Lastslate

Lastslate is a screenplay editor for Mac and Windows, best suited to writers who want script planning, review, and AI assistance alongside drafting. Its free tier covers core solo work; paid plans make the most sense when you need more cloud capacity, history, or live co-writing.

Overview

Lastslate recognizes screenplay elements such as scene headings, character cues, and dialogue as you type, and saves automatically. Its Beat Board links story beats to script scenes, while built-in tools derive cast lists, location and prop breakdowns, loglines, and one-sheets from a script. That combination keeps planning and practical production documents close to the draft, rather than requiring separate tools.

It supports Final Draft FDX, Fountain, plain text, and PDF, including reconstruction of editable scenes from PDF screenplays. This is useful when bringing older or shared scripts into an editable workflow. Lastslate is specifically a screenplay editor, however, and its AI is not a dialogue generator or rewriting tool.

Key features

AI collaboration and privacy

The AI collaborator reads scripts and responds to them, but does not write dialogue. For writers who want assistance without delegating authorship, that is a meaningful boundary; writers seeking generated dialogue or scene rewrites should look elsewhere. Paid users can connect their own Claude, OpenAI, or Gemini account, or a model running on their computer, with the key kept in the computer's keychain.

When an AI action is invoked, the relevant script excerpt, prompt, and session conversation context go to the AI provider for that request. Scripts are stored locally by default; optional cloud backup is encrypted in transit and at rest. The company says scripts, prompts, and completions are not used to train AI models. Writers should still consider the per-request sharing before sending sensitive material to an AI provider.

Planning, review, and co-writing

The Beat Board is included on every plan and connects beats to scenes; Pro adds reference images to beats. Review links let recipients comment on specific script lines in a browser without an account, with threaded replies attached to a particular draft. Pro also supports live co-writing with up to 10 writers in one script, a stronger fit for collaborative rooms than for writers working alone.

Companion Mode watches a script file created in another editor and rereads it after saves, but works read-only. Asking it questions requires Pro or a user-provided model key, so it can extend an existing workflow without replacing the other editor, but it cannot edit that file.

Pricing

Lastslate has a free plan and paid plans billed month-to-month, plus annual terms for select options. The free plan costs nothing and includes the full editor, PDF and FDX export, Beat Board, 10 cloud projects, 30-day version history, and a limited AI collaborator. It is a capable starting point for solo writers, with cloud-project and history caps as the main constraints.

Pro costs $15 a month, billed month-to-month, and includes $15 AI usage each billing cycle, unlimited cloud projects and version history, and co-writing for up to 10 writers. Pro+ costs $45 a month on the same billing cadence and provides three times Pro's included AI, alongside the same stated project, history, and writer limits. Pro+ is for heavier AI use; the listed plan terms do not describe additional collaboration capacity.

Student Pro costs $10 a month, or $100 USD per year, with a school email, and is available to students in the US and Canada. It includes the Pro plan, making it the lower-cost route for eligible students. Individual (Pro) costs $15 a month or $150 a year and includes a 7-day free trial, extended AI collaborator limits, advanced models, AI scaffolding, review links, unlimited cloud projects and version history, real-time co-writing, and usage-based pricing. The annual Individual (Pro) option is $150 a year with those same stated features. The 14-day trial described for the product differs from the 7-day trial attached to Individual (Pro); check the applicable offer before starting.

Platforms

Lastslate runs on macOS 12 or later, on Apple Silicon and Intel, and its Mac app is notarized by Apple. The Windows app supports 64-bit Windows 10 and 11, uses a code-signed installer, and updates automatically.

Who it's for

Lastslate is a strong fit for screenwriters who want automatic formatting, linked story planning, and script-derived production tools in one desktop app. It is especially appealing to writers who value local-first storage, browser-based line comments, or a path to live co-writing. It is less suited to people who need AI-generated dialogue, rewriting, or a fully web-based editor.

Pros and cons

• Pros: Broad script import and export support, including editable-scene reconstruction from PDF, helps bring scripts from different workflows into one editor.
• Pros: The Beat Board is available on every plan, and review links allow account-free commenting tied to a draft.
• Pros: Local storage by default and optional encrypted cloud backup give writers a clear choice about cloud use.
• Cons: The AI does not write dialogue or rewrite scenes, excluding a common use for generative writing tools.
• Cons: Free users face a 10-project cloud cap, 30-day version history, and limited AI collaborator.
• Cons: Companion Mode is read-only, and questions require Pro or a user-provided model key.

Alternatives

Choose ScreenWeaver if you want a screenplay option with a forever-free plan offering unlimited projects and pages, plus PDF and Final Draft export. Screenplay Assistant may suit writers who want a free plan centered on AI formatting, character images, storyboards, and Atticus answers.

FiveDraft is worth considering for mobile-first drafting across Android, iOS, and web; its free plan allows unlimited local drafts but saves only one script to cloud and watermarks PDF exports. For an iOS or Mac editor with offline use, unlimited scripts, and no account requirement on its free plan, consider Inkwell.

ScriptDraft is an Android and iOS option with a free Fountain editor, PDF, Fountain, and FDX export, and support for more than 100 languages. Scriptuber is another alternative. For a web-based script tool, consider FluvAI, which offers a free tier of three scripts per month and one source per script. ngram is another alternative.

For broader discovery, browse AI Script Writing Software and Writing Apps.

Verdict

Choose Lastslate if you want a desktop screenplay editor that combines beat-to-scene planning, script review, and collaboration with local-first storage. Its strongest reason to choose it is how much of the writing workflow sits beside the draft, including review links and live co-writing on paid plans. Look elsewhere if your priority is AI-generated dialogue or rewriting, or if you need a web-based editor.