diff --git a/ethereal/assets/debugger/debugger.qml b/ethereal/assets/debugger/debugger.qml
index f204647c8e..4d01ea1837 100644
--- a/ethereal/assets/debugger/debugger.qml
+++ b/ethereal/assets/debugger/debugger.qml
@@ -116,7 +116,7 @@ ApplicationWindow {
 							id: compileTimer
 							interval: 500 ; running: true ;  repeat: true
 							onTriggered: {
-								dbg.compile(codeEditor.text)
+								dbg.autoComp(codeEditor.text)
 							}
 						}
 					}
diff --git a/ethereal/debugger.go b/ethereal/debugger.go
index 64ca316f86..997c2e8dd2 100644
--- a/ethereal/debugger.go
+++ b/ethereal/debugger.go
@@ -74,6 +74,13 @@ func (self *DebuggerWindow) Compile(code string) {
 	}
 }
 
+// Used by QML
+func (self *DebuggerWindow) AutoComp(code string) {
+	if self.Db.done {
+		self.Compile(code)
+	}
+}
+
 func (self *DebuggerWindow) ClearLog() {
 	self.win.Root().Call("clearLog")
 }
@@ -110,8 +117,6 @@ func (self *DebuggerWindow) Debug(valueStr, gasStr, gasPriceStr, scriptStr, data
 		return
 	}
 
-	self.SetAsm(script)
-
 	var (
 		gas      = ethutil.Big(gasStr)
 		gasPrice = ethutil.Big(gasPriceStr)
@@ -257,6 +262,10 @@ func (self *Debugger) StepHook(pc int, op ethchain.OpCode, mem *ethchain.Memory,
 	return self.halting(pc, op, mem, stack, stateObject)
 }
 
+func (self *Debugger) SetCode(byteCode []byte) {
+	self.main.SetAsm(byteCode)
+}
+
 func (self *Debugger) BreakPoints() []int64 {
 	return self.breakPoints
 }
diff --git a/ethereum/flags.go b/ethereum/flags.go
index d5a9c3a8a0..af0fd9a698 100644
--- a/ethereum/flags.go
+++ b/ethereum/flags.go
@@ -11,6 +11,7 @@ import (
 
 var Identifier string
 var KeyRing string
+var DiffTool bool
 var KeyStore string
 var StartRpc bool
 var RpcPort int
@@ -66,6 +67,7 @@ func Init() {
 	flag.StringVar(&ConfigFile, "conf", defaultConfigFile, "config file")
 	flag.StringVar(&DebugFile, "debug", "", "debug file (no debugging if not set)")
 	flag.IntVar(&LogLevel, "loglevel", int(ethlog.InfoLevel), "loglevel: 0-5: silent,error,warn,info,debug,debug detail)")
+	flag.BoolVar(&DiffTool, "difftool", false, "creates output for diff'ing. Sets LogLevel=0")
 
 	flag.BoolVar(&StartMining, "mine", false, "start dagger mining")
 	flag.BoolVar(&StartJsConsole, "js", false, "launches javascript console")
diff --git a/ethereum/main.go b/ethereum/main.go
index e4d73d4942..39226c1d2b 100644
--- a/ethereum/main.go
+++ b/ethereum/main.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"github.com/ethereum/eth-go/ethlog"
+	"github.com/ethereum/eth-go/ethutil"
 	"github.com/ethereum/go-ethereum/utils"
 	"runtime"
 )
@@ -20,7 +21,14 @@ func main() {
 
 	// precedence: code-internal flag default < config file < environment variables < command line
 	Init() // parsing command line
+
+	// If the difftool option is selected ignore all other log output
+	if DiffTool {
+		LogLevel = 0
+	}
+
 	utils.InitConfig(ConfigFile, Datadir, "ETH")
+	ethutil.Config.Diff = DiffTool
 
 	utils.InitDataDir(Datadir)