1. Ahrefs — best for SEO research
Ahrefs is one of the strongest choices if an agency needs to research keywords, competitors, backlinks and content opportunities.
Its major tools include Site Explorer, Keywords Explorer, Content Explorer, Site Audit and Rank Tracker. Ahrefs also supports ranking tracking across locations and competitor comparisons.
For a Singapore SEO agency, I would particularly use Ahrefs for:
- Finding keywords competitors rank for
- Analysing competitor backlinks
- Finding content gaps
- Tracking Singapore keyword positions
- Finding pages generating organic traffic
- Auditing technical SEO issues
Best overall use: competitive research + backlinks + keyword research.
2. Semrush — best all-in-one agency platform
Semrush is probably the closest competitor to Ahrefs and is particularly attractive for agencies managing multiple clients.
Its agency offering includes position tracking, competitor organic research, backlink audits and automated/white-label reporting.
Semrush has also expanded beyond traditional SEO into AI-search visibility, allowing marketers to monitor how brands appear in AI-generated answers as well as conventional search.
Best overall use: agencies that want one large platform covering SEO research, rankings, backlinks, content and reporting.
3. Google Search Console — essential
Google Search Console should be part of virtually every SEO campaign.
Unlike third-party SEO platforms, Search Console gives you first-party information about how Google’s search engine is interacting with your verified website.
Agencies can use it to monitor:
- Search clicks
- Impressions
- Queries
- Average position
- Indexing
- Search-related technical issues
- Individual page performance
It’s especially useful for validating whether the keyword and ranking estimates from third-party tools correspond with actual Google search performance.
4. Screaming Frog — best technical SEO crawler
Screaming Frog SEO Spider is one of the tools I’d consider essential for technical SEO.
It crawls websites similarly to how a search-engine crawler examines pages and helps identify issues such as broken links, redirects, duplicate content, metadata problems and other technical weaknesses.
For a web design or website development agency, this is particularly valuable because technical SEO problems can originate from the underlying website structure rather than the SEO strategy itself.
Best overall use: technical audits.
5. Google Analytics 4 — measure business results
SEO agencies shouldn’t stop at rankings.
Google Analytics helps agencies understand what happens after someone arrives on the website.
For example, an agency can examine whether organic visitors:
- Submit an enquiry
- Purchase a product
- Contact the business
- Visit important service pages
- Return to the website
- Complete another tracked conversion
This is important because ranking #1 for a low-value keyword isn’t necessarily better than ranking #5 for a keyword that produces qualified customers.
6. Google Looker Studio — client reporting
Looker Studio is particularly useful for agencies because SEO data can come from multiple sources.
An agency can create a client dashboard combining information from Search Console, Analytics and other platforms.
Instead of sending clients a spreadsheet full of ranking positions, the agency can present:
Organic traffic → search impressions → rankings → enquiries → conversions
That gives the client a much clearer picture of whether SEO is producing business value.
7. Google PageSpeed Insights — website performance
PageSpeed Insights is useful when SEO overlaps with web design and website development.
It provides performance information for individual pages and reports on relevant user-experience metrics.
For businesses running WordPress or WooCommerce websites, this can help identify performance problems caused by themes, plugins, images, JavaScript or other website components.
8. Google Trends — understand demand
Google Trends is underrated.
An agency can compare search interest between different topics and examine how demand changes over time.
For Singapore businesses, this can be useful when deciding whether to target variations such as:
“web design Singapore” vs “website design Singapore”
or determining whether interest in a product/service is seasonal.
9. Surfer — content optimisation
Surfer is more specialised than Ahrefs or Semrush.
It focuses heavily on content optimisation and can help agencies evaluate whether a piece of content sufficiently covers a topic and aligns with search intent.
I’d treat it as a content-production tool, rather than something an agency needs for every aspect of SEO.
10. BrightLocal — local SEO
BrightLocal is worth considering when an agency manages businesses that depend heavily on local searches.
This is particularly relevant for restaurants, clinics, contractors, professional services and physical stores where Google Business Profile visibility matters.
What I would use for a Singapore SEO agency
If you’re building an SEO operation for PX Design, I wouldn’t buy every tool.
I’d build the stack around:
Core stack
- Google Search Console — actual Google performance
- Google Analytics — traffic and conversions
- Ahrefs OR Semrush — keyword/competitor/backlink research
- Screaming Frog — technical audits
- Looker Studio — client reporting
- PageSpeed Insights — website performance
- Google Trends — search demand
Then add specialised tools only when needed.
Ahrefs vs Semrush: which should you choose?
For a smaller Singapore SEO agency, I’d choose one rather than paying for both initially.
I’d lean toward Ahrefs if your work is heavily focused on:
keyword research + competitor analysis + backlinks + content gaps.
I’d lean toward Semrush if you want a broader agency platform with:
SEO + rank tracking + reporting + competitive research + content + wider marketing functionality.
Both are serious professional platforms. Ahrefs itself publishes an agency-software guide that lists Google Search Console, Google Analytics, Ahrefs, Screaming Frog, Surfer, Google Trends, PageSpeed Insights and Looker Studio among tools used in agency workflows.
