The honest answer: no single tool is enough. Ben uses 4-5 in combination on every account because each one is good at a different job. If you only ever use one, make it Google Keyword Planner - it's free, the data is from Google itself, and the UK CPC ranges are the closest to reality you'll find anywhere.
The short answer
For UK Google Ads in 2026, the tools Ben relies on are:
- Google Keyword Planner - free, primary source for volume and UK CPC ranges.
- Ahrefs Keywords Explorer - best paid tool for SERP analysis, parent topics and difficulty.
- Semrush Keyword Magic Tool - best for competitor PPC keyword scraping.
- AnswerThePublic - best free source of long-tail question keywords.
- Keyword Tool - best for autocomplete-mining across Google, YouTube and Amazon UK.
What actually matters in a keyword tool
Pretty interfaces don't help. The four things that matter for Google Ads:
- UK-specific CPC accuracy. US-defaulted tools mislead UK budgets badly.
- Match type intelligence. Does it surface phrase/exact variants and the close variants Google now matches?
- Intent signals. Commercial vs informational - PPC only pays back on commercial intent.
- Negative keyword discovery. The tool's job isn't just adding keywords, it's finding the ones to block.
Best free Google Ads keyword tools
1. Google Keyword Planner
Price: Free with an active Google Ads account.
Best for: UK search volume, CPC ranges, forecast tool.
Limit: Volume becomes a bucketed range (e.g. "1k-10k") if you don't have meaningful spend.
Ben's note: this is the only tool sourcing data directly from Google. The UK low/high bid ranges are based on real auction data and are within ~10% of what you'll actually pay - far closer than any third-party estimate. Spending even £500/mo unlocks the precise volume numbers.
2. Google Trends
Price: Free.
Best for: Seasonality, regional UK demand, rising queries.
Use it to spot whether a keyword is trending up or down, and to compare two terms before deciding which to target. Filter by United Kingdom and last 12 months.
3. AnswerThePublic
Price: Free (3 searches/day) or from £5/mo for Individual.
Best for: Long-tail question keywords, content briefs that align with PPC RSAs.
Brilliant for finding the actual phrases UK searchers use - "how much does X cost UK", "is X worth it", "X vs Y". These map cleanly to RSA headlines and landing page H2s.
4. Keyword Tool (free tier)
Price: Free without volume; from $89/mo with data.
Best for: Autocomplete mining across Google UK, YouTube, Amazon UK and Bing.
5. Moz Keyword Explorer (limited free)
Price: 10 free queries/month; from $49/mo.
Best for: Quick "Priority" score that blends volume, difficulty and CTR potential.
Best paid Google Ads keyword tools
6. Ahrefs Keywords Explorer
Price: From $129/mo (Lite).
Best for: SERP analysis, parent topic clustering, "Also rank for", traffic potential.
Ben's most-used paid tool. The "Matching terms" + "Questions" filters surface long-tails Google Keyword Planner buries. UK CPC numbers are estimates and run roughly 15-25% low versus real auction prices - cross-check in Keyword Planner before you build.
7. Semrush Keyword Magic Tool
Price: From $139.95/mo (Pro).
Best for: Competitor PPC keyword spying via the Advertising Research module.
Plug in a competitor's UK domain, see every keyword they're bidding on, the ad copy and estimated spend. Worth Semrush's price tag on its own for accounts entering competitive verticals.
8. SpyFu
Price: From $39/mo.
Best for: Cheaper alternative to Semrush for competitor PPC history.
UK data is thinner than Semrush, but at a third of the price it's a strong starter for SMEs.
9. WordStream Free Keyword Tool
Price: Free with email; full Advisor from $264/mo.
Best for: Quick UK CPC sense-check by industry without logging into Ads.
10. Ubersuggest
Price: Free (3/day) or from $29/mo.
Best for: Budget all-rounder for solo marketers and freelancers.
Tools for SERP and intent analysis
Volume is meaningless without intent. Two tools Ben uses to confirm a keyword is actually commercial:
- Google UK incognito - the cheapest, most accurate intent check. If the SERP is full of ads, shopping carousels and product pages, it's commercial. If it's full of guides and Wikipedia, it's informational.
- Keywords Everywhere - browser extension that overlays volume, CPC and competition directly on Google UK results. From $1.25/mo via credits.
Tools for negative keyword discovery
Negative keyword work is where most accounts leak budget. Tools Ben uses:
- Google Ads Search Terms report (free, native) - your richest source. Filter by "Conversions = 0" and "Cost > £20" to find waste fast.
- Optmyzr - paid PPC management tool with a strong N-gram analyser for negative discovery from $249/mo.
- Adalysis - dedicated PPC auditor with negative recommendations from $149/mo.
Ben's actual keyword research workflow
- Seed list - dump 10-20 obvious terms from the client's site and competitors into a doc.
- Expand in Google Keyword Planner - feed seeds and the client's URL, export everything UK-targeted.
- Cross-reference in Ahrefs - pull SERP data, parent topics and "Questions" for the top 20 seeds.
- Spy on competitors via Semrush Advertising Research - lift any obvious gaps.
- Mine long-tails in AnswerThePublic - feeds RSA headlines and landing page copy.
- Intent-check the top 30 in Google UK incognito - kill anything that's clearly informational.
- Build pre-launch negative list from search-term reports across Ben's other accounts in similar verticals.
Which tools are most accurate on UK CPC
| Tool | UK CPC accuracy | Notes |
|---|---|---|
| Google Keyword Planner | Within ~10% | Source-of-truth bid ranges |
| Ahrefs | 15-25% low | Estimates from clickstream + modelling |
| Semrush | ±20-35% | Variable by vertical |
| Ubersuggest | ±30-40% | Use directional only |
| SpyFu | ±25-35% | UK data thinner than US |
Rule: never quote a budget to a UK client based on third-party CPC alone - always cross-check the final list in Google Keyword Planner.
