Duo app icon

Apps Like Duo for iPhone and iPad

Test responsive web design views simultaneously.

The app displays a desktop and mobile view simultaneously for responsive web design testing. Users can navigate both panes with synchronized browsing and access WebKit Dev Tools for debugging.

by Electric Pulp★ 0.00 ratingsDeveloper Tools$4.99Data updated 2026-10-25
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Ranked alternatives

Showing 321–340 of 1,000 ranked alternatives.

  2. BrickGL app icon

    BrickGL

    Jamal Eason

    ★ 0.00 ratingsGraphics & Design$0.99Data updated 2026-11-12
    App details
  3. 1Extn - Extensions & Shortcuts app icon

    1Extn - Extensions & Shortcuts

    Charles Kautsire

    Enable with a tap

    Enable and disable Safari with taps in device settings. Use Picture-in-Picture for videos. Translate webpages to different languages. Try one at a time for customization.

    ★ 4.616 ratingsUtilities$1.99Data updated 2026-09-06
    App details
  5. FL Chart app icon

    FL Chart

    Iman Khoshabi

    Visualize data with charts and graphs

    Demonstrates data visualization with interactive examples for Line, Bar, Pie, Scatter, and Radar charts. Users can customize colors, adjust styles, and explore configurations. Charts are built using , an open-source Flutter library.

    ★ 5.01 ratingsDeveloper ToolsFreeData updated 2026-09-06
    App details
  6. Hype 4 app icon

    Hype 4

    Tumult Inc.

    ★ 0.00 ratingsGraphics & DesignFreeData updated 2026-09-17
    App details
  12. SwordSoft Layout app icon

    SwordSoft Layout

    Cheyuan Chen

    Create, preview, and manage mockups.

    The app allows users to create, preview, and manage mockups for websites, mobile applications, or desktop applications. It offers a clean interface with unlimited page size and multi-page document support.

    ★ 0.00 ratingsGraphics & Design$6.99Data updated 2026-09-19
    App details
  15. Sitely, AI Website Builder app icon

    Sitely, AI Website Builder

    Crinon SRL

    Build websites visually on iPad.

    The app offers a visual website builder for iPad and Mac. Users design pages by dragging real elements into place without writing code or using templates.

    ★ 0.00 ratingsGraphics & DesignFreeData updated 2026-11-01
    App details

How we rank alternatives

Apps are ranked by functional similarity, category fit, rating confidence, and popularity.