diff --git a/bin/gitopen b/bin/gitopen
index 8168749..aab638f 100755
--- a/bin/gitopen
+++ b/bin/gitopen
@@ -12,51 +12,54 @@ var gitroot = gitremote.getGitRootPath(cwd);
 // 1. commander
 // 2. if help then print help.
 // 3. if version then print version.
-var command = commander(process.argv, {
+commander(process.argv, {
   cwd: cwd,
   cwb: cwb,
   root: gitroot,
-});
-// 4. if @profile then open @profile
-if (command.category === 'profile') {
-  var username = command.args.username;
-  var reponame = command.args.reponame;
-  var url = 'https://github.com/' + username + (reponame ? '/' + reponame : '');
-  if (command.verbose) {
-    console.log('URL:', url);
+}, function(command) {
+
+  // 4. if @profile then open @profile
+  if (command.category === 'profile') {
+    var username = command.args.username;
+    var reponame = command.args.reponame;
+    var url = 'https://github.com/' + username + (reponame ? '/' + reponame : '');
+    if (command.verbose) {
+      console.log('URL:', url);
+      process.exit(0);
+      return 0;
+    }
+    xopen(url);
     process.exit(0);
     return 0;
   }
-  xopen(url);
-  process.exit(0);
-  return 0;
-}
 
-// 5. git/hg/svn remote url.
-var uri;
-try {
-  uri = gitremote.getRemoteUrl({cwd: process.cwd()});
-} catch(ex) {
-  if (command.category === 'snippets/new') {
-    uri = 'https://github.com/hotoo/gitopen';
+  // 5. git/hg/svn remote url.
+  var uri;
+  try {
+    uri = gitremote.getRemoteUrl({cwd: process.cwd()});
+  } catch(ex) {
+    if (command.category === 'snippets/new') {
+      uri = 'https://github.com/hotoo/gitopen';
+    } else {
+      console.error('Not in git repository directory');
+      process.exit(1);
+      return 1;
+    }
+  }
+  // 6. get openrc
+  var config = getConfig(uri);
+  command.scheme = config.scheme;
+  command.protocol = config.protocol;
+  // 6. resolve paths.
+  var url = gitresolve(uri, command);
+  // 7. open
+  if (command.verbose) {
+    console.log('Option:', command);
+    console.log('URL:', url);
   } else {
-    console.error('Not in git repository directory');
-    process.exit(1);
-    return 1;
+    xopen(url);
   }
-}
-// 6. get openrc
-var config = getConfig(uri);
-command.scheme = config.scheme;
-command.protocol = config.protocol;
-// 6. resolve paths.
-var url = gitresolve(uri, command);
-// 7. open
-if (command.verbose) {
-  console.log('Option:', command);
-  console.log('URL:', url);
-} else {
-  xopen(url);
-}
+
+});
 
 // vim:ft=javascript
diff --git a/bin/hgopen b/bin/hgopen
index e812303..89d9c4a 100755
--- a/bin/hgopen
+++ b/bin/hgopen
@@ -12,40 +12,43 @@ var hgroot = hgremote.getHgRootPath(cwd);
 // 1. commander
 // 2. if help then print help.
 // 3. if version then print version.
-var command = commander(process.argv, {
+commander(process.argv, {
   cwd: cwd,
   cwb: cwb,
   root: hgroot,
-});
-// 4. if @profile then open @profile
-if (command.category === 'profile') {
-  var username = command.args.username;
-  var reponame = command.args.reponame;
-  var url = 'https://github.com/' + username + (reponame? '/'+reponame : '');
-  if (command.verbose) {
-    console.log("URL:", url);
+}, function(command) {
+
+  // 4. if @profile then open @profile
+  if (command.category === 'profile') {
+    var username = command.args.username;
+    var reponame = command.args.reponame;
+    var url = 'https://github.com/' + username + (reponame? '/'+reponame : '');
+    if (command.verbose) {
+      console.log("URL:", url);
+      process.exit(0);
+      return 0;
+    }
+    xopen(url);
     process.exit(0);
     return 0;
   }
-  xopen(url);
-  process.exit(0);
-  return 0;
-}
 
-// 5. git/hg/svn remote url.
-var uri = hgremote.getRemoteUrl({cwd:process.cwd()});
-// 6. get openrc
-var config = getConfig(uri);
-command.scheme = config.scheme;
-command.protocol = config.protocol;
-// 6. resolve paths.
-var url = gitresolve(uri, command);
-// 7. open
-if (command.verbose) {
-  console.log("Option:", command)
-  console.log("URL:", url);
-} else {
-  xopen(url);
-}
+  // 5. git/hg/svn remote url.
+  var uri = hgremote.getRemoteUrl({cwd:process.cwd()});
+  // 6. get openrc
+  var config = getConfig(uri);
+  command.scheme = config.scheme;
+  command.protocol = config.protocol;
+  // 6. resolve paths.
+  var url = gitresolve(uri, command);
+  // 7. open
+  if (command.verbose) {
+    console.log("Option:", command)
+    console.log("URL:", url);
+  } else {
+    xopen(url);
+  }
+
+});
 
 // vim:ft=javascript
diff --git a/bin/open-commander.js b/bin/open-commander.js
index eb96b1a..3b2dd1b 100644
--- a/bin/open-commander.js
+++ b/bin/open-commander.js
@@ -2,6 +2,8 @@
 var fs = require('fs');
 var path = require('path');
 var commander = require('commander');
+var child_process = require('child_process');
+var inquirer = require('inquirer');
 
 // resolve absolute path to relative path base repository root.
 function resolve(filepath, cwd, root) {
@@ -11,7 +13,7 @@ function resolve(filepath, cwd, root) {
 
 // @param {argv} process.argv
 // @param {String} cwb, current working branch name.
-module.exports = function(argv, option) {
+module.exports = function(argv, option, callback) {
 
   function parseFilePath(options, cpath) {
     try {
@@ -148,6 +150,36 @@ module.exports = function(argv, option) {
         'branch-B': commander.args[2] || option.cwb,
       };
     }
+
+    var RE_REMOTE_BRANCH_NAME = /^(\w+)\/(.+)/;
+    var cwd = commander.cwd || process.cwd();
+    var remoteBranches = child_process.execSync(
+        'git branch -r',
+        {cwd: cwd}
+      ).toString()
+      .trim()
+      .split(/\r\n|\r|\n/)
+      .map(function(branchName) { return branchName.trim(); })
+      .filter(function(branchName) {
+        return branchName.replace(RE_REMOTE_BRANCH_NAME, '$2') !== option.cwb &&
+          branchName.indexOf(' -> ') === -1; // `  origin/HEAD -> origin/master`
+      });
+
+    if (!options.args['branch-A'] && remoteBranches.length > 1) {
+      inquirer.prompt([{
+        name: 'remoteBranch',
+        type: 'list',
+        message: 'Choose remote brance to compare:',
+        choices: remoteBranches,
+      }]).then(function(answers) {
+        var br = answers.remoteBranch;
+        var m = RE_REMOTE_BRANCH_NAME.exec(br);
+        options.args['branch-A'] = m[2];
+        return callback(options);
+      });
+      return;
+    }
+
     break;
   case 'pulls':
   case 'prs':
@@ -280,5 +312,5 @@ module.exports = function(argv, option) {
     return 1;
   }
 
-  return options;
+  return callback(options);
 };
diff --git a/package.json b/package.json
index 135c8c5..f595235 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,8 @@
   "dependencies": {
     "commander": "^2.8.1",
     "deepmerge": "~0.2.10",
-    "js-yaml": "^3.3.1"
+    "js-yaml": "^3.3.1",
+    "inquirer": "^1.0.3"
   },
   "devDependencies": {
     "coveralls": "^2.11.3",
@@ -40,4 +41,4 @@
     "mocha": "^2.2.5",
     "should": "^7.0.1"
   }
-}
+}
\ No newline at end of file
diff --git a/test/gitopen.test.js b/test/gitopen.test.js
index 4666826..55f27ec 100644
--- a/test/gitopen.test.js
+++ b/test/gitopen.test.js
@@ -378,7 +378,7 @@ describe('gitremote()', function () {
 
 describe('$ cd non-git-dir && gitopen', function () {
   it('$ gitopen @hotoo', function (done) {
-    child_process.exec('cd .. && ./gitopen/bin/gitopen --verbose @hotoo', function(err, stdout) {
+    child_process.exec('./gitopen/bin/gitopen --verbose @hotoo', {cwd: '..'}, function(err, stdout) {
       should(err).not.be.ok();
       stdout.should.be.containEql('URL: https://github.com/hotoo\n');
       done();
@@ -386,7 +386,7 @@ describe('$ cd non-git-dir && gitopen', function () {
   });
 
   it('$ gitopen @hotoo/gitopen', function (done) {
-    child_process.exec('cd .. && ./gitopen/bin/gitopen --verbose @hotoo/gitopen', function(err, stdout) {
+    child_process.exec('./gitopen/bin/gitopen --verbose @hotoo/gitopen', {cwd: '..'}, function(err, stdout) {
       should(err).not.be.ok();
       stdout.should.be.containEql('URL: https://github.com/hotoo/gitopen\n');
       done();
@@ -394,7 +394,7 @@ describe('$ cd non-git-dir && gitopen', function () {
   });
 
   it('$ gitopen snippet', function (done) {
-    child_process.exec('cd .. && ./gitopen/bin/gitopen --verbose snippet', function(err, stdout) {
+    child_process.exec('./gitopen/bin/gitopen --verbose snippet', {cwd: '..'}, function(err, stdout) {
       should(err).not.be.ok();
       stdout.should.be.containEql('URL: https://gist.github.com/\n');
       done();
@@ -402,7 +402,7 @@ describe('$ cd non-git-dir && gitopen', function () {
   });
 
   it('$ gitopen #1    SHOULD ERROR', function (done) {
-    child_process.exec('cd .. && ./gitopen/bin/gitopen --verbose "#1"', function(err) {
+    child_process.exec('./gitopen/bin/gitopen --verbose "#1"', {cwd: '..'}, function(err) {
       should(err).be.ok();
       done();
     });
@@ -499,7 +499,7 @@ describe('$ gitopen', function () {
   git_command_case_in_subdir.forEach(function(testcase) {
     var cmd = testcase[0] ? ' ' + testcase[0] : '';
     it('$ cd bin && gitopen' + cmd, function (done) {
-      child_process.exec('cd bin && ./gitopen --verbose' + cmd, function(err, stdout) {
+      child_process.exec('./gitopen --verbose' + cmd, {cwd: './bin'}, function(err, stdout) {
         should(err).not.be.ok();
         stdout.should.be.containEql('URL: ' + (RE_URL.test(testcase[1]) ? testcase[1] : 'https://github.com' + testcase[1]) + '\n');
         done();
@@ -522,7 +522,7 @@ describe('$ hgopen', function () {
     hg_command_case.forEach(function(testcase) {
       var cmd = testcase[0] ? ' "' + testcase[0] + '"' : '';
       it('$ hgopen' + cmd, function (done) {
-        child_process.exec('cd test/hgssh && ../../bin/hgopen --verbose' + cmd, function(err, stdout) {
+        child_process.exec('../../bin/hgopen --verbose' + cmd, {cwd: 'test/hgssh'}, function(err, stdout) {
           should(err).not.be.ok();
           stdout.should.be.containEql('URL: ' + (RE_URL.test(testcase[1]) ? testcase[1] : 'https://bitbucket.org' + testcase[1]) + '\n');
           done();
@@ -535,7 +535,7 @@ describe('$ hgopen', function () {
     hg_command_case.forEach(function(testcase) {
       var cmd = testcase[0] ? ' "' + testcase[0] + '"' : '';
       it('$ hgopen' + cmd, function (done) {
-        child_process.exec('cd test/hghttp && ../../bin/hgopen --verbose' + cmd, function(err, stdout) {
+        child_process.exec('../../bin/hgopen --verbose' + cmd, {cwd: 'test/hghttp'}, function(err, stdout) {
           should(err).not.be.ok();
           stdout.should.be.containEql('URL: ' + (RE_URL.test(testcase[1]) ? testcase[1] : 'https://bitbucket.org' + testcase[1]) + '\n');
           done();