Sales Loves Marketing
- Best for
- Bloggers, content writers and small SEO teams who need a quick plagiarism check or a domain authority lookup without a big SEO suite
- Starting price
- $4.17/month, $50 billed annually (All in One Basic)
- Free plan
- ✓ Yes
- Free trial
- ✗ No
Prepostseo is a website with more than 150 free online tools for writing and SEO. Its best-known tool is a plagiarism checker, and it also offers an AI content detector, paraphrasing tools and a domain authority checker. Paid plans raise word limits and remove ads.
Who is Prepostseo for?
Prepostseo suits bloggers, freelance writers, students and small marketing teams who need a quick check before publishing. A content marketer can confirm that a guest post is original, or check the domain authority of a site before pitching it. Teams that need full keyword research, rank tracking and site audits will want a dedicated SEO platform.
What are Prepostseo's main tools?
Plagiarism checker
You paste text or upload a .doc, .docx, .pdf or .txt file, and the checker compares it with web sources. You can exclude specific URLs, for example your own site, and download a report as HTML or PDF. A "Cite it" option helps you add a citation for matched text. The free version takes up to 1,000 words per search. Read more about how these tools work in our guide to online plagiarism checkers.
AI detection and writing tools
Prepostseo lists an AI content detector, a "humanize AI text" tool, a paraphrasing tool, an article rewriter, a summarizer, a grammar checker and a word counter. These are aimed at writers and students more than at marketing teams.
Domain and SEO tools
The domain authority checker shows DA and PA scores; paid plans check up to 500 URLs per submission. Other free tools include a keyword density checker, a meta description generator, a broken links checker, a Google index checker and a website SEO score checker. They are handy for spot checks, not for ongoing SEO work.
Apps and API
Prepostseo lists apps for Android, iOS, Windows and Linux, a WordPress plugin and plagiarism APIs for developers.
How much does Prepostseo cost?
Prices checked on 31 October 2026 on Prepostseo's plans page, for the All in One plans:
| Plan | Billed annually | Billed monthly | Words per submission |
|---|---|---|---|
| Basic | $4.17/month ($50 a year) | $10/month | 5K |
| Standard | $12.50/month ($150 a year) | $20/month | 15K |
| Company | $29.17/month ($350 a year) | $45/month | 25K |
All three include the plagiarism checker, paraphrasing tool, image to text, DA PA checker and AI essay writer, with no ads or captchas. Prepostseo also sells separate plans for the plagiarism checker alone, the DA PA checker and its image tools.
What do users say about Prepostseo?
Prepostseo has only a handful of reviews on G2, rated 4.7 out of 5 at the time of checking, so treat them as a small sample. Reviewers like that the plagiarism checker is fast, highlights copied passages and shows the matching sources. Several value having many tools, such as DA checks, paraphrasing and image to text, in one place.
Criticisms on G2 include slow processing of long documents, word limits and ads in the free version, and paid plans that some reviewers find expensive for what they add.
When should you choose an alternative?
Key features
- Plagiarism checker. Compares text or uploaded .doc, .docx, .pdf and .txt files against web sources, with URL exclusion, citations and HTML or PDF reports.
- AI content detector and humanizer. Estimates whether text was written by AI, and offers a tool that rewrites AI text.
- Paraphrasing and writing tools. Paraphrasing, article rewriting, summarizing, grammar checking and word counting.
- Domain authority checker. Checks domain authority (DA) and page authority (PA) for up to 500 URLs per submission on paid plans.
- Website and SEO checks. Free checks such as keyword density, meta description generation, broken links, Google index status and an SEO score checker.
- Apps, WordPress plugin and API. Apps for Android, iOS, Windows and Linux, a WordPress plugin and plagiarism APIs.
Prepostseo pricing
| Plan | Price | Notes |
|---|---|---|
| Free tools | Free | Most tools work without paying. The plagiarism checker takes up to 1,000 words per search, with ads and captchas. |
| All in One Basic | $4.17/month, $50 billed annually, or $10/month billed monthly | 5K words per submission. Includes the plagiarism checker, paraphrasing tool, image to text, DA PA checker and AI essay writer, without ads or captchas. |
| All in One Standard | $12.50/month, $150 billed annually, or $20/month billed monthly | 15K words per submission and more search queries. |
| All in One Company | $29.17/month, $350 billed annually, or $45/month billed monthly | 25K words per submission and the highest query limits. |
Prepostseo FAQ
Is Prepostseo free?
Most Prepostseo tools are free to use. The free plagiarism checker accepts up to 1,000 words per search and shows ads and captchas. Paid plans raise the limits and remove ads.
How much does Prepostseo cost?
On 31 October 2026 the All in One plans started at $4.17 per month billed annually ($50 a year), or $10 per month billed monthly. Separate plans exist for the plagiarism checker, DA PA checker and image tools.
Is Prepostseo's plagiarism checker accurate?
The few G2 reviews available say it highlights copied passages clearly and shows matching sources. For high-stakes checks, such as academic work, compare results with a second checker.
Who makes Prepostseo?
The site's footer says Prepostseo is a product of Enzipe.