Searches like open source billing software are really a question about delivery: do I install this, or open it in a browser, or get it from a store? The answer changes what happens when your laptop dies, when the internet drops, and when a second person needs to bill. This page is straight about all three.
Installed, cloud, or app — the difference that matters
There are three ways billing software reaches you and they fail in different ways, which is the only comparison worth making.
Installed software runs on one machine and keeps the data there. It works with no internet, it is fast, and it is yours. It also dies with that machine unless you are taking backups, it is awkward to use from anywhere else, and sharing it between two people means a network setup or a second licence.
Cloud software runs on someone else's server and you open it in a browser. Nothing is stranded on a laptop, two people can use it at once, there is nothing to install or update, and a dead machine costs you a machine rather than your records. It needs a working connection to do anything at all, and your data is somewhere you do not control — which makes export the thing to check before you commit.
An app is usually one of those two with a phone-shaped front end. The question to ask about an app is where the data actually is: on the phone, or on a server the phone talks to. If it is on the phone, a lost phone is a lost business.
Open-source billing: what it is good for, and what it costs
Open-source billing software is real, mature and free of licence cost. If you want control, no vendor dependency and the ability to change what the software does, it is the honest answer and this product is not it — this is a hosted commercial product with a free plan, not open source.
What open source actually costs is not money. You host it, which means a server, a database, backups you have tested, TLS certificates and updates applied when a security fix lands. Something has to fail over when the machine does. If nobody at your business does that comfortably, the cost arrives later as downtime or as a breach, and it lands on the day you least want it.
The sensible test is to ask who will apply the next security patch and what happens if that person leaves. If there is a clear answer, open source is a strong choice. If the answer is "we would figure it out", it is a liability with a zero price tag on it.
For a GST-specific need there is a second question: how closely does the project track Indian compliance changes — the return formats, the e-invoicing schema, the HSN requirements? Generic international invoicing projects often do not, and the gap becomes yours to fill.
What the free plan actually includes
- Complete GST tax invoices, every legally required field, tax split per line.
- Nothing to install — a browser on any computer, tablet or phone.
- Customers and items stored once, with GSTIN, state, HSN or SAC and rate.
- One numbering series, issued centrally and consecutive within the financial year.
- Stock that moves as you bill.
- A receivables position — what is unpaid, aged, per customer.
- PDF invoices to print, email or send on WhatsApp.
- Full export to CSV, Excel and JSON, on every plan including this one.
- ₹0 — no card, no expiry, not a trial.
Trying it in five minutes
- Start free now — an email address and a password. No card, no download.
- Enter your business name, address and GSTIN.
- Add two or three of your own items with their HSN codes and rates — ideally at two different rates.
- Raise a real invoice and check the tax computed per line.
- Print it on the printer you actually use, or share the PDF to your own phone.
- Raise a second one and confirm the number advanced by itself.
- Export everything and open the file, so you know you can leave.
The hardware question, answered honestly
Browser-based billing works with ordinary hardware, with one real caveat worth knowing before you buy anything.
Printers work the way they work for any web page: if your computer can print to it, this can print to it, including a thermal roll printer with the right paper size set. A USB barcode scanner behaves as a keyboard, so it types the code into the field — nothing special is needed. A phone or tablet works for billing but is poor for printing.
The caveat is deep hardware integration. A browser cannot talk directly to a weighing scale, a fuel dispenser, a cash drawer on a serial port or a card terminal. If your counter depends on the scale posting a weight into the bill, that needs installed software with a driver, and no web application will do it.
So the test is not "will it work with my printer" — it almost certainly will. It is "does anything at my counter need to speak to the software directly". If something does, that decides it.
Where your data is, and how to stay able to leave
With installed software the data is on your machine, and the risk is losing it — a failed disk, a theft, a reformat. With a hosted system the data is on a server, and the risk is different: not losing it, but not being able to take it with you.
The protection against the second is export, and it is worth being specific about what good export looks like. Everything, not a summary. A format you can actually open — CSV, Excel or JSON rather than a proprietary archive. Available whenever you want it rather than on request. And on every plan, because an export that requires a payment to use is a lock.
The question to ask any vendor is what happens to your records if you stop paying. "They are deleted" and "the account is locked" are both answers that should end the conversation for a business keeping statutory records.
Here, export is on every plan including the free one, and the free plan does not expire — so an account cannot lapse into a state where your own records are unreachable.
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
Is the free plan a trial?
No. The Free plan is ₹0 with no card and no expiry, and plenty of small businesses stay on it. Every new account also gets the full paid feature set for its first fortnight so you can see the ceiling, and when that ends nothing is charged and nothing is deleted.
What happens to my data if I stop using it?
It stays exportable. Export to CSV, Excel and JSON is on every plan including the free one, which does not expire — so you are never in a position where your own records are locked behind a payment.
Is there an installer or a setup file to download?
No. It runs in a browser, so there is nothing to install, nothing to update and nothing tied to one machine. If you specifically need installed software with a local database, this is not the right product and installed alternatives are a reasonable choice.
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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