Writing and content decision
ProWritingAid
A technical user can build a valuable subset (inline grammar/style suggestions + simple rephrases and a Chrome extension) within a week and modest monthly costs, but recreating ProWritingAid's full suite (plagiarism, advanced manuscript reports, desktop apps, workshops, and polished product integrations) is substantially more work and not realistic for one person.
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
- Accept user text, run grammar/style analyses, return inline suggestions and rephrase options; allow running named reports (readability, overused words, pacing) and produce downloadable/annotated output.
What it still won’t have
- Plagiarism checker and Story Credits advanced manuscript analysis
- Premium Pro features: live workshops, daily cowriting sprints, group critique sessions
- Desktop editor apps and Microsoft Office native integration
- Polished large-suite reports (50+ bespoke writing reports) and long-term brand/market presence
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 2 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 ProWritingAid-like service using Node.js + Express, PostgreSQL, React for the editor UI, and a Chrome extension for Google Docs integration. In scope: (1) API that accepts text/documents and returns detected grammar/style issues and suggested edits; (2) a simple rules-based grammar/style engine plus optional LLM-backed rephrase endpoint (configurable to call OpenAI); (3) React web editor showing inline highlights, a suggestions panel, and 'run report' that lists issues; (4) user auth, subscription check (single paid seat), and document storage in Postgres/S3; (5) Chrome extension that injects highlights into Google Docs and opens the suggestion UI. Out of scope: plagiarism detection, full manuscript 'Story Critique' reports, desktop native apps, and live workshops. Require error handling for API failures, rate limits, and extension messaging; include unit tests for the API, integration tests for editor flows, and CI scripts to run tests and deploy to a single small cloud VM.
How we checked
How the score was reached
- Partly verdict base52
- An open-source build was found+5
- 5 cited sources+3
- Price verified on pricing page+3
- Evidence score63
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 · 5
Every page the run actually retrieved.
- official productProWritingAid — official product
- official pricingProWritingAid Pricing
- official docsProWritingAid for Google Docs
- open sourcelanguagetool-org/languagetool
- open sourcetheJayTea/WritingTools
Integrity checks
What held up, and what did not.
