ever want to leave, your data leaves with you.
Frequently asked questions
Can I get my data out again?
Yes, on every plan including the free one — CSV, Excel and JSON, in full, whenever you want. Records you cannot export are not records you own, so it is not something to put behind a payment.
How long does it take to set up?
About ten minutes to raise a first real invoice, and longer only if you are importing a long item list. The half hour worth spending is testing it with your own items and your own printer before you commit anything to it.
Is it really free, or is it a trial?
The Free plan is ₹0, needs no card and has no expiry. It carries volume limits, one login and a small watermark on the PDF. Separately, every new account gets the full paid feature set for its first fortnight so you can see the ceiling — when that ends nothing is charged and nothing is deleted, the account just settles onto Free.
Can more than one person use it?
On the paid plans, yes — team logins with their own credentials. The Free plan is a single login, which suits a one-person operation and is usually the first limit a growing business hits.
Is my data shared with anyone?
No. It sits in this installation, scoped to your company. AI requests only happen when you explicitly ask for one, and nothing is sent anywhere otherwise.
See it working on your own bills
The fastest way to judge billing software is to bill with it. Photograph one supplier invoice, raise one sales invoice, and look at the PDF your customer would receive.
Open the software demo → — free account, no card, about a minute to set up.
More details on the home page → — what it does, what it costs, and where the limits are.
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