21 Blitz

Developer: 🇺🇸 Tether Studios LLC

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209K installs

599 ratings

MAU not available

Revenue not available

Install Trends

Weekly +84

Steady

Monthly +148

Steady

21 Blitz Summary

21 Blitz is a free, ad-supported, with in-app purchases Android app in Card by Tether Studios LLC. Released in Apr 2021 (5 years ago). It has about 209K+ installs and 599 ratings with a 3.67★ (average) average. Store last updated Aug 1, 2026

Recent activity: 84 installs this week (148 over 4 weeks) View trends →

Advertising: AppGoblin detected 1.00 monetized ad creatives shown inside the app.

SDK intelligence: AppGoblin detected 6 development tools(e.g. Unity), 2 analytics: product, 2 ad networks,and 1 analytics: attribution integrated into 21 Blitz. View full SDK list →

Data tracking: The app's network data flows (API traffic to/from the app and its SDKs) were last crawled on Nov 14, 2025.

21 Blitz SDKs Summary

21 Blitz was last scanned for SDKs on 2025-10-15. Below is the overview of third-party companies detected in the app. The full list of SDKs, permissions and unknowns is available here.

App Details

Store ID: com.tetherstudios.blitz21practice

First Released: 2021-04-16

Store Last Updated: 2026-08-01

App Store Category: Games: Card

In-App Purchases: Yes

Ads: Yes

Price: Paid

Website: tetherstudios.com

App Store

Crawl Status: Success

AppGoblin First Crawled: 2022-09-11

AppGoblin Last Crawled: 2026-08-15

Ads & App-Ads.txt

Ads.txt Last Crawled: 2025-10-12

Ads.txt Crawl Status: Success

3.67★

Ratings: 599

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Screenshots

App Description

Practice your classic Blackjack skills in a modern version of the card game.

Blackjack strategy at lightning speed!

21 Blitz blends blackjack strategy with quick thinking in a fast-paced race for the highest score. Every match challenges you to build 21s, create scoring streaks, and outplay your opponents before time runs out. Every decision matters as you balance speed and strategy.

How to Play
Build 21s and 5-card stacks for big points while managing all four hands at once. Clear stacks back-to-back to earn streak bonuses and keep track of the cards in the full deck to maximize your score.

Compete with Friends
Invite your friends, compete head-to-head, and see who can claim the top spot. Every game uses a full deck, rewarding smart decisions, careful card tracking, and skilled play.

Why You'll Love 21 Blitz
- Fast-paced competition
- Head-to-head matches with friends
- Strategic card tracking
- Rewarding streak bonuses

Download 21 Blitz today and see if you have what it takes to come out on top.