diff --git a/tools/diffize_coins_details.py b/tools/diffize_coins_details.py
new file mode 100755
index 0000000000..430b8f2726
--- /dev/null
+++ b/tools/diffize_coins_details.py
@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+
+import click
+import json
+import os
+import requests
+import tempfile
+import subprocess
+import sys
+
+
+LIVE_URL = "https://trezor.io/static/json/coins_details.json"
+COINS_DETAILS = os.path.join(
+    os.path.dirname(__file__), "..", "defs", "coins_details.json"
+)
+
+
+def diffize_file(coins_details, tmp):
+    coins_list = list(coins_details["coins"].values())
+    for coin in coins_list:
+        coin.pop("marketcap_usd", None)
+        links = coin.get("links", {})
+        wallets = coin.get("wallet", {})
+        for link in links:
+            links[link] = links[link].rstrip("/")
+        for wallet in wallets:
+            wallets[wallet] = wallets[wallet].rstrip("/")
+
+        if not coin.get("wallet"):
+            coin.pop("wallet", None)
+
+    coins_list.sort(key=lambda c: c["name"])
+
+    for coin in coins_list:
+        name = coin["name"]
+        for key in coin:
+            print(name, "\t", key, ":", coin[key], file=tmp)
+    tmp.flush()
+
+
+@click.command()
+def cli():
+    """Compare data from trezor.io/coins with current coins_details.json
+
+    Shows a nicely formatted diff between the live version and the trezor-common
+    version. Useful for catching auto-generation problems, etc.
+    """
+    live_json = requests.get(LIVE_URL).json()
+    with open(COINS_DETAILS) as f:
+        coins_details = json.load(f)
+
+    Tmp = tempfile.NamedTemporaryFile
+    with Tmp("w") as tmpA, Tmp("w") as tmpB:
+        diffize_file(live_json, tmpA)
+        diffize_file(coins_details, tmpB)
+        subprocess.call(["diff", "-u", "--color=auto", tmpA.name, tmpB.name])
+
+
+if __name__ == "__main__":
+    cli()