diff --git a/scripts/live_royfit.jl b/scripts/live_royfit.jl
new file mode 100755
index 0000000000000000000000000000000000000000..2e9ec386005d655f52cf1953bf08f455a926e494
--- /dev/null
+++ b/scripts/live_royfit.jl
@@ -0,0 +1,78 @@
+#!/usr/bin/env julia
+using KM3NeT
+using Plots
+using PlotThemes
+using Dates
+using Measures
+GR.inline("png")
+
+if length(ARGS) < 2
+    println("Usage: ./live_royfit.jl DETX TIME_RES")
+    exit(1)
+end
+
+
+const calib = KM3NeT.read_calibration(ARGS[1])
+const TIME_RES = ARGS[2]
+
+function main()
+    println("Starting live ROyFit")
+
+    for message in CHClient(ip"127.0.0.1", 55530, ["IO_EVT"])
+        event = KM3NeT.read_io(IOBuffer(message.data), KM3NeT.DAQEvent)
+
+        hits = calibrate(event.hits, calib)
+        triggered_hits = filter(h->h.triggered, hits)
+        dus = sort(unique(map(h->h.du, hits)))
+        n_dus = length(dus)
+        n_doms = length(unique(h->h.dom_id, triggered_hits))
+
+        if n_doms < 4
+            continue
+        end
+
+        colours = palette(:default)
+        plot()
+        Q = []
+        for (idx, du) in enumerate(dus)
+            du_hits = filter(h->h.du == du, hits)
+            if length(triggered(du_hits))== 0
+                println("No triggered hits")
+                continue
+            end
+            fit = KM3NeT.single_du_fit(du_hits)
+            push!(Q, fit.Q)
+            plot!(du_hits, fit, markercolor=colours[idx], label="DU $(du)", max_z=calib.max_z)
+            write_time_residuals(TIME_RES, event, hits, fit)
+        end
+        if sum(Q) < 200 && n_doms > 12 && n_dus > 1
+            println("Plotting...")
+            fit_params = "ROy live reconstruction (combined single line): Q=$([round(_Q,digits=2) for _Q in Q])"
+            event_params = "Det ID $(event.det_id), Run $(event.run_id), FrameIndex $(event.timeslice_id), TriggerCounter $(event.trigger_counter), Overlays $(event.overlays)"
+            time_params = "$(unix2datetime(event.timestamp)) UTC"
+            trigger_params = "Trigger: $(is_mxshower(event) ? "MX " : "")$(is_3dmuon(event) ? "3DM " : "")$(is_3dshower(event) ? "3DS " : "")"
+            time_params = "$(unix2datetime(event.timestamp)) UTC"
+
+            plot!(title="$(fit_params)\n$(event_params), $(trigger_params)\n$(time_params)", titlefontsize=8, margin=5mm)
+
+            savefig("ztplot.png")
+        end
+    end
+end
+
+function write_time_residuals(filename, event, hits, fit)
+    if !isfile(filename)
+        fobj = open(filename, "w")
+        write(fobj, "run,timestamp,du,floor,dom_id,t_res,Q\n")
+    else
+        fobj = open(filename, "a")
+    end
+    dγ, ccalc = KM3NeT.make_cherenkov_calculator(fit.sdp)
+    for hit in hits
+        Δt = hit.t - ccalc(hit.pos.z)
+        write(fobj, "$(event.run_id),$(event.timestamp),$(hit.du),$(hit.floor),$(hit.dom_id),$(Δt),$(fit.Q)\n")
+    end
+    close(fobj)
+end
+
+main()