How to make an app for an RO purifier service

An RO service business lives on repeat visits: each purifier needs its filters changed every few months, and most customers forget when it was last done. An app that records every purifier with its last filter change and AMC visits gives you a daily list of who is due, which is work you would otherwise lose.

Updated 2026-11-09

Who uses the app

The owner and the technicians. If technicians close visits on their own phones, connect a Supabase database so the shop sees the filter changes they record. If one person takes calls and does visits, the data can stay on one phone.

The screens an RO purifier service app needs

• Due this week: Purifiers due for a filter change or AMC visit, by locality, with a WhatsApp button for each customer
• Customers: Search by name, phone or locality; each customer's purifiers and full service history
• Purifier record: Model, type, installed date, last filter set, last membrane and the next change due
• Complaints: Leakage, slow flow, bad taste, noise; the technician assigned and the visit date
• Visit card: Work done, filters and parts used with prices, TDS readings typed in before and after, and the bill
• AMC: Customers on a plan, visits and filter sets used, and when the plan renews
• Stock: Filter sets, membranes, pumps and valves in stock, going down as visits are closed

Features worth asking for

• Next filter change date worked out from the last change and the interval you set for each purifier
• A QR sticker for each purifier: the app shows a QR code to print, and scanning it in the installed app opens that purifier's record
• A reminder on your phone each morning at the time you set, showing the day's due visits (installed app)
• A WhatsApp message ready to send: 'Your purifier's filter change is due this month'
• Bill PDF after each visit with filters, parts, labour and AMC balance
• Pins on a map for customers in one locality, to group visits

Where the data lives

If one phone handles calls and visits, the data can stay on it. If technicians update visits from their own phones, connect your own Supabase database from the chat; add Razorpay if customers should pay for AMC online, with the money going to you.

How to make it with AppCub, step by step

1. Decide what the app does. List the screens you need, for example: Due this week, Customers, Purifier record, Complaints, Visit card.
2. Describe it to AppCub. Paste the request below, changed to your own business and details.
3. Check the plan. AppCub shows the screens and features it will build. Change them in the chat until they are right; seeing the plan is free.
4. Try it on your phone. The app runs live next to the chat. Scan the QR code to install it, and ask for changes.
5. Share it. Share it as a web link, an APK file, or publish it on Google Play from your own developer account.

Copy this request, change the details to match your RO purifier service, and paste it into AppCub:

Tips for an RO purifier service app

• Enter your existing AMC customers first, with the date of their last filter change; that alone gives you a due list.
• Set a different filter interval for areas with hard water if your technicians already know the difference.
• Print the QR stickers on paper that survives water and stick them on the side of the purifier, not near the tap.
• Keep TDS readings as plain numbers typed in by the technician; the app records them but doesn't judge the water.
• Test the scanning and the daily reminder on the installed app; both need the Android app, not the web preview.

What it costs

• Describing your app and seeing AppCub’s plan for it is free.
• A new app usually takes 60 to 110 credits. Start with the 2-day trial for ₹99 (150 credits, enough for one app and a few changes) or the one-time App Pack for ₹499. Starter is ₹1,599 a month for 700 credits.
• Google Play needs a paid plan (it includes the Play Store bundle and your app’s signing key) and your own Google Play developer account, a one-time US$25 fee to Google.
• Work that fails or is rolled back costs no credits.

See all plans

Good to know

• AppCub doesn't connect to purifiers or TDS meters, doesn't track technicians live and doesn't send SMS or WhatsApp messages by itself. Readings are typed in, and reminders to customers go out when someone taps the WhatsApp button.
• AppCub builds Android apps. You can also share the app as a web link that opens on any phone; for the iPhone App Store, AppCub’s team can do it for you.

Questions

Can the app tell me when each customer's filters are due?

Yes. Ask for a filter interval per purifier, and the app works out the next due date from the last change and lists everyone due this week.

Can technicians scan a sticker on the purifier to open its history?

Yes. The app can show a QR code for each purifier to print as a sticker, and the installed Android app scans it with the phone camera to open that record.

Can the app read TDS from my meter?

No. AppCub doesn't connect to meters or purifiers. The technician types the reading, and it is saved on the visit card.

Will customers get reminder messages automatically?

No. The app gives you a list and a WhatsApp button with the message ready; someone taps send. The installed app can remind you on your own phone at a set time.

Can one customer have two purifiers, at home and in the shop?

Yes. Ask for several purifiers under one customer, each with its own address, filter dates and history.

Can the app keep count of filter sets used on AMC?

Yes. Ask for each AMC to show the visits and filter sets included, how many are used, and the renewal date.

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