diff --git a/README.md b/README.md
index 9977a04..429eb05 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,7 @@ Datacenter Modeler is a React-based web application for designing datacenter rac
 - Export a PDF report with the diagram and rack inventory
 - Dark/light theme selector
 - Material UI-based interface
+- Welcome dialog with an optional Cash App donation link
 
 ## Component Library
 
@@ -170,3 +171,4 @@ Each rack/cabinet contains its own metadata and an array of installed equipment.
 - JSON export is the portable save format for moving diagrams between browsers or computers.
 - PDF and image exports are generated from the rendered workspace.
 - The current implementation is client-side only; no backend server or database is required.
+- Donations are optional and use the Cash App link for `$MatthewPuckett`.
diff --git a/src/App.tsx b/src/App.tsx
index 937b939..d77016a 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -42,6 +42,7 @@ import {
   Image,
   Inventory2,
   LightMode,
+  OpenInNew,
   PictureAsPdf,
   Power,
   Router,
@@ -50,6 +51,7 @@ import {
   SettingsInputComponent,
   Storage,
   Terminal,
+  VolunteerActivism,
   ViewColumn,
 } from '@mui/icons-material';
 import html2canvas from 'html2canvas';
@@ -147,6 +149,8 @@ export default function App() {
   const [exportAnchor, setExportAnchor] = useState<HTMLElement | null>(null);
   const [pendingContainer, setPendingContainer] = useState<'rack' | 'cabinet' | null>(null);
   const [pendingSize, setPendingSize] = useState(42);
+  const [welcomeOpen, setWelcomeOpen] = useState(true);
+  const [donationAmount, setDonationAmount] = useState(5);
   const [notice, setNotice] = useState('');
   const workspaceRef = useRef<HTMLDivElement>(null);
   const fileInputRef = useRef<HTMLInputElement>(null);
@@ -444,6 +448,11 @@ export default function App() {
     }
   };
 
+  const openDonation = () => {
+    const amount = clampNumber(donationAmount, 1, 500, 5);
+    window.open(`https://cash.app/$MatthewPuckett/${amount}`, '_blank', 'noopener,noreferrer');
+  };
+
   const captureWorkspace = async () => {
     if (!workspaceRef.current) {
       throw new Error('Workspace is not ready.');
@@ -683,6 +692,64 @@ export default function App() {
           </DialogActions>
         </Dialog>
 
+        <Dialog open={welcomeOpen} onClose={() => setWelcomeOpen(false)} maxWidth="sm" fullWidth>
+          <DialogTitle sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
+            <Dns color="primary" />
+            Welcome to Datacenter Modeler
+          </DialogTitle>
+          <DialogContent>
+            <Stack spacing={2.5}>
+              <Typography color="text.secondary">
+                Build rack and cabinet diagrams by dragging components onto the workspace, snapping equipment into rack units,
+                editing metadata in the properties panel, and exporting your layout as JSON, images, or a PDF report.
+              </Typography>
+
+              <Divider />
+
+              <Box>
+                <Stack direction="row" alignItems="center" spacing={1} sx={{ mb: 1 }}>
+                  <VolunteerActivism color="secondary" />
+                  <Typography variant="subtitle1" sx={{ fontWeight: 800 }}>
+                    Support the project
+                  </Typography>
+                </Stack>
+                <Typography variant="body2" color="text.secondary" sx={{ mb: 2 }}>
+                  This application was made by a homebrew developer. A donation is appreciated if this tool helps you,
+                  but it is absolutely not required.
+                </Typography>
+                <Stack spacing={1.5}>
+                  <Stack direction="row" spacing={1} flexWrap="wrap" useFlexGap>
+                    {[5, 10, 20, 50].map((amount) => (
+                      <Button
+                        key={amount}
+                        size="small"
+                        variant={donationAmount === amount ? 'contained' : 'outlined'}
+                        onClick={() => setDonationAmount(amount)}
+                      >
+                        ${amount}
+                      </Button>
+                    ))}
+                  </Stack>
+                  <TextField
+                    label="Donation amount"
+                    type="number"
+                    value={donationAmount}
+                    inputProps={{ min: 1, max: 500 }}
+                    onChange={(event) => setDonationAmount(clampNumber(event.target.value, 1, 500, donationAmount))}
+                    fullWidth
+                  />
+                  <Button variant="contained" color="secondary" startIcon={<VolunteerActivism />} endIcon={<OpenInNew />} onClick={openDonation}>
+                    Donate with Cash App
+                  </Button>
+                </Stack>
+              </Box>
+            </Stack>
+          </DialogContent>
+          <DialogActions>
+            <Button onClick={() => setWelcomeOpen(false)}>Continue to app</Button>
+          </DialogActions>
+        </Dialog>
+
         <Snackbar open={Boolean(notice)} autoHideDuration={3200} message={notice} onClose={() => setNotice('')} />
       </Box>
     </ThemeProvider>