Mask Prompter 3 is an AI rotoscoping plugin for After Effects and Premiere Pro that creates mattes from text prompts, drawn boxes, or points, with all AI models running locally on the user’s machine.
Developed by Blace Plugins.
About Mask Prompter 3
Mask Prompter 3, developed by Blace Plugins, adds AI‑driven rotoscoping to After Effects and Premiere Pro (versions 2023‑2026 for After Effects and 2025‑2026 for Premiere Pro). The plugin generates mattes from three input types—text prompts, boxes around objects, or points—using Segment Anything 1, 2, and 3 models plus custom additions. Matte refinement relies on VITMatte, and the package includes more than ten locally‑run models. New features in version 3.4.59 include a Stop Processing button for immediate cancellation of long calculations and a CUDA Memory Sharing option that speeds up rendering above 4K on CUDA‑capable hardware. A demo video is provided, and documentation notes limitations for Premiere Pro usage.
Features
- Matte creation based on Segment Anything 1, 2, and 3, plus custom additions
- Create mattes by writing text prompts
- Rotoscope using boxes drawn around objects or points
- Matte refinement based on VITMatte
- Ships with more than 10 models, all running fully locally
- Stop Processing button to cancel long-running computations immediately
- CUDA Memory Sharing option to accelerate rendering of resolutions above 4K on CUDA
Best for
Rotoscoping and matte creation in After Effects and Premiere Pro using AI models that run entirely on the local machine, with support for text, box, or point prompts.
Frequently asked questions
Does Mask Prompter 3 work with After Effects 2023 and 2024?
Yes. Compatibility is listed for After Effects 2023, 2024, 2025, and 2026, so the plugin works with both 2023 and 2024 versions.
Does Mask Prompter 3 support Premiere Pro?
Yes. The plugin supports Premiere Pro 2025 and 2026; the developer provides documentation of known limitations for Premiere Pro usage.
Do Mask Prompter 3’s AI models run locally or in the cloud?
All AI models run fully locally on the user’s hardware; no cloud service is used for processing.
How do I cancel a long render in Mask Prompter 3?
The interface includes a Stop Processing button that immediately cancels any long‑running matte calculation.
Is Mask Prompter 3 free?
The catalog lists Mask Prompter 3 as free, though licensing terms may change; users should verify current conditions on the developer’s site.
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