Online SEO Tools – the Ultimate Collection - Tổng hôp tool SEO online

All tools listed below fall under the following criteria:

1. they are all useful for SEOs;
2. they are all web-based (no desk-top ones or FireFox extensions so far);
3. they are all free.

If you know of any online SEO tools that were not mentioned here, please comment and I will update the post. I will do my best to continuously update the article to delete the tools that are no more available and add new ones.

Table of Contents:

• Backlink Analyzing Online SEO Tools;
• Keyword Research and Brainstorming Tools:
  • Keyword Brainstorming Tools;
  • Social Media Based Keyword Analyzers;
  • Online Dictionaries and Glossaries that Help with Keyword Research
• Domain Name Online Tools;
• On-Site Analysis Online SEO Tools:
  • On-page Keyword Prominence Research Tools;
  • SEO Browsers;
  • Page Size and Load Time Checkers;
  • Additional Site Diagnostics Tools;
• Search Related Online Tools:
  • Keyword Rank Checking Tools;
  • Tools that Compare Different Search Engine Results;
• Website Traffic and Demographics Report.

1. Backlink Analyzing Online SEO Tools

Options/Tools	Smart   backlinks	Analyze   Back Links       (currently not working)	Link   Diagnosis	Link Hounds Yahoo Backlink Info
Checks links to	Page	Page	Domain	Domain, page, all deep links
Best feature	Fast and smooth	Keyword-in-anchor-text search	Multiple sorting and filtering options	Data organization based on the linking domain
Anchor Text	+	+	+	-
PR	+	-	+	-
Linking page outbound links	-	Inaccurate	+	-
Nofollow highlight	+	-	+	-
Firefox Extension	+	-	+	-
Sorting options	-	-	+	-
Interface	user-friendly	simple	user-friendly	user-friendly
Set Preferences	+	+	-	-
Useful links	-	-	-	whois data; site web archive; Google cache; linking pages.

More backlink checkers:

• Backlink Watch (checks Anchor text);
• Domain Backlinks Checker (sorts the results based on the first- and second-level domains);

2. Keyword Research and Brainstorming Tools

Keyword Brainstorming Tools

Tools that help expand your keyword lists with synonyms, related terms and keyword phrases.

Tools/Features	What you will find there
Google Sets	Related terms (i.e. terms that are likely to appear in lists).
MSN clustering tool	Word clusters (keyword phrases).
Searchradar	Tag clouds and keyword definitions.
Keyword Map	Related terms (synonyms and keyword phrases).
Urban Dictionary	Related terms (related synonyms and urban words).

Social Media Based Keyword Analyzers

Use social media sites to explore how people use and tag your core term, its popularity and related words.

Features/Tools	TweetVolume	Twitter Search	Del.icio.us related terms	Facebook Lexicon
Data source	Twitter	Twitter	Del.icio.us	Facebook
How to use it.	Compare up to 3 terms popularity.	See your term in live context.	See your term related tags.	See how often your term is mentioned across FB walls.

Online Dictionaries and Glossaries that Help with Keyword Research

Dictionary	What you can find there:
The free dictionary	Your keyword definition(s), set phrases/ idioms (use them to lighten up your writing style), examples of usage,   words of the same root (inflected words and derivations), thesaurus, classic literature mentions, keyword phrases, related acronyms.
Wordnet	Definitions and sample sentences using your key term.
Rhyme Zone	Rhymes (can be real fun to play with by the way), synonyms, antonyms.
Synonym.com	Keyword synonyms and antonyms.
Cambridge online dictionary	Essential definitions and keyword phrases.
Meta Glossary	The word definitions, related words and synonyms.
Reference.com	Your core term synonyms and definitions.
Merriam-Webster dictionary	Definitions and derived terms.

3. Domain Name Online Tools

Dynamic Tools for Domain Name Brainstorming:

Features/Tools	PsychicWhois	Domize	BustAName
TLDs	6 ( .com, .net, .org, .biz, .info, .us)	3 (.com, .net, .org)	3 (.com, .net and .org)
Brainstorming help	domain name suggestions based on your previous searches and related terms	shows domain names one-character shorter than the one specified	Mixes the given keywords, suggests synonyms, adds prefixes and suffixes, shows both singular and plural versions, drops last vowel, checks for both hyphen- and non-hyphen versions

Additional domain name checkers and generators:

• DomainsBot (dynamically checks the availability of domain names for 6 TLDs: .com, .org, .net, .info, .biz, .us);
• InstantDomainSearch (dynamically and really fast checks the availability of domain names for 3 TLDs: .com, .org, .net);
• DomainNameSoup (suggests alternative terms for your core term, has a handy typo generator, adds words before and after your term);
• Suggest Name and (DotoMator) – has a fairly large database of available prefixes and suffixes that are sorted out in categories;
• NameBoy (generates the list of domain names based on your primary and secondary (optional) terms).

4. On-Site Analysis Online SEO Tools

On-page Keyword Prominence Research Tools.

Online SEO tools that help analyze keyword on-page usage.

Element to analyze:	Ranks	SEOworkers	RankQuest
Title tag	+	+	+
Meta Description	+	+	+
Headings	+	-	+
Alt tags	+	+	+
Anchor texts	+	+	+
Bold text	+	-	+
Text	1-, 2-, 3-word phrases	1-, 2-, 3-word phrases	1-, 2-, 3-word phrases

SEO Browsers

Features/ Tools	Domaintools SEO browser	SEO Browser
General benefits	find prominent elements (keywords) of the page; check page elements visibility and accessibility.
Additional features	optimization score and tips on improving it	page meta tags, domain IP address, header response, page size, total number of links, words and images,

One more great tool to see text-only version of the site: LynxView

Page Size and Load Time Checkers

Features/Tools	Web Page Speed Report	Page Size Extractor
Total page size	+	+
Images	total size of the images	total number and size of the images
JavaScript size	+	-
CSS size	+	-
Each page object size	+	-
Download time	+	-
Additional features	list of useful recommendations on reducing size of particular elements	total number of hyperlinks, full list of all links on the page

Additional Site Diagnostics Tools:

• Bad Neighborhood Tool (scans external links on a page and detects ‘bad links’).
• Search engine SPAM detector (detects a few types of black-hat tricks: hidden text, doorway pages, keyword stuffing, etc).
• (Recently improved) Trifecta Page/ Site/ Power tool (allows only one search per day for non-pro SEOmoz members) – offers an exhaustive report on your site/ page power and ways to improve it.

5. Search Related Online Tools

Keyword Rank Checking Tools

Online tools that check any term(s) rankings across various search engines.

Most valuable rank checkers:

Features/Tools	SeoMoz Rank Checker	Search Engine Forums Tool	Shoemoney Serps Script	SEObook Rank Checker
best feature	Archives the results	Checks multiple terms	Fast and easy to use	Advanced search options (+ international data centers)
export the results	Yes	No	No	No
several terms at a time	No	Yes	No	No
# of results checked	100	10	~100	1000
overall # of SEs	4	1	4	1
# of SEs at a time	1	1	4	1
link to the actual results page	Yes	No	No	No
registration required	Yes	No	No	No
term of use	Paid (with daily free 5 searches)	Free	Free	Free
browser plugin	Yes (Browser Button)	No	No	No
main drawbacks	Would be great if the history/reports could   be split into projects (i.e. domains checked) and SEs	Checks only top 10 results	No way to export/save results	No export feature.

Note: the tools may be checking different data centers, so the results can be slightly different from tool to tool.

More rank checking tools:

• Search Engine Keyword Tracker & Keyword Ranking Tool;
• Ventio Google Position;
• SEOChat Keyword Position Check;
• Searchenginegenie Rank Checker;
• Mike’s Ranking Reports.
• KeywordEnvy (checks up to 5 terms at a time and represents data in a handy graph.

Tools that Compare Different Search Engine Results

Features/Tools	Prase	Thumbshots	Fuzz Find
# of SEs	3 (Google, Yahoo, MSN)	2 (Google and Yahoo)	3 (Google, Yahoo, Live) (+Del.icio.us)
Additional Features	Sort by Google PR; start from any result;   set the min. PR to filter low-PR sites	Graphic representation of ranking differences.   Highlight the site you want to track	Sort the results based on   any Search Engine or Del.icio.us

More search related tools:

• Pagerank Search allows to sort Google search results by Google PageRank or by relevance.

6. Website Traffic and Demographics Report

Features/Tools	Alexa.com	Compete.com	Google Trends	Quantcast
Traffic unit of measurement	percent (compared to overall Internet users measured by Alexa)	number of people	(average)	number of unique people/ number of visits
Time range	3 months	per month	(average)	per month / per week
Compare traffic	up to 5 domains	up to 5 websites	up to 5 websites	No
Demographics report	No	No	No	(U.S. only)   visitors’ gender distribution; age; household income; ethnicity; education.
Additional features	Shows traffic distribution across different countries; related websites; sites linking back to the one being checked	(U.S. only)   Reviews time spent on site compared to overall time spent in the Internet by US people (average change in this metric); average time spent on site by one person; number of pages per one visit.