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New users can take advantage of the top NFL DFS promotions and odds boosts from sites like Underdog Fantasy, Sleeper, Betr, Pick6, Boom, ParlayPlay, Dabble and Playsqor on Sunday, Dec. 21, as NFL Week 16 continues. There are no byes in Week 16, so even though there were two games on Saturday, there are still 13 to come on Sunday. Some of the most notable matchups are Cowboys vs. Chargers, Jaguars vs. Broncos, Steelers vs. Lions and Ravens vs. Patriots on 'Sunday Night Football.' Here's a look at some of the top NFL promo codes for parlay sites like Underdog FantasySleeper and ParlayPlay on Saturday:

Promos for Underdog Fantasy, Betr, Boom, ParlayPlay, Sleeper, Pick6, Dabble, Playsqor

Here's a look at the promo codes being offered by best DFS apps like Underdog Fantasy, Sleeper and ParlayPlay.

SiteBonus Offer  Promo Code
Underdog FantasyPlay $5, Get $75CBSPORTS2
Sleeper100% deposit match up to $100CBSSPORTS
ParlayPlay100% deposit match up to $100 + a $5 entry ticketCBSSPORTS
betr$10 in Betr Bucks and 50% up to $200 deposit match CBSSPORTS
Boom Fantasy$100 first entry refundJust click here
DraftKings Pick6New players play $5 on first paid entry, get $50 in Pick6 creditsJust click here
DabbleNew users get $25 in site creditCBSDAB
Playsqor100% deposit match up to $100CBSSPORTS

Top DFS app picks for Dec. 21

One of the top NFL prop picks at Underdog Fantasy is Bengals quarterback Joe Burrow to go higher than 23.5 passing completions vs. the Dolphins. Burrow has cleared his completions line in three of his past five games, and he takes on a Miami secondary that struggled against Aaron Rodgers and the Steelers last week. SportsLine's model is projecting 32.6 completions for Burrow, making this a 5-star pick from the model. 

At Betr, one of the top picks is Bucs quarterback Baker Mayfield going lower than 20.5 completions. He's fallen short on his completions line in five straight games, averaging just 15.2 during that span. The model has him completing just 13.9 against the Panthers on Sunday, leaving him well short of this total, making it another 5-star pick. 

Betr: Get $10 in Betr Bucks upon registration and 50% up to $200 deposit match 

Click here and use the promo code CBSSPORTS to get $10 in Betr Bucks upon registration and 50% up to $200 deposit match with the latest Betr Picks promo code.

Boom Fantasy: $100 First entry refund

New users can click here and get a risk-free entry up to $100 in Boom Fantasy bonus funds if your pick loses with the latest Boom Fantasy promo code.

DraftKings Pick6: Play $5 on First Paid Entry, Get $50 in Pick6 Credits

New users can click here and make an initial play of $5 or more on first paid entry at DraftKings Pick6 and then get $50 credit in Pick6 credits with the latest DraftKings Pick6 promo code:

ParlayPlay: 100% deposit match up to $100 + a $5 entry ticket

Get started by clicking here, and get a first deposit match of up to $100 and a free $5 contest entry with the latest ParlayPlay promo code:

Sleeper: 100% deposit match up to $100

Click here and use the Sleeper bonus code CBSSPORTS to receive this bonus from Sleeper, which is offered in the form of site credits. 

Underdog Fantasy: Play $5, get $75 in bonus entries

Click here to get started using the Underdog Fantasy bonus code CBSSPORTS2, which offers new users $75 in bonus entries when they enter a $5 (or higher) contest. 

Dabble Fantasy: New users get $25 sign-up bonus

New users can click here and use the Dabble promo code CBSDAB to get a $25 bonus, which comes in the form of site credits.

Playsqor: 100% deposit match up to $100

Click here to use the Playsqor promo code CBSSPORTS, which gives new users a 100% deposit match up to $100.

Responsible gaming

Responsible gambling is taken very seriously across all contest sites. All provide the necessary resources and contact information if you or someone you know may have a gambling problem. The minimum age is 18 for these sites in most states, but it is 19 or older in Alabama and Nebraska and 21 or older in Massachusetts. 

Responsible gambling resources include the National Council for Problem Gambling (NCPG) and Gamblers Anonymous.

Be smart. Bet smart. Wager responsibly. Those in need of help can also call or text 1-800-GAMBLER (1-800-426-2537). Help is available 24 hours per day and seven days per week.