diff --git a/maigret/executors.py b/maigret/executors.py
new file mode 100644
index 0000000..f2695d5
--- /dev/null
+++ b/maigret/executors.py
@@ -0,0 +1,119 @@
+import asyncio
+import time
+import tqdm
+import sys
+from typing import Iterable
+
+from .types import QueryDraft
+
+
+def create_task_func():
+    if sys.version_info.minor > 6:
+        create_asyncio_task = asyncio.create_task
+    else:
+        loop = asyncio.get_event_loop()
+        create_asyncio_task = loop.create_task
+    return create_asyncio_task
+
+
+class AsyncExecutor:
+    def __init__(self, *args, **kwargs):
+        self.logger = kwargs['logger']
+
+    async def run(self, tasks: Iterable[QueryDraft]):
+        start_time = time.time()
+        results = await self._run(tasks)
+        self.execution_time = time.time() - start_time
+        self.logger.debug(f'Spent time: {self.execution_time}')
+        return results
+
+    async def _run(self, tasks: Iterable[QueryDraft]):
+        await asyncio.sleep(0)
+
+
+class AsyncioSimpleExecutor(AsyncExecutor):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+    async def _run(self, tasks: Iterable[QueryDraft]):
+        futures = [f(*args, **kwargs) for f, args, kwargs in tasks]
+        return await asyncio.gather(*futures)
+
+
+class AsyncioProgressbarExecutor(AsyncExecutor):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+    async def _run(self, tasks: Iterable[QueryDraft]):
+        futures = [f(*args, **kwargs) for f, args, kwargs in tasks]
+        results = []
+        for f in tqdm.asyncio.tqdm.as_completed(futures):
+            results.append(await f)
+        return results
+
+
+class AsyncioProgressbarSemaphoreExecutor(AsyncExecutor):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.semaphore = asyncio.Semaphore(kwargs.get('in_parallel', 1))
+
+    async def _run(self, tasks: Iterable[QueryDraft]):
+        async def _wrap_query(q: QueryDraft):
+            async with self.semaphore:
+                f, args, kwargs = q
+                return await f(*args, **kwargs)
+
+        async def semaphore_gather(tasks: Iterable[QueryDraft]):
+            coros = [_wrap_query(q) for q in tasks]
+            results = []
+            for f in tqdm.asyncio.tqdm.as_completed(coros):
+                results.append(await f)
+            return results
+
+        return await semaphore_gather(tasks)
+
+
+class AsyncioProgressbarQueueExecutor(AsyncExecutor):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.workers_count = kwargs.get('in_parallel', 10)
+        self.progress_func = kwargs.get('progress_func', tqdm.tqdm)
+        self.queue = asyncio.Queue(self.workers_count)
+        self.timeout = kwargs.get('timeout')
+
+    async def worker(self):
+        while True:
+            try:
+                f, args, kwargs = self.queue.get_nowait()
+            except asyncio.QueueEmpty:
+                return
+
+            query_future = f(*args, **kwargs)
+            query_task = create_task_func()(query_future)
+            try:
+                result = await asyncio.wait_for(query_task, timeout=self.timeout)
+            except asyncio.TimeoutError:
+                result = None
+
+            self.results.append(result)
+            self.progress.update(1)
+            self.queue.task_done()
+
+    async def _run(self, queries: Iterable[QueryDraft]):
+        self.results = []
+
+        queries_list = list(queries)
+
+        min_workers = min(len(queries_list), self.workers_count)
+
+        workers = [create_task_func()(self.worker())
+                   for _ in range(min_workers)]
+
+        self.progress = self.progress_func(total=len(queries_list))
+        for t in queries_list:
+            await self.queue.put(t)
+        await self.queue.join()
+        for w in workers:
+            w.cancel()
+        self.progress.close()
+        return self.results
diff --git a/maigret/types.py b/maigret/types.py
new file mode 100644
index 0000000..25e539d
--- /dev/null
+++ b/maigret/types.py
@@ -0,0 +1,28 @@
+from typing import Callable, Any, Tuple
+
+
+# search query
+QueryDraft = Tuple[Callable, Any, Any]
+
+# error got as a result of completed search query
+class CheckError:
+    _type = 'Unknown'
+    _desc = ''
+
+    def __init__(self, typename, desc=''):
+        self._type = typename
+        self._desc = desc
+
+    def __str__(self):
+        if not self._desc:
+            return f'{self._type} error'
+
+        return f'{self._type} error: {self._desc}'
+
+    @property
+    def type(self):
+        return self._type
+    
+    @property
+    def desc(self):
+        return self._desc