by Blace Plugins·VFX
Images © Blace Plugins. Used for product review; image policy.
Mask Prompter 3 earns its place for keeping the full rotoscoping workflow local: text, box, and point prompting all run on models that ship with the plugin. Recent updates added Segment Anything 3 and clearer out-of-memory feedback.
Mask Prompter 3 is an AI rotoscoping plugin for After Effects, developed by Blace Plugins and powered by blace.ai. It creates mattes from three kinds of input: text prompts, boxes drawn around objects, or points. All of its models run fully locally on your own machine.
Matte creation is based on Segment Anything 1, 2, and 3 along with custom additions, and matte refinement uses VITMatte. The plugin ships with more than 10 models. This release adds Segment Anything 3, and recent updates introduced a Stop Processing button to cancel long-running computations immediately, plus a CUDA Memory Sharing option that accelerates rendering of resolutions above 4K on CUDA.
Beyond After Effects, Mask Prompter 3 also works with Premiere Pro 2026 and 2025, and the developer documents limitations for Premiere Pro use. A demo video is available. The current version is 3.4.59, updated in June 2026.
Mask Prompter 3 is best for rotoscoping and matte creation in After Effects and Premiere Pro using text, box, or point prompts, with AI models that run fully locally.
Mask Prompter 3 is completely free to download and use.
Mask Prompter 3 lists compatibility with After Effects 2026, 2025, 2024, and 2023, so both 2023 and 2024 are covered. It also works with Premiere Pro 2026 and 2025. Because the models run fully locally, your hardware affects performance, and a CUDA Memory Sharing option can accelerate rendering of resolutions above 4K on CUDA-capable systems. For the latest version and any updated requirements, check the developer's page from Blace Plugins.
Mask Prompter 3 supports Premiere Pro 2026 and 2025 in addition to After Effects 2026 through 2023. Premiere Pro support was added in an earlier update, and the developer notes there are limitations documented at docs.blaceplugins.com/mask-prompter3.html. If you plan to use it inside Premiere Pro, reviewing that documentation first is worthwhile so you know which capabilities apply to your workflow.
Mask Prompter 3 runs all of its models fully locally, so rotoscoping happens on your own machine rather than through a remote service. It ships with more than 10 models, including matte creation based on Segment Anything 1, 2, and 3, and matte refinement based on VITMatte. A CUDA Memory Sharing option can accelerate rendering of resolutions above 4K on CUDA-capable hardware.
Mask Prompter 3 includes a Stop Processing button that cancels long-running computations immediately, which helps when a matte calculation runs longer than expected. Recent updates also improved feedback about out-of-memory situations, so the plugin reports more clearly when a job exceeds available memory, and a fix addressed a crash that sometimes occurred on very long renders. These changes arrived across the versions leading up to the current 3.4.59 release, last updated in June 2026.
Mask Prompter 3 is listed as free in this catalog. Licensing terms can change, so for current details and any conditions it's best to check the developer's page from Blace Plugins. The plugin is powered by blace.ai and ships with the models it needs, all of which run locally on your machine. It handles AI rotoscoping in After Effects and Premiere Pro using text, box, or point prompts.
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