diff --git a/sandbox/ndx-stats/TODO b/sandbox/ndx-stats/TODO
new file mode 100644
index 000000000..a45d24f68
--- /dev/null
+++ b/sandbox/ndx-stats/TODO
@@ -0,0 +1 @@
+just move inside the client
diff --git a/sandbox/ndx-stats/dandisets-20240212-all.json b/sandbox/ndx-stats/dandisets-20240212-all.json
new file mode 100644
index 000000000..7422435c4
--- /dev/null
+++ b/sandbox/ndx-stats/dandisets-20240212-all.json
@@ -0,0 +1,9514 @@
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+      "versions": {
+        "1.8.0": 18
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 18,
+      "versions": {
+        "0.5.0": 18
+      }
+    }
+  ],
+  "001246": [],
+  "001247": [],
+  "001248": [
+    {
+      "name": "core",
+      "total_count": 2,
+      "versions": {
+        "2.7.0": 2
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 2,
+      "versions": {
+        "1.8.0": 2
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 2,
+      "versions": {
+        "0.5.0": 2
+      }
+    }
+  ],
+  "001249": [
+    {
+      "name": "core",
+      "total_count": 14,
+      "versions": {
+        "2.7.0": 14
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 14,
+      "versions": {
+        "1.8.0": 14
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 14,
+      "versions": {
+        "0.5.0": 14
+      }
+    }
+  ],
+  "001250": [
+    {
+      "name": "core",
+      "total_count": 20,
+      "versions": {
+        "2.7.0": 20
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 20,
+      "versions": {
+        "1.8.0": 20
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 20,
+      "versions": {
+        "0.5.0": 20
+      }
+    }
+  ],
+  "001251": [],
+  "001252": [],
+  "001253": [],
+  "001254": [],
+  "001256": [
+    {
+      "name": "core",
+      "total_count": 30,
+      "versions": {
+        "2.7.0": 30
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 30,
+      "versions": {
+        "1.8.0": 30
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 30,
+      "versions": {
+        "0.5.0": 30
+      }
+    }
+  ],
+  "001257": [],
+  "001258": [
+    {
+      "name": "core",
+      "total_count": 69,
+      "versions": {
+        "2.7.0": 69
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 69,
+      "versions": {
+        "1.8.0": 69
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 69,
+      "versions": {
+        "0.5.0": 69
+      }
+    },
+    {
+      "name": "ndx-fiber-photometry",
+      "total_count": 69,
+      "versions": {
+        "0.1.0": 69
+      }
+    }
+  ],
+  "001260": [],
+  "001261": [],
+  "001262": [],
+  "001263": [],
+  "001266": [
+    {
+      "name": "core",
+      "total_count": 83,
+      "versions": {
+        "2.7.0": 83
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 83,
+      "versions": {
+        "1.8.0": 83
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 83,
+      "versions": {
+        "0.5.0": 83
+      }
+    }
+  ],
+  "001271": [
+    {
+      "name": "core",
+      "total_count": 287,
+      "versions": {
+        "2.6.0-alpha": 287
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 287,
+      "versions": {
+        "1.8.0": 287
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 287,
+      "versions": {
+        "0.5.0": 287
+      }
+    }
+  ],
+  "001272": [
+    {
+      "name": "core",
+      "total_count": 65,
+      "versions": {
+        "2.6.0-alpha": 65
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 65,
+      "versions": {
+        "1.8.0": 65
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 65,
+      "versions": {
+        "0.5.0": 65
+      }
+    }
+  ],
+  "001273": [
+    {
+      "name": "core",
+      "total_count": 181,
+      "versions": {
+        "2.6.0-alpha": 181
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 181,
+      "versions": {
+        "1.8.0": 181
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 181,
+      "versions": {
+        "0.5.0": 181
+      }
+    }
+  ],
+  "001274": [
+    {
+      "name": "core",
+      "total_count": 232,
+      "versions": {
+        "2.6.0-alpha": 232
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 232,
+      "versions": {
+        "1.8.0": 232
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 232,
+      "versions": {
+        "0.5.0": 232
+      }
+    }
+  ],
+  "001275": [
+    {
+      "name": "core",
+      "total_count": 20,
+      "versions": {
+        "2.6.0-alpha": 20
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 20,
+      "versions": {
+        "1.8.0": 20
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 20,
+      "versions": {
+        "0.5.0": 20
+      }
+    },
+    {
+      "name": "ndx-events",
+      "total_count": 20,
+      "versions": {
+        "0.2.0": 20
+      }
+    }
+  ],
+  "001276": [
+    {
+      "name": "core",
+      "total_count": 108,
+      "versions": {
+        "2.6.0-alpha": 108
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 108,
+      "versions": {
+        "1.8.0": 108
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 108,
+      "versions": {
+        "0.5.0": 108
+      }
+    }
+  ],
+  "001277": [
+    {
+      "name": "core",
+      "total_count": 49,
+      "versions": {
+        "2.6.0-alpha": 49
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 49,
+      "versions": {
+        "1.8.0": 49
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 49,
+      "versions": {
+        "0.5.0": 49
+      }
+    }
+  ],
+  "001280": [
+    {
+      "name": "core",
+      "total_count": 120,
+      "versions": {
+        "2.6.0-alpha": 120
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 120,
+      "versions": {
+        "1.6.0": 119,
+        "1.8.0": 1
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 120,
+      "versions": {
+        "0.3.0": 119,
+        "0.5.0": 1
+      }
+    },
+    {
+      "name": "ndx-franklab-novela",
+      "total_count": 120,
+      "versions": {
+        "0.1.0": 120
+      }
+    },
+    {
+      "name": "ndx-xarray",
+      "total_count": 119,
+      "versions": {
+        "0.1.0": 119
+      }
+    }
+  ],
+  "001281": [
+    {
+      "name": "core",
+      "total_count": 457,
+      "versions": {
+        "2.5.0": 457
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 457,
+      "versions": {
+        "1.5.1": 457
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 457,
+      "versions": {
+        "0.2.0": 457
+      }
+    }
+  ],
+  "001282": [
+    {
+      "name": "core",
+      "total_count": 2,
+      "versions": {
+        "2.7.0": 2
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 2,
+      "versions": {
+        "1.8.0": 2
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 2,
+      "versions": {
+        "0.5.0": 2
+      }
+    }
+  ],
+  "001283": [],
+  "001284": [
+    {
+      "name": "core",
+      "total_count": 84,
+      "versions": {
+        "2.6.0-alpha": 84
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 84,
+      "versions": {
+        "1.8.0": 84
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 84,
+      "versions": {
+        "0.5.0": 84
+      }
+    }
+  ],
+  "001285": [
+    {
+      "name": "core",
+      "total_count": 1,
+      "versions": {
+        "2.7.0": 1
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 1,
+      "versions": {
+        "1.8.0": 1
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 1,
+      "versions": {
+        "0.5.0": 1
+      }
+    }
+  ],
+  "001286": [],
+  "001287": [],
+  "001289": [],
+  "001290": [
+    {
+      "name": "core",
+      "total_count": 1,
+      "versions": {
+        "2.7.0": 1
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 1,
+      "versions": {
+        "1.8.0": 1
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 1,
+      "versions": {
+        "0.5.0": 1
+      }
+    }
+  ],
+  "001291": [],
+  "001292": [],
+  "001325": [],
+  "001327": [],
+  "001328": [],
+  "001330": [],
+  "001332": [],
+  "001333": [
+    {
+      "name": "core",
+      "total_count": 1,
+      "versions": {
+        "2.8.0": 1
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 1,
+      "versions": {
+        "1.8.0": 1
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 1,
+      "versions": {
+        "0.5.0": 1
+      }
+    }
+  ],
+  "001334": [],
+  "001335": [
+    {
+      "name": "core",
+      "total_count": 1,
+      "versions": {
+        "2.7.0": 1
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 1,
+      "versions": {
+        "1.8.0": 1
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 1,
+      "versions": {
+        "0.5.0": 1
+      }
+    }
+  ],
+  "001336": [],
+  "001337": [
+    {
+      "name": "core",
+      "total_count": 223,
+      "versions": {
+        "2.6.0-alpha": 223
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 223,
+      "versions": {
+        "1.8.0": 223
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 223,
+      "versions": {
+        "0.5.0": 223
+      }
+    }
+  ],
+  "001339": [
+    {
+      "name": "core",
+      "total_count": 82,
+      "versions": {
+        "2.6.0-alpha": 82
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 82,
+      "versions": {
+        "1.8.0": 82
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 82,
+      "versions": {
+        "0.5.0": 82
+      }
+    }
+  ],
+  "001340": [
+    {
+      "name": "core",
+      "total_count": 69,
+      "versions": {
+        "2.7.0": 69
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 69,
+      "versions": {
+        "1.8.0": 69
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 69,
+      "versions": {
+        "0.5.0": 69
+      }
+    },
+    {
+      "name": "ndx-fiber-photometry",
+      "total_count": 69,
+      "versions": {
+        "0.1.0": 69
+      }
+    }
+  ],
+  "001341": [
+    {
+      "name": "core",
+      "total_count": 2,
+      "versions": {
+        "2.7.0": 2
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 2,
+      "versions": {
+        "1.8.0": 2
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 2,
+      "versions": {
+        "0.5.0": 2
+      }
+    }
+  ],
+  "001342": [],
+  "001348": [],
+  "001349": [],
+  "001350": [],
+  "001351": [],
+  "001354": [
+    {
+      "name": "core",
+      "total_count": 50,
+      "versions": {
+        "2.8.0": 50
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 50,
+      "versions": {
+        "1.8.0": 50
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 50,
+      "versions": {
+        "0.5.0": 50
+      }
+    },
+    {
+      "name": "ndx-dandi-icephys",
+      "total_count": 50,
+      "versions": {
+        "0.3.0": 50
+      }
+    }
+  ],
+  "001355": [],
+  "001356": [],
+  "001357": [
+    {
+      "name": "core",
+      "total_count": 159,
+      "versions": {
+        "2.8.0": 159
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 159,
+      "versions": {
+        "1.8.0": 159
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 159,
+      "versions": {
+        "0.5.0": 159
+      }
+    }
+  ],
+  "001358": [
+    {
+      "name": "core",
+      "total_count": 131,
+      "versions": {
+        "2.7.0": 131
+      }
+    },
+    {
+      "name": "hdmf-common",
+      "total_count": 131,
+      "versions": {
+        "1.8.0": 131
+      }
+    },
+    {
+      "name": "hdmf-experimental",
+      "total_count": 131,
+      "versions": {
+        "0.5.0": 131
+      }
+    }
+  ],
+  "001359": [],
+  "001360": [],
+  "001362": []
+}
\ No newline at end of file
diff --git a/sandbox/ndx-stats/ndx-stats.py b/sandbox/ndx-stats/ndx-stats.py
new file mode 100755
index 000000000..5968a867b
--- /dev/null
+++ b/sandbox/ndx-stats/ndx-stats.py
@@ -0,0 +1,213 @@
+#!/usr/bin/env python3
+"""
+A Python script to extract extension specifications and versions from NWB files.
+Supports both local files and remote URLs, and outputs statistics on extension usage.
+"""
+
+import argparse
+from collections import defaultdict
+from dataclasses import asdict, dataclass, field, is_dataclass
+import json
+import sys
+from typing import Dict, List
+
+import h5py
+from nwbinspector.tools import get_s3_urls_and_dandi_paths
+from packaging import version
+from tqdm import tqdm
+
+from dandi.dandiapi import DandiAPIClient
+
+# For remote file access
+try:
+    import remfile
+
+    REMOTE_ACCESS_AVAILABLE = True
+except ImportError:
+    REMOTE_ACCESS_AVAILABLE = False
+
+
+@dataclass
+class ExtensionStats:
+    """Data class to store statistics about an NWB extension."""
+
+    name: str
+    total_count: int = 0
+    versions: Dict[str, int] = field(default_factory=lambda: defaultdict(int))
+
+
+class EnhancedJSONEncoder(json.JSONEncoder):
+    def default(self, obj):
+        if is_dataclass(obj):
+            return asdict(obj)
+        return super().default(obj)
+
+
+def get_nwb_specifications(file_path: str, is_url: bool = False) -> Dict[str, str]:
+    """
+    Extract all specification names and versions from an NWB file.
+
+    Args:
+        file_path: URL to the NWB file
+        is_url: Whether the file_path is a URL
+
+    Returns:
+        Dictionary containing the specification names and versions
+    """
+    specifications = {}
+
+    try:
+        if is_url:
+            if not REMOTE_ACCESS_AVAILABLE:
+                raise ImportError("remfile is required for remote file access")
+
+            # Open remote file using remfile
+            f = remfile.File(file_path)
+            try:
+                h5_file = h5py.File(f, "r")
+                # Need to use a context manager for the h5py file
+                with h5_file as h5f:
+                    specifications = _extract_specifications(h5f)
+            finally:
+                f.close()
+        else:
+            # Local file
+            with h5py.File(file_path, "r") as f:
+                specifications = _extract_specifications(f)
+
+    except Exception as e:
+        print(f"Error processing file {file_path}: {str(e)}", file=sys.stderr)
+
+    return specifications
+
+
+def _extract_specifications(h5_file) -> Dict[str, str]:
+    """Extract specifications from an opened h5py File object."""
+    specifications = {}
+
+    if "specifications" in h5_file:
+        specs_group = h5_file["specifications"]
+        if len(specs_group) > 0:
+            for name in specs_group:
+                extension_group = specs_group[name]
+                if not isinstance(extension_group, h5py.Group):
+                    continue
+
+                try:
+                    sorted_versions = sorted(extension_group, key=version.parse)
+                    if len(sorted_versions) > 0:
+                        # Use only the latest version
+                        latest_version = sorted_versions[-1]
+                        specifications[name] = latest_version
+                except Exception as e:
+                    print(
+                        f"Error processing extension {name}: {str(e)}", file=sys.stderr
+                    )
+
+    return specifications
+
+
+def analyze_extensions(
+    file_paths: List[str], is_url: bool = False
+) -> List[ExtensionStats]:
+    """
+    Analyze extensions across multiple NWB files.
+
+    Args:
+        file_paths: List of paths or URLs to NWB files
+        is_url: Whether the file_paths are URLs
+
+    Returns:
+        List of ExtensionStats objects
+    """
+    # Dictionary to store extension statistics
+    extension_stats = {}
+
+    # Process each file
+    for file_path in tqdm(file_paths, desc="Processing NWB files"):
+        specifications = get_nwb_specifications(file_path, is_url)
+
+        # Filter out core specifications that are not extensions
+        extensions = {
+            k: v
+            for k, v in specifications.items()
+            # if k not in ["core", "hdmf-common", "hdmf-experimental"]
+        }
+
+        # Update statistics
+        for ext_name, ext_version in extensions.items():
+            if ext_name not in extension_stats:
+                extension_stats[ext_name] = ExtensionStats(name=ext_name)
+
+            extension_stats[ext_name].total_count += 1
+            extension_stats[ext_name].versions[ext_version] += 1
+
+    # Convert to list for output
+    return list(extension_stats.values())
+
+def snapshot_result(result, output):
+    out = json.dumps(result, indent=2, cls=EnhancedJSONEncoder)
+    if output:
+        with open(output, "w") as f:
+            f.write(out)
+    return out
+
+def main():
+    parser = argparse.ArgumentParser(description="Analyze NWB file extensions")
+
+    # Input source group (mutually exclusive)
+    input_group = parser.add_mutually_exclusive_group(required=True)
+    input_group.add_argument("-f", "--files", nargs="+", help="Local NWB file path(s)")
+    input_group.add_argument("-u", "--urls", nargs="+", help="URL(s) to NWB file(s)")
+    input_group.add_argument(
+        "-d",
+        "--dandisets",
+        default=None,
+        nargs="*",
+        help="Dandisets to work on. If none specified but option is given, will process all",
+    )
+
+    # Output options
+    parser.add_argument(
+        "-o", "--output", help="Output JSON file path (default: stdout)"
+    )
+
+    args = parser.parse_args()
+
+    # Determine input source
+    if args.dandisets is not None:
+        if not args.dandisets:  # specified but none specifically
+            client = DandiAPIClient()
+            dandisets = list(client.get_dandisets())
+            args.dandisets = [d.identifier for d in dandisets]
+        print(f"Analyzing {len(args.dandisets)} dandisets", file=sys.stderr)
+        result = {}
+        for d in tqdm(args.dandisets):
+            urls = get_s3_urls_and_dandi_paths(dandiset_id=d)
+            nwb_urls = [url for url, path in urls.items() if path.endswith(".nwb")]
+            result[d] = analyze_extensions(nwb_urls, True)
+            snapshot_result(result, args.output)
+    else:
+        if args.files:
+            file_paths = args.files
+            is_url = False
+        else:  # args.urls
+            file_paths = args.urls
+            is_url = True
+            if not REMOTE_ACCESS_AVAILABLE:
+                parser.error("remfile is required for URL access. ")
+
+        # Analyze extensions
+        extension_stats = analyze_extensions(file_paths, is_url)
+
+        # Convert to serializable format
+        result = [asdict(stat) for stat in extension_stats]
+
+    # Output results
+    out = snapshot_result(result, args.output)
+    if not args.output:
+        print(out)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/sandbox/ndx-stats/requirements.txt b/sandbox/ndx-stats/requirements.txt
new file mode 100644
index 000000000..8c06abfb0
--- /dev/null
+++ b/sandbox/ndx-stats/requirements.txt
@@ -0,0 +1,6 @@
+h5py
+packaging
+tqdm
+remfile
+fsspec
+nwbinspector