diff --git a/.idea/dictionaries/Kuba.xml b/.idea/dictionaries/Kuba.xml
index 592a5d5e..aba38775 100644
--- a/.idea/dictionaries/Kuba.xml
+++ b/.idea/dictionaries/Kuba.xml
@@ -13,6 +13,7 @@
       <w>synergia</w>
       <w>szczodrzyński</w>
       <w>szkolny</w>
+      <w>usos</w>
     </words>
   </dictionary>
 </component>
\ No newline at end of file
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Errors.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Errors.kt
index 227561e6..617ef5ed 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Errors.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/Errors.kt
@@ -204,6 +204,8 @@ const val ERROR_PODLASIE_API_NO_TOKEN                       = 630
 const val ERROR_PODLASIE_API_OTHER                          = 631
 const val ERROR_PODLASIE_API_DATA_MISSING                   = 632
 
+const val ERROR_USOS_OAUTH_LOGIN_REQUEST                    = 701
+
 const val ERROR_TEMPLATE_WEB_OTHER                          = 801
 
 const val EXCEPTION_API_TASK                                = 900
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/LoginMethods.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/LoginMethods.kt
index 0f0c07ae..9825ea3f 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/LoginMethods.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/LoginMethods.kt
@@ -13,6 +13,7 @@ import pl.szczodrzynski.edziennik.data.api.edziennik.mobidziennik.login.Mobidzie
 import pl.szczodrzynski.edziennik.data.api.edziennik.podlasie.login.PodlasieLoginApi
 import pl.szczodrzynski.edziennik.data.api.edziennik.template.login.TemplateLoginApi
 import pl.szczodrzynski.edziennik.data.api.edziennik.template.login.TemplateLoginWeb
+import pl.szczodrzynski.edziennik.data.api.edziennik.usos.login.UsosLoginApi
 import pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.login.VulcanLoginHebe
 import pl.szczodrzynski.edziennik.data.api.edziennik.vulcan.login.VulcanLoginWebMain
 import pl.szczodrzynski.edziennik.data.api.models.LoginMethod
@@ -127,6 +128,15 @@ val podlasieLoginMethods = listOf(
                 .withRequiredLoginMethod { _, _ -> LOGIN_METHOD_NOT_NEEDED }
 )
 
+const val LOGIN_TYPE_USOS = 7
+const val LOGIN_MODE_USOS_OAUTH = 0
+const val LOGIN_METHOD_USOS_API = 100
+val usosLoginMethods = listOf(
+        LoginMethod(LOGIN_TYPE_USOS, LOGIN_METHOD_USOS_API, UsosLoginApi::class.java)
+                .withIsPossible { _, _ -> true }
+                .withRequiredLoginMethod { _, _ -> LOGIN_METHOD_NOT_NEEDED }
+)
+
 val templateLoginMethods = listOf(
         LoginMethod(LOGIN_TYPE_TEMPLATE, LOGIN_METHOD_TEMPLATE_WEB, TemplateLoginWeb::class.java)
                 .withIsPossible { _, _ -> true }
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/DataUsos.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/DataUsos.kt
new file mode 100644
index 00000000..b4a925bf
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/DataUsos.kt
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2022-10-11.
+ */
+
+package pl.szczodrzynski.edziennik.data.api.edziennik.usos
+
+import pl.szczodrzynski.edziennik.App
+import pl.szczodrzynski.edziennik.data.api.LOGIN_METHOD_USOS_API
+import pl.szczodrzynski.edziennik.data.api.models.Data
+import pl.szczodrzynski.edziennik.data.db.entity.LoginStore
+import pl.szczodrzynski.edziennik.data.db.entity.Profile
+
+class DataUsos(
+    app: App,
+    profile: Profile?,
+    loginStore: LoginStore,
+) : Data(app, profile, loginStore) {
+
+    fun isApiLoginValid() = oauthTokenKey != null && oauthTokenSecret != null
+
+    override fun satisfyLoginMethods() {
+        loginMethods.clear()
+        if (isApiLoginValid()) {
+            loginMethods += LOGIN_METHOD_USOS_API
+        }
+    }
+
+    override fun generateUserCode() = "USOS:TEST"
+
+    var oauthTokenKey: String?
+        get() { mOauthTokenKey = mOauthTokenKey ?: loginStore.getLoginData("oauthTokenKey", null); return mOauthTokenKey }
+        set(value) { loginStore.putLoginData("oauthTokenKey", value); mOauthTokenKey = value }
+    private var mOauthTokenKey: String? = null
+
+    var oauthTokenSecret: String?
+        get() { mOauthTokenSecret = mOauthTokenSecret ?: loginStore.getLoginData("oauthTokenSecret", null); return mOauthTokenSecret }
+        set(value) { loginStore.putLoginData("oauthTokenSecret", value); mOauthTokenSecret = value }
+    private var mOauthTokenSecret: String? = null
+}
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/Usos.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/Usos.kt
new file mode 100644
index 00000000..c97e3695
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/Usos.kt
@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2022-10-11.
+ */
+
+package pl.szczodrzynski.edziennik.data.api.edziennik.usos
+
+import com.google.gson.JsonObject
+import pl.szczodrzynski.edziennik.App
+import pl.szczodrzynski.edziennik.data.api.edziennik.usos.login.UsosLogin
+import pl.szczodrzynski.edziennik.data.api.interfaces.EdziennikCallback
+import pl.szczodrzynski.edziennik.data.api.interfaces.EdziennikInterface
+import pl.szczodrzynski.edziennik.data.api.models.ApiError
+import pl.szczodrzynski.edziennik.data.api.prepare
+import pl.szczodrzynski.edziennik.data.api.usosLoginMethods
+import pl.szczodrzynski.edziennik.data.db.entity.LoginStore
+import pl.szczodrzynski.edziennik.data.db.entity.Profile
+import pl.szczodrzynski.edziennik.data.db.entity.Teacher
+import pl.szczodrzynski.edziennik.data.db.full.AnnouncementFull
+import pl.szczodrzynski.edziennik.data.db.full.EventFull
+import pl.szczodrzynski.edziennik.data.db.full.MessageFull
+import pl.szczodrzynski.edziennik.utils.Utils.d
+
+class Usos(
+    val app: App,
+    val profile: Profile?,
+    val loginStore: LoginStore,
+    val callback: EdziennikCallback,
+) : EdziennikInterface {
+    companion object {
+        private const val TAG = "Usos"
+    }
+
+    val internalErrorList = mutableListOf<Int>()
+    val data: DataUsos
+
+    init {
+        data = DataUsos(app, profile, loginStore).apply {
+            callback = wrapCallback(this@Usos.callback)
+            satisfyLoginMethods()
+        }
+    }
+
+    private fun completed() {
+        data.saveData()
+        callback.onCompleted()
+    }
+
+    override fun sync(
+        featureIds: List<Int>,
+        viewId: Int?,
+        onlyEndpoints: List<Int>?,
+        arguments: JsonObject?,
+    ) {
+        data.arguments = arguments
+        data.prepare(usosLoginMethods, UsosFeatures, featureIds, viewId, onlyEndpoints)
+        d(TAG, "LoginMethod IDs: ${data.targetLoginMethodIds}")
+        d(TAG, "Endpoint IDs: ${data.targetEndpointIds}")
+        UsosLogin(data) {
+            /*UsosData(data) {
+                completed()
+            }*/
+        }
+    }
+
+    override fun getMessage(message: MessageFull) {}
+    override fun sendMessage(recipients: List<Teacher>, subject: String, text: String) {}
+    override fun markAllAnnouncementsAsRead() {}
+    override fun getAnnouncement(announcement: AnnouncementFull) {}
+    override fun getAttachment(owner: Any, attachmentId: Long, attachmentName: String) {}
+    override fun getRecipientList() {}
+    override fun getEvent(eventFull: EventFull) {}
+
+    override fun firstLogin() {
+        /*UsosFirstLogin(data) {
+            completed()
+        }*/
+    }
+
+    override fun cancel() {
+        d(TAG, "Cancelled")
+        data.cancel()
+    }
+
+    private fun wrapCallback(callback: EdziennikCallback): EdziennikCallback {
+        return object : EdziennikCallback {
+            override fun onCompleted() {
+                callback.onCompleted()
+            }
+
+            override fun onProgress(step: Float) {
+                callback.onProgress(step)
+            }
+
+            override fun onStartProgress(stringRes: Int) {
+                callback.onStartProgress(stringRes)
+            }
+
+            override fun onError(apiError: ApiError) {
+                when (apiError.errorCode) {
+                    in internalErrorList -> {
+                        // finish immediately if the same error occurs twice during the same sync
+                        callback.onError(apiError)
+                    }
+                    else -> callback.onError(apiError)
+                }
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/UsosFeatures.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/UsosFeatures.kt
new file mode 100644
index 00000000..a4ee1389
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/UsosFeatures.kt
@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2022-10-11.
+ */
+
+package pl.szczodrzynski.edziennik.data.api.edziennik.usos
+
+import pl.szczodrzynski.edziennik.data.api.FEATURE_STUDENT_INFO
+import pl.szczodrzynski.edziennik.data.api.LOGIN_METHOD_USOS_API
+import pl.szczodrzynski.edziennik.data.api.LOGIN_TYPE_USOS
+import pl.szczodrzynski.edziennik.data.api.models.Feature
+
+const val ENDPOINT_USOS_API_USER = 7000
+
+val UsosFeatures = listOf(
+    Feature(LOGIN_TYPE_USOS, FEATURE_STUDENT_INFO, listOf(
+        ENDPOINT_USOS_API_USER to LOGIN_METHOD_USOS_API,
+    ), listOf(LOGIN_METHOD_USOS_API)),
+)
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/login/UsosLogin.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/login/UsosLogin.kt
new file mode 100644
index 00000000..599b8f16
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/login/UsosLogin.kt
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2022-10-11.
+ */
+
+package pl.szczodrzynski.edziennik.data.api.edziennik.usos.login
+
+import pl.szczodrzynski.edziennik.R
+import pl.szczodrzynski.edziennik.data.api.LOGIN_METHOD_USOS_API
+import pl.szczodrzynski.edziennik.data.api.edziennik.usos.DataUsos
+import pl.szczodrzynski.edziennik.utils.Utils.d
+
+class UsosLogin(val data: DataUsos, val onSuccess: () -> Unit) {
+    companion object {
+        private const val TAG = "UsosLogin"
+    }
+
+    private var cancelled = false
+
+    init {
+        nextLoginMethod(onSuccess)
+    }
+
+    private fun nextLoginMethod(onSuccess: () -> Unit) {
+        if (data.targetLoginMethodIds.isEmpty()) {
+            onSuccess()
+            return
+        }
+        if (cancelled) {
+            onSuccess()
+            return
+        }
+        useLoginMethod(data.targetLoginMethodIds.removeAt(0)) { usedMethodId ->
+            data.progress(data.progressStep)
+            if (usedMethodId != -1)
+                data.loginMethods.add(usedMethodId)
+            nextLoginMethod(onSuccess)
+        }
+    }
+
+    private fun useLoginMethod(loginMethodId: Int, onSuccess: (usedMethodId: Int) -> Unit) {
+        // this should never be true
+        if (data.loginMethods.contains(loginMethodId)) {
+            onSuccess(-1)
+            return
+        }
+        d(TAG, "Using login method $loginMethodId")
+        when (loginMethodId) {
+            LOGIN_METHOD_USOS_API -> {
+                data.startProgress(R.string.edziennik_progress_login_usos_api)
+                UsosLoginApi(data) { onSuccess(loginMethodId) }
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/login/UsosLoginApi.kt b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/login/UsosLoginApi.kt
new file mode 100644
index 00000000..bdf771c3
--- /dev/null
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/data/api/edziennik/usos/login/UsosLoginApi.kt
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) Kuba Szczodrzyński 2022-10-11.
+ */
+
+package pl.szczodrzynski.edziennik.data.api.edziennik.usos.login
+
+import pl.szczodrzynski.edziennik.data.api.ERROR_PROFILE_MISSING
+import pl.szczodrzynski.edziennik.data.api.ERROR_USOS_OAUTH_LOGIN_REQUEST
+import pl.szczodrzynski.edziennik.data.api.edziennik.usos.DataUsos
+import pl.szczodrzynski.edziennik.data.api.models.ApiError
+
+class UsosLoginApi(val data: DataUsos, val onSuccess: () -> Unit) {
+    companion object {
+        private const val TAG = "UsosLoginApi"
+    }
+
+    init { run {
+        if (data.profile == null) {
+            data.error(ApiError(TAG, ERROR_PROFILE_MISSING))
+            return@run
+        }
+
+        if (data.isApiLoginValid()) {
+            onSuccess()
+        } else {
+            data.error(ApiError(TAG, ERROR_USOS_OAUTH_LOGIN_REQUEST))
+        }
+    }}
+}
diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginInfo.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginInfo.kt
index 0448b514..be6d62d8 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginInfo.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/login/LoginInfo.kt
@@ -313,7 +313,24 @@ object LoginInfo {
                         errorCodes = mapOf()
                     )
                 )
-            )
+            ),
+            Register(
+                loginType = LOGIN_TYPE_USOS,
+                internalName = "usos",
+                registerName = R.string.login_type_usos,
+                registerLogo = R.drawable.login_logo_usos,
+                loginModes = listOf(
+                    Mode(
+                        loginMode = LOGIN_MODE_USOS_OAUTH,
+                        name = R.string.login_mode_usos_oauth,
+                        icon = R.drawable.login_logo_usos,
+                        guideText = R.string.login_mode_usos_oauth_guide,
+                        isPlatformSelection = true,
+                        credentials = listOf(),
+                        errorCodes = mapOf(),
+                    ),
+                ),
+            ),
         )
     }
 
diff --git a/app/src/main/res/drawable/login_logo_usos.png b/app/src/main/res/drawable/login_logo_usos.png
new file mode 100644
index 00000000..7c376bdd
Binary files /dev/null and b/app/src/main/res/drawable/login_logo_usos.png differ
diff --git a/app/src/main/res/values/errors.xml b/app/src/main/res/values/errors.xml
index f0916a8b..4e978f7b 100644
--- a/app/src/main/res/values/errors.xml
+++ b/app/src/main/res/values/errors.xml
@@ -174,6 +174,8 @@
     <string name="error_631" translatable="false">ERROR_PODLASIE_API_OTHER</string>
     <string name="error_632" translatable="false">ERROR_PODLASIE_API_DATA_MISSING</string>
 
+    <string name="error_701" translatable="false">ERROR_USOS_OAUTH_LOGIN_REQUEST</string>
+
     <string name="error_801" translatable="false">ERROR_TEMPLATE_WEB_OTHER</string>
 
     <string name="error_900" translatable="false">EXCEPTION_API_TASK</string>
@@ -364,6 +366,8 @@
     <string name="error_631_reason">ERROR_PODLASIE_API_OTHER</string>
     <string name="error_632_reason">Brak danych. Zgłoś błąd programiście.</string>
 
+    <string name="error_701_reason">Wymagane logowanie w przeglądarce</string>
+
     <string name="error_801_reason">ERROR_TEMPLATE_WEB_OTHER</string>
 
     <string name="error_900_reason">Błąd synchronizacji. Upewnij się, że masz połączenie z internetem, a następnie zgłoś błąd.</string>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index a8f81073..66ac0299 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1537,4 +1537,8 @@
     <string name="login_summary_account_parent">(rodzic)</string>
     <string name="grades_subject_unknown">- nieznany przedmiot -</string>
     <string name="grades_subject_unknown_help">{cmd-information-outline} Oceny, których przedmiot nie został podany w dzienniku. Może to być na przykład taki, który nie jest prowadzony w tym roku szkolnym.</string>
+    <string name="edziennik_progress_login_usos_api">Logowanie do USOS API...</string>
+    <string name="login_type_usos">USOS</string>
+    <string name="login_mode_usos_oauth">Logowanie z użyciem przeglądarki</string>
+    <string name="login_mode_usos_oauth_guide">TODO</string>
 </resources>