Codex by OpenAI
AI that writes code for you
WriteMyPRD
Make Writing PRDs a Breeze with GPT-3
Updated February 2026
| Codex by OpenAI | WriteMyPRD | |
|---|---|---|
| Rating | 5.0★ | 4.8★ |
| Reviews | 20 | 5 |
| Pros | 0 | 4 |
| FactScore™ | 66.1 | 37.4 |
FactScore™ Comparison
FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.
Pros & Cons
Only in Codex by OpenAI — Pros
No unique pros listedBoth tools — Pros
—Only in WriteMyPRD — Pros
Time saving Easy to use Good starting point Helps with writer's blockOnly in Codex by OpenAI — Cons
—Both tools — Cons
—Only in WriteMyPRD — Cons
GPT-3 limitation Quality of PRDs Limited support Login issues Slow performanceDetails
| Codex by OpenAI | WriteMyPRD | |
|---|---|---|
| Categories | AI Coding Agents | AI Coding Agents, Writing assistants, Product add-ons |
| Platforms | Web | Web |
| Became Popular | August 10, 2021 | January 9, 2023 |
| Website | openai.com | writemyprd.com |
Who Should Pick Which?
Choose Codex by OpenAI if...
- No unique pros listed
Choose WriteMyPRD if...
- Time saving
- Easy to use
- Good starting point
With a FactScore™ of 66.1 vs 37.4, Codex by OpenAI leads in community reception. Codex by OpenAI uniquely offers No unique pros listed, while WriteMyPRD stands out for Time saving and Easy to use.
What Users Say
Codex by OpenAI
Even with new models around, Codex remains one of the most reliable AI coding assistants—fast, structured, and still very useful.
Still the fastest way to get a working regex or a complex utility function from a single-line comment.
OpenAI Codex has become an essential part of our development workflow. With our AGENTS.md providing project context, Codex understands our monorepo architecture and coding conventions, autonomously...
WriteMyPRD
Does the job perfectly and helps with writers block when getting started with PRDs.
it is very easy to use and I was able to create a PRD in seconds. 😍❤️
Its a easy to use and very helpful tool for PM. Loved it🚀
Related Comparisons
Frequently Asked Questions
Which is better, Codex by OpenAI or WriteMyPRD?
Based on FactScore™, Codex by OpenAI leads with a score of 66.1 vs 37.4. Codex by OpenAI has a higher rating of 5.0★ compared to 4.8★.
What are the pros of Codex by OpenAI compared to WriteMyPRD?
Codex by OpenAI uniquely offers: No unique pros listed.
What are the pros of WriteMyPRD compared to Codex by OpenAI?
WriteMyPRD uniquely offers: Time saving, Easy to use, Good starting point, Helps with writer's block.
Is Codex by OpenAI better rated than WriteMyPRD?
Codex by OpenAI is rated 5.0★ from 20 reviews. WriteMyPRD is rated 4.8★ from 5 reviews.
What is the FactScore™ of Codex by OpenAI and WriteMyPRD?
FactScore™ weighs rating and review volume together. Codex by OpenAI scores 66.1 and WriteMyPRD scores 37.4.
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