Reviewing your competitor’s ads is a great way to get insights into what they’re doing. However, that shouldn’t be your primary reason for reviewing said ads. Instead, here are some reasons for why (and how!) you can watch your competitors' ads on Google, Instagram, Facebook, LinkedIn YouTube:

To find out what, where and how your competitors are promoting: For instance, many B2B companies promote free content instead of products/services to get lead contact information. They then nurture the leads to make a sale instead of selling it outright.
To stay ahead of the curve: Top competitors do not promote outdated products and services. By reviewing their ads, you can understand the mood of the target audience through messages and pictures.
To differentiate yourself: Generic terms like "profitable conditions", "100% quality", and "highly qualified specialists" will get you lost in the feed amongst your competitors.
To avoid repeating mistakes: Finding flaws in your competitors' ads can be a great way to avoid them in yours.
To do better by taking advantage of weaknesses in your competitors' advertising strategy.

Google Ads

Step 1 - Find your competitor on Google and click on the three dots on its ad.

Step 2 - Click “See more ads”

Step 3 - enjoy 😊. Use the filters to see what ads are showing in certain countries.

Facebook and Instagram Ads

Step 1 - Go to a competitor's FB page, find Page transparency and click “See All”.

Step 2 - Click “Go to the ad library”.

Step 3 - enjoy😊 You may use filters and click on ads to see URLs.

You can see summary results for past ads, including the amount of spend, impressions, and who saw the ad and in which geographic region.

😃 Also, you can search by keywords and see all ads.

LinkedIn Ads

Step 1 - Go to the brand page.

Step 2- Click “Posts” and choose “Ads”, and you will see all of a company’s ads.

Free Life Hacks to Spy On Your Competitor’s Ads

Google Ads

Facebook and Instagram Ads

LinkedIn Ads

How to share YouTube video ads