diff --git a/gui/src/app/pages/HomePage/BrowserProjectsInterface.ts b/gui/src/app/pages/HomePage/BrowserProjectsInterface.ts
new file mode 100644
index 00000000..3f173ed0
--- /dev/null
+++ b/gui/src/app/pages/HomePage/BrowserProjectsInterface.ts
@@ -0,0 +1,141 @@
+import baseObjectCheck from "@SpUtil/baseObjectCheck";
+
+export type BrowserProject = {
+  title: string;
+  timestamp: number;
+  fileManifest: { [name: string]: string };
+};
+
+const isBrowserProject = (value: any): value is BrowserProject => {
+  if (!baseObjectCheck(value)) return false;
+  if (typeof value.timestamp !== "number") return false;
+  if (!baseObjectCheck(value.fileManifest)) return false;
+  for (const key in value.fileManifest) {
+    if (typeof key !== "string") return false;
+    if (typeof value.fileManifest[key] !== "string") return false;
+  }
+  return true;
+};
+
+export class BrowserProjectsInterface {
+  constructor(
+    private dbName: string = "stan-playground",
+    private dbVersion: number = 2,
+    private storeName: string = "browser-projects",
+  ) {}
+  async loadBrowserProject(title: string) {
+    const objectStore = await this.openObjectStore("readonly");
+    const filename = `${title}.json`;
+    const content = await this.getTextFile(objectStore, filename);
+    if (!content) return null;
+    const bp = JSON.parse(content);
+    if (!isBrowserProject(bp)) {
+      console.warn(`Invalid browser project: ${title}`);
+      return null;
+    }
+    return bp;
+  }
+  async saveBrowserProject(title: string, browserProject: BrowserProject) {
+    const objectStore = await this.openObjectStore("readwrite");
+    const filename = `${title}.json`;
+    return await this.setTextFile(
+      objectStore,
+      filename,
+      JSON.stringify(browserProject, null, 2),
+    );
+  }
+  async getAllBrowserProjects() {
+    const titles = await this.getAllProjectTitles();
+    const browserProjects = [];
+    for (const title of titles) {
+      const browserProject = await this.loadBrowserProject(title);
+      if (browserProject) {
+        browserProjects.push(browserProject);
+      }
+    }
+    return browserProjects;
+  }
+  async deleteProject(title: string) {
+    const objectStore = await this.openObjectStore("readwrite");
+    const filename = `${title}.json`;
+    await this.deleteTextFile(objectStore, filename);
+  }
+  private async openDatabase() {
+    return new Promise<IDBDatabase>((resolve, reject) => {
+      const request = indexedDB.open(this.dbName, this.dbVersion);
+      request.onupgradeneeded = () => {
+        const db = request.result;
+        if (!db.objectStoreNames.contains(this.storeName)) {
+          db.createObjectStore(this.storeName, { keyPath: "name" });
+        }
+      };
+      request.onsuccess = () => {
+        resolve(request.result);
+      };
+      request.onerror = () => {
+        reject(request.error);
+      };
+    });
+  }
+  private async openObjectStore(mode: IDBTransactionMode) {
+    const db = await this.openDatabase();
+    const transaction = db.transaction(this.storeName, mode);
+    return transaction.objectStore(this.storeName);
+  }
+  private async getAllProjectTitles(): Promise<string[]> {
+    const objectStore = await this.openObjectStore("readonly");
+    return new Promise<string[]>((resolve, reject) => {
+      const request = objectStore.getAllKeys();
+      request.onsuccess = () => {
+        resolve(
+          request.result.map((key) => {
+            return key.toString().replace(/\.json$/, "");
+          }),
+        );
+      };
+      request.onerror = () => {
+        reject(request.error);
+      };
+    });
+  }
+  private async getTextFile(objectStore: IDBObjectStore, filename: string) {
+    return new Promise<string | null>((resolve, reject) => {
+      const getRequest = objectStore.get(filename);
+      getRequest.onsuccess = () => {
+        resolve(getRequest.result?.content || null);
+      };
+      getRequest.onerror = () => {
+        reject(getRequest.error);
+      };
+    });
+  }
+  private async setTextFile(
+    objectStore: IDBObjectStore,
+    filename: string,
+    content: string,
+  ) {
+    return new Promise<void>((resolve, reject) => {
+      const file = { name: filename, content: content };
+      const putRequest = objectStore.put(file);
+      putRequest.onsuccess = () => {
+        resolve();
+      };
+      putRequest.onerror = () => {
+        reject(putRequest.error);
+      };
+    });
+  }
+  private async deleteTextFile(objectStore: IDBObjectStore, filename: string) {
+    return new Promise<void>((resolve, reject) => {
+      const deleteRequest = objectStore.delete(filename);
+      deleteRequest.onsuccess = () => {
+        resolve();
+      };
+      deleteRequest.onerror = () => {
+        reject(deleteRequest.error);
+      };
+    });
+  }
+}
+
+export default BrowserProjectsInterface;
diff --git a/gui/src/app/pages/HomePage/LoadProjectWindow.tsx b/gui/src/app/pages/HomePage/LoadProjectWindow.tsx
index 27706868..df924aa5 100644
--- a/gui/src/app/pages/HomePage/LoadProjectWindow.tsx
+++ b/gui/src/app/pages/HomePage/LoadProjectWindow.tsx
@@ -1,4 +1,3 @@
-import Button from "@mui/material/Button";
 import {
   FieldsContentsMap,
   FileNames,
@@ -8,6 +7,10 @@ import {
 import { ProjectContext } from "@SpCore/ProjectContextProvider";
 import { deserializeZipToFiles, parseFile } from "@SpCore/ProjectSerialization";
 import UploadFilesArea from "@SpPages/UploadFilesArea";
+import { SmallIconButton } from "@fi-sci/misc";
+import { Delete } from "@mui/icons-material";
+import Link from "@mui/material/Link";
+import Button from "@mui/material/Button";
 import {
   FunctionComponent,
   useCallback,
@@ -15,6 +18,10 @@ import {
   useEffect,
   useState,
 } from "react";
+import BrowserProjectsInterface, {
+  BrowserProject,
+} from "./BrowserProjectsInterface";
+import timeAgoString from "@SpUtil/timeAgoString";
 
 type LoadProjectWindowProps = {
   onClose: () => void;
@@ -103,9 +110,38 @@ const LoadProjectWindow: FunctionComponent<LoadProjectWindowProps> = ({
     }
   }, [filesUploaded, importUploadedFiles]);
 
+  const [allBrowserProjects, setAllBrowserProjects] = useState<
+    BrowserProject[]
+  >([]);
+  useEffect(() => {
+    const bpi = new BrowserProjectsInterface();
+    bpi.getAllBrowserProjects().then((p) => {
+      setAllBrowserProjects(p);
+    });
+  }, []);
+
+  const handleOpenBrowserProject = useCallback(
+    async (title: string) => {
+      const bpi = new BrowserProjectsInterface();
+      const browserProject = await bpi.loadBrowserProject(title);
+      if (!browserProject) {
+        alert("Failed to load project");
+        return;
+      }
+      const { fileManifest } = browserProject;
+      update({
+        type: "loadFiles",
+        files: mapFileContentsToModel(fileManifest),
+        clearExisting: true,
+      });
+      onClose();
+    },
+    [update, onClose],
+  );
+
   return (
     <div>
-      <h3>Load project</h3>
+      <h3>Upload project</h3>
       <div>
         You can upload:
         <ul>
@@ -142,6 +178,50 @@ const LoadProjectWindow: FunctionComponent<LoadProjectWindowProps> = ({
           </Button>
         </div>
       )}
+      <h3>Load from browser</h3>
+      {allBrowserProjects.length > 0 ? (
+        <table>
+          <tbody>
+            {allBrowserProjects.map((browserProject) => (
+              <tr key={browserProject.title}>
+                <td>
+                  <SmallIconButton
+                    icon={<Delete />}
+                    onClick={async () => {
+                      const ok = window.confirm(
+                        `Delete project "${browserProject.title}" from browser?`,
+                      );
+                      if (!ok) return;
+                      const bpi = new BrowserProjectsInterface();
+                      await bpi.deleteProject(browserProject.title);
+                      const p = await bpi.getAllBrowserProjects();
+                      setAllBrowserProjects(p);
+                    }}
+                  />
+                </td>
+                <td>
+                  <Link
+                    onClick={() => {
+                      handleOpenBrowserProject(browserProject.title);
+                    }}
+                    component="button"
+                    underline="none"
+                  >
+                    {browserProject.title}
+                  </Link>
+                </td>
+                <td>
+                  <span style={{ color: "gray" }}>
+                    {timeAgoString(browserProject.timestamp)}
+                  </span>
+                </td>
+              </tr>
+            ))}
+          </tbody>
+        </table>
+      ) : (
+        <div>No projects found in browser storage</div>
+      )}
     </div>
   );
 };
diff --git a/gui/src/app/pages/HomePage/SaveProjectWindow.tsx b/gui/src/app/pages/HomePage/SaveProjectWindow.tsx
index 42dcd0d4..b6542a69 100644
--- a/gui/src/app/pages/HomePage/SaveProjectWindow.tsx
+++ b/gui/src/app/pages/HomePage/SaveProjectWindow.tsx
@@ -6,6 +6,8 @@ import { ProjectContext } from "@SpCore/ProjectContextProvider";
 import saveAsGitHubGist from "@SpCore/gists/saveAsGitHubGist";
 import { triggerDownload } from "@SpUtil/triggerDownload";
 import Button from "@mui/material/Button";
+import BrowserProjectsInterface from "./BrowserProjectsInterface";
+import timeAgoString from "@SpUtil/timeAgoString";
 
 type SaveProjectWindowProps = {
   onClose: () => void;
@@ -18,6 +20,7 @@ const SaveProjectWindow: FunctionComponent<SaveProjectWindowProps> = ({
   const fileManifest = mapModelToFileManifest(data);
 
   const [exportingToGist, setExportingToGist] = useState(false);
+  const [savingToBrowser, setSavingToBrowser] = useState(false);
 
   return (
     <div>
@@ -47,7 +50,7 @@ const SaveProjectWindow: FunctionComponent<SaveProjectWindowProps> = ({
         </tbody>
       </table>
       <div>&nbsp;</div>
-      {!exportingToGist && (
+      {!exportingToGist && !savingToBrowser && (
         <div>
           <Button
             onClick={async () => {
@@ -66,6 +69,14 @@ const SaveProjectWindow: FunctionComponent<SaveProjectWindowProps> = ({
           >
             Save to GitHub Gist
           </Button>
+          &nbsp;
+          <Button
+            onClick={() => {
+              setSavingToBrowser(true);
+            }}
+          >
+            Save to Browser
+          </Button>
         </div>
       )}
       {exportingToGist && (
@@ -75,6 +86,13 @@ const SaveProjectWindow: FunctionComponent<SaveProjectWindowProps> = ({
           onClose={onClose}
         />
       )}
+      {savingToBrowser && (
+        <SaveToBrowserView
+          fileManifest={fileManifest}
+          title={data.meta.title}
+          onCancel={onClose}
+        />
+      )}
     </div>
   );
 };
@@ -211,4 +229,64 @@ const makeSPShareableLinkFromGistUrl = (gistUrl: string) => {
   return url;
 };
 
+type SaveToBrowserViewProps = {
+  fileManifest: Partial<FileRegistry>;
+  title: string;
+  onCancel: () => void;
+};
+
+const SaveToBrowserView: FunctionComponent<SaveToBrowserViewProps> = ({
+  fileManifest,
+  title,
+  onCancel,
+}) => {
+  // use IndexedDB to save the project
+  // https://developer.mozilla.org/en-US/docs/Web/API/IndexedDB_API/Using_IndexedDB
+
+  const handleSave = useCallback(async () => {
+    try {
+      const bpi = new BrowserProjectsInterface();
+      const existingBrowserProject = await bpi.loadBrowserProject(title);
+      if (existingBrowserProject) {
+        const overwrite = window.confirm(
+          `A project with the title "${title}" already exists (modified ${timeAgoString(existingBrowserProject.timestamp)}). Do you want to overwrite it?`,
+        );
+        if (!overwrite) {
+          return;
+        }
+      }
+      await bpi.saveBrowserProject(title, {
+        title,
+        timestamp: Date.now(),
+        fileManifest,
+      });
+    } catch (err: any) {
+      alert(`Error saving to browser: ${err.message}`);
+    }
+    onCancel();
+  }, [title, fileManifest, onCancel]);
+
+  return (
+    <div className="SaveToBrowserView">
+      <h3>Save to Browser</h3>
+      <p>
+        This project will be saved to your browser as &quot;{title}&quot;. It
+        will be available to you on this device until you clear your browser
+        cache, but not on other devices or browsers.
+      </p>
+      <div>
+        <Button
+          onClick={() => {
+            handleSave();
+          }}
+        >
+          Save to Browser
+        </Button>
+        &nbsp;
+        <Button onClick={onCancel}>Cancel</Button>
+      </div>
+    </div>
+  );
+};
+
 export default SaveProjectWindow;
diff --git a/gui/src/app/util/timeAgoString.ts b/gui/src/app/util/timeAgoString.ts
new file mode 100644
index 00000000..af3afe26
--- /dev/null
+++ b/gui/src/app/util/timeAgoString.ts
@@ -0,0 +1,27 @@
+const timeAgoString = (timestampMsec?: number) => {
+  if (timestampMsec === undefined) return "";
+  const timestampSeconds = Math.floor(timestampMsec / 1000);
+  const now = Date.now();
+  const diff = now - timestampSeconds * 1000;
+  const diffSeconds = Math.floor(diff / 1000);
+  const diffMinutes = Math.floor(diffSeconds / 60);
+  const diffHours = Math.floor(diffMinutes / 60);
+  const diffDays = Math.floor(diffHours / 24);
+  const diffWeeks = Math.floor(diffDays / 7);
+  const diffYears = Math.floor(diffDays / 365);
+  if (diffYears > 0) {
+    return `${diffYears} yr${diffYears === 1 ? "" : "s"} ago`;
+  } else if (diffWeeks > 0) {
+    return `${diffWeeks} wk${diffWeeks === 1 ? "" : "s"} ago`;
+  } else if (diffDays > 0) {
+    return `${diffDays} day${diffDays === 1 ? "" : "s"} ago`;
+  } else if (diffHours > 0) {
+    return `${diffHours} hr${diffHours === 1 ? "" : "s"} ago`;
+  } else if (diffMinutes > 0) {
+    return `${diffMinutes} min ago`;
+  } else {
+    return `${diffSeconds} sec ago`;
+  }
+};
+
+export default timeAgoString;