diff --git a/.codecov.yml b/.codecov.yml
new file mode 100644
index 000000000..84a6808a2
--- /dev/null
+++ b/.codecov.yml
@@ -0,0 +1,11 @@
+comment:
+  layout: "reach, diff, flags, files"
+  behavior: default
+  require_changes: false  # if true: only post the comment if coverage changes
+  require_base: no        # [yes :: must have a base report to post]
+  require_head: yes       # [yes :: must have a head report to post]
+  branches: null          # branch names that can post comment
+coverage:
+  status:
+    project: off
+    patch: off
diff --git a/.coveralls.yml b/.coveralls.yml
deleted file mode 100644
index 333dc951d..000000000
--- a/.coveralls.yml
+++ /dev/null
@@ -1,2 +0,0 @@
-service_name: travis-ci
-repo_token: REPO_TOKEN
diff --git a/.gitignore b/.gitignore
index f97bae752..e85bb8860 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,7 +20,7 @@
 log/
 tmp/*
 tmp/**/*
-coverage*
+coverage/
 public/warpables/*
 public/system/*
 public/warps/*
@@ -41,4 +41,5 @@ public/lib
 node_modules
 todo.txt
 .sass-cache
-.byebug_history
\ No newline at end of file
+.byebug_history
+coverage_report/
diff --git a/.rubocop.yml b/.rubocop.yml
index 858284ac5..920745d01 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -121,3 +121,6 @@ Layout:
 # Use my_method(my_arg) not my_method( my_arg ) or my_method my_arg.
 Lint/RequireParentheses:
   Enabled: true
+
+Metrics/LineLength:
+  Max: 100
diff --git a/.simplecov b/.simplecov
new file mode 100644
index 000000000..2bd5dffa0
--- /dev/null
+++ b/.simplecov
@@ -0,0 +1,14 @@
+require 'simplecov-cobertura'
+
+if ENV['CI'] == 'true'
+  SimpleCov.formatter = SimpleCov::Formatter::CoberturaFormatter
+else
+  SimpleCov.formatter = SimpleCov::Formatter::HTMLFormatter
+end
+
+SimpleCov.start 'rails' do
+  add_filter '/test/'
+  add_filter '/db/'
+  add_filter '/log/'
+  add_filter '/tmp/'
+end
diff --git a/.travis.yml b/.travis.yml
old mode 100644
new mode 100755
index 39d0a5759..f5e97b730
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,10 +12,10 @@ install:
   - docker-compose exec web bash -l -c "rake db:setup || rake db:migrate"
 
 script:
-  - sed -ri "s/REPO_TOKEN/$REPO_TOKEN/" .coveralls.yml
   - docker-compose exec web bash -l -c "CI=true TRAVIS=true rake test:all"
+  - bash <(curl -s https://codecov.io/bash)
 
 branches:
-   only:
+  only:
     - main
     - unstable
diff --git a/Gemfile b/Gemfile
index 8e5430c20..65f17d66e 100644
--- a/Gemfile
+++ b/Gemfile
@@ -19,7 +19,6 @@ group :dependencies do
   gem "ruby-openid", "~>2.5"
   gem "open_id_authentication"
   gem "RubyInline"
-  gem "coveralls", require: false
   gem "paperclip", "~>4.3.7"
 
   # if you use amazon s3 for warpable image storage
@@ -40,8 +39,10 @@ group :dependencies do
 end
 
 group :test do
-  gem 'test-unit'
   gem "rubocop"
+  gem 'simplecov', require: false
+  gem 'simplecov-cobertura', require: false
+  gem 'test-unit'    
 end
 
 group :development do
diff --git a/Gemfile.lock b/Gemfile.lock
index 4289884bb..6e2e74569 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -45,12 +45,6 @@ GEM
     cocaine (0.5.8)
       climate_control (>= 0.0.3, < 1.0)
     concurrent-ruby (1.1.5)
-    coveralls (0.8.22)
-      json (>= 1.8, < 3)
-      simplecov (~> 0.16.1)
-      term-ansicolor (~> 1.3)
-      thor (~> 0.19.4)
-      tins (~> 1.6)
     docile (1.3.1)
     erubis (2.7.0)
     execjs (2.7.0)
@@ -154,6 +148,8 @@ GEM
       docile (~> 1.1)
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
+    simplecov-cobertura (1.3.1)
+      simplecov (~> 0.8)
     simplecov-html (0.10.2)
     sprockets (2.2.3)
       hike (~> 1.2)
@@ -161,8 +157,6 @@ GEM
       rack (~> 1.0)
       tilt (~> 1.1, != 1.3.0)
     sqlite3 (1.4.0)
-    term-ansicolor (1.7.1)
-      tins (~> 1.0)
     test-unit (3.3.2)
       power_assert
     therubyracer (0.12.3)
@@ -170,7 +164,6 @@ GEM
       ref
     thor (0.19.4)
     tilt (1.4.1)
-    tins (1.20.2)
     treetop (1.4.15)
       polyglot
       polyglot (>= 0.3.1)
@@ -190,7 +183,6 @@ DEPENDENCIES
   autoprefixer-rails
   aws-sdk (~> 1.5.7)
   byebug
-  coveralls
   friendly_id
   geokit-rails (= 1.1.4)
   image_science (= 1.2.6)
@@ -208,6 +200,8 @@ DEPENDENCIES
   right_aws
   ruby-openid (~> 2.5)
   sass
+  simplecov
+  simplecov-cobertura
   sprockets
   sqlite3
   test-unit
diff --git a/README.md b/README.md
index 5f46d4ee9..2d745afe1 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-## MapKnitter 2 [![Coverage Status](https://coveralls.io/repos/github/publiclab/mapknitter/badge.svg?branch=%28HEAD+detached+at+FETCH_HEAD%29)](https://coveralls.io/github/publiclab/mapknitter?branch=%28HEAD+detached+at+FETCH_HEAD%29)
+## MapKnitter 2 [![Coverage Status](https://coveralls.io/repos/github/publiclab/mapknitter/badge.svg?branch=%28HEAD+detached+at+FETCH_HEAD%29)](https://coveralls.io/github/publiclab/mapknitter?branch=%28HEAD+detached+at+FETCH_HEAD%29) [![codecov](https://codecov.io/gh/publiclab/mapknitter/branch/main/graph/badge.svg)](https://codecov.io/gh/publiclab/mapknitter)
 
 Use Public Lab's open source MapKnitter to upload your own aerial photographs (for example those from balloon or kite mapping: http://publiclab.org/balloon-mapping) and combine them into:
 
diff --git a/test/test_helper.rb b/test/test_helper.rb
index 320e5e9ae..8b0be3ba0 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,6 +1,7 @@
-require 'coveralls'
-Coveralls.wear!('rails')
 ENV["RAILS_ENV"] = "test"
+
+require 'simplecov'
+
 require File.expand_path('../../config/environment', __FILE__)
 require 'rails/test_help'