Hearthstone, Blizzard Entertainment's (hereafter Blizzard) only hit on mobile under Microsoft (MS), has been unable to shake off its decline. Launched in 2014 as a strategy card game set in the Warcraft universe, it surpassed 100 million cumulative global users as of 2018 and became Blizzard's symbol on mobile, but its stature has been badly shaken as user metrics at home and abroad and its esports drawing power have collapsed at the same time in recent months.
According to the app analytics platform MobileIndex on 1st, Hearthstone mobile's domestic monthly active users (MAU) fell from 205,439 in Aug. 2021 to 93,507 in Aug. 2025. In just four years, it decreased by more than half. Right after the release of a new expansion in Mar. this year, it briefly jumped to 165,281, but in four months it dropped by nearly 40%, breaking below the 100,000 mark. Aside from event-driven temporary rebounds, the downtrend has effectively become structural.
Released in 2014, Hearthstone is virtually the only title that Blizzard developed in-house and delivered long-term results with on PC and mobile platforms. While it built a global stature with PC franchises such as StarCraft, Diablo, and World of Warcraft, it failed to produce notable results on mobile. Diablo Immortal, co-developed with NetEase and released in Jun. 2022, surpassed $100 million in global revenue within a month of launch, but it failed to sustain long-term success due to pay-to-win controversy. Warcraft Rumble, released in 2023, effectively entered the shutdown phase as development of new content was fully halted in Jul.
According to the global esports data site Esports Charts, peak concurrent viewership for the Hearthstone World Championship reached 328,000 in 2016 but shrank to about 38,000 in 2024. New user inflows are also showing only brief spikes around expansion releases. According to mobile marketing analytics firm Udonis, Hearthstone's global downloads surged to 980,000 in Sep. 2024 and 890,000 in Oct., but in just four months, by Feb. this year, they plunged to around 200,000. After that, even in Jun. 4th, they remained at 210,000, indicating a pattern in which a brief rise is followed by an entrenched long-term decline.
Industry watchers cite as reasons for Hearthstone's downturn: ▲ fatigue from an expansion pack-centered monetization structure ▲ contraction of esports scale and a weakened pro scene ▲ intensifying competition in the mobile market ▲ declining trust in the Blizzard brand. In particular, as the card pool (the number of owned cards) has grown excessively large, the entry barrier for new users has risen, and even existing users are said to feel fatigue with the repetitive meta.
Hearthstone aims for a rebound with the new expansion, "Beyond the Paths of Time," set for release on Nov. 5. It adds 145 new cards and a keyword system, but industry assessments are largely that "it may bring back users in the short term but is unlikely to change the long-term growth trajectory." Injecting new content alone is unlikely to reverse a structural decline.
Hearthstone's struggles are directly tied to Blizzard's crisis. Diablo IV saw its concurrent users on Steam fall below 10,000 within a year of launch, and Overwatch 2's share remains in the 5% range, trailing Riot Games' Valorant. StarCraft and Heroes of the Storm have already vanished from the esports scene. With new IPs effectively gone and only remasters and expansions repeating, there is a growing refrain that Blizzard's creative development capacity has been depleted.
Blizzard appeared to be entering a new phase after being acquired by Microsoft (MS) in 2023, but contrary to expectations, uncertainty has grown. An unannounced new project was canceled, and key personnel, including President Mike Ybarra, departed in large numbers. Events for the 30th anniversary of Warcraft and the 20th anniversary of World of Warcraft passed quietly, and even BlizzCon, a symbolic event, was postponed to 2026.
"The core developers who led Blizzard's heyday have already left the company, and the Blizzard of today has become a completely different company," said a gaming industry source. "The current path of sustaining itself only with remasters and expansions is far removed from the image of Blizzard that once led the market with innovation and creativity."