diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..485dee6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.idea
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..880614b
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,12 @@
+module switch/nsp/diff
+
+go 1.12
+
+require (
+	github.com/briandowns/spinner v1.6.1
+	github.com/go-openapi/strfmt v0.19.2 // indirect
+	github.com/jedib0t/go-pretty v4.3.0+incompatible
+	github.com/mattn/go-runewidth v0.0.2 // indirect
+	github.com/stretchr/testify v1.4.0 // indirect
+	golang.org/x/sys v0.0.0-20190904154756-749cb33beabd // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..fcfc3a9
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,47 @@
+github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a h1:idn718Q4B6AGu/h5Sxe66HYVdqdGu2l9Iebqhi/AEoA=
+github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
+github.com/briandowns/spinner v1.6.1 h1:LBxHu5WLyVuVEtTD72xegiC7QJGx598LBpo3ywKTapA=
+github.com/briandowns/spinner v1.6.1/go.mod h1://Zf9tMcxfRUA36V23M6YGEAv+kECGfvpnLTnb8n4XQ=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
+github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
+github.com/go-openapi/errors v0.19.2 h1:a2kIyV3w+OS3S97zxUndRVD46+FhGOUBDFY7nmu4CsY=
+github.com/go-openapi/errors v0.19.2/go.mod h1:qX0BLWsyaKfvhluLejVpVNwNRdXZhEbTA4kxxpKBC94=
+github.com/go-openapi/strfmt v0.19.2 h1:clPGfBnJohokno0e+d7hs6Yocrzjlgz6EsQSDncCRnE=
+github.com/go-openapi/strfmt v0.19.2/go.mod h1:0yX7dbo8mKIvc3XSKp7MNfxw4JytCfCD6+bY1AVL9LU=
+github.com/go-stack/stack v1.8.0 h1:5SgMzNM5HxrEjV0ww2lTmX6E2Izsfxas4+YHWRs3Lsk=
+github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
+github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
+github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
+github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+github.com/jedib0t/go-pretty v4.3.0+incompatible h1:CGs8AVhEKg/n9YbUenWmNStRW2PHJzaeDodcfvRAbIo=
+github.com/jedib0t/go-pretty v4.3.0+incompatible/go.mod h1:XemHduiw8R651AF9Pt4FwCTKeG3oo7hrHJAoznj9nag=
+github.com/mattn/go-colorable v0.1.2 h1:/bC9yWikZXAL9uJdulbSfyVNIR3n3trXl+v8+1sx8mU=
+github.com/mattn/go-colorable v0.1.2/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-isatty v0.0.8 h1:HLtExJ+uU2HOZ+wI0Tt5DtUDrx8yhUqDcp7fYERX4CE=
+github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-runewidth v0.0.2 h1:UnlwIPBGaTZfPQ6T1IGzPI0EkYAQmT9fAEJ/poFC63o=
+github.com/mattn/go-runewidth v0.0.2/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
+github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
+github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.2.0/go.mod h1:qt09Ya8vawLte6SNmTgCsAVtYtaKzEcn8ATUoHMkEqE=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/tidwall/pretty v1.0.0 h1:HsD+QiTn7sK6flMKIvNmpqz1qrpP3Ps6jOKIKMooyg4=
+github.com/tidwall/pretty v1.0.0/go.mod h1:XNkn88O1ChpSDQmQeStsy+sBenx6DDtFZJxhVysOjyk=
+go.mongodb.org/mongo-driver v1.0.3 h1:GKoji1ld3tw2aC+GX1wbr/J2fX13yNacEYoJ8Nhr0yU=
+go.mongodb.org/mongo-driver v1.0.3/go.mod h1:u7ryQJ+DOzQmeO7zB6MHyr8jkEQvC8vH7qLUO4lqsUM=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190904154756-749cb33beabd h1:DBH9mDw0zluJT/R+nGuV3jWFWLFaHyYZWD4tOT+cjn0=
+golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..cc45150
--- /dev/null
+++ b/main.go
@@ -0,0 +1,213 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"flag"
+	"fmt"
+	"github.com/briandowns/spinner"
+	"github.com/jedib0t/go-pretty/table"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const (
+	titles_json_uri   = "https://raw.githubusercontent.com/blawar/titledb/master/titles.US.en.json"
+	versions_json_url = "https://raw.githubusercontent.com/blawar/titledb/master/versions.json"
+)
+
+var (
+	nspFolder = flag.String("f", "", "path to NSP folder")
+	s         = spinner.New(spinner.CharSets[26], 100*time.Millisecond) // Build our new spinner
+)
+
+type title struct {
+	Id          string      `json:"id"`
+	Name        string      `json:"name,omitempty"`
+	Version     json.Number `json:"version,omitempty"`
+	Region      string      `json:"region,omitempty"`
+	ReleaseDate int         `json:"releaseDate,omitempty"`
+	Publisher   string      `json:"publisher,omitempty"`
+	IconUrl     string      `json:"iconUrl,omitempty"`
+	Screenshots []string    `json:"screenshots,omitempty"`
+	BannerUrl   string      `json:"bannerUrl,omitempty"`
+	Description string      `json:"description,omitempty"`
+	Size        int         `json:"size,omitempty"`
+}
+
+func main() {
+	flag.Parse()
+
+	if *nspFolder == "" {
+		flag.Usage()
+		os.Exit(1)
+	}
+
+	var titlesDb = map[string]title{}
+	err := loadOrDownloadFileFromUrl(titles_json_uri, "titlesDb.json", &titlesDb)
+	if err != nil {
+		fmt.Printf("unable to download file - %v\n%v", titles_json_uri, err)
+		return
+	}
+
+	var versionsDb = map[string]map[int]string{}
+	err = loadOrDownloadFileFromUrl(versions_json_url, "versionsDb.json", &versionsDb)
+	if err != nil {
+		fmt.Printf("unable to download file - %v\n%v", versions_json_url, err)
+		return
+	}
+
+	s.Restart()
+	fmt.Printf("\nScanning nsp folder ")
+	files, err := ioutil.ReadDir(*nspFolder)
+	if err != nil {
+		fmt.Printf("\nfailed scanning NSP folder\n %v", err)
+		return
+	}
+	s.Stop()
+	var localVersionsDb = map[string][]int{}
+	var skippedFiles = map[string]string{}
+
+	versionR := regexp.MustCompile(`\[[vV]?(?P<version>[0-9]{1,10})\]`)
+	titleIdR := regexp.MustCompile(`\[(?P<titleId>[A-Z,a-z,0-9]{16})\]`)
+	for _, file := range files {
+		if file.Name()[0:1] == "." || file.IsDir() {
+			continue
+		}
+
+		if !strings.HasSuffix(file.Name(), "nsp") {
+			skippedFiles[file.Name()] = "non NSP file"
+			continue
+		}
+
+		res := versionR.FindStringSubmatch(file.Name())
+		if len(res) != 2 {
+			skippedFiles[file.Name()] = "failed to parse name"
+			continue
+		}
+		verStr := res[1]
+		res = titleIdR.FindStringSubmatch(file.Name())
+		if len(res) != 2 {
+			skippedFiles[file.Name()] = "failed to parse name"
+			continue
+		}
+		if len(res) != 2 {
+			skippedFiles[file.Name()] = "failed to parse name"
+			continue
+		}
+		titleId := strings.ToLower(res[1])
+
+		if strings.HasSuffix(titleId, "800") {
+			titleId = titleId[0:len(titleId)-3] + "000"
+		}
+
+		ver, err := strconv.Atoi(verStr)
+		if err != nil {
+			skippedFiles[file.Name()] = "failed to parse version"
+			continue
+		}
+
+		localVersionsDb[titleId] = append(localVersionsDb[titleId], ver)
+	}
+
+	var numTobeUpdated int = 0
+
+	t := table.NewWriter()
+	t.SetOutputMirror(os.Stdout)
+	t.SetStyle(table.StyleColoredBright)
+	t.AppendHeader(table.Row{"#", "Title","TitleId" ,"Current version", "Available Version", "Release date"})
+	//iterate over local files, and compare to remote versions
+	for titleId, _ := range localVersionsDb {
+
+		localVersions := localVersionsDb[titleId]
+		sort.Ints(localVersions)
+
+		var remoteVersions []int
+		for k, _ := range versionsDb[titleId] {
+			remoteVersions = append(remoteVersions, k)
+		}
+
+		if title, ok := titlesDb[strings.ToUpper(titleId[0:len(titleId)-3]+"800")]; ok {
+			ver, err := strconv.Atoi(title.Version.String())
+			if err == nil {
+				remoteVersions = append(remoteVersions, ver)
+			}
+		}
+		if len(remoteVersions) == 0 {
+			continue
+		}
+
+		var nspName string
+		if title, ok := titlesDb[strings.ToUpper(titleId)]; ok {
+			nspName = title.Name
+			ver, err := strconv.Atoi(title.Version.String())
+			if err == nil {
+				remoteVersions = append(remoteVersions, ver)
+			}
+		}
+
+		localVer := localVersions[len(localVersions)-1]
+		if localVersions[0] != 0 && !strings.Contains(strings.ToLower(nspName), "pack") {
+			//fmt.Printf("** game [%v][%v] missing base version\n",titleId,nspName)
+			continue
+		}
+		sort.Ints(remoteVersions)
+		remoteVer := remoteVersions[len(remoteVersions)-1]
+
+		if remoteVer > localVer {
+			var nspName string
+			if title, ok := titlesDb[strings.ToUpper(titleId)]; ok {
+				nspName = title.Name
+			}
+			numTobeUpdated++
+			t.AppendRow([]interface{}{numTobeUpdated, nspName,titleId, localVer, remoteVer, versionsDb[titleId][remoteVer]})
+		}
+	}
+	t.AppendFooter(table.Row{"", "", "", "","Total", numTobeUpdated})
+	if numTobeUpdated != 0{
+		fmt.Printf("\nFound available updates:\n\n")
+		t.Render()
+	}else{
+		fmt.Printf("\nAll NSP's are up to date!\n\n")
+	}
+
+
+}
+
+func loadOrDownloadFileFromUrl(url string, fileName string, target interface{}) error {
+
+	if _, err := os.Stat("./" + fileName); os.IsNotExist(err) {
+		file, err := os.Create("./" + fileName)
+		fmt.Printf("\nDownloading from - %v", url)
+		s.Start()
+		resp, err := http.Get(url)
+		if err != nil {
+			return err
+		}
+		if resp.StatusCode != 200 {
+			return errors.New("got a non 200 response - " + resp.Status)
+		}
+		defer resp.Body.Close()
+
+		_, err = io.Copy(file, resp.Body)
+		if err != nil {
+			return err
+		}
+	}
+
+	fmt.Printf("\nLoading file - %v", fileName)
+	s.Start()
+	file, err := os.Open("./" + fileName)
+	err = json.NewDecoder(file).Decode(target)
+	if err != nil {
+		return err
+	}
+	return nil
+}