diff --git a/.github/workflows/test-backend.yml b/.github/workflows/test-backend.yml
index 562ec76b85..77bbdb2b0a 100644
--- a/.github/workflows/test-backend.yml
+++ b/.github/workflows/test-backend.yml
@@ -48,6 +48,13 @@ jobs:
         image: redis:7
         ports:
           - 56312:6379
+      meilisearch:
+        image: getmeili/meilisearch:v1.3.4
+        ports:
+          - 57712:7700
+        env:
+          MEILI_NO_ANALYTICS: true
+          MEILI_ENV: development
 
     steps:
     - uses: actions/checkout@v6.0.1
diff --git a/packages/backend/test/compose.yml b/packages/backend/test/compose.yml
index fe96616fc0..4f1dba6428 100644
--- a/packages/backend/test/compose.yml
+++ b/packages/backend/test/compose.yml
@@ -11,3 +11,11 @@ services:
     environment:
       POSTGRES_DB: "test-misskey"
       POSTGRES_HOST_AUTH_METHOD: trust
+
+  meilisearchtest:
+    image: getmeili/meilisearch:v1.3.4
+    ports:
+      - "127.0.0.1:57712:7700"
+    environment:
+      - MEILI_NO_ANALYTICS=true
+      - MEILI_ENV=development
diff --git a/packages/backend/test/unit/SearchService.ts b/packages/backend/test/unit/SearchService.ts
new file mode 100644
index 0000000000..6e17bef1c3
--- /dev/null
+++ b/packages/backend/test/unit/SearchService.ts
@@ -0,0 +1,483 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { afterAll, afterEach, beforeAll, describe, expect, test } from '@jest/globals';
+import { Test, TestingModule } from '@nestjs/testing';
+import type { Index, MeiliSearch } from 'meilisearch';
+import { type Config, loadConfig } from '@/config.js';
+import { GlobalModule } from '@/GlobalModule.js';
+import { CoreModule } from '@/core/CoreModule.js';
+import { SearchService } from '@/core/SearchService.js';
+import { CacheService } from '@/core/CacheService.js';
+import { IdService } from '@/core/IdService.js';
+import { DI } from '@/di-symbols.js';
+import {
+	type BlockingsRepository,
+	type ChannelsRepository,
+	type FollowingsRepository,
+	type MutingsRepository,
+	type NotesRepository,
+	type UserProfilesRepository,
+	type UsersRepository,
+	type MiChannel,
+	type MiNote,
+	type MiUser,
+} from '@/models/_.js';
+
+describe('SearchService', () => {
+	type TestContext = {
+		app: TestingModule;
+		service: SearchService;
+		cacheService: CacheService;
+		idService: IdService;
+		mutingsRepository: MutingsRepository;
+		blockingsRepository: BlockingsRepository;
+		usersRepository: UsersRepository;
+		userProfilesRepository: UserProfilesRepository;
+		notesRepository: NotesRepository;
+		channelsRepository: ChannelsRepository;
+		followingsRepository: FollowingsRepository;
+		indexer?: (note: MiNote) => Promise<void>;
+	};
+
+	const meilisearchSettings = {
+		searchableAttributes: [
+			'text',
+			'cw',
+		],
+		sortableAttributes: [
+			'createdAt',
+		],
+		filterableAttributes: [
+			'createdAt',
+			'userId',
+			'userHost',
+			'channelId',
+			'tags',
+		],
+		typoTolerance: {
+			enabled: false,
+		},
+		pagination: {
+			maxTotalHits: 10000,
+		},
+	};
+
+	async function buildContext(configOverride?: Config): Promise<TestContext> {
+		const builder = Test.createTestingModule({
+			imports: [
+				GlobalModule,
+				CoreModule,
+			],
+		});
+
+		if (configOverride) {
+			builder.overrideProvider(DI.config).useValue(configOverride);
+		}
+
+		const app = await builder.compile();
+
+		app.enableShutdownHooks();
+
+		return {
+			app,
+			service: app.get(SearchService),
+			cacheService: app.get(CacheService),
+			idService: app.get(IdService),
+			mutingsRepository: app.get(DI.mutingsRepository),
+			blockingsRepository: app.get(DI.blockingsRepository),
+			usersRepository: app.get(DI.usersRepository),
+			userProfilesRepository: app.get(DI.userProfilesRepository),
+			notesRepository: app.get(DI.notesRepository),
+			channelsRepository: app.get(DI.channelsRepository),
+			followingsRepository: app.get(DI.followingsRepository),
+		};
+	}
+
+	async function cleanupContext(ctx: TestContext) {
+		await ctx.notesRepository.createQueryBuilder().delete().execute();
+		await ctx.mutingsRepository.createQueryBuilder().delete().execute();
+		await ctx.blockingsRepository.createQueryBuilder().delete().execute();
+		await ctx.followingsRepository.createQueryBuilder().delete().execute();
+		await ctx.channelsRepository.createQueryBuilder().delete().execute();
+		await ctx.userProfilesRepository.createQueryBuilder().delete().execute();
+		await ctx.usersRepository.createQueryBuilder().delete().execute();
+	}
+
+	async function createUser(ctx: TestContext, data: Partial<MiUser> = {}) {
+		const id = ctx.idService.gen();
+		const username = data.username ?? `user_${id}`;
+		const usernameLower = data.usernameLower ?? username.toLowerCase();
+
+		const user = await ctx.usersRepository
+			.insert({
+				id,
+				username,
+				usernameLower,
+				...data,
+			})
+			.then(x => ctx.usersRepository.findOneByOrFail(x.identifiers[0]));
+
+		await ctx.userProfilesRepository.insert({
+			userId: id,
+		});
+
+		return user;
+	}
+
+	async function createChannel(ctx: TestContext, user: MiUser, data: Partial<MiChannel> = {}) {
+		const id = ctx.idService.gen();
+		const channel = await ctx.channelsRepository
+			.insert({
+				id,
+				userId: user.id,
+				name: data.name ?? `channel_${id}`,
+				...data,
+			})
+			.then(x => ctx.channelsRepository.findOneByOrFail(x.identifiers[0]));
+
+		return channel;
+	}
+
+	async function createNote(ctx: TestContext, user: MiUser, data: Partial<MiNote> = {}, time?: number) {
+		const id = time == null ? ctx.idService.gen() : ctx.idService.gen(time);
+		const note = await ctx.notesRepository
+			.insert({
+				id,
+				text: 'hello',
+				userId: user.id,
+				userHost: user.host,
+				visibility: 'public',
+				tags: [],
+				...data,
+			})
+			.then(x => ctx.notesRepository.findOneByOrFail(x.identifiers[0]));
+
+		if (ctx.indexer) {
+			await ctx.indexer(note);
+		}
+
+		return note;
+	}
+
+	async function createFollowing(ctx: TestContext, follower: MiUser, followee: MiUser) {
+		await ctx.followingsRepository.insert({
+			id: ctx.idService.gen(),
+			followerId: follower.id,
+			followeeId: followee.id,
+			followerHost: follower.host,
+			followeeHost: followee.host,
+		});
+	}
+
+	function clearUserCaches(ctx: TestContext, userId: MiUser['id']) {
+		ctx.cacheService.userMutingsCache.delete(userId);
+		ctx.cacheService.userBlockedCache.delete(userId);
+		ctx.cacheService.userBlockingCache.delete(userId);
+	}
+
+	async function createMuting(ctx: TestContext, muter: MiUser, mutee: MiUser) {
+		await ctx.mutingsRepository.insert({
+			id: ctx.idService.gen(),
+			muterId: muter.id,
+			muteeId: mutee.id,
+		});
+		clearUserCaches(ctx, muter.id);
+	}
+
+	async function createBlocking(ctx: TestContext, blocker: MiUser, blockee: MiUser) {
+		await ctx.blockingsRepository.insert({
+			id: ctx.idService.gen(),
+			blockerId: blocker.id,
+			blockeeId: blockee.id,
+		});
+		clearUserCaches(ctx, blocker.id);
+		clearUserCaches(ctx, blockee.id);
+	}
+
+	function defineSearchNoteTests(
+		getCtx: () => TestContext,
+		{
+			supportsFollowersVisibility,
+			sinceIdOrder,
+		}: {
+			supportsFollowersVisibility: boolean;
+			sinceIdOrder: 'asc' | 'desc';
+		},
+	) {
+		describe('searchNote', () => {
+			test('filters notes by visibility (followers only visible to followers)', async () => {
+				const ctx = getCtx();
+				const me = await createUser(ctx, { username: 'me', usernameLower: 'me', host: null });
+				const author = await createUser(ctx, { username: 'author', usernameLower: 'author', host: null });
+
+				const publicNote = await createNote(ctx, author, { text: 'hello public', visibility: 'public' });
+				const followersNote = await createNote(ctx, author, { text: 'hello followers', visibility: 'followers' });
+
+				const beforeFollow = await ctx.service.searchNote('hello', me, {}, { limit: 10 });
+				expect(beforeFollow.map(note => note.id)).toEqual([publicNote.id]);
+
+				await createFollowing(ctx, me, author);
+
+				const afterFollow = await ctx.service.searchNote('hello', me, {}, { limit: 10 });
+				const expectedIds = supportsFollowersVisibility
+					? [followersNote.id, publicNote.id]
+					: [publicNote.id];
+				expect(afterFollow.map(note => note.id).sort()).toEqual(expectedIds.sort());
+			});
+
+			test('filters out suspended users via base note filtering', async () => {
+				const ctx = getCtx();
+				const me = await createUser(ctx, { username: 'me', usernameLower: 'me', host: null });
+				const active = await createUser(ctx, { username: 'active', usernameLower: 'active', host: null });
+				const suspended = await createUser(ctx, { username: 'suspended', usernameLower: 'suspended', host: null, isSuspended: true });
+
+				const activeNote = await createNote(ctx, active, { text: 'hello active', visibility: 'public' });
+				await createNote(ctx, suspended, { text: 'hello suspended', visibility: 'public' });
+
+				const result = await ctx.service.searchNote('hello', me, {}, { limit: 10 });
+				expect(result.map(note => note.id)).toEqual([activeNote.id]);
+			});
+
+			test('filters by userId', async () => {
+				const ctx = getCtx();
+				const me = await createUser(ctx, { username: 'me', usernameLower: 'me', host: null });
+				const alice = await createUser(ctx, { username: 'alice', usernameLower: 'alice', host: null });
+				const bob = await createUser(ctx, { username: 'bob', usernameLower: 'bob', host: null });
+
+				const aliceNote = await createNote(ctx, alice, { text: 'hello alice', visibility: 'public' });
+				await createNote(ctx, bob, { text: 'hello bob', visibility: 'public' });
+
+				const result = await ctx.service.searchNote('hello', me, { userId: alice.id }, { limit: 10 });
+				expect(result.map(note => note.id)).toEqual([aliceNote.id]);
+			});
+
+			test('filters by channelId', async () => {
+				const ctx = getCtx();
+				const me = await createUser(ctx, { username: 'me', usernameLower: 'me', host: null });
+				const author = await createUser(ctx, { username: 'author', usernameLower: 'author', host: null });
+				const channelA = await createChannel(ctx, author, { name: 'channel-a' });
+				const channelB = await createChannel(ctx, author, { name: 'channel-b' });
+
+				const channelNote = await createNote(ctx, author, { text: 'hello channel', channelId: channelA.id, visibility: 'public' });
+				await createNote(ctx, author, { text: 'hello other', channelId: channelB.id, visibility: 'public' });
+
+				const result = await ctx.service.searchNote('hello', me, { channelId: channelA.id }, { limit: 10 });
+				expect(result.map(note => note.id)).toEqual([channelNote.id]);
+			});
+
+			test('filters by host', async () => {
+				const ctx = getCtx();
+				const me = await createUser(ctx, { username: 'me', usernameLower: 'me', host: null });
+				const local = await createUser(ctx, { username: 'local', usernameLower: 'local', host: null });
+				const remote = await createUser(ctx, { username: 'remote', usernameLower: 'remote', host: 'example.com' });
+
+				const localNote = await createNote(ctx, local, { text: 'hello local', visibility: 'public' });
+				const remoteNote = await createNote(ctx, remote, { text: 'hello remote', visibility: 'public', userHost: 'example.com' });
+
+				const localResult = await ctx.service.searchNote('hello', me, { host: '.' }, { limit: 10 });
+				expect(localResult.map(note => note.id)).toEqual([localNote.id]);
+
+				const remoteResult = await ctx.service.searchNote('hello', me, { host: 'example.com' }, { limit: 10 });
+				expect(remoteResult.map(note => note.id)).toEqual([remoteNote.id]);
+			});
+
+			describe('muting and blocking', () => {
+				test('filters out muted users', async () => {
+					const ctx = getCtx();
+					const me = await createUser(ctx, { username: 'me', usernameLower: 'me', host: null });
+					const muted = await createUser(ctx, { username: 'muted', usernameLower: 'muted', host: null });
+					const other = await createUser(ctx, { username: 'other', usernameLower: 'other', host: null });
+
+					await createNote(ctx, muted, { text: 'hello muted', visibility: 'public' });
+					const otherNote = await createNote(ctx, other, { text: 'hello other', visibility: 'public' });
+
+					await createMuting(ctx, me, muted);
+
+					const result = await ctx.service.searchNote('hello', me, {}, { limit: 10 });
+
+					expect(result.map(note => note.id)).toEqual([otherNote.id]);
+				});
+
+				test('filters out users who block me', async () => {
+					const ctx = getCtx();
+					const me = await createUser(ctx, { username: 'me', usernameLower: 'me', host: null });
+					const blocker = await createUser(ctx, { username: 'blocker', usernameLower: 'blocker', host: null });
+					const other = await createUser(ctx, { username: 'other', usernameLower: 'other', host: null });
+
+					await createNote(ctx, blocker, { text: 'hello blocker', visibility: 'public' });
+					const otherNote = await createNote(ctx, other, { text: 'hello other', visibility: 'public' });
+
+					await createBlocking(ctx, blocker, me);
+
+					const result = await ctx.service.searchNote('hello', me, {}, { limit: 10 });
+
+					expect(result.map(note => note.id)).toEqual([otherNote.id]);
+				});
+
+				test('filters no out users I block', async () => {
+					const ctx = getCtx();
+					const me = await createUser(ctx, { username: 'me', usernameLower: 'me', host: null });
+					const blocked = await createUser(ctx, { username: 'blocked', usernameLower: 'blocked', host: null });
+					const other = await createUser(ctx, { username: 'other', usernameLower: 'other', host: null });
+
+					const blockedNote = await createNote(ctx, blocked, { text: 'hello blocked', visibility: 'public' });
+					const otherNote = await createNote(ctx, other, { text: 'hello other', visibility: 'public' });
+
+					await createBlocking(ctx, me, blocked);
+
+					const result = await ctx.service.searchNote('hello', me, {}, { limit: 10 });
+					expect(result.map(note => note.id).sort()).toEqual([otherNote.id, blockedNote.id].sort());
+				});
+			});
+
+			describe('pagination', () => {
+				test('paginates with sinceId', async () => {
+					const ctx = getCtx();
+					const me = await createUser(ctx, { username: 'me', usernameLower: 'me', host: null });
+					const author = await createUser(ctx, { username: 'author', usernameLower: 'author', host: null });
+
+					const t1 = Date.now() - 3000;
+					const t2 = Date.now() - 2000;
+					const t3 = Date.now() - 1000;
+
+					const note1 = await createNote(ctx, author, { text: 'hello' }, t1);
+					const note2 = await createNote(ctx, author, { text: 'hello' }, t2);
+					const note3 = await createNote(ctx, author, { text: 'hello' }, t3);
+
+					const result = await ctx.service.searchNote('hello', me, {}, { limit: 10, sinceId: note1.id });
+
+					const expected = sinceIdOrder === 'asc'
+						? [note2.id, note3.id]
+						: [note3.id, note2.id];
+					expect(result.map(note => note.id)).toEqual(expected);
+				});
+
+				test('paginates with untilId', async () => {
+					const ctx = getCtx();
+					const me = await createUser(ctx, { username: 'me', usernameLower: 'me', host: null });
+					const author = await createUser(ctx, { username: 'author', usernameLower: 'author', host: null });
+
+					const t1 = Date.now() - 3000;
+					const t2 = Date.now() - 2000;
+					const t3 = Date.now() - 1000;
+
+					const note1 = await createNote(ctx, author, { text: 'hello' }, t1);
+					const note2 = await createNote(ctx, author, { text: 'hello' }, t2);
+					const note3 = await createNote(ctx, author, { text: 'hello' }, t3);
+
+					const result = await ctx.service.searchNote('hello', me, {}, { limit: 10, untilId: note3.id });
+
+					expect(result.map(note => note.id)).toEqual([note2.id, note1.id]);
+				});
+
+				test('paginates with sinceId and untilId together', async () => {
+					const ctx = getCtx();
+					const me = await createUser(ctx, { username: 'me', usernameLower: 'me', host: null });
+					const author = await createUser(ctx, { username: 'author', usernameLower: 'author', host: null });
+
+					const t1 = Date.now() - 4000;
+					const t2 = Date.now() - 3000;
+					const t3 = Date.now() - 2000;
+					const t4 = Date.now() - 1000;
+
+					const note1 = await createNote(ctx, author, { text: 'hello' }, t1);
+					const note2 = await createNote(ctx, author, { text: 'hello' }, t2);
+					const note3 = await createNote(ctx, author, { text: 'hello' }, t3);
+					const note4 = await createNote(ctx, author, { text: 'hello' }, t4);
+
+					const result = await ctx.service.searchNote('hello', me, {}, { limit: 10, sinceId: note1.id, untilId: note4.id });
+
+					expect(result.map(note => note.id)).toEqual([note3.id, note2.id]);
+				});
+			});
+		});
+	}
+
+	describe('sqlLike', () => {
+		let ctx: TestContext;
+
+		beforeAll(async () => {
+			ctx = await buildContext();
+		});
+
+		afterAll(async () => {
+			await ctx.app.close();
+		});
+
+		afterEach(async () => {
+			await cleanupContext(ctx);
+		});
+
+		defineSearchNoteTests(() => ctx, { supportsFollowersVisibility: true, sinceIdOrder: 'asc' });
+	});
+
+	describe('meilisearch', () => {
+		let ctx: TestContext;
+		let meilisearch: MeiliSearch;
+		let meilisearchIndex: Index;
+		let meiliConfig: Config;
+
+		beforeAll(async () => {
+			const baseConfig = loadConfig();
+			meiliConfig = {
+				...baseConfig,
+				fulltextSearch: {
+					provider: 'meilisearch',
+				},
+				meilisearch: {
+					host: '127.0.0.1',
+					port: '57712',
+					apiKey: '',
+					index: 'test-search-service',
+					scope: 'global',
+					ssl: false,
+				},
+			};
+
+			ctx = await buildContext(meiliConfig);
+			meilisearch = ctx.app.get(DI.meilisearch) as MeiliSearch;
+			meilisearchIndex = meilisearch.index(`${meiliConfig.meilisearch!.index}---notes`);
+
+			const settingsTask = await meilisearchIndex.updateSettings(meilisearchSettings);
+			await meilisearch.tasks.waitForTask(settingsTask.taskUid);
+
+			const clearTask = await meilisearchIndex.deleteAllDocuments();
+			await meilisearch.tasks.waitForTask(clearTask.taskUid);
+
+			ctx.indexer = async (note: MiNote) => {
+				if (note.text == null && note.cw == null) return;
+				if (!['home', 'public'].includes(note.visibility)) return;
+				if (meiliConfig.meilisearch?.scope === 'local' && note.userHost != null) return;
+
+				const task = await meilisearchIndex.addDocuments([{
+					id: note.id,
+					createdAt: ctx.idService.parse(note.id).date.getTime(),
+					userId: note.userId,
+					userHost: note.userHost,
+					channelId: note.channelId,
+					cw: note.cw,
+					text: note.text,
+					tags: note.tags,
+				}], {
+					primaryKey: 'id',
+				});
+				await meilisearch.tasks.waitForTask(task.taskUid);
+			};
+		});
+
+		afterAll(async () => {
+			await ctx.app.close();
+		});
+
+		afterEach(async () => {
+			await cleanupContext(ctx);
+			const clearTask = await meilisearchIndex.deleteAllDocuments();
+			await meilisearch.tasks.waitForTask(clearTask.taskUid);
+		});
+
+		defineSearchNoteTests(() => ctx, { supportsFollowersVisibility: false, sinceIdOrder: 'desc' });
+	});
+});