diff --git a/inventory.py b/inventory.py
new file mode 100644
index 0000000..955a0a2
--- /dev/null
+++ b/inventory.py
@@ -0,0 +1,117 @@
+import re
+from pathlib import Path
+from glob import glob
+from frappy_psi.calcurve import CalCurve
+
+
+lookup = '~/git', '~'
+sea_pat = re.compile(r'\s*(lsc_sensor|mom_sensor|stick_sensors)\s+(\S+)\s+(\S+)\s+(?:.*-(sensor|curve)\s)?(\S+)?')
+frappy_pat = re.compile(r'''[^#]*calcurve\s*=\s*('[^']+'|"[^"]+")''')
+
+
+def find_dir(dirpath):
+    for base in lookup:
+        result = (Path(base) / dirpath).expanduser()
+        if result.is_dir():
+            return result
+    raise ValueError(f'{dirpath} not found')
+
+
+sea_dir = find_dir('sea/tcl')
+cal_dir = find_dir('calcurves')
+frappy_cfg = find_dir('frappy/cfg')
+
+
+SPECIAL = {'raw', 'manual', 'vacuum', 'code', 'clone', 'undefined', '-sensorname'}
+STD = set(Path(p).name.replace('.std', '') for p in glob(str(cal_dir / '*.std')))
+FAKECRV = STD | SPECIAL
+
+OPT = {'lsc_sensor': ' -sensor ', 'mom_sensor': '-curve '}
+
+moms = {}
+
+
+class Collector:
+    def __init__(self):
+        self.result = {}
+
+    def lsc_sensor(self, file, _1, _2, kwd, calcurve):
+        if calcurve not in SPECIAL and kwd in (None, 'sensor'):
+            self.result.setdefault(calcurve, []).append(file)
+
+    def mom_sensor(self, file, _1, _2, kwd, calcurve):
+        if calcurve not in FAKECRV and kwd == 'curve':
+            self.result.setdefault(calcurve, []).append(file)
+
+    def stick_sensors(self, file, calcurve1, calcurve2, _3, _4):
+        for calcurve in (calcurve1, calcurve2):
+            if calcurve.startswith('code=') or calcurve in SPECIAL:
+                continue
+            self.result.setdefault(calcurve, []).append(Path(file).name)
+
+    def collect_sea(self, pattern):
+        """treat lines starting with lsc_sensor, mom_sensor and stick_sensors"""
+        for file in glob(str(sea_dir / pattern)):
+            with open(file) as f:
+                for line in f:
+                    match = sea_pat.match(line)
+                    if match:
+                        getattr(self, match.group(1), None)(file, *match.groups()[1:])
+
+    def collect_frappy(self, pattern):
+        """treat lines containing 'calcurve = "<sensor>"
+        also single quote is allowed, and no hash before
+        """
+        for file in glob(str(frappy_cfg / pattern)):
+            with open(file) as f:
+                for line in f:
+                    match = frappy_pat.match(line)
+                    if match:
+                        calcurve = match.group(1)[1:-1]
+                        self.result.setdefault(calcurve, []).append(file)
+
+
+col = Collector()
+
+col.collect_sea('*.config')
+col.collect_sea('*.stick')
+col.collect_sea('*.addon')
+col.collect_frappy('*.py')
+col.collect_frappy('*/*.py')
+
+all_calibs = {Path(f).stem.lower(): f for f in glob(str(cal_dir / '*.*'))}
+unused = dict(all_calibs)
+
+found = {}
+notfound = {}
+
+for calib, files in col.result.items():
+    file = all_calibs.get(calib.lower())
+    if file:
+        unused.pop(calib.lower(), None)
+        found[calib] = (file, files)
+    else:
+        notfound[calib] = files
+
+
+print('\n--- found:')
+for calib, (file, files) in found.items():
+    if calib in STD:
+        continue
+    try:
+        CalCurve(calib)
+        head = f'{Path(file).name}:'
+    except Exception as e:
+        head = f'{Path(file).name} {e!r}:'
+    print(head, ' '.join(Path(p).name for p in files))
+
+if notfound:
+    print('\n--- not found:')
+    for calib, files in notfound.items():
+        print(f'{calib}:', ' '.join(Path(p).name for p in files))
+
+print('\n--- unused:')
+print(' '.join(Path(p).name for p in unused.values()))
+
+print('\nfound', len(found), 'notfound', len(notfound), 'unused', len(unused))
+