diff --git a/.github/workflows/ci-test-frontend.yml b/.github/workflows/ci-test-frontend.yml
index 36a1bc1d..4b650202 100644
--- a/.github/workflows/ci-test-frontend.yml
+++ b/.github/workflows/ci-test-frontend.yml
@@ -71,5 +71,10 @@ jobs:
       - run: npm ci --loglevel warn
         working-directory: ./frontend
 
-      - run: npm run test
+      - run: npm run test:coverage
         working-directory: ./frontend
+
+      - name: submit coverage
+        run: node ${{ github.workspace }}/frontend/node_modules/.bin/codecov
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
diff --git a/README.md b/README.md
index 4ee19883..7da08ac7 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,5 @@
-# remark42 [![Build Status](https://github.com/umputun/remark42/workflows/build/badge.svg)](https://github.com/umputun/remark42/actions) [![Go Report Card](https://goreportcard.com/badge/github.com/umputun/remark42)](https://goreportcard.com/report/github.com/umputun/remark42) [![Coverage Status](https://coveralls.io/repos/github/umputun/remark42/badge.svg?branch=master)](https://coveralls.io/github/umputun/remark42?branch=master)
+# remark42 [![Build Status](https://github.com/umputun/remark42/workflows/build/badge.svg)](https://github.com/umputun/remark42/actions) [![Go Report Card](https://goreportcard.com/badge/github.com/umputun/remark42)](https://goreportcard.com/report/github.com/umputun/remark42) [![Coverage Status](https://coveralls.io/repos/github/umputun/remark42/badge.svg?branch=master)](https://coveralls.io/github/umputun/remark42?branch=master) [![codecov](https://codecov.io/gh/umputun/remark42/branch/master/graph/badge.svg)](https://codecov.io/gh/umputun/remark42)
+
 
 
 
diff --git a/frontend/codecov.yml b/frontend/codecov.yml
new file mode 100644
index 00000000..92a4a996
--- /dev/null
+++ b/frontend/codecov.yml
@@ -0,0 +1,5 @@
+codecov:
+  notify:
+    require_ci_to_pass: false
+
+comment: false
diff --git a/frontend/jest.config.js b/frontend/jest.config.js
index 39360dc5..d45a66e4 100644
--- a/frontend/jest.config.js
+++ b/frontend/jest.config.js
@@ -17,4 +17,5 @@ module.exports = {
   },
   setupFilesAfterEnv: ['<rootDir>/app/testUtils/index.ts', 'jest-localstorage-mock'],
   transformIgnorePatterns: ['/node_modules/(?!intl-messageformat|intl-messageformat-parser).+\\.js$'],
+  collectCoverageFrom: ['!app/testUtils/**', '!app/locales/**'],
 };
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 1b331c2b..cec2a887 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -4436,6 +4436,12 @@
         "unist-util-find-all-after": "^3.0.1"
       }
     },
+    "@tootallnate/once": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-1.1.2.tgz",
+      "integrity": "sha512-RbzJvlNzmRq5c3O09UipeuXno4tA1FE6ikOjxZK0tuxVv3412l64l5t1W5pj4+rJq9vpkm/kwiR07aZXnsKPxw==",
+      "dev": true
+    },
     "@types/anymatch": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/@types/anymatch/-/anymatch-1.3.1.tgz",
@@ -5140,6 +5146,15 @@
       "integrity": "sha512-OPdCF6GsMIP+Az+aWfAAOEt2/+iVDKE7oy6lJ098aoe59oAmK76qV6Gw60SbZ8jHuG2wH058GF4pLFbYamYrVA==",
       "dev": true
     },
+    "agent-base": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.1.tgz",
+      "integrity": "sha512-01q25QQDwLSsyfhrKbn8yuur+JNw0H+0Y4JiGIKd3z9aYk/w/2kxD/Upc+t2ZBBSUNff50VjPsSW2YxM8QYKVg==",
+      "dev": true,
+      "requires": {
+        "debug": "4"
+      }
+    },
     "aggregate-error": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.0.1.tgz",
@@ -5255,6 +5270,12 @@
         "sprintf-js": "~1.0.2"
       }
     },
+    "argv": {
+      "version": "0.0.2",
+      "resolved": "https://registry.npmjs.org/argv/-/argv-0.0.2.tgz",
+      "integrity": "sha1-7L0W+JSbFXGDcRsb2jNPN4QBhas=",
+      "dev": true
+    },
     "aria-query": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/aria-query/-/aria-query-3.0.0.tgz",
@@ -7315,6 +7336,19 @@
       "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
       "integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c="
     },
+    "codecov": {
+      "version": "3.7.2",
+      "resolved": "https://registry.npmjs.org/codecov/-/codecov-3.7.2.tgz",
+      "integrity": "sha512-fmCjAkTese29DUX3GMIi4EaKGflHa4K51EoMc29g8fBHawdk/+KEq5CWOeXLdd9+AT7o1wO4DIpp/Z1KCqCz1g==",
+      "dev": true,
+      "requires": {
+        "argv": "0.0.2",
+        "ignore-walk": "3.0.3",
+        "js-yaml": "3.13.1",
+        "teeny-request": "6.0.1",
+        "urlgrey": "0.4.4"
+      }
+    },
     "collapse-white-space": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/collapse-white-space/-/collapse-white-space-1.0.6.tgz",
@@ -11233,6 +11267,17 @@
         "requires-port": "^1.0.0"
       }
     },
+    "http-proxy-agent": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/http-proxy-agent/-/http-proxy-agent-4.0.1.tgz",
+      "integrity": "sha512-k0zdNgqWTGA6aeIRVpvfVob4fL52dTfaehylg0Y4UvSySvOq/Y+BOyPrgpUrA7HylqvU8vIZGsRuXmspskV0Tg==",
+      "dev": true,
+      "requires": {
+        "@tootallnate/once": "1",
+        "agent-base": "6",
+        "debug": "4"
+      }
+    },
     "http-proxy-middleware": {
       "version": "0.19.1",
       "resolved": "https://registry.npmjs.org/http-proxy-middleware/-/http-proxy-middleware-0.19.1.tgz",
@@ -11262,6 +11307,24 @@
       "integrity": "sha1-7AbBDgo0wPL68Zn3/X/Hj//QPHM=",
       "dev": true
     },
+    "https-proxy-agent": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-4.0.0.tgz",
+      "integrity": "sha512-zoDhWrkR3of1l9QAL8/scJZyLu8j/gBkcwcaQOZh7Gyh/+uJQzGVETdgT30akuwkpL8HTRfssqI3BZuV18teDg==",
+      "dev": true,
+      "requires": {
+        "agent-base": "5",
+        "debug": "4"
+      },
+      "dependencies": {
+        "agent-base": {
+          "version": "5.1.1",
+          "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-5.1.1.tgz",
+          "integrity": "sha512-TMeqbNl2fMW0nMjTEPOwe3J/PRFP4vqeoNuQMG0HlMrtm5QxKqdvAkZ1pRBQ/ulIyDD5Yq0nJ7YbdD8ey0TO3g==",
+          "dev": true
+        }
+      }
+    },
     "human-signals": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/human-signals/-/human-signals-1.1.1.tgz",
@@ -11431,7 +11494,6 @@
       "resolved": false,
       "integrity": "sha512-m7o6xuOaT1aqheYHKf8W6J5pYH85ZI9w077erOzLje3JsB1gkafkAhHHY19dqjulgIZHFm32Cp5uNZgcQqdJKw==",
       "dev": true,
-      "optional": true,
       "requires": {
         "minimatch": "^3.0.4"
       }
@@ -21234,6 +21296,15 @@
         "stream-shift": "^1.0.0"
       }
     },
+    "stream-events": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/stream-events/-/stream-events-1.0.5.tgz",
+      "integrity": "sha512-E1GUzBSgvct8Jsb3v2X15pjzN1tYebtbLaMg+eBOUOAxgbLoSbT2NS91ckc5lJD1KfLjId+jXJRgo0qnV5Nerg==",
+      "dev": true,
+      "requires": {
+        "stubs": "^3.0.0"
+      }
+    },
     "stream-http": {
       "version": "2.8.3",
       "resolved": "https://registry.npmjs.org/stream-http/-/stream-http-2.8.3.tgz",
@@ -21821,6 +21892,12 @@
       "integrity": "sha512-e6/d0eBu7gHtdCqFt0xJr642LdToM5/cN4Qb9DbHjVx1CP5RyeM+zH7pbecEmDv/lBqb0QH+6Uqq75rxFPkM0w==",
       "dev": true
     },
+    "stubs": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/stubs/-/stubs-3.0.0.tgz",
+      "integrity": "sha1-6NK6H6nJBXAwPAMLaQD31fiavls=",
+      "dev": true
+    },
     "style-loader": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/style-loader/-/style-loader-1.1.3.tgz",
@@ -22560,6 +22637,19 @@
         }
       }
     },
+    "teeny-request": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/teeny-request/-/teeny-request-6.0.1.tgz",
+      "integrity": "sha512-TAK0c9a00ELOqLrZ49cFxvPVogMUFaWY8dUsQc/0CuQPGF+BOxOQzXfE413BAk2kLomwNplvdtMpeaeGWmoc2g==",
+      "dev": true,
+      "requires": {
+        "http-proxy-agent": "^4.0.0",
+        "https-proxy-agent": "^4.0.0",
+        "node-fetch": "^2.2.0",
+        "stream-events": "^1.0.5",
+        "uuid": "^3.3.2"
+      }
+    },
     "terminal-link": {
       "version": "2.1.1",
       "resolved": "https://registry.npmjs.org/terminal-link/-/terminal-link-2.1.1.tgz",
@@ -23451,6 +23541,12 @@
         }
       }
     },
+    "urlgrey": {
+      "version": "0.4.4",
+      "resolved": "https://registry.npmjs.org/urlgrey/-/urlgrey-0.4.4.tgz",
+      "integrity": "sha1-iS/pWWCAXoVRnxzUOJ8stMu3ZS8=",
+      "dev": true
+    },
     "use": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index 736eeba4..8523544a 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -73,6 +73,7 @@
     "babel-loader": "^8.1.0",
     "caniuse-lite": "^1.0.30001118",
     "clean-webpack-plugin": "^3.0.0",
+    "codecov": "^3.7.2",
     "copy-webpack-plugin": "^6.0.3",
     "cross-env": "^7.0.2",
     "css-loader": "^3.5.2",