diff --git a/olaflow/processing/sws_wavedict.py b/olaflow/processing/sws_wavedict.py
new file mode 100644
index 0000000..c3c758b
--- /dev/null
+++ b/olaflow/processing/sws_wavedict.py
@@ -0,0 +1,46 @@
+import argparse
+import configparser
+import logging
+import pathlib
+
+import matplotlib.pyplot as plt
+import numpy as np
+from scipy import interpolate
+from scipy import fft
+
+from .olaflow import OFModel
+
+parser = argparse.ArgumentParser(description="Convert swash output to olaFlow input")
+parser.add_argument("-v", "--verbose", action="count", default=0)
+parser.add_argument("-c", "--config", default="config.ini")
+args = parser.parse_args()
+
+logging.basicConfig(level=max((10, 20 - 10 * args.verbose)))
+log = logging.getLogger("sws_ola")
+
+log.info("Starting sws -> olaFlow converter")
+config = configparser.ConfigParser()
+config.read(args.config)
+
+sws_out = pathlib.Path(config.get("swash", "np_out"))
+
+
+def data(var):
+    return np.load(sws_out.joinpath(f"{var}.npy"))
+
+
+x = data("x")
+t = data("t")
+
+watl = data("watl")
+
+arg_x0 = np.argmin(np.abs(x+1250))
+
+wl = watl[:, arg_x0]
+
+f = fft.rfftfreq(t.size, np.diff(t).mean())
+w_fft = fft.rfft(wl)
+amp = np.abs(w_fft)
+phi = np.angle(w_fft)
+
+print(f, amp, phi, sep="\n")