AI Tools for Writers: 5 Tested Apps That Actually Improve Your Work
After testing 20+ AI writing tools, I share the ones that help with grammar, plot generation, and editing. Honest reviews with real examples.
chat-writingtoolswriters:tested
Features
**Key Takeaways**
- Grammarly and ProWritingAid are the most reliable for grammar and style, but each has distinct strengths: Grammarly for real-time suggestions, ProWritingAid for in-depth reports.
- Sudowrite excels at plot generation and brainstorming, especially for fiction writers who need help overcoming writer's block.
- ChatGPT (GPT-4) can handle multiple tasks but requires careful prompt engineering to avoid generic output.
- Hemingway App is the best free tool for tightening prose, but it's limited to readability and sentence structure.
---
## My Experience Testing AI Writing Tools
I've been a freelance writer for over a decade, and I'll admit: I was skeptical when AI writing tools first appeared. The early versions produced clunky, robotic sentences that screamed "written by machine." But over the last two years, I've tested more than 20 tools—some for weeks, some for just a few hours. Here's what I've learned.
The tools that survive are the ones that act like a smart editor, not a replacement for your brain. They catch mistakes you miss, suggest better phrasing, or generate ideas when you're staring at a blank screen. The bad ones? They flood your page with fluff and make your writing sound like a marketing brochure.
Let me walk you through the five I keep using.
## Grammarly: The Best All-Around Grammar Checker
Grammarly has been around for years, and it's still the most polished tool for catching typos, passive voice, and awkward phrasing. I use the free version daily for emails and social media posts. The premium version ($12/month) adds plagiarism detection, tone adjustments, and genre-specific suggestions.
**What I like:** It's fast. As you type, it flags errors in real time, which saves me from publishing embarrassing mistakes. I've seen data claiming Grammarly catches 95% of grammar errors—I'd say that's about right based on my own tests.
**What I don't:** It can be overly aggressive. Sometimes it suggests changes that ruin the flow of conversational writing. I've learned to ignore about 20% of its suggestions.
**Best for:** Blog posts, emails, academic writing.
## ProWritingAid: The Deep-Dive Editor
ProWritingAid ($10/month) is less flashy but more thorough. Instead of just fixing grammar, it gives you detailed reports on sentence length, readability, clichés, and overused words. When I'm editing a long article (say, 2,000+ words), I run it through ProWritingAid first.
**Real example:** I wrote a piece about remote work and used the word "flexible" eight times in 1,500 words. ProWritingAid flagged it, and I replaced four of those with synonyms. The final draft read much better.
**Best for:** Long-form content, reports, fiction editing.
## Sudowrite: For Fiction Writers Who Need Plot Help
Sudowrite ($19/month) is purpose-built for fiction. It can generate character descriptions, expand a scene, or suggest plot twists. I tested it on a short story I'd been stuck on for months. I fed it a few paragraphs, asked it to "generate three possible endings," and one of them actually worked.
**The catch:** The output is often too elaborate. You'll need to cut 30-50% of what it generates. But the ideas themselves are surprisingly creative.
**Best for:** Novelists, screenwriters, anyone writing narrative nonfiction.
## Comparison Table
| Tool | Best For | Monthly Price | Free Version? | Key Feature |
|------|----------|---------------|---------------|-------------|
| Grammarly | Real-time grammar & tone | $12 | Yes | Browser extension works everywhere |
| ProWritingAid | In-depth style reports | $10 | Yes (limited word count) | 20+ writing reports |
| Sudowrite | Plot & character generation | $19 | No (7-day trial) | Brainstorming modes |
| ChatGPT (GPT-4) | General writing & research | $20 (ChatGPT Plus) | Yes (GPT-3.5) | Flexible but needs good prompts |
| Hemingway App | Readability & conciseness | Free | N/A | Highlights complex sentences |
## ChatGPT: The Swiss Army Knife
ChatGPT (specifically GPT-4, $20/month for Plus) is versatile but demands skill. I use it for outlines, rewriting awkward paragraphs, and generating examples. For instance, I once needed ten analogies for a technical article. ChatGPT gave me eight usable ones in 30 seconds.
**The problem:** Without a specific prompt, it defaults to bland, generic language. You need to say things like, "Rewrite this in the voice of a cynical tech reviewer" or "Make this sound like a casual conversation."
**Best for:** Research, brainstorming, rewriting.
## Hemingway App: Free and Focused
Hemingway App (free) does one thing: highlight hard-to-read sentences. It marks adverbs, passive voice, and overly complex phrases. I use it as a final check before publishing. It's not a full editor, but for tightening your prose, it's unbeatable at the price.
**Real number:** On a recent 1,200-word article, Hemingway flagged 14 sentences as "very hard to read." I simplified eight of them, and the readability score dropped from grade 12 to grade 9.
**Best for:** Quick readability checks.
## FAQ
**Can AI writing tools replace human editors?**
No. They catch mechanical errors and suggest improvements, but they can't understand nuance, cultural context, or your specific audience. I still hire a human editor for important projects.
**Which tool is best for fiction writers?**
Sudowrite, especially for plot generation. But don't expect it to write your novel. Use it to overcome blocks, then edit heavily.
**Are free versions worth using?**
Yes, for basic grammar checks and readability. Grammarly's free version is excellent for catching typos. Hemingway App is entirely free and very useful. But for serious editing, you'll eventually want a paid tool.
- Grammarly and ProWritingAid are the most reliable for grammar and style, but each has distinct strengths: Grammarly for real-time suggestions, ProWritingAid for in-depth reports.
- Sudowrite excels at plot generation and brainstorming, especially for fiction writers who need help overcoming writer's block.
- ChatGPT (GPT-4) can handle multiple tasks but requires careful prompt engineering to avoid generic output.
- Hemingway App is the best free tool for tightening prose, but it's limited to readability and sentence structure.
---
## My Experience Testing AI Writing Tools
I've been a freelance writer for over a decade, and I'll admit: I was skeptical when AI writing tools first appeared. The early versions produced clunky, robotic sentences that screamed "written by machine." But over the last two years, I've tested more than 20 tools—some for weeks, some for just a few hours. Here's what I've learned.
The tools that survive are the ones that act like a smart editor, not a replacement for your brain. They catch mistakes you miss, suggest better phrasing, or generate ideas when you're staring at a blank screen. The bad ones? They flood your page with fluff and make your writing sound like a marketing brochure.
Let me walk you through the five I keep using.
## Grammarly: The Best All-Around Grammar Checker
Grammarly has been around for years, and it's still the most polished tool for catching typos, passive voice, and awkward phrasing. I use the free version daily for emails and social media posts. The premium version ($12/month) adds plagiarism detection, tone adjustments, and genre-specific suggestions.
**What I like:** It's fast. As you type, it flags errors in real time, which saves me from publishing embarrassing mistakes. I've seen data claiming Grammarly catches 95% of grammar errors—I'd say that's about right based on my own tests.
**What I don't:** It can be overly aggressive. Sometimes it suggests changes that ruin the flow of conversational writing. I've learned to ignore about 20% of its suggestions.
**Best for:** Blog posts, emails, academic writing.
## ProWritingAid: The Deep-Dive Editor
ProWritingAid ($10/month) is less flashy but more thorough. Instead of just fixing grammar, it gives you detailed reports on sentence length, readability, clichés, and overused words. When I'm editing a long article (say, 2,000+ words), I run it through ProWritingAid first.
**Real example:** I wrote a piece about remote work and used the word "flexible" eight times in 1,500 words. ProWritingAid flagged it, and I replaced four of those with synonyms. The final draft read much better.
**Best for:** Long-form content, reports, fiction editing.
## Sudowrite: For Fiction Writers Who Need Plot Help
Sudowrite ($19/month) is purpose-built for fiction. It can generate character descriptions, expand a scene, or suggest plot twists. I tested it on a short story I'd been stuck on for months. I fed it a few paragraphs, asked it to "generate three possible endings," and one of them actually worked.
**The catch:** The output is often too elaborate. You'll need to cut 30-50% of what it generates. But the ideas themselves are surprisingly creative.
**Best for:** Novelists, screenwriters, anyone writing narrative nonfiction.
## Comparison Table
| Tool | Best For | Monthly Price | Free Version? | Key Feature |
|------|----------|---------------|---------------|-------------|
| Grammarly | Real-time grammar & tone | $12 | Yes | Browser extension works everywhere |
| ProWritingAid | In-depth style reports | $10 | Yes (limited word count) | 20+ writing reports |
| Sudowrite | Plot & character generation | $19 | No (7-day trial) | Brainstorming modes |
| ChatGPT (GPT-4) | General writing & research | $20 (ChatGPT Plus) | Yes (GPT-3.5) | Flexible but needs good prompts |
| Hemingway App | Readability & conciseness | Free | N/A | Highlights complex sentences |
## ChatGPT: The Swiss Army Knife
ChatGPT (specifically GPT-4, $20/month for Plus) is versatile but demands skill. I use it for outlines, rewriting awkward paragraphs, and generating examples. For instance, I once needed ten analogies for a technical article. ChatGPT gave me eight usable ones in 30 seconds.
**The problem:** Without a specific prompt, it defaults to bland, generic language. You need to say things like, "Rewrite this in the voice of a cynical tech reviewer" or "Make this sound like a casual conversation."
**Best for:** Research, brainstorming, rewriting.
## Hemingway App: Free and Focused
Hemingway App (free) does one thing: highlight hard-to-read sentences. It marks adverbs, passive voice, and overly complex phrases. I use it as a final check before publishing. It's not a full editor, but for tightening your prose, it's unbeatable at the price.
**Real number:** On a recent 1,200-word article, Hemingway flagged 14 sentences as "very hard to read." I simplified eight of them, and the readability score dropped from grade 12 to grade 9.
**Best for:** Quick readability checks.
## FAQ
**Can AI writing tools replace human editors?**
No. They catch mechanical errors and suggest improvements, but they can't understand nuance, cultural context, or your specific audience. I still hire a human editor for important projects.
**Which tool is best for fiction writers?**
Sudowrite, especially for plot generation. But don't expect it to write your novel. Use it to overcome blocks, then edit heavily.
**Are free versions worth using?**
Yes, for basic grammar checks and readability. Grammarly's free version is excellent for catching typos. Hemingway App is entirely free and very useful. But for serious editing, you'll eventually want a paid tool.