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 361–380 of 1,000 ranked alternatives.

  2. API Zen app icon

    API Zen

    Jaseem Valiya Valappil

    ★ 0.00 ratingsDeveloper ToolsFreeData updated 2026-09-06
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  3. Cooler app icon

    Cooler

    Moshe Berman

    Color utility for iOS OS X

    The app generates UIColor or NSColor code from hex values or a color picker. Users can import colors from images, Photoshop, or the web into their codebase.

    ★ 0.00 ratingsDeveloper ToolsFreeData updated 2026-10-17
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  5. Blena app icon

    Blena

    Oneworld Equipment Corp

    ★ 5.01 ratingsUtilitiesFreeData updated 2026-09-06
    App details
  8. Termly app icon

    Termly

    Siarhei Pratasavitski

    ★ 0.00 ratingsDeveloper ToolsFreeData updated 2026-09-06
    App details
  11. Ed - Game Tile Editor app icon

    Ed - Game Tile Editor

    Chilling Moose OU

    Edit sprites, design levels, export brushes

    Create -based prototypes and level designs. Import sprite sheets and split them into individual sprites. Set terrain bit mask rules and generate brushes for terrain drawing. Define TileDefs with custom sizes, animations, and colors.

    ★ 4.52 ratingsGraphics & Design$14.99Data updated 2026-09-06
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  12. DeskOS app icon

    DeskOS

    Mazen Al-Ashbi

    ★ 5.04 ratingsProductivity$11.99Data updated 2026-11-12
    App details

How we rank alternatives

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