HOW TO USE
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    Compare the Schemas of Two ArcGIS Layers

    Diff the field schemas of two ArcGIS layers side by side — added, removed and changed fields, type/length/domain drift. The schema compare ArcGIS Online doesn't have (Pro-only otherwise).

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    Connected to ArcGIS Online
    1
    ArcGIS Online — Content tab: Go to arcgis.com → Content, click your Feature Layer item → scroll the right panel down → copy the URL ending in /FeatureServer/0
    2
    ArcGIS Online — Map Viewer: Open your web map → click a layer in the layers panel → ⋯ More options → View item details → Item page → URL in bottom-right.
    3
    Organizational AGOL: Works with personal arcgis.com accounts and organizational portals (yourorg.maps.arcgis.com). URL format: https://services.arcgis.com/{orgId}/arcgis/rest/services/{name}/FeatureServer/0
    4
    Not sure which layer? Use the free REST Explorer → — paste your org URL and browse all your Feature Services visually.
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