Unity (game engine)

Unity 1.0 (2005)

The Unity game engine was launched in 2005, aiming to "democratize" game development by making it accessible to more developers.[5][8] It was shown at Worldwide Developers Conference 2005 by Scott Forstall on Mac OS X.[9] The next year, Unity was named runner-up in the Best Use of Mac OS X Graphics category in Apple Inc.'s Apple Design Awards.[10] Unity was initially released for Mac OS X, later adding support for Microsoft Windows and Web browsers.[11]

Unity 2.0 (2007)

Unity 2.0 launched in 2007 with approximately 50 new features. DirectX support was added in 2.0.[12] The release included an optimized terrain engine for detailed 3D environments, real-time dynamic shadows, directional lights and spotlights, video playback, and other features.[12] The release also added a version control system to allow developers to collaborate more easily.[12] It included a Networking Layer for developers to create multiplayer games based on the User Datagram Protocol, offering Network Address Translation, State Synchronization, and Remote Procedure Calls.[12] When Apple launched its App Store in 2008, Unity added support for the iPhone.[11] Unity 2.5, released in March 2009, added editor support for Windows.[13]

Unity 3.0 (2010)

Unity 3.0 launched in September 2010 with features expanding the engine's graphics features for desktop computers and video game consoles.[14] In addition to Android support, Unity 3 featured integration of Illuminate Labs' Beast Lightmap tool, deferred rendering, a built-in tree editor, native font rendering, automatic UV mapping, and audio filters, among other features.[14] In 2012, VentureBeat wrote, "Few companies have contributed as much to the flowing of independently produced games as Unity Technologies. [...] More than 1.3 million developers are using its tools to create gee-whiz graphics in their iOS, Android, console, PC, and web-based games. Unity wants to be the engine for multi-platform games, period."[15] A May 2012 survey by Game Developer magazine indicated Unity as its top game engine for mobile platforms.[16]

Unity 4.0 (2012)

In November 2012, Unity Technologies delivered Unity 4.0.[17] This version added DirectX 11 and Adobe Flash support, new animation tools called Mecanim, and access to the Linux preview.[17]

Facebook integrated a software development kit for games using the Unity game engine in 2013.[18] This featured tools that allowed tracking advertising campaigns and deep linking, where users were directly linked from social media posts to specific portions within games, and easy in-game-image sharing.[18] In 2016, Facebook developed a new PC gaming platform with Unity.[19] Unity provided support for Facebook's gaming platforms, and Unity developers could more quickly export and publish games to Facebook.[19]

Unity 5 (2015)

The Verge said of 2015's Unity 5 release: "Unity started with the goal of making game development universally accessible. [...] Unity 5 is a long-awaited step towards that future."[20] With Unity 5, the engine improved its lighting and audio.[21] Through WebGL, Unity developers could add their games to compatible Web browsers with no plug-ins required for players.[21] Unity 5.0 offered real-time global illumination, light mapping previews, Unity Cloud, a new audio system, and the Nvidia PhysX 3.3 physics engine.[21] The fifth generation of the Unity engine also introduced Cinematic Image Effects to help make Unity games look less generic.[22] Unity began offering an experimental and unsupported Linux editor build in August 2015.[23] Unity 5.6 added new lighting and particle effects, updated the engine's overall performance, and added native support for Nintendo Switch, Facebook Gameroom, Google Daydream, and the Vulkan graphics API.[24] It introduced a 4K video player capable of running 360-degree videos for virtual reality.[24]

However, some gamers criticized Unity's accessibility due to the high volume of quickly produced games published on the Steam distribution platform by inexperienced developers.[25] Former CEO John Riccitiello said in an interview that he believes this to be a side-effect of Unity's success in democratizing game development: "If I had my way, I'd like to see 50 million people using Unity – although I don't think we're going to get there any time soon. I'd like to see high school and college kids using it, people outside the core industry. I think it's sad that most people are consumers of technology and not creators. The world's a better place when people know how to create, not just consume, and that's what we're trying to promote."[26]

Annual releases (2017–2023)

In December 2016, Unity Technologies announced that they would change the version numbering system for Unity from sequence-based identifiers to year of release to align the versioning with their more frequent release cadence; Unity 5.6 was therefore followed by Unity 2017.[27] Unity 2017 tools featured a real-time graphics rendering engine, color grading and worldbuilding, live operations analytics, and performance reporting.[28] Unity 2017.2 underscored Unity Technologies' plans beyond video games.[28] This included new tools such as Timeline, which allowed developers to drag-and-drop animations into games, and Cinemachine, a smart camera system within games.[28] Unity 2017.2 also integrated Autodesk's 3DS Max and Maya tools into the Unity engine for a streamlined asset-sharing in-game iteration process.[29]

Unity 2018 featured the Scriptable Render Pipeline for developers to create high-end graphics.[30] This included the High-Definition Rendering Pipeline for console and PC experiences, and the Lightweight Rendering Pipeline (later renamed the Universal Render Pipeline[31]) for mobile, virtual reality, and augmented reality.[30] Unity 2018 also included machine learning tools, such as Imitation Learning, whereby games learn from real player habits, support for Magic Leap, and templates for new developers.[30]

Unity Hub,[32] introduced in 2018, streamlines project and engine version management.[33] It replaces manual version switching, centralizing installations, project creation, and licenses.

The C# source code of Unity was published under a "reference-only" license in March 2018, which prohibits reuse and modification.[34] As of 2020, software built with Unity's game engine was running on more than 1.5 billion devices. According to Unity, apps made with their game engine account for 50 percent of all mobile games and are downloaded more than 3 billion times per month, and approximately 15,000 new projects are started daily with its software.[35][36] The Financial Times reported that Unity's engine "powers some of the world's most lucrative mobile games", such as Pokémon Go and Activision's Call of Duty Mobile.[37]

In June 2020, Unity introduced the Mixed and Augmented Reality Studio (MARS), which provides developers with additional functionality for the rules-based generation of augmented reality (AR) applications.[38] Unity released Unity Forma, an automotive and retail solution tool, on December 9, 2020.[39] In June 2020, Unity announced that Unity Editor will support Apple Silicon. The first beta version shipped later that year.[40][41]

Unity 2021 brought multiple new features such as Bolt, Unity's Visual Scripting system, a new multiplayer library to support multiplayer games, improved Il2cpp runtime performance, and Volumetric clouds for the High Definition Render pipeline.[42] Shadow caching and Screen Space Global Illumination for HDRP.[43] For the Universal Render Pipeline, it added new features such as point light shadows, Deferred renderer, and general core engine improvements and fixes.[44][45] Full Apple Silicon support was also added in Unity 2021.2. Unity Hub support for Apple Silicon editors arrived in version 3.0 in January 2022.[46]

Changes to Unity 2022 were intended to improve productivity by reducing the time required to enter play mode and import files and implementing visual search queries and multi-selection in the package manager.[47] For 2D projects, changes focused on accelerating core software, import, animation, and physics. Sprite atlasing was revised. Support for PSD extension files and layer management were added to the 2D PSD Importer, and Delaunay tessellation for 2D physics was added.[47]

Unity 6 (2024)

On November 16, 2023, Unity announced that the next version of the engine would be called Unity 6, reverting to the previous version numbering convention. Unity 6 launched on October 17, 2024, with new features including new generative AI tools, called Unity Muse and Unity Sentis.[48][49] The release introduced new workflows for creating online multiplayer content, performance enhancements for web projects, and improved graphic rendering.[50]

Unity also announced plans for a revised licensing agreement, including a runtime fee (see ).[51] In response to backlash, Unity canceled this runtime fee in September 2024.

Runtime fee controversy

On September 12, 2023, Unity announced that use of the engine would become subject to royalties (referred to as a "runtime fee") beginning in January 2024, calculated per-installation and charged monthly, if the product reaches specific revenue and lifetime installation thresholds. Unity states that monetizing the runtime in this manner is required to "allow creators to keep the ongoing financial gains from player engagement."[102][103]

The new terms faced criticism from game developers who had been using Unity for years, particularly regarding how this fee would be calculated and enforced, and the implications for demos, freemium games and bundles distributed for charitable causes.[104][105][106] The change was considered to be contradictory to statements made by former CEO John Riccitiello in 2015 when Unity originally announced its shift to free and subscription-based models, stating that all users would "get the full power of Unity for free", and that there would not be royalties (in contrast to Unreal Engine, which had recently switched to free distribution but with royalties paid above a specific revenue threshold).[107][98]

Unity then issued a statement clarifying the definition of a chargeable "installation", and announced that the fee would not apply to charity games or bundles.[108][109] Many indie developers, including Among Us developer Innersloth[110] and Slay the Spire developer Mega Crit, announced that they would switch to other engines for future games, specifically the Godot engine for Slay the Spire 2.[111][112]

An analysis by Ars Technica found that several older versions of Unity's terms of service would allow developers to continue to release their software without having to pay the new fee, as long as they did not update their project after the January 1, 2024 date.[107] Ars Technica also discovered that Unity had apparently removed a GitHub repository that permitted developers to track changes in Unity's terms of service;[107] Mega Crit accused Unity of having done so to apply their new financial model to games retroactively.[113][114] An analysis by Game Developer came to the conclusion that the changes were intended to encourage games with large install bases such as Genshin Impact, Subway Surfers and Hearthstone to migrate to Unity services in order to get a fee reduction. The article noted that the Operate Solutions division, handling in-app-purchase services for example, was far more profitable than the Create division, and added that "The many indie developers who will be left by the roadside are completely incidental to Unity's goals, and are not going to be a significant factor in its future decision making."[115] Gameindustry.biz described the move as "self-combustion" and identified the changes as another example of enshittification.[116][117][118]

In response to this negative feedback, Unity Technologies introduced revised runtime fee terms on September 22, 2023. These included removing any fees for uses of Unity Personal for projects funded up to $200,000 (an increase from the previous $100,000 threshold), fees would only apply to games developed with Unity 2024 and beyond without any retroactive fees, and the fee would be based on the lesser of 2.5% of monthly revenue or a calculated value based on monthly engagements, both which rely only on self-reporting of these numbers.[119][120] Unity Technologies faced a 60% decline in stock price over the year to May 2024, partially attributed to the runtime fee policy.[121] Usage of Unity waned after these licensing decisions within the indie game community. The use of Unity at the 2023 Global Game Jam was 61%; this declined to 36% for 2024. A similar decline was recorded by the GMTK Game Jam.[122][123]

CEO Matthew Bromberg announced in September 2024 that the company was discontinuing the runtime fee model of licensing, and instead would annually increase the price of existing plans.[124]

Arbitrary code execution vulnerability discovery

CVE-2025-59489,[125] an arbitrary code execution vulnerability was discovered in June 2025, for games on Android, Windows, MacOS, and Linux, built with all Unity versions from 2017 onward. Due to errors with command line argument processing, applications developed using Unity could be made to load arbitrary libraries and execute code with access to all data from the application at the same privilege level. Unity patched the vulnerability on October 2, 2025 before notifying the public on the next day.[126] It was rated as 8.4 out of 10 on the Common Vulnerability Scoring System, though Unity reported they were unaware of anyone that has used the exploit.[126] Multiple developers rushed out patches for their games affected by the exploit, while Microsoft delisted several of its games from storefronts, including Fallout Shelter and Pentiment, until they were able to supply the necessary patches.[127] A patching tool was also released to allow for users to patch applications manually.[128] The Unity editor was unaffected.

Video games

The engine is used in games including Pokémon Go, Monument Valley, Call of Duty: Mobile, Beat Saber and Cuphead according to the Financial Times in 2020.[129] Some early commercial games in 2007 included Splume (Flashbang Studios), Magical Flying Pink Pony Game (Starscene Software) and Global Conflicts: Palestine (Serious Games Interactive).[130]

As of 2018, Unity had been used to create approximately half of the mobile games on the market and 60 percent of augmented reality and virtual reality content,[131] including approximately 90 percent on emerging augmented reality platforms, such as Microsoft HoloLens, and 90 percent of Samsung Gear VR content.[97] Unity technology is the basis for most virtual reality and augmented reality experiences, and Fortune said Unity "dominates the virtual reality business".[132][133][134]

Machine learning

Unity allows researchers in the field of deep reinforcement learning to train agents inside Unity-created environments.[135] Unity Machine Learning Agents can act as virtual characters or robots to learn creative strategies to interact with simulated real-world environments.[135] The software is used, for example, to develop robots and self-driving cars.[135]

Non-gaming industries

In the 2010s, Unity Technologies used its game engine to transition into other industries using the real-time 3D platform, including film and automotive.[136][137] Unity first experimented in filmmaking with Adam, a short film about a robot escaping from prison. Later, Unity partnered with filmmaker Neill Blomkamp, whose Oats Studios used the engine's tools, including real-time rendering and Cinemachine, to create two computer-generated short films, Adam: The Mirror and Adam: The Prophet.[136] At the 2017 Unite Europe conference in Amsterdam, Unity focused on filmmaking with Unity 2017.1's new Cinemachine tool.[61] In 2018, Disney Television Animation launched three shorts, called Baymax Dreams, that were created using the Unity engine.[138] The Unity engine was also used by Disney to create backgrounds for the 2019 film The Lion King.[139] Automakers use Unity's technology to create full-scale models of new vehicles in virtual reality, build virtual assembly lines, and train workers.[137] Unity is also developing solutions in the fields of architecture, engineering, and construction.

Unity's engine is used by DeepMind, an Alphabet company, to train artificial intelligence.[140] Other uses being pursued by Unity Technologies include architecture, engineering, and construction.[141]