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Actually each and every keyword research tool is different and they all will produce different accuracy and result. But i think Keysearch is one of the best tool with great accuracy.

I always use keysearch for my SEO purpose. This is working properly for me. And i have not faced any problem in that.

keyword revealer is the best tool for finding the accurate keyword competition.

I have been using keysearch for so many years now for SEO purpose. And this is working really very great.

Here i have given some keyword research tools and their uses. You can select one from these and make use of it.
SEMRush uses an algorithm to estimate their traffic (source: spoke with them at a conference in 2016).
ahrefs uses a third party to get click stream data and pairs it with data from Google (source: help content)
MOZ uses a third party to get their Google data and click stream data (source: spoke with team).
KWFinder reports that their data is the same as Google Keyword Planner (source: their blog).
Twinword Ideas actually gets their data directly from Google (source: I work there).

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keywordtool io is one of the simplest and the best in my opinion :)

yes, 'keywordtool .io' is the best in my opinion.

Serpstat is one of the best keyword research tool which gives great accuracy in the keyword competition.

Keywords are one of the most critical and important parts of SEO. The keywords you choose to focus on for your search engine optimization (SEO) efforts are critical to the success of your website’s rank.

Choosing the right keywords isn’t always easy or intuitive and you need a lot of data to know whether a given keyword will work for you. If you are completely new to keyword research tools and the process of keyword research, here are some guides from the past which will help you understand the basics:

Importance of Keywords in SEO
Keyword Research for Beginner’s Using the Google Keyword Planner Tool. So now you know the basics of keyword research and you have an understanding of how valuable it can be. Fortunately, there are many tools available that can help you figure out which keywords work the best for your overall web strategy. There are mostly two types of Keyword research tool:

Basic Keyword research: Use the seed Keyword to find profitable Keywords Competitor based Keyword research: Find proven keywords which are helping other sites to drive traffic.

Here are the list of tools listed below:

Google Keyword Planner
SEMRUSH
Ahrefs
LongTailPro
KWFinder
SpyFU
SERPStat