Screenwriting tools

SparkLore vs WriterDuet: What's Different (2026)

WriterDuet — Screenwriting software known since 2013 for real-time co-writing. AI lives outside the editor as per-script paid services.

SparkLore — The AI writing studio that gets your novel, web serial and screenplay finished. The story bible remembers, episodes hit their length, and prose converts to script.

If writing English scripts live with a partner is the point, WriterDuet is a proven choice. If you need AI drafting, a story bible, Korean drama format or novel-to-script conversion, SparkLore fits — but without real-time collaboration (it does export FDX and Fountain).

WriterDuet: Free (3 projects) / Plus $9.99 / Pro $11.99 / Premium $13.99 per month ($89.88–$125.88 per year). ScreenplayProof AI proofreading is $20–30 per script and ScreenplayIQ coverage $24–98 per script, both separate.
SparkLore: from $9.99/mo · 30 free credits (about 3,000 words)
Official site: www.writerduet.comWriters' rooms and co-writing teams working simultaneously

Feature comparison

Yes
Partial
No
Unverified

Feature comparison of SparkLore and 14 competing tools
Feature	SparkLore	WriterDuet
Writing & memory
Story bible	Yes	Partial
Long-series memory	Yes	No
Web-novel episode mode	Yes	No
Script & format
Korean drama script format	Yes	No
US screenplay format	Yes	Yes
Novel-to-script conversion	Yes	No
Export
Fountain / FDX export	YesFountain and FDX export; EPUB too	Yes
DOCX export	Yes	Yes
HWP compatibility	PartialHWP-compatible DOCX layout; no native .hwp yet	No
Korean market
Korean UI	Yes	UnverifiedChinese, Spanish and others; Korean unverified
KRW pricing	Yes	No
Billing
Transparent usage pricing	Yes1 credit ≈ 100 words	PartialNo editor AI; add-ons are flat per script
Bring your own key	No	No
Free plan	Yes	Yes
Platform
Collaboration	No	Yes
Mobile app	NoWorks in mobile browsers; no native app	Yes
Offline	No	Yes
Trust
No training on manuscripts	Yes	Unverified

Pricing comparison

Competitor prices are shown in the currency of their official pricing page; tax and app-store prices may differ. A dash (—) means not applicable or unverified.

WriterDuet — Plans

Plan	Monthly	Annual (per month)
Free 3 projects, read-only sharing	Free	—
Plus $89.88/yr, real-time collab	$9.99/mo	$7.49/mo
Pro $107.88/yr	$11.99/mo	$8.99/mo
Premium $125.88/yr, history, ReadAloud	$13.99/mo	$10.49/mo

SparkLore plans

Plan	Monthly	credits/mo
Monthly subscriptions
Spark For hobby writers · Projects 3	$9.99/mo	300
Author For serial and novel writers · Projects Unlimited	$22/mo	1,200
Studio For prolific authors and teams · Projects Unlimited	$44/mo	3,000
Credit packs (no subscription)
300 Credits valid 90 days, no auto-renewal	$7.99 one-time	300
1,500 Credits valid 90 days, no auto-renewal	$29 one-time	1,500

30 free credits (about 3,000 words) · 1 credit ≈ 100 English words. Subscription credits refill monthly and unused credits do not roll over.

Who it's for

Pick WriterDuet if

Co-writers who need live simultaneous editing
People moving between Fountain, FDX, Celtx and other formats
Anyone who wants a cheap monthly classic screenplay editor

Pick SparkLore if

Writers who want AI drafting and a bible in the editor
Anyone who needs Korean drama format and HWP compatibility
Writers who draft prose first and adapt to script

Honest verdict

WriterDuet

Strengths

The original real-time co-writing — live cursors, comments, text and video chat
Ten import/export formats including PDF, FDX, Fountain, Celtx and DOCX
Desktop app and offline (Plus+), iOS and Android apps, 50% student discount
No watermark on the free plan

Weaknesses

Essentially no in-editor AI drafting; AI is a per-script paid add-on
Its own FAQ is titled 'It's soooo slow!' — long-running speed and sync complaints, iOS app rated 3.1
Two free users cannot co-write; one must be paid
Blog dormant since 2022, Korean UI unverified, no novel mode

SparkLore

Strengths

The story bible is injected into every generation and flags character and setting conflicts across long series
Web-novel episode mode — the editor knows per-platform length targets and where to cut
Novel → Korean drama script (S#) or US screenplay conversion, with Fountain, FDX, DOCX, EPUB and HWP-compatible export
KRW and USD pricing, Korean and English UI, and a published words-per-credit rate
A no-training-on-manuscripts commitment written into the terms

Weaknesses

Launched in 2026 — the community and review footprint are still small
No native mobile app, offline mode or real-time collaboration yet
No bring-your-own-key and no proprietary fine-tuned model
Few plugins and third-party integrations

FAQ

Does WriterDuet have AI?

A 2026 review found no in-editor AI drafting. AI is sold separately: ScreenplayProof proofreading at $20–30 per script and ScreenplayIQ coverage at $24–98 per script.

Can two free users co-write in WriterDuet?

No. The project host must be on Plus or higher for real-time collaboration. Free gives 3 projects (one document each) with read-only sharing.

Why do people say WriterDuet is slow?

Its own knowledge base has a troubleshooting article titled 'It's soooo slow!', and Capterra and App Store reviews report loading delays and missed syncs over several years.

Last verified 2026-09-21

Sources

This page is written by SparkLore. Competitor prices and features are taken from public sources and may change. Tell us if something is wrong.

A question mark means we could not confirm it in official docs — it does not mean the feature is missing.

Compare for yourself

30 free credits (about 3,000 words) on signup. No card required.

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