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Maji Systems

The app

The till, toolkit and ledger for a water point.

A free Android app for the people who run Maji dispensers. Resellers use it to top up WaterCards, engineers to set up dispensers, and managers to see what every tap has sold. Card top-ups work with no signal at all.

Download the APKHow to install

v1.36 · Android 7.0+ · NFC required · ≈35 MB · free

The Maji Systems app home screen, showing a large NFC symbol under the heading “Tap Your Card” and the current community, Tetekwao, below it
A WaterCard just read by the app, showing its card ID and a zero balance above quick-add buttons from ₵1 to ₵50, an amount field, and options to register the card or view pending top-ups

Who uses it

Three jobs, one app.

What you see depends on your role in the community. Resellers get a till, engineers get a toolkit, managers get the overview. Nobody has to wade through screens meant for someone else.

Resellers

Sell water credit to customers, from a float the manager approves.

  • Tap a WaterCard to see its balance and the registered customer
  • Top up a card for cash against your own float, with or without signal
  • Request more float, and track whether it has been approved
  • Refund a pending top-up that hasn’t reached a dispenser yet

Engineers

Commission and configure dispensers on site, without a laptop.

  • Add a dispenser by scanning its QR code or typing its device ID
  • Write pricing, calibration and power settings to an Engineer Card
  • Tap the Engineer Card on the dispenser to apply them
  • Read back live status: battery and solar voltage, price per litre

Managers

Run a community: its dispensers, its team and its money.

  • See dispensers, members, credit requests and card sales at a glance
  • Approve or decline resellers’ requests for float
  • Invite people by mobile number and set their role
  • Review each dispenser’s sales and maintenance reports
  • Get a warning when the price on a dispenser no longer matches the price on record

Screenshots

Inside the app.

The management overview for the Sabinyi-Tukumu community, with tiles counting 14 dispensers, 17 users, 92 credit requests and 474 cards, and a button to add a dispenser
A community at a glance
A list of the dispensers in a community, named Tap 1a through Tap 4a, each row opening that dispenser’s own screen
Every dispenser in the community
Today’s transactions for the dispenser Tap 7b, listing the time, card ID and litres drawn for each, with the tariff and an offline badge shown above
Sales per dispenser, by time period
Maintenance reports for a dispenser, each timestamped card showing battery voltage, power voltage, mean pressure and price per litre
Maintenance reports: battery, power, pressure, tariff
The dispenser settings screen for Tap 7b, with fields for price per litre, flow rate calibration and dispenser name above a save button
Dispenser settings, changed from the phone

For engineers

A dispenser’s settings, carried on a card.

Dispensers are configured with the red Engineer Card rather than over the air, so a technician at a water point with no signal can still change what needs changing. The app writes the settings onto the card, and one tap applies them to the unit and reads its status back.

A red Maji Systems Engineer Card, used to configure a dispenser from the app
Pricing
  • Price per litre
  • Currency symbol, from a built-in list
Calibration
  • Flow meter calibration
  • Pressure calibration and offset
Power
  • Card reader poll rate
  • Board sleep and wake times
  • Modem sleep interval
Data
  • Modem mode: always on, power saving or off
  • Manual APN name, username and password
Advanced
  • Settings version
  • Safe mode
  • Maintenance screen change interval

Download

Installing the app.

The app is downloaded directly rather than from the Play Store, so the first install takes one extra step. Android walks you through it.
  1. 1

    Download the APK

    Open this page on the Android phone you want to use and tap the download button. Chrome will warn that this type of file can harm your device. It shows that warning for every app downloaded outside the Play Store. Choose to keep the file.

  2. 2

    Allow installs from your browser

    Open the downloaded file. Android will ask whether to allow installs from the app you opened it with, usually Chrome or Files. Allow it, go back, and install.

  3. 3

    Log in with your mobile number

    Open the app and enter your mobile number. A code arrives by SMS, so there is no password to remember. If nobody has invited you to a community yet, ask your manager to add you.

  4. 4

    Let it update itself

    Once installed, the app checks for new versions and updates in place. You only need this page again for a new phone.

Maji Systems App

v1.36 · ≈35 MB

Download the APK

Downloads from releases.maji.systems. Open this page on the phone you’re installing on.

Requirements

Operating system
Android 7.0 or newer (API 24+)
NFC
Required. The phone reads and writes WaterCards directly
Camera
Used to scan a dispenser’s QR code when commissioning it
Connectivity
Needed to log in and to sync. Card top-ups work offline
Download size
≈35 MB APK
Distribution
Direct APK download, not on Google Play
Package name
com.majisystems.majiapp
Price
Free for Maji Systems operators and their teams

Questions

Common questions.

Stuck on an install, or need an account? Ask us.

Is the app on the Google Play Store?

No. It is a direct download from this page, which is why the first install needs the extra permission described above. After that the app keeps itself up to date without a store.

Does it work without a mobile network?

Mostly. Reading a card and topping it up work fully offline, because the balance is written onto the card itself. Logging in and syncing need a connection, so the app stores activity on the phone and sends it when there is signal again.

Do I need an NFC phone?

Yes. The app reads and writes MIFARE DESFire cards over NFC, so a phone without NFC can’t read a WaterCard or an Engineer Card. Most Android phones sold in the last several years have it.

What is an Engineer Card, and who gets one?

A red card for technicians, never given to customers. The app writes dispenser settings onto it (price per litre, calibration, power saving, modem configuration), and tapping it on a dispenser applies them and reads live status back.

How do resellers get credit to sell?

A reseller requests a float in the app, and a manager in the same community approves or declines it. Approved credit is added to the reseller’s balance, which goes down as they top up customers’ cards. Both sides can see the request history.

Can I use one phone for more than one community?

Yes. If your account belongs to several communities, you choose which one you’re working in, and the balances, dispensers and team you see follow that choice.

How do I log in?

With your mobile number. The app sends a one-time code by SMS, so there is no password to forget or write down. A manager has to invite your number to a community first.

Something has gone wrong. How do I report it?

Use the Report a Problem screen in the app. Describe what happened and it sends us the app logs and local database. It tells you how much mobile data that will use before it sends anything.

The app is half of it.

The other half is the dispenser at the water point: solar powered, works offline, and reads the same WaterCards.

See the dispenserGet in touch