DiagnoSEO review: all-in-one SEO audits, keyword research, backlink checks, AI writing and a WordPress plugin. Plans start at $9/month with a 7-day trial.
Researched and fact-checked by Bartu Cavusoglu · Updated October 26, 2026
DiagnoSEO is a cloud-based SEO and content marketing platform that brings site auditing, keyword research, backlink analysis, competitor research, rank tracking and AI content writing into one account. Its tools are grouped into on-page and technical SEO, keyword research, content, off-page SEO and analytics, and the pricing page lists 60+ tools on the Pro plan.
The company says it has developed the software since 2016 and was founded by an SEO veteran with more than a decade of experience at Fortune 500 brands. Its stated mission is to make SEO simple and affordable. Beyond the web tools, it sells a WordPress SEO plugin and a Gutenberg-first theme and builder.
The tools run in a browser on desktop or mobile, so nothing needs to be installed. You choose a tool, enter a URL, keyword or domain, and get a report. For audits, the company suggests testing a sample of page types, such as a homepage, category page and product page for a shop, plus a single article for a blog.
Each run costs credits. A basic SEO audit costs 1 credit, an advanced audit 3, a SERP Analyzer run 2 and a backlink check 1. Credits work across all tools with no daily or monthly limits, and subscribers on eligible plans can buy more.
The SEO audit checks more than 200 on-page ranking factors, and the crawler adds brand compliance checkpoints. The SERP Analyzer applies AI and Pearson correlation to competitor pages. Keyword tools include live Google autocomplete ideas with search volume, bulk volume checks for up to 1,000 keywords, related keywords, questions, People Also Ask, a topical map generator and a TF IDF tool.
On the content side, the Content Editor offers semantic recommendations, UX checkpoints and AI internal link suggestions. Writing tools include an AI article generator using GPT-4o mini or GPT-4o, a rewriter, translator, headline and outline generators and Humanize AI. The backlink checker adds reports on anchor text, broken links, linking TLDs and locations.
DiagnoSEO is a cloud-based SEO and content marketing platform. It includes site audits, keyword research, backlink analysis, SERP and competitor analysis, rank tracking and AI content tools. It also offers a WordPress SEO plugin.
Plans are Basic at $9, Advanced at $19, Pro at $39 and Enterprise at $129 per user per month. Annual billing is $90, $190, $390 and $1290, a 16% saving. The WordPress SEO plugin is $49 per user billed annually.
Yes, the site advertises a 7-day free trial, and the Advanced plan lists a trial for $7. A free version of the DiagnoSEO WordPress plugin is also mentioned. The company also cites a 100% Satisfaction Guarantee.
The FAQ names SEO copywriters, freelancers, SEO specialists, digital marketing agencies, e-commerce managers, content managers and marketing managers. The Pro plan is aimed at SEO and WordPress agencies and freelancers.
No. The tools run in a browser on desktop or mobile. Only the WordPress plugin requires downloading a zip file and uploading it to your WordPress site.
Each tool run costs a set number of credits, for example 1 credit for a basic SEO audit or 3 for an advanced audit. Credits work across all tools with no daily or monthly limits, and the site offers extra credits for purchase to active subscribers.
Yes. You can cancel through your Paddle or PayPal account, or contact support for help. Accepted payment methods are PayPal, Visa, MasterCard and American Express.
The sources name WordPress, through the DiagnoSEO Pro plugin and the theme and website builder. Enterprise includes API access, but no other integrations are listed.