Mask Prompter 3

Segment Anything 3 added! All models runs fully locally.

Rotoscope with AI based on text inputs, boxes around objects or points! ✂️

Powered by blace.ai

Learn about license types
  • EULA
Description

Mask Prompter 3 for After Effects and Premiere Pro


Features

Segment Anything 3

Use the power of Segment Anything 3 to create mattes easily.

Text based matting

Use natural language to describe the objects you want to key. Matting has never been that easy and flexible. Split prompts with dot to key multiple objects at once.

High-Quality Mattes

The refinement module creates high-detailed mattes easily.

Interactive

We applied some custom extensions to the underlying AI - therefore you'll get interactive prompting

Image

Stable on video

It's very easy to get consistent results on video. The rivers matte was created with a single point placed on the river!

Image

Multiple output modes

Output your mattes as overlays for visualization, as a black-white matte or as content with transparent alpha channel. This allows for versatile integration in your workflow and combination with other effects.

Detect custom objects

Draw rectangles around unlimited number of custom objects. (Example enhanced with DeepGlow.)


Tutorials


System Requirements

Windows with NVIDIA GPU >= 8GB Other Windows Apple Silicon with MacOS Sequoia or newer and >= 16GB RAM Other MacOS
very slow

Documentation


Upgrade Notice

If you purchased any previous Mask Prompter version after Apr 11, 2025, you can upgrade for free. Otherwise, the upgrade is $35. Simply login to the same account and the upgrade discount will be added in the cart.


Follow us on socials

Discussions

Want to talk about it?

Head over to r/aescripts to chat with fellow users about this product.

Need Support?

Please open a support ticket to be connected directly with the author of this product

Version History

3.4.49 -

Feb 16, 2026

Fix initialization bug which occured on some systems.

3.4.47 -

Feb 11, 2026

- Premiere Pro compatibility. Please check documentation for limitations: https://docs.blaceplugins.com/mask-prompter3.html
- small bug fix regarding parameter handling

3.4.46 -

Jan 28, 2026

- update shared libraries

3.4.45 -

Jan 26, 2026

- switch to new AI backend
- accelerate rendering of big resolutions (>4k) on CUDA (option: CUDA Memory Sharing)

3.4.42 -

Nov 26, 2025

Add Segment Anything 3 based box / concept prompting and detection threshold slider. Increase matte accuracy.

3.33.42 -

Nov 24, 2025

Add Segment Anything 3 based text prompting.

3.3.42 -

Nov 11, 2025

Updated licensing framework. Fix installer sometimes not pulling all needed libraries. Please update all of our other plugins as well.

3.2.41 -

Nov 4, 2025

Improve stability in composition with multiple effect instances. Please update all of our other plugins as well.

3.2.40 -

Oct 17, 2025

Fix black frame bug.

3.2.39 -

Oct 16, 2025

Fix empty path error if text prompt was set as box input.

3.1.36 -

Aug 12, 2025

Fix initializing bug on some systems with AMD cards.

3.1.35 -

Aug 4, 2025

Fix initializing bug with RTX 5xxx cards.

3.1.33 -

Jul 31, 2025

Improve error logging.

3.1.31 -

Jul 16, 2025

Compatibility update.

3.1.30 -

Jul 15, 2025

Fix for memory leak that could appear under some settings.

3.1.29 -

Jul 7, 2025

Compatibility update.

3.1.28 -

Jul 1, 2025

Fix 16bit mode causing artifacts in bright areas.

3.1.27 -

Jun 17, 2025

Add three new SOTA object detection models. Add rectangle scale slider.

3.0.27 -

Jun 16, 2025

Fix for memory leak that could appear under some settings.

3.0.26 -

Jun 12, 2025

Improved performance and lower memory consumption across all models.

3.0.3 -

Jun 11, 2025

- New features: multi object mattes from text, rectangle drawing and 4 updated models.

- bug fixes

Compatibility

After Effects

2026, 2025, 2024, 2023

Premiere Pro

2026, 2025