Best AI Screenwriting Tools in 2026: Laper, Arc Studio, WriterDuet, Saga, Final Draft and SparkLore Compared

We make SparkLore, which is included below. We have tried to describe competitors' strengths as their own users would, and where a competitor is a better fit for a particular writer we say so.

The tools at a glance

Sources: each vendor's pricing and documentation pages, retrieved September 2026; see the individual sections for specifics.

Laper

Laper is the newest serious entrant, founded in September 2025 by a former screenwriter, and the most aggressively AI-native. The script is the source of truth: outline, beats, characters and locations are derived from it, and the AI assistant can read the script at six scopes from cursor to full document. It has a real-time collaboration layer built on a CRDT, version history with named snapshots, an "AI Script Doctor" that diagnoses structure and dialogue without scoring, and a pre-production side that generates character portraits, storyboard frames and 15-second video clips.

Strengths: the workflow is coherent in a way bolted-on AI is not; formatting is automatic in both Hollywood and an "Asian convention" layout; the UI is localised into 11 languages including Korean, Japanese and Chinese; and it has published verifiable revenue (Stripe-verified figures on TrustMRR show roughly $44,000 monthly recurring revenue and around 1,350 paying subscribers in September 2026), which suggests writers are willing to pay for this workflow.

Limitations, from its own documentation: Fountain export "is not currently available"; FDX export covers Hollywood format only; the full-script AI mode is bounded to 800 nodes and reports truncation beyond that, which matters for long features and series; credit purchases are "final and non-refundable"; the underlying AI models are not disclosed; there is no mobile app; the public changelog stopped at v0.4.1 in January 2026. Its pricing runs from a free "Junior" tier through $20, $60, $100 and $400 per month, with annual billing at 80% of monthly.

Who it suits: a writer who wants one tool from idea to storyboard and is comfortable with a young product. Our full Laper review goes deeper.

Arc Studio Pro

Arc Studio positions itself as "where screenplays get finished": a clean, modern editor with strong outlining (a plot board of drag-and-drop beat cards), season outlines and bibles, branch-and-merge revision management, real-time collaboration and desktop plus iOS apps. Named users include writers on Arcane, Shrek and Suits; it has published testimonials from David Wain and Christian Linke.

Its AI is deliberately limited. The help centre describes Research, AI Proofreader, AI Comments and AI Tone Adjustments, operating on selected text only, powered by GPT-4 or in some cases GPT-3.5, plus a Table Read feature with synthetic voices. These are not included in the subscription; they run on a pay-as-you-go credit system because, in Arc's words, the features are provided by outside parties that charge per use. Credit pack prices are not published on the pricing page, which is the most consistent complaint on Trustpilot ("you have to buy additional credits, which they don't tell you about").

Pricing is annual only: free (2 scripts, watermarked PDF), $69/year Essentials, $99/year Pro, with a 7-day Pro trial and a 14-day refund. Fountain and FDX export are available on all tiers including free. The iOS app is rated 3.4 stars and has drawn repeated bug complaints; the service had a roughly 22-hour outage in December 2025 caused by a database key overflow, which the founder documented in a public post-mortem.

Who it suits: writers who want the best outlining and collaboration in the category and do not want AI drafting at all.

WriterDuet

WriterDuet has been the real-time co-writing tool since 2013 and claims over two million users. Its core is collaboration: live cursors, comments, text and video chat, and a ReadThrough mode with assigned voices. It imports and exports ten formats each way (PDF, FDX, Fountain, Celtx, DOCX, RTF, HTML, JSON, CSV and its own), which makes it the most flexible tool in this list for moving scripts between systems. The Pro tier adds custom formats, statistics and gender analysis, revision tracking, page locking and production tools.

There is no AI inside the editor. WriterDuet sells two AI services separately: ScreenplayProof (AI proofreading, listed at $20 per script, $30 with reformatting) and ScreenplayIQ (AI coverage with scene visuals, priced by tier from roughly $24 for a TV script to $98 for a full feature evaluation). One Stage 32 user's verdict on ScreenplayIQ was that it produced "pretty but useless by rote info".

Pricing is the lowest of the paid editors: free (3 projects, no watermark), Plus $9.99, Pro $11.99, Premium $13.99 per month, with yearly at $89.88 to $125.88 and a lifetime Pro licence sold through StackSocial at $199.99. Two free users cannot co-write; one must hold a paid plan. Known weaknesses: the company's own troubleshooting page is headed "It's soooo slow!", the iOS app is rated 3.1 stars with sync complaints, and the blog has not been updated since 2022.

Who it suits: writing partners, writers' rooms on a budget, and anyone who needs to export to everything.

Saga

Saga (writeonsaga.com, rebranding to CreateSagas) was built in 2021 on the first GPT-3 API and calls its screenplay editor "Final Draft on AI steroids". It offers inline AI rewrite, a coverage chatbot, a customisable 40-beat feature structure, character arcs, a TV series matrix for episodic arcs, and exports to TXT, FDX, Fountain and PDF. It is the only tool in this list besides SparkLore that exports both Fountain and FDX with AI drafting inside.

The company has pivoted toward AI filmmaking: the homepage now leads with "Transform Ideas into Videos", and the Premium plan's 40 monthly credits are described as roughly 40 images or 4 videos, with text generation unlimited. Premium is $19.99 per month with a 3-day trial; the FAQ notes a planned increase to $29.99 and the new site shows $30. Refunds are not offered. Traffic is small (Similarweb reported around 11,500 visits in August 2026 with an average visit under ten seconds), the blog is dormant, and there are no substantive public reviews either way.

Who it suits: a writer who wants to go from script to storyboards and short video in one tool and is comfortable with a product whose centre of gravity has moved away from writing.

Final Draft 13

Final Draft is not an AI tool, and it is on this list because most comparisons pretend it is. Its official homepage, pricing page and FD13 feature list describe Beat Board, Outline Editor, Structure Lines, Navigator and Typewriter view, none of which involve AI. Several third-party blogs describe "Final Draft Assist" or "Beat Board AI"; we could not find any official source and treat those as unverified.

What Final Draft has is the file format. FDX is what production offices, scheduling software and most working writers use, and Final Draft's claim that it is used by the large majority of film and television professionals is the reason every other tool on this list imports and exports FDX. FD13 costs $199.99 one-time (list $249.99), $79.99 as an upgrade, $99.99 for students; a Final Draft Suite subscription with cloud is from $8.33 per month billed yearly or $16.99 monthly.

Who it suits: anyone delivering to production. It is common to write in something else and finish in Final Draft.

SparkLore

SparkLore is our product, so read this section with that in mind. It is a writing studio built around the idea that novels, web novels and scripts are often the same story in different containers. A project holds a manuscript and a script side by side with one shared story bible (characters, places, plot threads), and the AI can draft, rewrite and convert prose into formatted scenes with that bible as context. The script editor supports the American format and the Korean broadcast format (S# numbering, jimun, (E)/(N) tags), exports Fountain and DOCX with a Korean-layout option, and we do not train models on your manuscripts.

What we do not have as of launch: FDX export, storyboard or video generation, real-time multi-cursor collaboration, and a mobile app. If those matter to you, Laper or Saga (visuals), Arc Studio or WriterDuet (collaboration) are better choices today. Pricing is credit-based with monthly plans and pay-as-you-go packs; the numbers are on the pricing page and explained in our pricing guide.

Tools we looked at and left out

• Celtx: a production-pipeline tool (script, breakdown, schedule, budget) with no AI on its pricing or home page; about $14.99 to $24.99 per month for writer tiers as of September 2026.
• ScreenWeaver: open beta from a French studio; a free screenwriter plan with PDF and FDX export and a $9.99 storyboard beta. Interesting, too early to rank.
• Greenlight Coverage, Inkshift: AI coverage services, not editors. Greenlight starts at $75 per month; Inkshift critiques from $25.
• Write with LAIKA: discontinued; the domain now redirects to an unrelated product.
• Sudowrite, Squibler: novel tools with screenplay features. Sudowrite has blog guides but no dedicated screenplay mode we could find; Squibler generates screenplays with formatting but we found no Fountain or FDX export.

How to choose

Ask three questions.

Do you want AI to draft, or only to check? If draft: Laper, Saga, SparkLore. If check or none: Arc Studio, WriterDuet, Final Draft.

What must you export? If FDX for production, all except SparkLore at launch. If Fountain for portability, all except Laper. If a Korean broadcast layout, SparkLore or Laper's Asian convention export.

How do you want to pay? Monthly from about $10 (WriterDuet), annual only (Arc Studio), one-time (Final Draft), per-use credits (Arc's AI, Laper, Saga's visuals), or a subscription with a visible credit meter (SparkLore). Our pricing explainer goes through what each model actually costs a working writer.

Whatever you choose, keep a Fountain or FDX export of every draft. Tools change; plain files do not. See Fountain vs FDX vs PDF.

Try it in SparkLore

If your story lives in both prose and script, or in both English and Korean formats, SparkLore is built for that case. The free AI script generator drafts a formatted scene from a premise without an account, and the drama script formatter converts plain text into either layout. Head-to-head pages against each tool above are on our alternatives page, and projects begin when you sign up.