Do these tools actually use AI?

Most writing tools on Stax use curated templates and writing formulas rather than a live LLM — meaning instant results and no data leaving your browser. No API key is required.

Is my text stored when I use these tools?

No. All processing runs client-side in your browser. Your text is never sent to any server or stored by Stax.

Are AI writing tools free?

Yes. All writing tools are free with no usage limits or account required.

Which writing tools are available?

Stax includes a passive voice detector, essay outline builder, bio generator, writing prompt generator, blog title generator, email subject line generator, and caption generator for Instagram, LinkedIn, Twitter, and TikTok.

Can I use generated content commercially?

Yes. All content generated by Stax tools is yours to use freely, including commercially. There are no restrictions on how you use the output.

Free AI Writing

AI writing tools help you craft better content — detect passive voice, generate blog titles, write professional bios, and create social captions in seconds. All tools use curated templates and writing formulas that work offline with no API key required. Your text never leaves your browser.

7 tools available

Most Popular

Passive Voice Detector

Detect passive voice constructions in any text. Highlights passive sentences and shows your passive voice percentage.

Try it free →Essay Outline Builder

Build a structured essay outline with intro, body paragraphs, and conclusion. Add sub-points and export as plain text.

Try it free →Bio Generator

Generate a professional, casual, creative, or Twitter/X bio. Fill in your name, role, and achievements — copy your bio in seconds.

Try it free →

All AI Writing (7)

Passive Voice Detector

Detect passive voice constructions in any text. Highlights passive sentences and shows your passive voice percentage.

Open tool →Essay Outline Builder

Build a structured essay outline with intro, body paragraphs, and conclusion. Add sub-points and export as plain text.

Open tool →Bio Generator

Generate a professional, casual, creative, or Twitter/X bio. Fill in your name, role, and achievements — copy your bio in seconds.

Open tool →Writing Prompt Generator

Get creative writing prompts for fiction, horror, romance, sci-fi, mystery, fantasy, personal essays, and non-fiction. 80+ handcrafted prompts.

Open tool →Blog Title Generator

Generate 30 catchy blog title ideas from any topic — how-to, listicle, question, ultimate guide, and power-title formats. Free, instant, no sign-up.

Open tool →Email Subject Line Generator

Generate 10 email subject lines for any goal — newsletter, sales, announcement, re-engagement, event, or welcome. Character count and spam-word detection included.

Open tool →Caption Generator

Generate social media captions for Instagram, LinkedIn, Twitter, Facebook, and TikTok. Pick tone and platform — get 3 captions with hook, body, CTA, and hashtags.

Open tool →

Frequently Asked Questions

Do these tools actually use AI?: Most writing tools on Stax use curated templates and writing formulas rather than a live LLM — meaning instant results and no data leaving your browser. No API key is required.
Is my text stored when I use these tools?: No. All processing runs client-side in your browser. Your text is never sent to any server or stored by Stax.
Are AI writing tools free?: Yes. All writing tools are free with no usage limits or account required.
Which writing tools are available?: Stax includes a passive voice detector, essay outline builder, bio generator, writing prompt generator, blog title generator, email subject line generator, and caption generator for Instagram, LinkedIn, Twitter, and TikTok.
Can I use generated content commercially?: Yes. All content generated by Stax tools is yours to use freely, including commercially. There are no restrictions on how you use the output.