Vendra

Self-hosted POS and inventory that will not sell below zero recorded stock, even when two tills sell the last unit at the same moment.

The problem it solves

Retail shops, cafés, and market stalls need stock counts they can trust and profit numbers built from recorded cost — but cheap POS scripts fall apart on exactly that: counts drift, overselling happens, and margin reports become fiction because cost isn't tracked properly.

• Stock counts that drift from what's actually on the shelf
• Overselling the last unit when two cashiers ring up at once
• Profit reports built on a guessed cost of goods

Every feature

• Email the customer their receipt. A receipt can go to the customer by email — through your own SMTP, off until you switch it on, and the printed or on-screen receipt keeps working with no SMTP at all.
• The day-close report, in your inbox. Closing the drawer can email you the Z-report — takings by tender, the counted difference, the day's numbers — so the record exists outside the till the moment the day ends.
• Oversell-proof checkout. Overselling is enforced at the database level, even when two cashiers sell the last unit at the same instant.
• Append-only stock ledger. Every stock change — sales, purchases, returns, adjustments — posts to an auditable movement ledger with cost, reference, and who did it.
• One-click ledger verification. Rebuild every stock count from the ledger and flag any mismatch.
• Weighted-average costing. Drift-free integer-math costing updates on every purchase, so profit reports use the cost you actually recorded.
• Barcode-ready POS screen. Fast product grid with category tabs, keyboard-wedge barcode scanning, split payments, and hold & resume sales.
• Full store operations. Purchases and receiving, returns, register sessions with Z-report, and reports by product and cashier.
• Installable mobile app (PWA). Add it to a phone or tablet home screen straight from the browser — a full-screen app served from your own server, with no app store involved. Business data is not stored offline on the device; what you see is read live.
• Works with Restock and Loyalora. Connect your own Restock and every sale and refund updates its sales history and shelf counts, so the reorder list follows the till. Connect Loyalora and a member's sale earns points by what was spent, with the balance shown at the till.
• The till never waits on them. The sale is recorded first; an app that is down costs one short wait, and anything that did not arrive is listed in a log.
• Count your stock, while you keep selling. Scan or type a shelf, post the differences with a reason; a sale during the count is never lost or counted twice.
• Real margins, freight included. Spread a delivery's freight, duty and fees into what each item cost you.
• Barcode labels. Print price labels on A4 or US Letter sheets or a label printer, even for items that came without a barcode.
• Recipes and bundles. Sell a latte from cups, shots and milk, or a gift box from what is in it; the parts come off the shelf.
• A screen for the customer. A tablet shows the basket, the total and the change as you ring it up.
• Scan to adjust stock. Choose add or take off and a reason, then scan: a breakage, a find or a return goes on the ledger in one scan, and stock never goes below zero unless you allow it.
• Updates from inside the app. The Updates page installs a new release with your license key: Ownware's signature is checked, a backup is taken first, and the app puts the previous version back by itself if the update is interrupted or the database step or start-up check of the new version fails. It never checks by itself.
• Backups by themselves. Automatic backups, an optional copy to S3-compatible storage you own, and a weekly check that the latest backup reads back. The Health page names anything that needs attention.
• Switch from Square. Upload Square's item library and customer directory. A switch report checks every row with Vendra's own rules before one Import button brings them across, and importing the same file again adds nothing.
• Own It 4.0.1 — fixes and an up-to-date manual. For Vendra, 4.0.1 fixes an installer that had lost its styling, a rollback that a page opened during an update could stop and a command-line update that ended in an error after putting the previous version back. Its manual, FAQ and QUICKSTART now cover everything 4.0 added, including two Nginx rules that keep the data folder private. Your license covers it: press Check for updates on the Updates page, or download it from your order page.
• Own It 4.0.2 — the installer opens on every host. For Vendra, 4.0.2 fixes a fresh install on an Apache host: the one-page setup at /install/ looped back to itself and never opened, and now it opens. Your license covers it: press Check for updates on the Updates page, or download it from your order page.

Release notes in full

• Own It 4.1: client installations and your other tools. For Vendra, 4.1 makes two changes that every app gets. An Extended license bought from October 4, 2026 covers up to ten client installations, one per client project: hand each one over to the client or host it for them, with the client's logo and colors from the app's branding settings. The API reference now shows how to connect Vendra to Zapier, Make or n8n, using its own webhooks and API key. Your license covers the update: press Check for updates on the Updates page, or download it from your order page.
• Own It 4.0: it updates and backs itself up. For Vendra, 4.0 means updates from inside the app: the Updates page checks for a new release with your license key, verifies Ownware's signature, takes a backup and puts the previous version back by itself if the update is interrupted or the database step or start-up check of the new version fails. A new install can start with a sample business and remove it in one click; backups run by themselves, with an optional offsite copy and a weekly check that the latest one reads back; and the Health page says whether the install is looking after itself. It also switches you over from Square: the item library and the customer directory.
• Own It 3.3: stock moves at the scanner. 3.3 puts stock corrections at the scanner: choose add or take off and a reason, then scan, and a breakage, a find or a return goes on the ledger in one scan. Stock never goes below zero unless you allow it.
• Own It 3.2: the shop floor, connected. 3.2 connected Vendra to the rest of the shop: every sale and refund updates your own Restock, a member's sale earns Loyalora points, and the till never waits on either. On the floor it brought stock counts while you keep selling, barcode labels, recipes and bundles, a screen for the customer, and real margins with freight included. Receiving stock became scan-to-receive, with the margin shown before you receive.
• Own It 3.1: it writes to the people you serve. The 3.1 wave gave the catalog a way to reach the other side of the transaction: counterparty email through your own SMTP server, calendar feeds your own calendar subscribes to, attachments filed where the paperwork belongs, and export presets other people's software imports. Each outbound feature ships switched off and runs on your own credentials; a failed send is recorded, and the action that triggered it stands. What this app gained is listed at the top of this section.
• Own It 3.0: works for your AI, not just for you. An MCP endpoint lets an agent list products, check stock, pull a sales report and record a sale — through the same checkout the till runs, so stock still cannot oversell and a sale still needs an open register. The POS gains camera barcode scanning straight from the browser.
• Own It 2.0: API, 2FA, backups, dark mode. Vendra 2.0 adds the 2.0 owner layer. Upgrade by replacing the files — the database migrates itself, and it is still the same one-time purchase.