Bay and Bay Effects, free for the Mac
A video editor and a motion graphics app, laid out the way Premiere and After Effects are. Tell the agent what you want. Fix what doesn’t feel right by hand.
macOS 11 or later, Apple silicon and Intel. Free, no account.
01
Type what you want. The agent sets the title over the sunset and warms the grade, one command at a time, and every step lands in your undo history.
02
The sun pulls the eye away from the title. Open the frame, drag it down to the horizon by hand, and a keyframe appears. Everything the agent made is a layer you can change.
03
Save the fix as a preset, and next time ask for it by name. The agent uses your preset on the next clip, so it edits the way you do.
What the AI does
Speech, masks and tracking run on your own Mac. Narration and music are the only AI features that use the cloud, and only when you ask for them.
Bay, Bay Effects
Every menu item, drag and setting in both apps goes through one list of commands, and an MCP server opens that list to an agent such as Claude. Ask for a rough cut or a lower third and watch it being built in the open project, one step at a time in your undo history.
Bay, Bay Effects
Save an effect stack, a title or an export setting as a preset. An agent can list your presets and apply them by name, so the next edit starts from the way you like it instead of from a default. The presets stay on your Mac.
Bay
Transcribe a clip and its dialogue appears as text. Select words to cut them from the sequence, or remove every um and every long pause in one step. Whisper recognises the speech on your Mac.
Bay
The transcript becomes captions on their own track, timed for reading, with the spoken word highlighted for short-form video. Burn them in or save them as SRT, WebVTT or SCC.
Bay
Click a person or a thing in the Program monitor and Bay draws a mask that follows it from frame to frame. Auto Reframe turns a 16:9 sequence vertical or square and keeps the subject in frame.
Bay
Type a script and a Gemini voice reads it, or describe a music bed and Lyria writes one. This goes through your own Google account, and Bay shows what it will send and asks first.
Bay Effects
Roto Brush can use MobileSAM to separate a subject from the background, and face tracking can use MediaPipe Face Landmarker to follow every eye, brow and mouth point. Both models run on your Mac.
Two apps, one way of working
AI video editing
In development · 0.2.1
An AI video editor for the Mac, laid out the way Premiere is. It transcribes your footage on your own machine, so you cut by deleting words and turn speech into captions, and a click on any object gives you a mask that follows it from frame to frame.
Motion graphics and effects
In development · 0.2.4
AI-assisted motion graphics and effects for the Mac, laid out the way After Effects is. Roto Brush and face tracking can use trained models that run on your machine, and every action is a command an agent can run, so you can ask for a lower third and watch it being built.
If you know Premiere and After Effects
You already know your way around. What changes is that you own the copy on your Mac, and nobody can move the price.
The Source and Program monitors, bins, trim tools and workspaces in Bay sit where Premiere puts them. The shortcut editor has presets for Premiere, Final Cut and Avid, so you keep the keys you spent years learning.
Bay Effects has the Project, Composition, Timeline and Effect Controls panels you expect, and its Graph Editor eases a key the way you would ease it there. Expressions like wiggle and loopOut run as written.
Turn a layer 3D and light it with a key and a fill, seen through a camera you animate like any other layer. Stack effects and layer styles on solids, shapes, text, footage and nested compositions.
Bay and Bay Effects decode and encode video themselves, so there is no FFmpeg to install and no codec pack to hunt for. Queue H.264, HEVC, ProRes with alpha or WebM, or export the animation as Lottie for a web page.
Basic correction, curves, colour wheels and HSL keying are computed in 32-bit float, and the scopes read the graded frame. Every edit is worked out in whole-number ticks, so a cut at 29.97 drop-frame lands on the same frame after a hundred edits as it did after one.
Each app comes with its command-line tool inside. Install it from the app menu, then add it to Claude, and the agent drives the editor you have open.
Project files
Soon, the animations we post will come with the project that made them. Download it, open it in Bay Effects or Bay, and every layer and keyframe is there to take apart and make your own.
Coming soon
Questions
Yes. Both apps are free to download and use, with no subscription, no trial and no account.
macOS 11 or later, on Apple silicon and Intel Macs. Each app is one disk image that runs on both.
Transcription (Whisper), click-to-mask and Auto Reframe (MobileSAM), Roto Brush and face tracking run on your Mac. Generated narration and music are the only AI features that use the cloud: they go through your own Google account, and Bay shows what it will send and asks first.
Choose Install Command Line Tool from the app menu, then add the app to Claude with the command “claude mcp add bay -- bay mcp”. Ask for a rough cut or a lower third, and the agent works in the project you have open, one step at a time in your undo history.
Save what you change as a preset: an effect stack, a title or an export setting. The agent can list your presets and apply them by name, so the next edit starts from your settings. Presets stay on your Mac.
Yes. Bay's shortcut editor has presets for Premiere, Final Cut and Avid, and its panels sit where Premiere puts them. Bay Effects is laid out the way After Effects is.
No. Your footage, projects and anything you type stay on your disk. The apps send crash, performance and usage reports to our own server so we can fix what breaks, and those reports never carry footage, file names, project contents or text you type.
Free, for the Mac
AI video editing
Motion graphics and effects
Both apps are free, run on macOS 11 or later on Apple silicon and Intel, and you don’t need an account. They send crash, performance and usage reports to our own server so we can fix what breaks, and those reports never carry your footage, file names, project contents or anything you type. Questions go to hello@marlstudio.com.