Product
GST Invoice App for Android (2026): What a Billing App Must Do, and How TripleBill Does It
A GST invoice app on a phone is often the only software a small business ever uses. That makes the choice matter more than the price: it decides whether your invoices are legally complete, whether billing continues when the network drops, and whether your CA gets usable figures. Here is what to check, followed by how the TripleBill Android app handles each point and where it still falls short.
Key takeaways
- A compliant GST invoice needs your GSTIN, a sequential number, date, buyer details (GSTIN for B2B), HSN/SAC per line, taxable value, the CGST/SGST or IGST split, and the total. The app must fill these automatically.
- Offline billing with later sync is the difference between an app and a website wrapper. Counters lose connectivity every week.
- Free options that last: TripleBill (free plan, all features) and Vyapar (free for one user on mobile). Most others are trials.
- The TripleBill Android app is a direct APK download today; the Google Play listing is pending. iOS is not available yet.
The eight things a GST invoice app must do
- 1Decide CGST/SGST vs IGST from the customer’s state, not from a checkbox you might forget.
- 2Carry an HSN or SAC code and a GST rate on every item, and print them per line.
- 3Number invoices sequentially per financial year, with no gaps and no reuse.
- 4Separate B2B (buyer GSTIN present) from B2C automatically so GSTR-1 comes out right.
- 5Keep billing offline and sync sales when the network returns, without duplicating bills.
- 6Print a 58 mm or 80 mm receipt and share a PDF or link on WhatsApp.
- 7Track stock as you bill, with low-stock alerts and purchase entries that add stock back.
- 8Produce GSTR-1, GSTR-3B and HSN summary figures, or at least an export your CA can use.
Free GST invoice apps, compared
| App | Free plan | Offline billing | Thermal print | GST reports on free | Store |
|---|---|---|---|---|---|
| TripleBill | Yes, all features, no expiry | Yes (queue + sync) | 58/80 mm via the Android print dialog | GSTR-1, 3B, HSN | Direct APK (Play pending) |
| Vyapar | Single user | Yes | Yes | Basic on free; more on paid | Google Play |
| myBillBook | 14-day trial | Yes | Yes | Paid | Google Play |
| Swipe | Free tier | Not listed | Yes | Basic | Google Play |
| Zoho Invoice | Free | No | No (PDF) | Invoice-level | Google Play |
Checked 16 Sep 2026 from each vendor’s site and Play listing. Feature availability by plan changes.
How the TripleBill Android app works
The app is a billing counter that fits in a pocket. Open Billing, scan a barcode with the camera or tap a product tile, adjust quantities, pick a customer or leave Walk-in, take cash, UPI or card (or split), and print or share. Every sale becomes a GST invoice in the same books as the web app, so the shop owner on a phone and the accountant on a laptop see one set of numbers.
Offline: the app caches your catalog and keeps a queue of sales made without network. Each queued sale carries a client transaction id, so when it syncs the server never bills it twice. Purchases, expenses and reports need connectivity; billing does not.
Triple AI is in the app too: photograph a supplier bill or receipt and it drafts the purchase or expense for review; ask "how much did I sell today" and it answers from your data.
- Documents: invoices, quotations, proforma invoices, sale orders and delivery challans
- Customers and items with extras (GSTIN, state, credit limit, HSN, barcode, discount)
- Inventory with stock counts and adjustments
- Purchases and expenses, including AI scan from a photo
- Reports: sales, GST, party balances, stock; download Excel/PDF
- Multi-branch and counters; staff sign in with their own role
What the app does not do yet
- It is not on Google Play yet; you install the APK from our download page and allow installs from that source. The Play listing is in progress.
- No iOS version.
- No e-invoice IRN generation.
- No batch/expiry tracking for pharmacies.
- Reports and purchases need internet; only billing works offline.
Installing an APK outside the Play Store is safe only from a source you trust. Download TripleBill only from triplebill.app/download, check the file size and version on that page, and never from a forwarded link.
Setting up the app in ten minutes
- 1Download the APK from triplebill.app/download on your phone and open it; allow the install when Android asks.
- 2Sign in with the same account as the web app, or create one. Complete business setup: name, state, GSTIN.
- 3Add items with GST rate and HSN, or import from Excel on the web and they appear on the phone.
- 4Install your printer’s Android print service (most thermal printer makers publish one), then print a test receipt from a sale.
- 5Bill your first sale, then check Reports → GST to see it in GSTR-1.
Frequently asked questions
Which is the best free GST invoice app for Android?+
TripleBill offers a free plan with all features including POS, offline billing and GSTR-1/3B reports. Vyapar is free for a single user on mobile. Zoho Invoice is free for invoicing without stock.
Can a GST invoice app work offline?+
Some can. TripleBill and Vyapar keep billing offline and sync later; cloud-only apps such as Zoho Invoice need connectivity.
Is the TripleBill app on Google Play?+
Not yet. It is available as a direct APK download from triplebill.app/download; the Play listing is pending.
Can I print invoices from a phone?+
Yes. TripleBill formats 58 mm and 80 mm receipts and prints them through the Android print dialog, which works with any printer that has an Android print service; it also shares PDF invoices on WhatsApp.
Does a mobile billing app produce GST returns?+
The better ones produce GSTR-1, GSTR-3B and HSN figures. TripleBill does on the free plan; you or your CA file them on the portal.
About the author
Written by the TripleBill team, the people who build the billing and accounting software this site is about. We check competitor prices on their own websites on the date shown above, and we say so when our product is the weaker choice. This article is general information, not tax advice.
Bill from your phone, free.
Offline billing, receipt printing and GST reports on Android. Direct download today; Play listing coming.
Read next
Related pages