5 Free SEO Tools Every Indie Hacker Should Use Before Hitting Publish

You just finished writing an article for your SaaS blog. It took you three hours. You're ready to hit publish and move on.

Don't.

The difference between an article that ranks on page 1 and one that disappears into the void often comes down to 5 minutes of pre-publish checks. Checks that most indie hackers skip because they don't have the right tools — or because the tools they know about cost $99/month.

Here are 5 free tools that will dramatically improve your content quality. No sign-up required. No credit card. Just paste your content and get instant, actionable feedback.

1. Headline Analyzer — Score Your Title Before Anyone Sees It

Try the Headline Analyzer →

Your headline is the single most important element of your article. It determines:

• Whether people click in Google search results
• Whether people click in social media feeds
• Whether AI models consider your article relevant to a query
• Whether platforms like Hacker News or Reddit surface your content

A weak headline kills an otherwise excellent article. A strong headline can make mediocre content go viral.

What It Checks

The Headline Analyzer evaluates your title across 9 factors:

Factor	What It Measures
Character length	Is it under 60 characters for Google?
Word count	Is it in the optimal 6–12 word range?
Power words	Does it use compelling words that drive clicks?
Emotional triggers	Does it evoke curiosity, urgency, or value?
Number usage	Does it include a number (which boosts CTR by 36%)?
Question format	Is it phrased as a question (great for featured snippets)?
How-to format	Does it promise actionable value?
SEO keyword position	Is the primary keyword near the beginning?
Capitalization	Is it properly formatted?

Each factor is scored individually, and you get an overall score out of 100 with specific improvement suggestions.

Why It Matters for SEO and GEO

Google's click-through rate (CTR) is a ranking signal. A headline that gets 8% CTR will outrank one that gets 3% CTR, even with the same backlink profile. And AI models use your title tag to determine relevance — a clear, keyword-rich title is more likely to be cited.

Pro Tip

Write 5 variations of your headline and test all of them. The difference between a 55-score headline and an 85-score headline can mean 2x more organic traffic.

2. AI Content Scorer — Check Your GEO Score

Try the AI Content Scorer →

In 2026, ranking on Google isn't enough. You also want your content to be cited by AI models like ChatGPT, Perplexity, Claude, and Gemini. This is GEO — Generative Engine Optimization.

The AI Content Scorer analyzes your article and tells you exactly how well it's optimized for AI citations.

What It Checks

The scorer evaluates 6 GEO categories:

1. Content structure — heading hierarchy (H1 → H2 → H3), paragraph length, overall organization
2. FAQ presence — does your article include a FAQ section? How many questions? Are they well-structured?
3. Lists and tables — AI models prefer to quote structured data. Do you have enough lists and tables?
4. Content type — is it a listicle, how-to, comparison, or guide? Each type has different GEO potential.
5. Word count — is it long enough to be comprehensive? (2,000+ words is the sweet spot)
6. Data and specificity — does it include numbers, statistics, and specific claims?

You get a score out of 100 with a category-by-category breakdown and specific recommendations.

Why It Matters

AI citation traffic is growing exponentially. Sites that optimize for GEO early are building a compounding advantage. Every article you publish without checking its GEO score is a missed opportunity.

Pro Tip

Aim for a GEO score above 70. If you're below that, the most common fixes are: add a FAQ section (instant +15 points), add a data table (+5–10 points), and improve heading structure (+5–10 points).

3. Keyword Density Analyzer — Nail Your Keyword Targeting

Try the Keyword Density Analyzer →

Keyword density is one of the oldest SEO signals — and it still matters in 2026. The problem is that most people either:

• Under-optimize: mention their keyword 2 times in a 2,000-word article (0.1% density — Google barely registers it)
• Over-optimize: stuff their keyword 50 times in 2,000 words (2.5% density — Google flags it as spam)

The sweet spot is 1–2% density for your primary keyword, with natural usage of related terms throughout the article.

What It Checks

Paste your article content and target keyword, and the analyzer shows:

• Exact keyword frequency — how many times your keyword appears
• Keyword density percentage — frequency relative to total word count
• Density rating — whether you're under-optimized, optimal, or over-optimized
• Total word count — to verify you're hitting the 2,000+ word target
• Top words and phrases — the most frequent terms in your article, so you can spot unintentional keyword stuffing

Why It Matters for SEO and GEO

Google uses keyword density as one of many relevance signals. Too low and Google doesn't associate your page with the keyword. Too high and Google classifies it as spam. For GEO, consistent keyword usage helps AI models understand what topic your article authoritatively covers.

Pro Tip

Check density for your primary keyword AND your top 2–3 secondary keywords. Your primary should be 1–2%, secondaries should be 0.5–1%. This natural keyword distribution signals topical authority to both Google and AI models.

4. SERP Preview — See Your Google Listing Before Publishing

Try the SERP Preview Tool →

You can have the best content in the world, but if your Google listing looks bad, nobody clicks on it. Your title tag and meta description are essentially ad copy in search results — they need to sell the click.

The SERP Preview tool shows you exactly how your page will appear in Google search results on both desktop and mobile.

What It Shows

• Title tag preview — with character count and truncation warning if over 60 characters
• URL/slug preview — how your URL appears in search results
• Meta description preview — with character count and truncation warning if over 160 characters
• Desktop view — full-width Google desktop result
• Mobile view — compressed Google mobile result (where 60%+ of searches happen)

Why It Matters

A truncated title tag loses critical information. A meta description that cuts off mid-sentence looks unprofessional. A URL with random IDs instead of keywords looks untrustworthy.

These tiny details have a massive impact on CTR. And since CTR is a Google ranking signal, a better-looking SERP listing literally helps you rank higher.

Pro Tip

Your meta description should include:

1. The primary benefit or promise (what will the reader learn?)
2. A specific detail (a number, a timeframe, a result)
3. A soft CTA ("Learn how," "Discover why," "See the exact steps")

Keep it under 155 characters to avoid truncation on mobile.

5. Readability Checker — Ensure Anyone Can Understand Your Content

Try the Readability Checker →

You're a technical founder writing about a technical product. Your natural writing style is probably too complex for optimal SEO and GEO performance.

This isn't about dumbing down your content. It's about clarity. The clearest explanation of a complex topic will always outrank and out-cite a convoluted one.

What It Checks

• Flesch-Kincaid Reading Ease — a score from 0–100 (higher = easier to read). Aim for 60–80.
• Flesch-Kincaid Grade Level — the US school grade needed to understand your text. Aim for 6th–8th grade.
• Average sentence length — long sentences hurt readability. Aim for under 20 words average.
• Average word length — shorter words improve readability
• Reading time — estimated time to read the full article
• Paragraph count — more paragraphs = more white space = better readability

Why It Matters for SEO and GEO

Google's algorithms factor in user engagement signals like bounce rate and time on page. Hard-to-read content increases bounce rate, which hurts rankings.

For GEO, readability is even more critical. AI models extract and quote content verbatim. If your sentences are clear and concise, they're quotable. If they're long and convoluted, AI models skip them in favor of clearer sources.

Pro Tip

If your Flesch score is below 60:

• Break long sentences into two shorter ones
• Replace jargon with simpler words (use "start" instead of "initiate")
• Use bullet points instead of long paragraphs
• Add transition words between sections

The 5-Minute Pre-Publish Checklist

Here's the exact workflow to run before every article:

Step	Tool	Time	Target
1	Headline Analyzer	1 min	Score above 70
2	AI Content Scorer	1 min	GEO score above 70
3	Keyword Density	1 min	Primary keyword 1–2%
4	SERP Preview	1 min	No truncation on mobile
5	Readability Checker	1 min	Flesch score above 60

Total time: 5 minutes. That's it. Five minutes that can mean the difference between page 1 and page 10.

Beyond Manual Checks: Automating the Pipeline

These 5 tools are designed for manual, one-article-at-a-time checks. They're perfect for:

• Validating content before publishing
• Auditing your existing articles
• Learning what "good" SEO content looks like
• Quick quality checks on freelance or AI-generated content

But if you're publishing 10+ articles per month, manual checks become a bottleneck. That's where a fully automated pipeline comes in — one that handles keyword research, article generation, optimization, and multi-platform publishing without you touching any of these tools.

OctoBoost automates all of these checks (and more) as part of its SEO article pipeline. Every generated article is automatically optimized for keyword density, readability, heading structure, FAQ sections, and SERP appearance.

Frequently Asked Questions

Are these tools really free? What's the catch?

They're genuinely free, with no sign-up required. They run entirely in your browser. We built them as standalone tools because we believe every indie hacker should have access to basic SEO analysis — regardless of budget. They also demonstrate the kind of optimization that OctoBoost automates at scale.

How often should I use these tools?

Every single time you publish an article. It takes 5 minutes and the impact on your rankings is significant. Also use them to audit your existing content — you'll often find quick wins by improving headlines or adding FAQ sections to older articles.

What's a good GEO score?

Above 70 is solid. Above 85 is excellent. Below 50 means your content is unlikely to be cited by AI models. The most common issues are missing FAQ sections, poor heading structure, and insufficient content length.

Do these tools work for non-English content?

The Headline Analyzer and Keyword Density Analyzer work with any language. The Readability Checker uses Flesch-Kincaid which is calibrated for English — results for other languages are approximate. The SERP Preview and AI Content Scorer work regardless of language.

Can I use these tools on competitor content?

Absolutely. Paste a competitor's article into the Keyword Density Analyzer or Readability Checker to see how their content compares to yours. This is a great way to identify gaps and opportunities.

What if my content scores low on multiple tools?

Prioritize fixes in this order: (1) Headline — it affects CTR the most, (2) Content structure / GEO score — add FAQ and fix headings, (3) Keyword density — adjust to 1–2%, (4) Readability — simplify sentences, (5) SERP preview — polish meta tags. Each improvement compounds.