Use Line item properties, fully creating such an UI is an advanced theme customization without a monthly app fee.
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Topic summary
A user seeks to implement a custom size input feature on their Shopify product page, allowing customers to enter personalized measurements (similar to functionality shown in a shared video).
Proposed Solutions:
• Third-party apps — Multiple responders recommend product customization apps:
- Easify Product Options: Offers dimension fields with conditional logic (shows custom inputs only when “Customized” size is selected). Includes measurement unit toggles (cm/m) and optional popup guides. Conditional logic available on free plan; dimension fields require paid plan (currently discounted for BFCM).
- Inkybay Product Personalizer: Supports preset sizes plus custom measurement inputs, dynamic pricing, and 21-day free trial.
- Other suggestions: Product Customizer, Product Personalizer, Products Designer.
• Custom development — Using Shopify’s Line Item Properties via Liquid code to create custom input fields without monthly app fees. This approach requires advanced theme customization skills and doesn’t create true variants or enable dynamic pricing/inventory control.
Status: Discussion remains open with the user inquiring about free plan availability. Multiple vendors offering implementation assistance.