diff --git a/__snapshots__/bump-spec.js b/__snapshots__/bump-spec.js
new file mode 100644
index 0000000000..6158c9de68
--- /dev/null
+++ b/__snapshots__/bump-spec.js
@@ -0,0 +1,65 @@
+exports['list of all projects'] = [
+  {
+    "repo": "cypress-io/cypress-test-tiny",
+    "provider": "appVeyor",
+    "platform": "win32"
+  },
+  {
+    "repo": "cypress-io/cypress-test-example-repos",
+    "provider": "appVeyor",
+    "platform": "win32"
+  },
+  {
+    "repo": "cypress-io/cypress-test-tiny",
+    "provider": "circle",
+    "platform": "linux"
+  },
+  {
+    "repo": "cypress-io/cypress-test-module-api",
+    "provider": "circle",
+    "platform": "linux"
+  },
+  {
+    "repo": "cypress-io/cypress-test-node-versions",
+    "provider": "circle",
+    "platform": "linux"
+  },
+  {
+    "repo": "cypress-io/cypress-test-nested-projects",
+    "provider": "circle",
+    "platform": "linux"
+  },
+  {
+    "repo": "cypress-io/cypress-test-ci-environments",
+    "provider": "circle",
+    "platform": "linux"
+  },
+  {
+    "repo": "cypress-io/cypress-test-example-repos",
+    "provider": "circle",
+    "platform": "linux"
+  },
+  {
+    "repo": "cypress-io/cypress-test-tiny",
+    "provider": "circle",
+    "platform": "darwin"
+  },
+  {
+    "repo": "cypress-io/cypress-test-example-repos",
+    "provider": "circle",
+    "platform": "darwin"
+  }
+]
+
+exports['should have just circle and darwin projects'] = [
+  {
+    "repo": "cypress-io/cypress-test-tiny",
+    "provider": "circle",
+    "platform": "darwin"
+  },
+  {
+    "repo": "cypress-io/cypress-test-example-repos",
+    "provider": "circle",
+    "platform": "darwin"
+  }
+]
diff --git a/circle.yml b/circle.yml
index 9b06a73619..37536e6784 100644
--- a/circle.yml
+++ b/circle.yml
@@ -855,6 +855,7 @@ mac-workflow: &mac-workflow
           branches:
             only:
               - develop
+              - test-example-repos-on-mac-4526
         requires:
           - Mac build
 
@@ -867,6 +868,7 @@ mac-workflow: &mac-workflow
             only:
               - develop
               - binary-metadata
+              - test-example-repos-on-mac-4526
         requires:
           - Mac build
 
@@ -891,6 +893,19 @@ mac-workflow: &mac-workflow
         requires:
           - Mac NPM package
           - Mac binary
+
+    - test-binary-and-npm-against-other-projects:
+        name: Test Mac binary against other projects
+        executor: mac
+        filters:
+          branches:
+            only:
+              - develop
+              - test-example-repos-on-mac-4526
+        requires:
+          - Mac NPM package
+          - Mac binary
+
 workflows:
   linux:
     <<: *linux-workflow
diff --git a/scripts/binary/bump.coffee b/scripts/binary/bump.coffee
index 89912f53dd..d4fb94f40c 100644
--- a/scripts/binary/bump.coffee
+++ b/scripts/binary/bump.coffee
@@ -21,7 +21,7 @@ car = null
 _PROVIDERS = {
   appVeyor: {
     main: "cypress-io/cypress"
-    others: [
+    win32: [
       "cypress-io/cypress-test-tiny"
       "cypress-io/cypress-test-example-repos"
     ]
@@ -29,7 +29,7 @@ _PROVIDERS = {
 
   circle: {
     main: "cypress-io/cypress"
-    others: [
+    linux: [
       "cypress-io/cypress-test-tiny"
       "cypress-io/cypress-test-module-api"
       "cypress-io/cypress-test-node-versions"
@@ -37,6 +37,10 @@ _PROVIDERS = {
       "cypress-io/cypress-test-ci-environments"
       "cypress-io/cypress-test-example-repos"
     ]
+    darwin: [
+      "cypress-io/cypress-test-tiny"
+      "cypress-io/cypress-test-example-repos"
+    ]
   }
 }
 
@@ -44,11 +48,17 @@ remapProjects = (projectsByProvider) ->
   list = []
 
   _.mapValues projectsByProvider, (provider, name) ->
-    provider.others.forEach (repo) ->
-      list.push({
-        repo
-        provider: name
-      })
+    remapPlatform = (platform, repos) ->
+      repos.forEach (repo) ->
+        list.push({
+          repo
+          provider: name
+          platform
+        })
+
+    if provider.win32 then remapPlatform("win32", provider.win32)
+    if provider.linux then remapPlatform("linux", provider.linux)
+    if provider.darwin then remapPlatform("darwin", provider.darwin)
 
   list
 
@@ -64,7 +74,7 @@ remapMain = (projectsByProvider) ->
   list
 
 # make flat list of objects
-# {repo, provider}
+# {repo, provider, platform}
 PROJECTS = remapProjects(_PROVIDERS)
 
 getCiConfig = ->
@@ -115,15 +125,30 @@ awaitEachProjectAndProvider = (projects, fn, filter = R.identity) ->
 
 # do not trigger all projects if there is specific provider
 # for example appVeyor should be used for Windows testing
-getFilterByProvider = (providerName) ->
+getFilterByProvider = (providerName, platformName) ->
   if providerName
     console.log("only allow projects for provider", providerName)
-    projectFilter = R.propEq("provider", providerName)
+    providerFilter = R.propEq("provider", providerName)
   else
-    projectFilter = R.identity
+    providerFilter = R.identity
+
+  if platformName
+    console.log("only allow projects for platform", platformName)
+    platformFilter = R.propEq("platform", platformName)
+  else
+    platformFilter = R.identity
+
+  # combined filter is when both filters pass
+  projectFilter = R.allPass([providerFilter, platformFilter])
   projectFilter
 
 module.exports = {
+  _PROVIDERS,
+
+  remapProjects,
+
+  getFilterByProvider,
+
   nextVersion: (version) ->
     MAIN_PROJECTS = remapMain(_PROVIDERS)
     console.log("Setting next version to build", version)
@@ -175,9 +200,9 @@ module.exports = {
   # triggers test projects on multiple CIs
   # the test projects will exercise the new version of
   # the Cypress test runner we just built
-  runTestProjects: (getStatusAndMessage, providerName, version) ->
+  runTestProjects: (getStatusAndMessage, providerName, version, platform) ->
 
-    projectFilter = getFilterByProvider(providerName)
+    projectFilter = getFilterByProvider(providerName, platform)
 
     makeCommit = (project, provider, creds) ->
       ## make empty commit to trigger CIs
diff --git a/scripts/test-other-projects.js b/scripts/test-other-projects.js
index 3a4ddfa7dc..90d4bc323c 100644
--- a/scripts/test-other-projects.js
+++ b/scripts/test-other-projects.js
@@ -158,5 +158,5 @@ const onError = (e) => {
 }
 
 bump
-.runTestProjects(getStatusAndMessage, cliOptions.provider, shortNpmVersion)
+.runTestProjects(getStatusAndMessage, cliOptions.provider, shortNpmVersion, platform)
 .catch(onError)
diff --git a/scripts/unit/binary/bump-spec.js b/scripts/unit/binary/bump-spec.js
new file mode 100644
index 0000000000..0e284f14e4
--- /dev/null
+++ b/scripts/unit/binary/bump-spec.js
@@ -0,0 +1,47 @@
+const la = require('lazy-ass')
+const snapshot = require('snap-shot-it')
+const R = require('ramda')
+const bump = require('../../binary/bump')
+
+/* eslint-env mocha */
+describe('bump', () => {
+  context('remapProjects', () => {
+    it('returns flat list of projects', () => {
+      la(bump._PROVIDERS, 'has _PROVIDERS', bump)
+      const list = bump.remapProjects(bump._PROVIDERS)
+
+      snapshot('list of all projects', list)
+    })
+  })
+
+  context('getFilterByProvider', () => {
+    it('returns a filter function without provider name', () => {
+      const projects = bump.remapProjects(bump._PROVIDERS)
+      const filter = bump.getFilterByProvider()
+      // should return ALL projects
+      const filtered = R.filter(filter, projects)
+
+      la(
+        R.equals(filtered, projects),
+        'should have kept all projects',
+        filtered
+      )
+    })
+
+    it('returns a filter function for circle and darwin', () => {
+      const projects = bump.remapProjects(bump._PROVIDERS)
+
+      la(
+        projects.length,
+        'there should be at least a few projects in the list of projects',
+        projects
+      )
+
+      const filter = bump.getFilterByProvider('circle', 'darwin')
+      const filtered = R.filter(filter, projects)
+
+      la(filtered.length, 'there should be at least a few projects', filtered)
+      snapshot('should have just circle and darwin projects', filtered)
+    })
+  })
+})