diff --git a/app/src/components/inventory/FieldSchemaEditor.js b/app/src/components/inventory/FieldSchemaEditor.js
index 2c9860a0..30becf0a 100644
--- a/app/src/components/inventory/FieldSchemaEditor.js
+++ b/app/src/components/inventory/FieldSchemaEditor.js
@@ -1,5 +1,7 @@
 import React, {useState} from "react";
-import {Input, Select, TableBody, TableCell, TableHeader, TableHeaderCell, TableRow} from "semantic-ui-react";
+import {
+    Checkbox, Input, Select, TableBody, TableCell, TableHeader, TableHeaderCell, TableRow
+} from "semantic-ui-react";
 import {Button, Icon, Modal, Table} from "../Theme";
 import {ALL_UNITS} from "./units";
 
@@ -61,9 +63,13 @@ export function FieldSchemaEditor({fields, open, onClose, onSave}) {
                 <TableHeader>
                     <TableRow>
                         <TableHeaderCell width={2}>Order</TableHeaderCell>
-                        <TableHeaderCell width={4}>Label</TableHeaderCell>
-                        <TableHeaderCell width={4}>Type</TableHeaderCell>
+                        <TableHeaderCell width={3}>Label</TableHeaderCell>
+                        <TableHeaderCell width={3}>Type</TableHeaderCell>
                         <TableHeaderCell width={5}>Unit / Options</TableHeaderCell>
+                        <TableHeaderCell width={2} textAlign='center'
+                                         title='Show this field in the read-only portrait-mobile view'>
+                            Mobile
+                        </TableHeaderCell>
                         <TableHeaderCell width={1}/>
                     </TableRow>
                 </TableHeader>
@@ -96,6 +102,10 @@ export function FieldSchemaEditor({fields, open, onClose, onSave}) {
                                            options: e.target.value.split(',').map(s => s.trim()).filter(Boolean)
                                        })}/>}
                         </TableCell>
+                        <TableCell collapsing textAlign='center'>
+                            <Checkbox toggle checked={!!f.mobile} aria-label={`Show ${f.label || f.key} on mobile`}
+                                      onChange={(e, data) => update(index, {mobile: data.checked})}/>
+                        </TableCell>
                         <TableCell collapsing>
                             <Button color='red' icon size='mini' onClick={() => remove(index)}
                                     aria-label='Remove field'><Icon name='trash'/></Button>
diff --git a/app/src/components/inventory/InventoryItemsMobile.js b/app/src/components/inventory/InventoryItemsMobile.js
new file mode 100644
index 00000000..165fbde6
--- /dev/null
+++ b/app/src/components/inventory/InventoryItemsMobile.js
@@ -0,0 +1,61 @@
+import React from "react";
+import {TableBody, TableCell, TableHeader, TableHeaderCell, TableRow} from "semantic-ui-react";
+import {Icon, Table} from "../Theme";
+import {formatValue, isItemExpired} from "./InventoryTable";
+
+// Fallback columns for inventories whose schema predates the per-field `mobile` flag: these preferred keys in
+// order, else the first few fields.
+const FALLBACK_COLUMN_KEYS = ['name', 'subcategory', 'item_size', 'count'];
+
+// The condensed columns for portrait mobile: fields the user flagged `mobile`, falling back to a sensible default
+// when an older schema has none flagged.
+export function mobileColumns(fields) {
+    const ordered = [...(fields || [])].sort((a, b) => (a.order ?? 0) - (b.order ?? 0));
+    const flagged = ordered.filter(f => f.mobile);
+    if (flagged.length) {
+        return flagged;
+    }
+    const preferred = ordered.filter(f => FALLBACK_COLUMN_KEYS.includes(f.key));
+    if (preferred.length >= 4) {
+        return preferred;
+    }
+    // Fewer than 4 preferred keys (e.g. old tool/fuel schemas) — show the first four fields instead.
+    return ordered.slice(0, 4);
+}
+
+/**
+ * Read-only, condensed inventory view for portrait mobile.  Shows only the fields flagged `mobile` (configurable in
+ * the field-schema editor) and highlights expired rows; editing/sorting/adding happen in the full InventoryTable
+ * (landscape / tablet+).
+ */
+export function InventoryItemsMobile({fields, items}) {
+    const columns = mobileColumns(fields);
+
+    return <>
+        <p style={{opacity: 0.7, fontSize: '0.85em', marginBottom: '0.5em'}}>
+            Read-only — rotate to landscape to edit.
+        </p>
+        {(items || []).length === 0
+            ? <p>No items yet.</p>
+            : <Table celled unstackable>
+                <TableHeader>
+                    <TableRow>
+                        {columns.map(f => <TableHeaderCell key={f.key}>{f.label}</TableHeaderCell>)}
+                    </TableRow>
+                </TableHeader>
+                <TableBody>
+                    {items.map(item => {
+                        const expired = isItemExpired(item, fields);
+                        return <TableRow key={item.id} negative={expired}>
+                            {columns.map((f, idx) => <TableCell key={f.key}>
+                                {idx === 0 && expired &&
+                                    <Icon name='warning sign' color='red' title='Expired'
+                                          style={{marginRight: '0.4em'}}/>}
+                                {formatValue(item, f)}
+                            </TableCell>)}
+                        </TableRow>;
+                    })}
+                </TableBody>
+            </Table>}
+    </>;
+}
diff --git a/app/src/components/inventory/InventoryItemsMobile.test.js b/app/src/components/inventory/InventoryItemsMobile.test.js
new file mode 100644
index 00000000..9d644674
--- /dev/null
+++ b/app/src/components/inventory/InventoryItemsMobile.test.js
@@ -0,0 +1,72 @@
+import React from "react";
+import {render, screen} from "@testing-library/react";
+import {InventoryItemsMobile} from "./InventoryItemsMobile";
+
+const FIELDS = [
+    {key: 'name', label: 'Name', type: 'text', order: 0},
+    {key: 'category', label: 'Category', type: 'text', order: 1},
+    {key: 'subcategory', label: 'Sub-category', type: 'text', order: 2},
+    {key: 'item_size', label: 'Size', type: 'quantity', unit: 'lb', order: 3},
+    {key: 'count', label: 'Count', type: 'number', order: 4},
+    {key: 'expiration_date', label: 'Expires', type: 'date', order: 5},
+];
+
+describe('InventoryItemsMobile', () => {
+    test('shows the fields flagged `mobile`, in field order', () => {
+        const flagged = [
+            {key: 'name', label: 'Name', type: 'text', order: 0, mobile: true},
+            {key: 'category', label: 'Category', type: 'text', order: 1},
+            {key: 'count', label: 'Count', type: 'number', order: 2, mobile: true},
+            {key: 'expiration_date', label: 'Expires', type: 'date', order: 3, mobile: true},
+        ];
+        render(<InventoryItemsMobile fields={flagged} items={[{id: 1, name: 'Rice'}]}/>);
+
+        const headers = [...document.querySelectorAll('thead th')].map(th => th.textContent);
+        expect(headers).toEqual(['Name', 'Count', 'Expires']);
+        // An unflagged field is not shown.
+        expect(screen.queryByText('Category')).toBeNull();
+    });
+
+    test('falls back to default columns when no field is flagged mobile', () => {
+        render(<InventoryItemsMobile fields={FIELDS} items={[{id: 1, name: 'Rice'}]}/>);
+
+        const headers = [...document.querySelectorAll('thead th')].map(th => th.textContent);
+        expect(headers).toEqual(['Name', 'Sub-category', 'Size', 'Count']);
+        expect(screen.queryByText('Category')).toBeNull();
+        expect(screen.queryByText('Expires')).toBeNull();
+    });
+
+    test('falls back to the first four fields when no preferred keys are present', () => {
+        const fields = [
+            {key: 'fuel_type', label: 'Fuel', type: 'text', order: 0},
+            {key: 'container', label: 'Container', type: 'text', order: 1},
+            {key: 'volume', label: 'Volume', type: 'quantity', order: 2},
+            {key: 'purchase_date', label: 'Purchased', type: 'date', order: 3},
+            {key: 'location', label: 'Location', type: 'location', order: 4},
+        ];
+        render(<InventoryItemsMobile fields={fields} items={[{id: 1, fuel_type: 'Diesel'}]}/>);
+        const headers = [...document.querySelectorAll('thead th')].map(th => th.textContent);
+        expect(headers).toEqual(['Fuel', 'Container', 'Volume', 'Purchased']);
+    });
+
+    test('renders quantity values with their unit and flags expired rows', () => {
+        const items = [
+            {id: 1, name: 'Old', subcategory: 'rice', item_size: '5', item_size_unit: 'lb', count: '2',
+             expiration_date: '2000-01-01'},
+            {id: 2, name: 'Fresh', subcategory: 'beans', item_size: '10', item_size_unit: 'lb', count: '4',
+             expiration_date: '2999-01-01'},
+        ];
+        const {container} = render(<InventoryItemsMobile fields={FIELDS} items={items}/>);
+
+        expect(screen.getByText('5 lb')).toBeTruthy();
+        const rowOf = (name) => screen.getByText(name).closest('tr');
+        expect(rowOf('Old').className).toContain('negative');
+        expect(rowOf('Fresh').className).not.toContain('negative');
+        expect(container.querySelectorAll('i.warning.sign.icon').length).toBe(1);
+    });
+
+    test('shows an empty state when there are no items', () => {
+        render(<InventoryItemsMobile fields={FIELDS} items={[]}/>);
+        expect(screen.getByText('No items yet.')).toBeTruthy();
+    });
+});
diff --git a/app/src/components/inventory/InventoryRoute.js b/app/src/components/inventory/InventoryRoute.js
index 833e6cbc..bd57cf22 100644
--- a/app/src/components/inventory/InventoryRoute.js
+++ b/app/src/components/inventory/InventoryRoute.js
@@ -4,9 +4,11 @@ import {Button, Confirm, Header, Icon, Loader, Menu, Modal, Segment} from "../Th
 import {PageContainer, useTitle} from "../Common";
 import {collectLocations, useCatalog, useInventories} from "../../hooks/customHooks";
 import {InventoryTable} from "./InventoryTable";
+import {InventoryItemsMobile} from "./InventoryItemsMobile";
 import {InventorySummary} from "./InventorySummary";
 import {FieldSchemaEditor} from "./FieldSchemaEditor";
 import {CatalogEditor} from "./CatalogEditor";
+import {Media} from "../../contexts/contexts";
 
 const INVENTORY_TYPES = [
     {key: 'food', value: 'food', text: 'Food Storage'},
@@ -140,8 +142,17 @@ export function InventoryRoute() {
             </Menu>
 
             {tab === 'items'
-                ? <InventoryTable slug={slug} fields={fields} items={items} locations={locations} catalog={catalog}
-                                  onChange={newItems => persistInventory(slug, {items: newItems})}/>
+                ? <>
+                    {/* Portrait mobile: condensed, read-only.  Rotate to landscape (tablet+) for the full editor. */}
+                    <Media at='mobile'>
+                        <InventoryItemsMobile fields={fields} items={items}/>
+                    </Media>
+                    <Media greaterThanOrEqual='tablet'>
+                        <InventoryTable slug={slug} fields={fields} items={items} locations={locations}
+                                        catalog={catalog}
+                                        onChange={newItems => persistInventory(slug, {items: newItems})}/>
+                    </Media>
+                </>
                 : <InventorySummary fields={fields} items={items}/>}
 
             <FieldSchemaEditor fields={fields} open={editFieldsOpen}
diff --git a/app/src/components/inventory/InventoryTable.js b/app/src/components/inventory/InventoryTable.js
index 3d25179f..f5cd983c 100644
--- a/app/src/components/inventory/InventoryTable.js
+++ b/app/src/components/inventory/InventoryTable.js
@@ -98,17 +98,8 @@ export function InventoryTable({slug, fields, items, locations, catalog, onChang
         setSort(null);
     }, [slug, fields]);
 
-    // Expired = any date-type field strictly before the start of today.
-    const dateFields = useMemo(() => fields.filter(f => f.type === 'date'), [fields]);
-    const todayStart = useMemo(() => {
-        const d = new Date();
-        d.setHours(0, 0, 0, 0);
-        return d.getTime();
-    }, []);
-    const isExpired = (item) => dateFields.some(f => {
-        const t = Date.parse(item[f.key]);
-        return !isNaN(t) && t < todayStart;
-    });
+    // Expired = any date-type field strictly before the start of today (shared with the mobile view).
+    const isExpired = (item) => isItemExpired(item, fields);
 
     const toggleSort = (key) => setSort(prev =>
         prev && prev.key === key
@@ -273,7 +264,8 @@ export function InventoryTable({slug, fields, items, locations, catalog, onChang
     </>;
 }
 
-function formatValue(item, field) {
+// Format an item's value for a field for display (shared with the read-only mobile view).
+export function formatValue(item, field) {
     const value = item[field.key];
     if (value === '' || value == null) {
         return '';
@@ -284,3 +276,16 @@ function formatValue(item, field) {
     }
     return String(value);
 }
+
+// True when any `date`-type field is before the start of today (item is expired).
+export function isItemExpired(item, fields) {
+    const start = new Date();
+    start.setHours(0, 0, 0, 0);
+    return (fields || []).some(f => {
+        if (f.type !== 'date') {
+            return false;
+        }
+        const t = Date.parse(item[f.key]);
+        return !isNaN(t) && t < start.getTime();
+    });
+}
diff --git a/modules/inventory/defaults.py b/modules/inventory/defaults.py
index 5ece650f..da75f6da 100644
--- a/modules/inventory/defaults.py
+++ b/modules/inventory/defaults.py
@@ -57,34 +57,36 @@ DEFAULT_FOOD_CATEGORIES = [
 _FOOD_CATEGORY_OPTIONS = sorted({category for _, category in DEFAULT_FOOD_CATEGORIES})
 
 DEFAULT_FIELD_SETS = {
+    # `mobile=True` marks the columns shown in the condensed, read-only portrait-mobile view; the user can change
+    # which fields are mobile in the field-schema editor.
     'food': [
         _field('brand', 'Brand', 'text', 0),
-        _field('name', 'Name', 'text', 1, required=True),
+        _field('name', 'Name', 'text', 1, required=True, mobile=True),
         _field('category', 'Category', 'select', 2, options=_FOOD_CATEGORY_OPTIONS),
-        _field('subcategory', 'Subcategory', 'text', 3),
-        _field('item_size', 'Size', 'quantity', 4, unit='lb'),
-        _field('count', 'Count', 'number', 5),
+        _field('subcategory', 'Subcategory', 'text', 3, mobile=True),
+        _field('item_size', 'Size', 'quantity', 4, unit='lb', mobile=True),
+        _field('count', 'Count', 'number', 5, mobile=True),
         _field('calories', 'kcal per unit', 'calories', 6),
         _field('expiration_date', 'Expires', 'date', 7),
     ],
     'fuel': [
-        _field('name', 'Name', 'text', 0, required=True),
+        _field('name', 'Name', 'text', 0, required=True, mobile=True),
         _field('fuel_type', 'Fuel Type', 'select', 1,
-               options=['gasoline', 'diesel', 'propane', 'kerosene', 'oil']),
+               options=['gasoline', 'diesel', 'propane', 'kerosene', 'oil'], mobile=True),
         _field('container', 'Container', 'text', 2),
-        _field('item_size', 'Size', 'quantity', 3, unit='gallon'),
-        _field('count', 'Count', 'number', 4),
+        _field('item_size', 'Size', 'quantity', 3, unit='gallon', mobile=True),
+        _field('count', 'Count', 'number', 4, mobile=True),
         _field('purchase_date', 'Purchased', 'date', 5),
         _field('location', 'Location', 'location', 6),
     ],
     'tool': [
-        _field('name', 'Name', 'text', 0, required=True),
+        _field('name', 'Name', 'text', 0, required=True, mobile=True),
         _field('brand', 'Brand', 'text', 1),
         _field('category', 'Category', 'select', 2,
-               options=['hand', 'power', 'garden', 'automotive', 'measuring', 'safety']),
-        _field('count', 'Count', 'number', 3),
+               options=['hand', 'power', 'garden', 'automotive', 'measuring', 'safety'], mobile=True),
+        _field('count', 'Count', 'number', 3, mobile=True),
         _field('condition', 'Condition', 'select', 4, options=['new', 'good', 'worn', 'broken']),
-        _field('location', 'Location', 'location', 5),
+        _field('location', 'Location', 'location', 5, mobile=True),
         _field('notes', 'Notes', 'text', 6),
     ],
 }