Custom calculator app development for quotes, plans and products.
A calculator or configurator app turns the rules behind a quote, a plan or a product setup into a few clear taps, so customers or your sales team get the right answer without a spreadsheet. We build them for businesses whose pricing or product logic is too specific for a generic form. You get a written scope and quote first, and the calculator app cost guide explains what usually drives it.
Built for
- Trades and installers quoting jobs on site
- Manufacturers with configurable products
- Sales teams who quote from a complex price sheet
- Consultants and planners with a repeatable calculation
- Specialist professionals who need a field calculator
- Pricing
- Written quote after scope
- Platforms
- iOS and Android
- Logic
- Your rules, tested against your examples
- You own
- Files and original assets
An installer prices a fence on site
- 1The installer enters the fence length, height and the number of gates.
- 2They pick a material and finish; options that do not fit the chosen height are hidden.
- 3The app applies your price rules, including minimum charges and extras, and shows the total.
- 4The installer adjusts one option with the customer and the total updates straight away.
- 5A branded summary is sent to the customer by email and saved to the office record.
What a sensible first version includes
- Input screens. The questions in a clear order, with units and validation.
- Rules engine. Your pricing or calculation logic, tested against real examples you provide.
- Options and dependencies. Options that show, hide or change based on earlier choices.
- Result screen. Total, breakdown and any notes or assumptions.
- Saved quotes. Save, reopen and duplicate past calculations.
- Share or export. PDF or email summary for the customer.
Integrations
- Price list updates
- Prices edited in an admin or imported from a spreadsheet so you do not need a developer for changes.
- CRM
- Send a finished quote to your CRM as a lead or deal; depends on its API.
- PDF generation
- Branded quote PDFs generated on the phone or on the server.
- Product data
- Pulling options from an existing product system is scoped per system.
Costs after launch
- Hosting, if quotes or prices are stored on a server; none for a fully on-device calculator
- Apple Developer Program, 99 USD a year, and a Google Play developer account, 25 USD once (both in your name)
- Third-party subscriptions such as a CRM or PDF service
- Maintenance for OS updates and rule changes, agreed separately
What changes the quote
Every app gets a written scope with assumptions before any price.
- Rule complexity
- Dependencies, minimums and exceptions take the most time to build and test.
- Who updates prices
- An admin for price changes costs more than fixed rules in the code.
- Output
- A total on screen is quick; branded PDFs and saved history add work.
- Integrations
- Sending quotes to a CRM or pulling product data adds build and test time.
- Visual configurators
- Showing the product change as options change adds design and asset work.
When to buy existing software instead
If your calculation fits in a spreadsheet that one person uses, or a form builder with formula fields can show the result, keep that. A custom app pays off when many people quote with the same rules, the logic has dependencies a form cannot handle, or customers should use it themselves. The calculator web vs app guide covers when a web page is enough.
What you own
After full payment, you receive the project files and the original assets created for your app. Third-party services, SDKs, fonts and licensed assets remain subject to their own license terms, and accounts like your developer, hosting and payment accounts stay in your name.
Before you commission: calculators and configurators
- Guide · 4 minCustom calculator app development cost and scopeCustom calculator app development cost depends on rules, data and what happens to the result. See a quoting workflow and when a generic calculator is enough.Read more
- Guide · 4 minWeb calculator vs native app: which suits your customers?Web calculator vs native app compared on distribution, offline use, updates and accounts, with a clear rule for when customers need an app and staff do.Read more
- Guide · 5 minPricing configurator app development: from spreadsheet to appPricing configurator app development starts with the spreadsheet. Document formula ownership, rounding, validation and edge cases, with a test-case table.Read more
More app guides: Mobile app development cost · Code and art ownership · App brief template
Calculators and configurators: FAQ
Can we change prices without a developer?
Yes, if we scope a price admin or a spreadsheet import; fixed rules in the code are cheaper but need a developer to change.
How do you make sure the maths is right?
You give us worked examples with the expected results, and we test the app's results against them before delivery.
Should it be an app or a web page?
A web page is often enough for customers; an app makes more sense for staff in the field or when the calculator needs to work offline.
What should my brief include?
Your inputs, rules, a few worked examples and what the result should look like; the pricing configurator brief gives a template.
How do I get a quote?
Send the brief or the full questionnaire through the app quote form and you receive a written scope and quote.
Other apps we build
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Tell us the workflow. Get a written scope.
About four minutes. Assumptions, timeline and quote come back in writing.