Pretext vs CellMeasurer: Measuring Chat Bubbles

📰 Dev.to · Ikhlak

Learn to measure chat bubbles accurately in chat UIs using Pretext and CellMeasurer, and why it matters for smooth user experience

intermediate Published 5 Apr 2026
Action Steps
  1. Build a chat UI with virtualization using VariableSizeList
  2. Configure Pretext to measure chat bubbles
  3. Compare the performance of Pretext and CellMeasurer
  4. Apply the optimal measurement solution to your chat app
  5. Test the chat UI for smooth scrolling and rendering
Who Needs to Know This

UI/UX designers and software engineers building chat applications can benefit from this knowledge to improve their app's performance and user experience

Key Insight

💡 Pretext and CellMeasurer are two different approaches to measuring chat bubbles in virtualized chat UIs, with distinct performance characteristics

Share This
📱💬 Improve your chat app's performance with accurate chat bubble measurement using Pretext or CellMeasurer!

Full Article

If you've ever built a chat UI with virtualization, you've hit the same wall: VariableSizeList needs...
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