Set a global how much product to buy to set how much of free quantity
You can specify the amount of free product given on global level
It adds the same product as free product (you can add other product as free product in the PRO version)
You can enable BOGO deal on specific product

Pro version

Buy Pro version for $25

It allows you to set the buy quantity for each product differently
Offer the BOGO Deal product as Free or At Discounted price
Set free quantity differently for each product
It allows you to offer other product as free product instead of giving the same product as free
You can set a message on the single product page, to describe the offer
You can customize the message shown for each product in your own wordings
List of short code that you can use as place holder while making offer message [free_name], [buy_quantity], [free_quantity], [free_price], [start_date_time], [end_date_time], [start_date], [end_date], [start_time], [end_time]
You can show different parameter of the offer in the message using the short code
Set a offer start and end time, you can set this different for each product
Set a message that will be shown before the offer start, you can set this different for each product
Set different message to show when the offer has started, you can set this different for each product
Set maximum quantity of free product that can be offered with parent product.
Say 1 unit of Product A gives 1 unit of B and max quantity is 2 then, when you add 3 unit of A the quantity of Free B will be kept at 2 only as Max quantity is 2 (without max quantity restriction it would have been 3)
Create BOGO or Buy X get Y free offer on the Category level, so you don’t have to create this offer on an individual product basis
Run category level rule on specif days of the week
Exclude a product or a variation from a category level BOGO offer
Overwrite the BOGO on category level with an separate rule for the product on product level rule
You can run offer for all the variation of variable product
Restrict the offer to run for some specific variation for a variable product
Offer info will only show when the buyer selects a variation that has the offer, if he selects some other variation that don’t have offer, the message box will disappear
Offer different product as Free product with each of the variation in a variable product
Show category level offer message on the respective category pages
Give option to the customer to remove the free product from the cart (incase they don’t want to receive the free product)
If the free product is a variable product then you can allow customer to change the variation of the free product in the cart or on checkout page
You can give option to the customer to select a free product from list of products, (you have to make the list of product that you will like to offer them for selection). Initially one product will be added to cart or free and will be given a option to change the free product (if you have given a list of alternate free products)
You can make the alternate free product to be always less then the price of the product added by the customer in the cart, That is making the BOGO offer (this applied in the category based BOGO rules)
You can control how many times a customer can avail the offer, you can set a limit on the number of time a customer can avail the offer. Say you have set the limit to 2 on the category X bogo rule, then the customer A can avail the offer only 2 times, after that the offer will not be applied for that customer A, but customer B can get the offer 2 times as well, so the limit is per customer not for all the customer. Customer A can get the benifit of the offer set on some other category B.

Full control over variable product BOGO offer

Select the variation that you want to have the BOGO offer and keep other variation out of the bogo offer using product level rule
Offer different product as free product with each of the variations
Set different buy quantity, Free product quantity, Max free product limit for each variation
Set different start time and end time for the variation
Set different message for each variation

Difference between the 3 category level rules

Buy product A and get product B Free

E.g: Category A has product –> B, C

Free product –> D
Free unit –> 1
Max limit –> 2

2 x B he will get 2 unit of D
3 x C he will get 2 unit of D

Buy product A and get product A Free

E.g: Category A has product –> B, C

Free unit –> 1
Max limit –> 2

2 x B he will get 2 unit of B
3 x C he will get 2 unit of C

Buy product from category get product B Free

E.g: Category A has product –> B, C

Free product –> D
Free unit –> 1
Max limit –> 3

2 x B he will get 2 unit of D
3 x C he will get 1 unit of D