Image and video decision
SlideFast
A competent developer can recreate the core workflow (idea→LLM→editor→export) in ~30 hours; proprietary polish, theme library, and integrations are the main SaaS advantages that you'd lose.
Visit website↗Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need — the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship.
What a replacement has to do
- Paste an idea → generate hook + slide flow + CTA + caption via an LLM → edit slides and brand assets in a web editor → export PDF/PNG and/or post.
What it still won’t have
- Proprietary prompt engineering and curated theme library quality
- Polish of a production slide editor and export pipeline
- Scaling and usage analytics from a mature SaaS
- Built-in integrations (direct posting to LinkedIn, TikTok, Notion, etc.)
What remains hard
- Product polish and ongoing maintenance
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 26 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a minimal SlideFast clone using React (frontend), Node.js + Express (API), Postgres (metadata), and S3-compatible storage for assets. Scope in: 1) API key auth and REST endpoints to create/update/list presentations; 2) LLM integration (OpenAI or compatible) that accepts a short idea and brand assets and returns structured output: hook, slide array, CTA, caption; 3) React editor to edit slide text and select/apply a simple theme; 4) server-side export to multi-page PDF and per-slide PNGs (use Puppeteer or headless Chromium); 5) store presentations and assets; 6) basic UI for import/export and one-click PDF download. Out of scope: multi-channel direct posting integrations, multi-tenant billing, advanced theme editor, collaborative editing. Include error handling for failed LLM calls, failed exports, and missing assets; provide automated tests for API endpoints and an end-to-end smoke test that generates a carousel and exports PDF. Deliver README with setup steps and env var list (DB, S3, LLM API key).
How we checked
How the score was reached
- Build verdict base78
- An open-source build was found+5
- 4 cited sources+3
- Evidence score86
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time — so the same evidence always produces the same number.
How scoring works →Cited sources · 4
Every page the run actually retrieved.
- official productSlideFast - AI LinkedIn Carousel Generator
- official pricingSlideFast Pricing
- official docsSlideFast Documentation
- open sourceAgriciDaniel/linkedin-content-creator (repo)
Integrity checks
What held up, and what did not.
