Comparison

Seobility SEO Check vs HTML Viewer Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Seobility SEO Check

This app analyzes your website's SEO compliance, providing detailed checks on meta information, page quality, headings, links, and server configuration. It offers actionable tips for optimizing your site for better search engine rankings and sustainable SEO success.

Highlights
  • Meta-information analysis
  • Page quality checks
  • Heading structure analysis
  • Inbound and outbound link evaluation
  • External factor assessment
  • Server configuration review
Features
Read full description

Compliance with search engine guidelines is very important for success in search engine rankings. The SEO Check analyzes all relevant criteria and gives tips for optimizing the website for a sustainable SEO success. Overview of checks and analysis: Meta-information: • Analysis of the page title for length (in pixels), content and technically correct markup • Analysis of meta description length (in pixels) and correct specification in HTML • Analysis of tobots.txt if Google and Bing are allowed • Check for Noindex information • Check if Canonical link is correct • Check for hreflang links • Check whether server location, domain and language match the recognized language • Checking the domain for length and technical problems • Analysis of the page URL by parameters, including sessions etc. • Check for the correct favicon in the HTML • Check for charset encoding and check for inconsistencies • Check if Doctype markup is correct Page quality: • Analysis of usage and frequency of highlighted text (b and strong tags) • Analysis of repetitions and too long texts • Search for problematic frames and framesets • Textual page text analysis and content reuse of headings and titles • Recognition of social sharing options • Check for good image alternative text (alt attribute) • Search for inline CSS information • Analysis if there is too much ads on the page • Check for spelling mistakes • Identify the well optimized keywords Page headings: • Check for the correct length and use of the H1 tag • Check for correct heading usage, quantity and search for text repetitions Inbound Links: • Analysis of external links on the page • Check the internal links for quantity, duplicate text and link text length External factors: • Check for occurrence on the Shalla List, Adult/Safe for work classification and Google Safebrowsing • Check if the page is well linked from external sources • Search for backlinks from Wikipedia • Analysis of the dissemination of a link in social networks Server configuration: • Search for useless HTTP headers • Check if there is a redirect for www. and non www. URLs • Check the loading time • Check for size of the HTML • Check for amount of CSS and Javascript files

About

HTML Viewer Pro

View HTML source code from URLs or directly from Safari. This app offers multi-tab browsing, bookmarking, and search functionality. Customize the display with various themes, fonts, and user agents.

Highlights
  • View source code from URLs
  • View source code from Safari share
  • Multi-tab browsing
  • Bookmark and history management
  • Keyword search in source code
  • Switch between static and dynamic HTML
  • Customizable themes and fonts
Features
Read full description

It is a multi-functional HTML source viewer. You can view the source code by URLs, and of course, you can also view the source code from Safari's share button. Since it is the latest version of the app, it covers almost all the features of other apps. [Features & Functions] - Browser and source code switching. - Multi-tab browsing. - Display bookmarks and history. - Search for keywords in the source code. - Switch between static and dynamic HTML. - Changing the user agent. - Display non-HTML languages. - Use the cloud, such as iCloud, Dropbox, OneDrive, etc. - Use local files in the iPhone and iPad. - Balanced light operation. [View source code] - About 90 different design themes available. - Change the font, size and line spacing. - Switch between static and dynamic HTML. - Support for almost all programming languages (over 180). [Terms & Conditions] https://www.hayaya.net/terms-conditions/html-viewer.html [Privacy Policy] https://www.hayaya.net/privacy-policy/html-viewer.html

Screenshots

Seobility SEO Check4 screens
HTML Viewer Pro4 screens

Verdict

The call

The clearest difference is review sentiment: Seobility SEO Check at 94% against HTML Viewer Pro's 49%. Seobility SEO Check also leads on rating (4.9 vs 3.9) and in-app purchases (none vs 2). On price and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. HTML Viewer Pro sells 2 in-app purchases, starting at $1.99 per month. Seobility SEO Check asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Seobility SEO Check holds the better App Store score, 4.9 against 3.9. That said, the two scores are not equally well evidenced: Seobility SEO Check has 337 ratings behind it against 45, so its average is the more settled of the two. Written reviews point the same way: 94% of Seobility SEO Check's written reviews are positive against 49% of HTML Viewer Pro's.

UpkeepUpdate frequency

Seobility SEO Check ships an update every 3 months, HTML Viewer Pro every 15 months. The most recent releases landed on October 15, 2026 and October 10, 2026 respectively.

Scorecard8 real differences · 2 level
Seobility SEO Check versus HTML Viewer Pro: the parameters behind the verdict, then further details
ParameterSeobility SEO CheckHTML Viewer Pro
PriceFreeFree
Rating4.9 (337 ratings) — better3.9 (45 ratings)
Positive reviews93.8% of reviews — better49.1% of reviews
Number of ratings337 — better45
Update frequencyEvery 3 months — betterEvery 15 months
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS9.0 — better12.0
Further details — not scored
Size56 MB33 MB
Age rating4+17+
DeveloperSeobility GmbHHayato Shimizu

Customer experience

Seobility SEO Check

All ratings324 ratings
Positive97.5%
Neutral1.9%
Negative0.6%
Written reviews16 reviews
Positive93.8%
Neutral0.0%
Negative6.3%

HTML Viewer Pro

All ratings45 ratings
Positive68.9%
Neutral8.9%
Negative22.2%
Written reviews53 reviews
Positive49.1%
Neutral13.2%
Negative37.7%

Bugs and requests

Seobility SEO Check

Requested features

3 requests
  • Show image names for images without alt tags
  • Display multiple anchor texts
  • Add more details

HTML Viewer Pro

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Seobility SEO Check

No in-app purchases

2 purchases

HTML Viewer Pro

Subscriptions1
  • Premium (Monthly plan)$1.991 Month
One-time1
  • Premium (Buying out)$19.99

Questions

Is Seobility SEO Check free?
Seobility SEO Check is free to download, with no in-app purchases.
Is HTML Viewer Pro free?
HTML Viewer Pro is free to download, with in-app purchases available.
Which has better reviews, Seobility SEO Check or HTML Viewer Pro?
Seobility SEO Check is rated higher. Seobility SEO Check averages 4.9 out of 5 from 337 ratings, while HTML Viewer Pro averages 3.9 from 45 ratings.
Do Seobility SEO Check or HTML Viewer Pro have ads?
HTML Viewer Pro shows ads; Seobility SEO Check does not.
Which is updated more often, Seobility SEO Check or HTML Viewer Pro?
Seobility SEO Check ships an update every 3 months, and HTML Viewer Pro every 15 months. Most recently, Seobility SEO Check was updated on October 15, 2026 and HTML Viewer Pro on October 10, 2026.

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