How long can I operate offline with Mercora?

Indefinitely. No hour or day limit. The terminal keeps working as long as the cashier has the device powered on.

What happens if two cashiers sell the same SKU offline?

On sync, Mercora detects the conflict and flags for manager review with visible audit log. You can configure per-SKU safety buffers to prevent offline overselling.

Does e-invoicing work offline?

Issued with provisional folio and on sync it validates with local tax authority. If real-time folio is required, it queues until reconnect.

Does it work on Android, iOS or only Windows?

Mercora runs on web (any modern browser), Android and iOS. Offline mode is native on all platforms.

Total operational continuity

POS that keeps billing even when the internet drops

Mercora operates 100% offline when needed. Each transaction is encrypted on the terminal and syncs automatically on reconnect — no duplicates, no losses.

For SMBs in zones with unstable connectivity: the cashier never says 'I can't bill, the system is down'.

100% offlineAuto syncNo duplicatesMulti-cashierMulti-store

Real offline POS: why it matters for emerging-market SMBs

Internet in Latin America and other emerging markets does not behave like in the US or Europe. In Costa Rica's Central Valley, in towns across Peru or Colombia, in industrial parks in Mexico or weekly fairs in Central America, 10, 20 or 60-minute outages are routine. A cloud-only POS that freezes during those minutes is not a minor inconvenience: it is a structural revenue loss that accumulates month after month. Mercora addresses this pain with a real offline mode, designed into the architecture itself, not bolted on as a workaround.

The difference between real and degraded offline is critical. A cloud-only POS in 'degraded' mode lets you take cash but does not generate an invoice, does not update inventory and does not print a valid receipt. When internet returns everything has to be entered manually — a slow, error-prone process that cashiers often simply skip. Mercora operates self-sufficiently: catalog, prices, taxes, permissions and folios live encrypted on the terminal. Each offline transaction saves with timestamp, integrity hash and cashier signature, ready to sync when connection returns.

On reconnect, the transaction queue uploads chronologically to the server. The system detects potential conflicts (for example, two cashiers selling the same SKU offline when only one unit existed), flags them for manager review and leaves reconciliation with visible audit. This means no sale is lost, no invoice duplicates and the manager can review exactly what happened during the outage. For SMBs with multiple branches, each terminal operates independently offline and they all converge when internet returns — the corporate catalog stays consistent.

The financial impact is direct and measurable. An auto parts shop averaging 20 tickets/hour suffering 4 hours of outages per month recovers 80 tickets that simply did not exist before. A 24/7 on-duty pharmacy stops sending customers to competitors during overnight outages. A 5-branch franchise avoids operational chaos when one location's fiber fails. Mercora's offline mode is not just another feature on the list — it is the difference between a POS suitable for emerging markets and one designed for perfect connectivity.

See the full platform — Mercora

The problem

Unstable internet costs you real sales

A 20-minute ISP outage during peak hours means dozens or hundreds of lost tickets. And cloud-only POS systems become useless.

Cloud-only POS that freezes without internet

Cashier asking the customer 'pay cash, the system is down'

Frustrated customers abandoning their carts

Manual double-entry after restore, with errors

No invoicing possible during the outage

Real cost of an internet outage:

20-80 lost tickets per hour

Customers who don't return

Post-outage double-entry

Untraceable cash leakage

The solution

Real offline mode, not degradedor a temporary hack

Mercora is architected from the ground up to operate offline indefinitely without compromising data integrity.

Self-sufficient terminal

Catalog, prices, taxes and permissions cache locally encrypted. The cashier operates identically with or without internet.

Encrypted transaction queue

Every sale, refund and cash movement saves locally with timestamp and signature. Tamper-proof.

Automatic sync on reconnect

When connection returns, everything uploads to cloud chronologically without duplicating or losing a single record.

Smart reconciliation

If conflicts occurred (e.g. another cashier sold the same SKU offline), the system detects and resolves them with visible audit.

How it works

How the offline-first mode works

Initial setup with full cache

On activation, Mercora downloads catalog, prices, permissions, taxes and folios.

Encrypted local cache

Normal operation with continuous sync

While online, each transaction uploads in real time. Cache always current.

Live sync

Automatic outage detection

When ping fails, Mercora switches to offline mode without the cashier noticing.

Transparent failover

100% local billing

Cashier keeps billing: split payments, PIN-authorized refunds, printed receipt. All local.

Zero interruptions

Queue of pending events

Each offline transaction queues with timestamp and hash. Visible to the manager.

Auditable queue

Ordered sync on reconnect

When internet returns, the queue processes chronologically. Automatic conflict reconciliation.

Smart sync

Key capabilities

Enterprise offline capabilities

Indefinite offline operation

Hours or days without internet — the terminal works the same. No offline time limit.

Simultaneous multi-cashier offline

Multiple cashiers operate offline in the same store. Each with its own queue; reconciled on sync.

Local stock with safety margin

To prevent offline overselling, set per-SKU buffer. If available stock is lower, sales are blocked.

Thermal printer functional offline

Receipt prints locally with provisional folio, replaced on sync if needed.

Planned offline mode

If you know internet will fail (maintenance, move), enable offline manually to avoid latency.

Sync health reports

Dashboard showing pending queue, accumulated offline time, resolved conflicts.

Result

From paralyzing outages to continuous operation

Before

20-80 lost tickets per outage hour

Cashier saying 'system is down'

Error-prone post-outage entry

Frustrated customers walking away

After

Zero lost sales from internet

Cashier operates identically online or offline

Auto sync without duplicates

Customer never notices the outage

Your internet can drop 5 times a day — your billing never stops

Use cases

Who needs offline most?

SMBs in weak-internet zones

Small towns, industrial parks, markets — anywhere internet is intermittent.

Pop-up commerce at events and fairs

Trade show stands, food trucks, field sales — where no reliable WiFi exists.

Multi-store with remote branches

Rural or hard-to-reach branches where a fiber outage means 2 hours of no service.

Critical 24/7 operations

On-duty pharmacies, gas stations, businesses where any outage is unacceptable.

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