diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/Filter.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/Filter.kt
new file mode 100644
index 00000000..f1ecdd1a
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/Filter.kt
@@ -0,0 +1,51 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+import dev.usbharu.hideout.core.domain.model.filter.Filter.Companion.Action.SET_KEYWORDS
+import dev.usbharu.hideout.core.domain.model.filter.FilterMode.*
+import dev.usbharu.hideout.core.domain.model.userdetails.UserDetail
+import dev.usbharu.hideout.core.domain.model.userdetails.UserDetailId
+
+class Filter(
+    val id: FilterId,
+    val userDetailId: UserDetailId,
+    var name: FilterName,
+    val filterContext: List<FilterContext>,
+    val filterAction: FilterAction,
+    filterKeywords: Set<FilterKeyword>
+) {
+    var filterKeywords = filterKeywords
+        private set
+
+    fun setFilterKeywords(filterKeywords: Set<FilterKeyword>, user: UserDetail) {
+        require(isAllow(user, SET_KEYWORDS, this))
+        this.filterKeywords = filterKeywords
+    }
+
+    fun compileFilter(): Regex {
+        val words = mutableListOf<String>()
+        val wholeWords = mutableListOf<String>()
+        val regexes = mutableListOf<String>()
+
+        for (filterKeyword in filterKeywords) {
+            when (filterKeyword.mode) {
+                WHOLE_WORD -> wholeWords.add(filterKeyword.keyword.keyword)
+                REGEX -> regexes.add(filterKeyword.keyword.keyword)
+                NONE -> words.add(filterKeyword.keyword.keyword)
+            }
+        }
+
+        return Regex("")
+    }
+
+    companion object {
+        fun isAllow(user: UserDetail, action: Action, resource: Filter): Boolean {
+            return when (action) {
+                SET_KEYWORDS -> resource.userDetailId == user.id
+            }
+        }
+
+        enum class Action {
+            SET_KEYWORDS
+        }
+    }
+}
\ No newline at end of file
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterAction.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterAction.kt
new file mode 100644
index 00000000..ac3e8b88
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterAction.kt
@@ -0,0 +1,6 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+enum class FilterAction {
+    warn,
+    hide
+}
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterContext.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterContext.kt
new file mode 100644
index 00000000..418f9573
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterContext.kt
@@ -0,0 +1,9 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+enum class FilterContext {
+    home,
+    notifications,
+    public,
+    thread,
+    account
+}
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterId.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterId.kt
new file mode 100644
index 00000000..ce42a4c4
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterId.kt
@@ -0,0 +1,4 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+@JvmInline
+value class FilterId(val id: Long)
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterKeyword.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterKeyword.kt
new file mode 100644
index 00000000..5565c8e9
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterKeyword.kt
@@ -0,0 +1,17 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+import dev.usbharu.hideout.core.domain.model.filter.FilterMode.*
+
+class FilterKeyword(
+    val id: FilterKeywordId,
+    var keyword: FilterKeywordKeyword,
+    val mode: FilterMode
+) {
+    fun match(string: String): Boolean {
+        when (mode) {
+            WHOLE_WORD -> TODO()
+            REGEX -> TODO()
+            NONE -> TODO()
+        }
+    }
+}
\ No newline at end of file
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterKeywordId.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterKeywordId.kt
new file mode 100644
index 00000000..4f1b2df5
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterKeywordId.kt
@@ -0,0 +1,4 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+@JvmInline
+value class FilterKeywordId(val id: Long)
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterKeywordKeyword.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterKeywordKeyword.kt
new file mode 100644
index 00000000..89e959b3
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterKeywordKeyword.kt
@@ -0,0 +1,4 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+@JvmInline
+value class FilterKeywordKeyword(val keyword: String)
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterMode.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterMode.kt
new file mode 100644
index 00000000..57e38fb7
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterMode.kt
@@ -0,0 +1,7 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+enum class FilterMode {
+    WHOLE_WORD,
+    REGEX,
+    NONE
+}
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterName.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterName.kt
new file mode 100644
index 00000000..09e424de
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterName.kt
@@ -0,0 +1,4 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+@JvmInline
+value class FilterName(val name: String)
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterRepository.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterRepository.kt
new file mode 100644
index 00000000..17a4cacc
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterRepository.kt
@@ -0,0 +1,6 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+interface FilterRepository {
+    suspend fun save(filter: Filter): Filter
+    suspend fun delete(filter: Filter)
+}
\ No newline at end of file
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterResult.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterResult.kt
new file mode 100644
index 00000000..8466d9b4
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilterResult.kt
@@ -0,0 +1,4 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+class FilterResult(val filter: Filter, val matchedKeyword: FilterKeywordKeyword) {
+}
\ No newline at end of file
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilteredPost.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilteredPost.kt
new file mode 100644
index 00000000..4081c651
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/model/filter/FilteredPost.kt
@@ -0,0 +1,5 @@
+package dev.usbharu.hideout.core.domain.model.filter
+
+import dev.usbharu.hideout.core.domain.model.post.Post
+
+class FilteredPost(val post: Post, val filterResults: List<FilterResult>)
\ No newline at end of file
diff --git a/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/service/filter/FilterDomainService.kt b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/service/filter/FilterDomainService.kt
new file mode 100644
index 00000000..47812ae6
--- /dev/null
+++ b/hideout-core/src/main/kotlin/dev/usbharu/hideout/core/domain/service/filter/FilterDomainService.kt
@@ -0,0 +1,22 @@
+package dev.usbharu.hideout.core.domain.service.filter
+
+import dev.usbharu.hideout.core.domain.model.filter.Filter
+import dev.usbharu.hideout.core.domain.model.filter.FilterContext
+import dev.usbharu.hideout.core.domain.model.filter.FilteredPost
+import dev.usbharu.hideout.core.domain.model.post.Post
+
+interface IFilterDomainService {
+    fun apply(post: Post, context: FilterContext, filters: List<Filter>): FilteredPost
+    fun applyAll(postList: List<Post>, context: FilterContext, filters: List<Filter>): List<FilteredPost>
+}
+
+class FilterDomainService : IFilterDomainService {
+    override fun apply(post: Post, context: FilterContext, filters: List<Filter>): FilteredPost {
+        filters.filter { it.filterContext.contains(context) }
+    }
+
+    override fun applyAll(postList: List<Post>, context: FilterContext, filters: List<Filter>): List<FilteredPost> {
+        TODO("Not yet implemented")
+    }
+
+}
\ No newline at end of file