diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7084b0a03e..b447c5e5e7 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -408,3 +408,7 @@ jobs:
           retention-days: 7
           if-no-files-found: ignore
           include-hidden-files: true
+      - name: Compare SimpleCov results with Undercover
+        run: |
+          git fetch --no-tags origin master:master
+          bundle exec undercover
diff --git a/.undercover b/.undercover
new file mode 100644
index 0000000000..95a9fe08c9
--- /dev/null
+++ b/.undercover
@@ -0,0 +1,5 @@
+#!/bin/env ruby
+# frozen_string_literal: true
+
+-l coverage/lcov/openfoodnetwork.lcov
+-c master
\ No newline at end of file
diff --git a/Gemfile b/Gemfile
index 3eb9efa049..342f6ec61e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -173,6 +173,8 @@ group :test do
   gem 'pdf-reader'
   gem 'rails-controller-testing'
   gem 'simplecov', require: false
+  gem 'simplecov-lcov', require: false
+  gem 'undercover', require: false
   gem 'vcr', require: false
   gem 'webmock', require: false
   # See spec/spec_helper.rb for instructions
diff --git a/Gemfile.lock b/Gemfile.lock
index 37547b0258..d391606055 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -364,6 +364,8 @@ GEM
     image_processing (1.12.2)
       mini_magick (>= 4.9.5, < 5)
       ruby-vips (>= 2.0.17, < 3)
+    imagen (0.2.0)
+      parser (>= 2.5, != 2.5.1.1)
     immigrant (0.3.6)
       activerecord (>= 3.0)
     invisible_captcha (2.3.0)
@@ -715,6 +717,7 @@ GEM
     rubyzip (2.3.2)
     rufus-scheduler (3.8.2)
       fugit (~> 1.1, >= 1.1.6)
+    rugged (1.7.2)
     sanitize (6.1.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
@@ -743,6 +746,7 @@ GEM
       simplecov-html (~> 0.11)
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
+    simplecov-lcov (0.8.0)
     simplecov_json_formatter (0.1.4)
     spreadsheet_architect (5.0.0)
       caxlsx (>= 3.3.0, < 4)
@@ -804,6 +808,11 @@ GEM
       turbo-rails (>= 1.3.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
+    undercover (0.6.3)
+      bigdecimal
+      imagen (>= 0.2.0)
+      rainbow (>= 2.1, < 4.0)
+      rugged (>= 0.27, < 1.8)
     unicode-display_width (2.5.0)
     uniform_notifier (1.16.0)
     uri (0.13.0)
@@ -980,6 +989,7 @@ DEPENDENCIES
   sidekiq
   sidekiq-scheduler
   simplecov
+  simplecov-lcov
   spreadsheet_architect
   spring
   spring-commands-rspec
@@ -992,6 +1002,7 @@ DEPENDENCIES
   timecop
   turbo-rails
   turbo_power
+  undercover
   valid_email2
   validates_lengths_from_database
   vcr
diff --git a/lib/tasks/simplecov.rake b/lib/tasks/simplecov.rake
index b0c896ecb7..d5bc344f06 100644
--- a/lib/tasks/simplecov.rake
+++ b/lib/tasks/simplecov.rake
@@ -5,6 +5,7 @@ namespace :simplecov do
   task :collate_results, # rubocop:disable Rails/RakeEnvironment doesn't need the full env
        [:path_to_results, :coverage_dir] do |_t, args|
     require "simplecov"
+    require "simplecov-lcov"
 
     path_to_results = args[:path_to_results].presence || "tmp/simplecov"
     output_path = args[:coverage_dir].presence || "coverage"
@@ -13,5 +14,11 @@ namespace :simplecov do
       formatter(SimpleCov::Formatter::HTMLFormatter)
       coverage_dir(output_path)
     end
+
+    SimpleCov::Formatter::LcovFormatter.config.report_with_single_file = true
+    SimpleCov.collate Dir[File.join(path_to_results, "**", ".resultset.json")], "rails" do
+      formatter(SimpleCov::Formatter::LcovFormatter)
+      coverage_dir(output_path)
+    end
   end
 end