diff --git a/data/data.json b/data/data.json
index b333175..e668bef 100644
--- a/data/data.json
+++ b/data/data.json
@@ -3,7 +3,7 @@
     "nvim": {
       "paths": [
         {
-          "internal": "config/nvim/init.vim",
+          "internal": "data/nvim/init.vim",
           "external": "~/.config/nvim/init.vim"
         }
       ]
diff --git a/go.mod b/go.mod
index 70be108..0413cff 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.16
 require (
 	github.com/cpuguy83/go-md2man/v2 v2.0.0 // indirect
 	github.com/haunt98/color v0.1.0
-	github.com/haunt98/copy-go v0.5.0
+	github.com/haunt98/copy-go v0.7.0
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/urfave/cli/v2 v2.3.0
 	golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57 // indirect
diff --git a/go.sum b/go.sum
index 2795f68..e46a45e 100644
--- a/go.sum
+++ b/go.sum
@@ -6,12 +6,14 @@ github.com/fatih/color v1.10.0 h1:s36xzo75JdqLaaWoiEHk767eHiwo0598uUxyfiPkDsg=
 github.com/fatih/color v1.10.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
 github.com/haunt98/color v0.1.0 h1:qfP5oNI3aoUC8T+bH/JNVAg79ljyhTGpgfqSKWhkiQQ=
 github.com/haunt98/color v0.1.0/go.mod h1:V4BPVUSuiOItuVZHRHUTkpxO7OYQiP0DSgIWMpC/2qs=
-github.com/haunt98/copy-go v0.5.0 h1:8yy7Dx47BBtlHIFIXxcCIECZRoQB/JSgLN9yunqtLAQ=
-github.com/haunt98/copy-go v0.5.0/go.mod h1:cK1mRlW7QXPHhe5YI1VtL/U4OjUbRLAtZnO/oucrwRI=
+github.com/haunt98/copy-go v0.7.0 h1:rmEGI3KEmtjPPDd97bPW3IsAXMfLXQoetk8I83Rf37U=
+github.com/haunt98/copy-go v0.7.0/go.mod h1:6t+cjKYf8mjMrEV+iHhNlLrqRWbiDehm4jsRBeqg+3A=
 github.com/mattn/go-colorable v0.1.8 h1:c1ghPdyEDarC70ftn0y+A/Ee++9zz8ljHG1b13eJ0s8=
 github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e h1:aoZm08cpOy4WuID//EZDgcC4zIxODThtZNPirFr42+A=
+github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
diff --git a/pkg/cli/action.go b/pkg/cli/action.go
index cc58926..08417ec 100644
--- a/pkg/cli/action.go
+++ b/pkg/cli/action.go
@@ -68,6 +68,22 @@ func (a *action) RunClean(c *cli.Context) error {
 	return nil
 }
 
+func (a *action) RunCompare(c *cli.Context) error {
+	a.getFlags(c)
+	a.log("start %s\n", compareCommand)
+
+	cfg, err := a.loadConfig()
+	if err != nil {
+		return err
+	}
+
+	if err := cfg.Compare(); err != nil {
+		return fmt.Errorf("failed to compare config: %w", err)
+	}
+
+	return nil
+}
+
 func (a *action) loadConfig() (config.Config, error) {
 	cfgReal, cfgDemo, err := config.LoadConfig(currentDir)
 	if err != nil {
diff --git a/pkg/cli/app.go b/pkg/cli/app.go
index 0fe5c1b..55201c8 100644
--- a/pkg/cli/app.go
+++ b/pkg/cli/app.go
@@ -21,22 +21,27 @@ const (
 	installCommand = "install"
 	updateCommand  = "update"
 	cleanCommand   = "clean"
+	compareCommand = "compare"
 
-	// usages
+	// flag usages
 	verboseUsage = "show what is going on"
 	dryRunUsage  = "demo mode without actually changing anything"
+
+	// command usages
 	installUsage = "install user configs from dotfiles"
 	updateUsage  = "update dotfiles from user configs"
 	cleanUsage   = "clean unused dotfiles"
+	compareUsage = "compare dotfiles with user configs"
 
 	currentDir = "."
 )
 
 var (
-	// aliases
+	// command aliases
 	installAliases = []string{"i"}
 	updateAliases  = []string{"u"}
 	cleanAliases   = []string{"c"}
+	compareAliases = []string{"cmp"}
 )
 
 // denyOSes contains OS which is not supported
@@ -104,6 +109,18 @@ func NewApp() *App {
 				},
 				Action: a.RunClean,
 			},
+			{
+				Name:    compareCommand,
+				Aliases: compareAliases,
+				Usage:   compareUsage,
+				Flags: []cli.Flag{
+					&cli.BoolFlag{
+						Name:  verboseFlag,
+						Usage: verboseUsage,
+					},
+				},
+				Action: a.RunCompare,
+			},
 		},
 		Action: a.RunHelp,
 	}
diff --git a/pkg/config/config.go b/pkg/config/config.go
index 4412123..0088ec5 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -4,4 +4,5 @@ type Config interface {
 	Install() error
 	Update() error
 	Clean() error
+	Compare() error
 }
diff --git a/pkg/config/config_demo.go b/pkg/config/config_demo.go
index 74d11bd..30c1989 100644
--- a/pkg/config/config_demo.go
+++ b/pkg/config/config_demo.go
@@ -40,3 +40,7 @@ func (cd *configDemo) Clean() error {
 
 	return nil
 }
+
+func (cd *configDemo) Compare() error {
+	return nil
+}
diff --git a/pkg/config/config_real.go b/pkg/config/config_real.go
index 80af36e..6fc9c2a 100644
--- a/pkg/config/config_real.go
+++ b/pkg/config/config_real.go
@@ -107,6 +107,18 @@ func (c *config) Clean() error {
 	return nil
 }
 
+func (c *config) Compare() error {
+	for _, app := range c.Apps {
+		for _, p := range app.Paths {
+			if err := copy.Compare(p.Internal, p.External); err != nil {
+				return fmt.Errorf("failed to compare %s with %s: %w", p.Internal, p.External, err)
+			}
+		}
+	}
+
+	return nil
+}
+
 func getConfigPath(path string) string {
 	return filepath.Join(path, configDirPath, configFile)
 }