Last night at midnight I received a request from a long-time client to develop a car rental monthly-rent calculator, which is essentially the same calculation logic as for mobile phones. I implemented a version and found the most tedious part was image retouching—various AI image editors—but in fact the most efficient tool is still Windows Paint.
Key Features
- Simply enter the total vehicle price, and the tool automatically calculates the down payment, monthly rent, and total rent. Upon opening the page, the cursor automatically focuses on the price input field for immediate entry.
- Preset and custom down payment: Offers three preset down payment options (30%, 40%, 50%) and supports custom down payment amounts; when customizing, the corresponding down payment percentage is displayed.
- Multiple installment plans: Supports three term options—6, 9, and 12 months—automatically selecting the corresponding multiplier and additional fees for calculation.
- Smart multiplier and surcharge rules
- Real-time billing details: Displays the down payment and each installment bill (including dates), along with the total number of installments and remaining installments, making it easy for users to track their repayment schedule.
- No local caching: The input fields remain empty each time the page is opened, ensuring privacy and operational consistency.
- Visual details: Includes a simple carousel and responsive layout for a mobile-friendly experience.
The current version is a mobile H5 webpage, not a WeChat mini-program. This is mainly because WeChat mini-programs often ban accounts indiscriminately, making them prone to being unfairly targeted. A webpage version is much safer.
Interface preview
As shown below:
If only AI could automatically handle customer requirements—development itself doesn’t actually take much time. Most of the time is spent communicating with customers, discussing requirements, and organizing them. That’s why variations of OpenClaw are highly relevant in such scenarios.
About the Author 🌱
I am a developer from Yantai, Shandong, China. If you have any interesting topics or software development needs, feel free to email me at: zhongwei.sun2008@gmail.com for a chat, or follow my personal public account "Elephant Tools", See more contact information