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BillPlex — Help Center

Last updated: October 23, 2025

Getting Started

Choose the flow that matches your situation.

A) Create a new household (Household Owner)

Use this on the first device that will own and manage the household.

  1. Install BillPlex on your device.
  2. On the first screen, select “Create new household”.
  3. Set up your household members and (optionally) a monthly budget.

B) Join an existing household (Second person)

Use this on the device of the person who will share the same household data.

  1. Install BillPlex on the second device.
  2. On the first screen, select “Join existing household” (do not create a new one).
  3. Follow the on-screen instructions to pair with the Household Owner.
  4. The owner will confirm the request from the Household Sync screen.

C) Add more devices later

After the first connection, the Household Owner can add more devices to the same household.

  1. On the owner’s device: open Settings → Household Sync.
  2. Tap “Add new device”.
  3. On the new device: choose “Join existing household” and follow the pairing steps.

See Household Sync details

Household Sync

Keep multiple devices in sync for the same household — owner-controlled, local-first.

A) First-time setup between two devices

Use this flow when two people want to share the same household for the first time.

1) Steps for the Household Owner

  1. On the Household Owner’s device, open BillPlex → Settings → Household Sync.
  2. Tap “Add new device” to start pairing.

2) Steps for the second person (Join existing household)

  1. On the second person’s device, install BillPlex.
  2. On the first screen, select “Join existing household”.
  3. Follow the on-screen steps to detect the Household Owner’s device.
  4. Confirm the pairing on both devices when prompted.

B) Adding more devices to the same household

  1. At any time, the Household Owner can open Settings → Household Sync.
  2. Tap “Add new device” for each new device.
  3. On each new device, select “Join existing household” and complete pairing.

C) Syncing after initial setup

  1. To sync updates, open Settings → Household Sync on the Household Owner’s device and on the devices you want to update.
  2. On the Household Owner’s device, tap “Sync now” (or the equivalent sync action).
  3. Keep the Household Sync screen open on all devices until the sync completes.

D) Removing / unpairing a device

  1. On the Household Owner’s device, open Settings → Household Sync.
  2. Find the device you want to remove and choose “Remove / Unpair”.

Tips & clarifications

  • The Household Owner controls which devices are part of the household.
  • Make sure Bluetooth/Wi-Fi (or required nearby permissions) are enabled on all devices.
  • Only one Household Owner device should act as the main source when syncing.
  • If a device does not appear, reopen the Household Sync screen or restart the app.
  • All transfers are local; household data is not uploaded to our servers.

Import / Export

Manual backups you control.

Export a backup

  1. Open the Export option in the app and set a PIN (minimum 4 digits).
  2. An encrypted backup file is created. Save or share it via your preferred method.
  3. The backup stays under your control — no cloud account required.

Use a non-trivial PIN and store backups in a safe location.

Import a backup

  1. Open Import (from Startup or Settings) and select your backup file.
  2. Enter the same PIN you used during export.
  3. Choose whether to merge or replace local data (when available), then confirm.

If the PIN is incorrect, the import cannot continue. We cannot recover your PIN.

  • Backups are encrypted and offline unless you choose to share them.
  • Optionally test an import on a secondary device before relying on a backup.

Troubleshooting

Quick fixes for common issues.

I can’t see my latest expenses

  • Check active filters (month/year/category/member).
  • Close and reopen the app.
  • Verify that your device date/time is correct.

Import failed or PIN not accepted

  • Check that you selected the correct backup file.
  • Make sure you entered the exact PIN used during export.
  • Move the file to local storage and try again.

Household Sync / pairing did not work

  • Ensure Bluetooth/Wi-Fi and nearby permissions are enabled.
  • Confirm one device is acting as Household Owner and others use Join existing household.
  • Reopen the Household Sync screen or restart the app on both devices.

Frequently Asked Questions

How do I add an expense?

Open BillPlex → tap Add Expense → fill in amount, date, category, notes, member, and whether it is shared or personal → Save.

Where is my data stored?

Your expense data is stored locally on your device. You can optionally export an encrypted backup and move it manually between devices. See the Privacy Policy.

How do two people share one household?

One person creates the household and becomes the Household Owner. The second person installs BillPlex, chooses Join existing household, and pairs with the owner via Household Sync. Afterwards, the owner can add more devices if needed.

Is the app free?

BillPlex is free to download during launch. Core functionality will remain free; some advanced features may become optional in-app purchases.

Data & Privacy

BillPlex is built with privacy in mind. Your data stays on your devices, with optional encrypted backups and Household Sync fully controlled by you. Read the Privacy Policy.

Contact Support

We usually reply within 1–2 business days.

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