10 Free AI, SEO and Developer Tools I Use Every Week

Developers, marketers, freelancers, and business owners often end up paying for multiple subscriptions just to complete simple tasks.

Over time, I've found that a small collection of focused tools can solve most day-to-day problems without adding more software costs.

Here are 10 free tools I regularly use for AI workflows, SEO tasks, development, and business planning.

---

1. AI Token Counter

When working with OpenAI, Claude, or Gemini APIs, understanding token usage is critical.

I use the AI Token Counter to estimate token usage before sending prompts to AI models.

Useful for:

• Estimating prompt size
• Reducing API costs
• Optimizing requests
• Planning AI budgets

---

2. AI Prompt Cost Estimator

Before launching any AI feature, I like to understand the expected API costs.

The AI Prompt Cost Estimator helps estimate prompt costs, output costs, and monthly usage expenses.

Useful for:

• SaaS planning
• Client proposals
• AI budgeting
• Cost forecasting

---

3. OpenAI Cost Calculator

If you're building with OpenAI APIs, cost estimation should happen before deployment.

The OpenAI Cost Calculator makes it easy to estimate spending based on token volume and model selection.

Useful for:

• GPT projects
• API budgeting
• Cost comparisons

---

4. Claude Cost Calculator

Anthropic's Claude models are becoming increasingly popular.

The Claude Cost Calculator helps estimate API spending and compare Claude costs against other providers.

Useful for:

• Claude projects
• Cost forecasting
• AI provider comparisons

---

5. JSON Formatter

Every developer eventually works with JSON.

I frequently use the JSON Formatter to validate, beautify, and debug API responses.

Useful for:

• API development
• Debugging
• Data validation
• JSON formatting

---

6. Regex Tester

Regular expressions are powerful but debugging them can be frustrating.

The Regex Tester provides a simple environment for testing patterns and validating matches.

Useful for:

• Pattern validation
• Form validation
• Search and replace workflows

---

7. Unit Converter

Sometimes you just need quick conversions without opening multiple websites.

The Unit Converter handles common measurement conversions quickly.

Useful for:

• Development projects
• Engineering calculations
• Everyday conversions

---

8. Freelance Rate Calculator

One of the biggest mistakes freelancers make is underpricing their services.

The Freelance Rate Calculator helps estimate realistic hourly and project rates based on goals and workload.

Useful for:

• Freelancers
• Consultants
• Agencies
• Service businesses

---

9. Compound Interest Calculator

Understanding compound growth is important for long-term financial planning.

The Compound Interest Calculator helps project investment growth over time.

Useful for:

• Investing
• Retirement planning
• Financial forecasting

---

10. SEO Tools Hub

Content creators and marketers often need multiple tools for optimization.

The SEO Tools Hub includes tools for content analysis, AI-assisted writing workflows, humanization, and optimization.

Useful for:

• SEO professionals
• Content creators
• Bloggers
• Marketers

---

Final Thoughts

You don't always need expensive software subscriptions to get work done.

Whether you're building AI products, optimizing content, freelancing, or developing applications, having a reliable toolkit can save both time and money.

What are your favorite free tools for AI, SEO, or development? I'd love to hear what you're using.