Prepostseo bundles a web-based plagiarism checker, AI paraphraser, AI content detector, OCR and bulk DA PA checker with 150+ smaller writing and webmaster tools. Most tools have a capped free tier; paid plans raise per-submission word limits and monthly query quotas.
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Prepostseo is a browser-based collection of more than 150 free online tools for writing, plagiarism checking and SEO, with paid plans that lift word limits and query quotas. The site is aimed at webmasters, students, teachers and SEO specialists, and its best-known pieces are a plagiarism checker, an AI paraphrasing tool, an AI content detector, an image-to-text converter and a bulk DA PA checker.
The site credits its ownership to Enzipe: the About page says Prepostseo was developed and owned by Enzipe Software House, and the footer describes it as a product of Enzipe. The iOS app, however, is sold under a different company name, CLIXADE LTD.
Two things shape almost every decision about Prepostseo. It is a toolbox rather than one product: 61 tools sit under Writing & Education, 17 under Domain Tools, 32 under Website Management and 59 under More Tools, and free limits differ from tool to tool. And it publishes no accuracy figures for plagiarism or AI detection, so its scores come without any stated error rate.
The All in One plan bundles six tools: the plagiarism checker, paraphraser, humanizer, AI essay writer, image-to-text converter and DA PA checker.
The stated search scope is the public web. The checker page does not describe a repository of previously submitted papers, so it answers "is this text already online?" rather than "has someone handed this in before?".
The detector page links straight to the humanizer, and the humanizer page claims its output passes detectors such as GPTZero and Copyleaks. That is the vendor's own claim; no independent test of it was found in this round.
A separate API lets schools and publishers run the plagiarism checker inside their own platform. The API page lists "No Storage to our database" as a feature, and API plans are sold in 30-day query bundles.
The plagiarism checker is the workflow Prepostseo documents step by step.
A paid subscription is cancelled from the Billing section of your account: open the subscription, click the three dots next to it and select Cancel Subscription.
Prepostseo suits people who need several light utilities occasionally and would rather pay one small subscription than several specialist ones. The plagiarism checker page itself names students, teachers, researchers, and content writers and bloggers as the people it is built for.
It fits less well when:
The plagiarism checker page also advertises a Mac desktop application; no Mac download link was found in the pages checked in this round.
Prepostseo sells an All in One subscription plus single-tool plans. Paid plans remove ads and captchas and raise the per-submission word limits.
The pricing page opens on annual billing; the monthly prices appear after switching the toggle.
| All in One plan | Billed monthly | Billed annually | Words per submission | Search queries (monthly / annual plan) | Humanizer 2.0 queries (monthly / annual plan) |
|---|---|---|---|---|---|
| Basic | $10 / month | $50 per year ($4.17 / month) | 5K | 5K / 50K | 30K / 150K |
| Standard | $20 / month | $150 per year ($12.50 / month) | 15K | 25k / 200K | 60K / 450K |
| Company | $45 / month | $350 per year ($29.17 / month) | 25K | 75K / 500K | 135K / 1.05M |
All three All in One tiers include the plagiarism checker, paraphrasing tool, image to text converter, DA PA checker, AI essay writer and Deep Search.
| Single-tool plan | Billed monthly | Billed annually | Main allowance |
|---|---|---|---|
| Plagiarism Checker Basic | $7.5 / month | $81 per year | 5K words per submission monthly, 10K on annual |
| Plagiarism Checker Standard | $9.5 / month | $100 per year | 10K words per submission monthly, 20K on annual |
| Plagiarism Checker Business | $18 / month | $183.6 per year | 25K words per submission |
| Paraphrasing | $7 / month | $63 per year | 2.5K words per submission; 10K submissions monthly, 125K annual |
| DA PA Checker | $10 / month | $60 per year | 500 URLs per submission; 7,000 URLs monthly, 100,000 annual |
| Image to Text | $7 / month | $54 per year | 50 images per submission; 10K credits monthly, 120K annual; 30 MB files |
An Image Translator plan is sold separately in monthly tiers of $9, $14.9 and $45, covering 700, 1.7K and 7K images at 10 MB per file. The plagiarism checker API is priced per 30 days: $10 for 5,000 queries, $29 for 25,000 and $199 for 250,000, with custom quotes above that.
Several plan cards carry "Save Big" badges with a struck-through price, for example 11% on Plagiarism Checker Basic and 50% on annual Paraphrasing. The page does not say whether these are time-limited offers.
Plagiarism quotas are counted in search queries, and a query is one sentence. The pricing page estimates that a 300-word article uses almost 12–18 queries, while the general FAQ says a 1,000-word plagiarism scan uses approximately 20–30 credits. The two pages use different units, and neither page reconciles them with the other. When a plan's credits or word limit run out, the account drops back to free-tier features until the quota resets or you upgrade.
Free use is limited by rate as well as size: free users can process up to 10 requests per minute across Prepostseo tools. The humanizer's free version processes up to 700 words per request.
Alternatives make sense when one of Prepostseo's boundaries matters for your task.
The limits below come from Prepostseo's own terms, policies and product pages.
This is the most important point for anyone checking unpublished or confidential writing, because Prepostseo's own pages give conflicting rules.
The About page still describes 20+ tools and says visitors get 30 search queries while free users get 500 per month, which does not match the 150+ tools on the homepage or the per-minute limit in the current FAQ.
Most tools work without an account, but each has a free cap. A signed-out plagiarism check allows 1,000 words and the humanizer 700 words per request. Separately, the paraphraser's input counter shows 1000 words.
The privacy policy says no; the terms of use say uploaded text is stored on cloud servers for plagiarism checking. The two statements conflict.
No accuracy figure is published, and the terms disclaim any guarantee of accuracy or reliability.
Only in narrow cases such as duplicate charges or an unused current plan. Renewals, partially used plans, API plans and plans bought at a sale discount are non-refundable.
