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diff --git a/spike/settings/test-strings/make_test_strings.py b/spike/settings/test-strings/make_test_strings.py
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+++ b/spike/settings/test-strings/make_test_strings.py
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+#!/usr/bin/env python3
+# Author:  cirakg & claude ai
+# Summary: Generate the settings-spike test strings: one .txt per string and an index.html with copy buttons.
+"""Generate the test strings for the M1 settings spike (docs/SETTINGS_SPIKE.md).
+
+Length strings look like
+    N=1000|abcdef...P0050...P0100...xyzEND
+"N=<length>|" says how long the string should be, a marker "P<position>"
+sits at every 50th character, and "END" closes it. If the phone app cuts a
+string, the watch shows a wrong length and no "END"; the last marker it shows
+tells roughly where the cut happened. Only letters, digits, "=", "|" are
+used, so the length tests don't also test character handling.
+
+special.txt holds the characters that may be rejected (& < > \\ " { } %),
+non-ASCII text, a fake otpauth URI and a JSON fragment.
+
+Usage: python3 make_test_strings.py   (writes into its own folder)
+"""
+
+from __future__ import annotations
+
+import html
+from pathlib import Path
+
+LENGTHS = (100, 255, 256, 500, 800, 801, 1000, 2000, 4000, 8000)
+SPECIAL = (
+    'special: & < > \\ " { } % | non-ASCII: äöü ß € 😀 | '
+    "otpauth://totp/Fake:alice?secret=JBSWY3DPEHPK3PXP&issuer=Fake&digits=6 | "
+    '{"name":"Fake","path":"a\\/b"} END'
+)
+HEADER = (
+    "# Author:  cirakg & claude ai\n# Summary: {summary}\n"
+    "# Copy ONLY the last line (the test string) into a settings field.\n\n"
+)
+LETTERS = "abcdefghijklmnopqrstuvwxyz"
+
+
+def marker_string(length: int) -> str:
+    """A string of exactly `length` characters with position markers."""
+    text = f"N={length}|"
+    i = 0
+    while len(text) < length - 3:
+        pos = len(text)
+        if pos % 50 == 0 and pos + 5 <= length - 3:
+            text += f"P{pos:04d}"
+        else:
+            text += LETTERS[i % len(LETTERS)]
+            i += 1
+    text += "END"
+    assert len(text) == length, (length, len(text))
+    return text
+
+
+def main() -> None:
+    here = Path(__file__).resolve().parent
+    entries = [(f"len-{n:04d}", f"{n} characters", marker_string(n)) for n in LENGTHS]
+    entries.append(("special", "special characters", SPECIAL))
+    for name, label, value in entries:
+        (here / f"{name}.txt").write_text(HEADER.format(summary=f"Settings spike test string: {label}.") + value + "\n")
+    cards = "\n".join(
+        f"<section><h2>{html.escape(label)}</h2>"
+        f'<textarea id="{name}" readonly rows="3">{html.escape(value)}</textarea>'
+        f"<button onclick=\"copyText('{name}')\">Copy</button></section>"
+        for name, label, value in entries
+    )
+    page = f"""<!doctype html>
+<!-- Author:  cirakg & claude ai -->
+<!-- Summary: Settings spike test strings with copy buttons; open on the phone, copy, paste into a settings field. -->
+<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1">
+<title>Settings spike test strings</title>
+<style>body{{font-family:sans-serif;margin:16px}}textarea{{width:100%;font-family:monospace}}
+button{{font-size:1.1em;padding:6px 16px;margin:4px 0 16px}}</style></head>
+<body><h1>Settings spike test strings</h1>
+<p>Tap Copy, then paste into one of the Text fields in the app settings. Expected lengths are in each heading.</p>
+{cards}
+<script>
+function copyText(id) {{
+  const area = document.getElementById(id);
+  area.select();
+  const done = () => alert("Copied " + area.value.length + " characters");
+  if (navigator.clipboard && window.isSecureContext) {{
+    navigator.clipboard.writeText(area.value).then(done, () => {{ document.execCommand("copy"); done(); }});
+  }} else {{ document.execCommand("copy"); done(); }}
+}}
+</script></body></html>
+"""
+    (here / "index.html").write_text(page)
+    print(f"wrote {len(entries)} test strings and index.html into {here}")
+
+
+if __name__ == "__main__":
+    main()