Writing is a ton of work. It takes an average of three hours and sixteen minutes to write 1000 words. It’s no wonder that many marketers and content managers are wondering if an AI writing tool can live up to its promises.
In this post, we’re putting some of the main content-generating tools to the test. Can they improve your content creation process and content workflow?
Table of contents:
- TL;DR: Impressions after comparing 3 AI writing tools
- Putting StoryChief to the test
- Putting Jasper.ai to the test
- Putting Copy.ai to the test
TL;DR: Comparing 3 AI Writing Tools in 2025
- StoryChief
- Offers AI writing and full-scale content collaboration, SEO auditing, and multi-channel publishing.
- Ideal for professional bloggers, marketers, and agencies—excels in both content quality and workflow efficiency
- Jasper AI
- Best for large-scale long‑form content creation, SEO optimization, and team collaboration.
- Produces stronger drafts compared to Copy.ai and supports advanced templates and integrations
- Copy.ai
- Great for quick, inexpensive short-form copy—social posts, ad text, titles.
- Cheaper, but weaker at outlines and full blog posts; not recommended for long-form writing
Tool #1: Putting StoryChief AI writing tool to the test
StoryChief is a content operations platform for content marketing teams and agencies. At StoryChief, we’re not just focused on (AI) writing. We help make content teams’ lives easier through content collaboration features, one-click publishing, and omnichannel promotion.
Video: Create a content strategy and write a blog post with StoryChief AI in under 1 minute
Benefits of using StoryChief AI:
- Brand‑voice detection – Automatically learn and apply your tone and style
- Full‑length drafting – Generate blog posts, press releases, social content, job descriptions, outlines, briefs
- Content calendar generation – Auto‑create strategic calendars and 20+ AI‑powered prompts
- Content‑gap & SEO auditing – Spot weak pages or keyword chances and get AI‑guided fixes
- Weekly audits & refreshes – William checks content performance and suggests updates
- Multichannel publishing – One‑click publish or schedule to CMS, socials, newsletters
- 24/7 AI assistance – Always‑available chat to brainstorm, research, rephrase, optimize
- Campaign creation & research – William helps plan campaigns, analyze competitors, gather trending ideas
- Everyday marketing tasks – Cover image creation, SEO briefs, translations, tone adjustments on demand
But the question remains...can writing AI really produce quality content?
Let’s find out.
Here are the different things we tested with StoryChief’s AI writing tool:
- Strategic content calendar
- Social media campaign from any blog URL.
- SEO & gap analysis
- Weekly content audits
- Detect and apply brand voice
- Full blog writing
Test #1. Auto-build a strategic content calendar
What we tested:
We used William to generate a one-month content calendar based on our brand, target audience, and SEO strategy. We asked it to create snackable, short social posts.
Findings:
William produced a calendar with 20+ article and social post ideas, complete with themes, keywords, target personas, and optimal publishing dates.
I love how creative these posts are. They make the content more emotional and interesting by poking at the readers’ desire to stay relevant and up-to-date.
Success:
We love how easy it was to come up with these content ideas tailored to our company description, target audience, and content pillars. This research would normally take around 3 hours. Drag-and-drop is available in the content calendar which makes it easy to move content pieces around.
Failure:
Editing dates requires manual adjustments. You’ll still need to add images or visuals, but this can also be done with StoryChief AI - it just requires some extra effort.
Our overall opinion on the result of the test:
AI can easily come up with more (and often better) ideas faster than a human writer can, so this is an excellent use case for AI.
I love how easy this tool is to develop content ideas tailored to your target audience! With this tool, you don’t have to wonder whether a piece of content will perform - all of the content ideas are generated from real-time data that will help you outperform competitors.
Test #2. Craft a social media campaign from any blog URL
What we tested:
We input a blog post URL, and William generated a full social media campaign.
Findings:
The campaign included platform-specific posts (LinkedIn, X, Facebook), captions, hashtags, and scheduling across the content calendar.
Success:
The campaign was ready in under 5 minutes, ensuring consistency and engagement across platforms.
It’s easy to transform your blog posts into captivating social media content and let StoryChief automatically generate engaging social posts as part of any content campaign or from any URL.
Failure:
Hashtag suggestions occasionally missed niche tags; manual refinement may be needed.
Test #3. SEO & content gap analysis
What we tested:
We used William to analyze existing blog articles for SEO performance and content gaps.
Findings:
William identified underperforming posts, suggested new topic angles, and recommended missing keywords and structural improvements.
These are the keywords suggested around ‘SEO content calendar integration’.
Success:
The analysis was data-driven and aligned with live search console metrics, aiding in content optimization.
Failure:
Some emerging long-tail keywords were overlooked; human oversight is still beneficial.
Test #4. Weekly content audits
What we tested:
We activated automated weekly audits to identify stale content and low-performing pages.
Findings:
William flagged 10 posts with declining traffic, suggested updates like adding visuals or refreshed CTAs, and prioritized them for revision.
Success:
Quickly refreshed evergreen content, improving SEO health and engagement metrics.
Failure:
Prioritization logic sometimes ranked less critical content higher; user prioritization is still beneficial.
Test #5. Brand-voice detection & application
What we tested:
We trained William by feeding three sample blog posts via URL.
Findings:
William generated content with consistent terminology, tone, and style across drafts, aligning with our brand personality.
Success:
Brand-specific phrases and tone levels were captured automatically.
With StoryChief's AI Power Mode, you can confidently use AI to create content without sacrificing your brand's identity or tone of voice.
Failure:
Tone calibration took two passes to hit the right balance on formality vs conversational style.
Test #6. Full blog writing
What we tested:
For our next test, let’s write some blog content. It’s time to start drafting those paragraphs.
We used AI Power Mode to generate an editorial brief and outline, then used Expand to draft a 1,500-word article.
Findings:
- Brief included audience, tone, intro hook, and key points.
- Outline covered 7 subheads with SEO suggestions.
- Expanded sections read fluidly, were plagiarism-free, and aligned with brand voice.
And when we run the entire AI output through Grammarly’s plagiarism detection, we get a score of 100%, meaning no plagiarism is detected. Our AI scans millions of data sets to come up with unique, fresh content every time, so you never have to worry about another StoryChief user getting the same output as you. And you never have to worry about plagiarism.
Success: The result was a near-complete article that needed only minor human polish.
This test is definitely a success. The fact that it provides so much text means that you can easily choose what information you want to cover.
Failure: AI occasionally overused transition phrases—editing needed for style refinement.
Overall verdict of StoryChief AI
By combining William’s strategy-building, audit routines, and tactical execution with StoryChief’s AI writing features, users can go from plan to publish—all in one platform.
Join 5,000 marketing professionals and teams who already save multiple hours every week on creating and distributing content. Get started today. 🙌
StoryChief gives you all of these AI features inside our content collaboration platform so you can plan, assign, approve, publish, and promote your content!
Tool #2: Putting Jasper.ai to the test
Next, we used a writing assistant named Jasper.
Here are the different things we tested with Jasper’s AI writing tool:
- Blog post topic ideas
- Blog post introduction paragraph
- Blog post outline
- Blog content improvements
- Social media promotional copy
Test #1. Blog post topic ideas
First, we’re checking out how Jasper can help with blog post headlines.
Here’s an example of writing AI output:
12 Ways to Improve Your Content Collaboration
Successes:
The topic ideas are pretty good actually. The output of five headlines gives us three listicles that require little editing to be useful.
Failures:
The third output (What are some of the main content management issues that your company aims to solve?) seems more like an FAQ for handling sales objections. However, we can easily change this to read more like a blog post, such as How to Solve Common Content Management Issues.
Our overall opinion on the result of the test:
AI can give you some great ideas for blog posts, but you’ll need to change the “product description” to the general topic you want to cover, to generate new ideas each time.
Test #2. Blog post introduction paragraph
Next, let’s see how the AI writing tool does when we ask it to write our blog post introduction. We can select the number of outputs to get different options to choose from.
Here’s an example of writing AI output:
Starting a blog post with an interesting intro paragraph is tough. Writing one manually can be time consuming and tedious. Finding the right topic to write about can also be difficult if you don't have many ideas or don’t know how to generate more content ideas for your business. Fortunately, there are solutions that make writing easier and quicker than ever before - using artificial intelligence (ai) in the form of chatbots!
Successes:
The first three sentences in the above example are simple and to the point. Unlike common fears about AI, these don’t sound like they were written by a robot.
Failures:
While the first three sentences sound human enough, it is odd that all three begin with an -ing word. It creates a slightly unnatural flow.
Also, the paragraph includes “chatbots” which is totally irrelevant to the topic. And worse, there is an unnecessary exclamation point.
Our overall opinion on the result of the test:
When it comes to actual writing, the AI is less helpful than when it comes to ideating. However, with some quick editing, this intro paragraph is usable.
Test #3. Blog post outline
Next up, let’s see how Jasper does with ideating an outline.
An example of writing AI output for an outline is:
1. What is writing AI?
2. How does it work?
3. Why should I use it for my blog post?
4. Who can benefit from using ai-generated content on their website or blog?
Successes:
Between the five different outputs generated, the AI covers some basics, like the what, who, and why of the topic. The phrases are also pretty much ready to use.
Failures:
Each outline has only three or four points, so it’s disappointing that the outlines don’t get deep. You also can’t add more criteria as input, such as the familiarity level.
Our overall opinion on the result of the test:
All things considered, the outline feature can be used when writing a high-level overview or introduction to a topic. It likely can’t produce an outline for advanced content and thought leadership.
If you’re really stuck in the outlining phase, it does offer some quick wins to get your brain working again.
Test #4. Blog content improvements
While Jasper can’t yet write long-form content, it does offer content improvements. You can add up to 400 characters at a time, and have the text rewritten for you.
Here’s an example output:
Artificial intelligence has made its way into many industries, including the writing industry. Writing AI is artificial intelligence technology that analyzes large data sets in order to produce written content in desired formats. They require some direction; input is usually sentences and phrases meant to guide the AI’s output towards something relevant.
Most writing assistants today offer short form copy like headlines, bullet points, and short paragraphs.
Successes:
The writing AI has produced clear and informative copy. Unlike some of the other features where the outputs are very similar, the content optimizer produces very different options to choose from.
Failures:
Some sentences are a bit awkward or strangely worded, and the first option reads more like an introductory paragraph rather than an improvement on the input.
Our overall opinion on the result of the test:
If you have a blog post that you want to repurpose into a different post on a similar topic, this might help speed up some of the rewritings, so you’re not posting duplicate content.
Test #5. Social media promotional copy
So maybe AI can’t help you write an entire blog post. What about the promotional copy required to share the post on social media? Let’s see what happens when we use Jasper’s social media feature.
Here’s an example output (the only one somewhat usable):
Writing AI is very much in its infancy. Are you using a tool that will stand up to this brave new world? Or are you writing it yourself and hoping for the best?
Successes:
Unfortunately, this is the most disappointing use case so far. I had wrongly assumed it would be the best at writing social media copy, but alas, that’s not the case. The only good thing here is the ideas generated, not the copy. We can take this and use it to inspire posts with a definition of writing AI, what skills writing AI offers, and the cost-effectiveness of writing AI.
Failures:
The first post isn’t related to writing, the second is incomplete, the third is falsely confident, the fourth is so-so, and the fifth is completely crazy.
Our overall opinion on the result of the test:
Writing AI can’t generate social media copy for you (sorry). But it can offer some ideas. However, the cost of the subscription might not be worth it, since you can easily find prompts and ideas online.
Overall thoughts on Jasper’s capabilities
Jasper has several useful AI writing features. However, if you’re looking to use AI to write blog posts specifically, you’ll be disappointed by Jasper because you’ll have to do a lot of copying and pasting. When you use StoryChief, you get an AI writing tool directly inside of the same platform you’ll use to publish and promote your content—saving you a lot of time on your workflow.
Tool #3: Putting Copy.ai to the test
Now, we’re going to test a different AI writing tool in order to gauge its effectiveness and see whether or not its outputs are any better.
Let’s test the AI-generated outputs of Copy.ai, another popular tool.
We’ll still write about AI writing, partly to be super meta and partly to better compare the tool with Jasper.
Test #1. Blog title
For our first test, we’re generating some blog titles. I input this as the description of the blog topic in order to generate the titles, “AI writing, all about AI writing, everything you need to know about AI writing, how to write with AI.”
Here are some of my favorite headlines:
The AI Writing Companion: How To Write With AI
5 Things You Need To Know About AI Writing
How To Write With AI For 80% Of Your Writing Tasks
How To Get Started With AI-Based Writing Tools
Successes:
I was pretty surprised at how great some of these titles are. I like how it threw in that 80% stat. While not accurate, it does make for a great headline.
Failures:
There are plenty of silly titles here, like “Who I Am and What's the AI Writer,” which just proves that AI writing tools are unpredictable.
Our overall opinion on the result of the test:
Titles are probably what AI writing does best. It doesn’t matter that some of the titles are garbage. All you have to do is pick the ones you like best. But when writing paragraphs, the garbage text can take longer to edit than writing from scratch.
Test #2. Blog outline
For the blog outline, I used a similar input as above, except that I added steps in as well: “AI writing, all about AI writing, everything you need to know about AI writing, how to write with AI, steps to writing with AI.”
Here’s an example of the output:
Section: AI, or artificial intelligence, is a computer program that can solve problems or complete challenges.
Section: We are in a transition period, the transition from human writers to AI-powered writing.
Section: To get started with AI writing, you need to know your topic and tone.
Section: You can use artificial intelligence to write marketing copy about products and services for your business.
Section: You can use artificial intelligence to write blogs for your website.
Section: Come up with a topic.
Section: Brainstorm ideas for sections.
Section: Go to ContentStudio's AI Writing feature and enter the topic, tone, and sections.
Section: Click the Write button at the top of the page.
Successes:
There’s not much to celebrate here. Copy.ai generated 4 different outlines for my query, but none were usable.
Failures:
I was surprised by how poorly Copy.ai performed for the outline test. I would’ve thought that the output would’ve more closely resembled an outline, but most sections look more like sentences rather than headlines.
Our overall opinion on the result of the test:
You may get some ideas from the outline generator, but this AI assistant can’t actually write your outline for you.
Test #3. Blog intro
For this test, I used the same input as Test #2.
Here’s an example of the output:
What is AI writing? If you don't know, you've come to the right place. We'll cover different aspects of AI writing in this article. From how to write with it, to what AI writing actually is. Whether you're interested in using AI as a writing tool or just want the basic details behind it, this article will give you everything you need to know about AI writing.
Successes:
The above output certainly isn’t terrible (well, depending on who you ask). It does a great job with simplicity, ease of writing, and positive sentiment.
Failures:
The intro paragraph is pretty cheesy. It also doesn’t include any facts or statistics, which is commonplace in B2B blogs to establish authority and set the stage for a high-quality article.
Our overall opinion on the result of the test:
If you’re writing B2C content or your brand doesn’t really have an established brand voice and you prioritize productivity over style, you could use AI for writing a blog intro. Just be sure to not overdo it for paragraph text, otherwise, the whole article will read like copycat content.
Test #4. Blog paragraph
For this test, I used Copy.ai’s Freestyle feature, which can be used to generate longer paragraphs.
For the prompt input, I wrote, “Why AI writing is helpful and what it can be used for.” I wanted to see if it could write a paragraph about the benefits and use cases of AI writing.
Here’s an example of the output:
AI writing is a tool that can be used to automate the process of writing. It uses algorithms to generate content according to a set of parameters, which allows it to be used for many different purposes.
AI writing can help you improve your website's SEO, it can allow you to predict customer behavior, and it can even help you write your next novel!
Successes:
The writing sounds mostly natural, although it’s clearly not super high-quality writing.
Failures:
The second paragraph isn’t factual. While AI can help you predict customer behavior, writing AI cannot.
Our overall opinion on the result of the test:
The results of the test were better than I expected, but a lot of the content came off as really salesy and cheesy. I would recommend not using AI to write paragraphs, unless you’re stuck with writer’s block and would rather edit a few paragraphs than write them from scratch.
Test #5. Sentence rewriter
For this test, I asked the AI to rewrite its own sentence, “AI writing is a tool that can be used to automate the process of writing.”
Since that’s a short sentence, I was curious to see if the AI would produce anything more detailed or longer.
Here’s an example of the output:
AI writing is a tool that can be used to create writings that are indistinguishable from those created by humans.
Successes:
There are many options that match the sentence input in style and length.
Failures:
The outputs are pretty bland, but again if you care more about saving time than writing with style, you may not mind.
Our overall opinion on the result of the test:
Rewriting is one of the better uses of AI. But be careful when rewriting someone else’s content as it likely won’t pass plagiarism checkers. If you do use AI for rewriting, you should only do so for 30% or less of your blog. The majority of your blog should still be unique.
Overall thoughts on Copy.ai’s capabilities
Copy.ai could be used for AI-generated blog posts, but we wouldn’t recommend it. By far, the outputs have the lowest quality in terms of writing style and informativeness. Jasper and StoryChief both offer far better blog content quality. However, we’d recommend StoryChief for professional bloggers, content marketing teams, and content agencies because you get writing AI, SEO optimization, content collaboration and publishing in one place.
The Best AI Writing Tools
The AI writing assistant landscape is more powerful and diverse than ever. Here are some top tools in 2025:
- StoryChief – A full content marketing assistant: generate blog posts, press releases, social media content, job descriptions, outlines, and editorial briefs. Includes multilingual AI, brand-voice studio, SEO strategy planning, social‑media scheduling, and 24/7 AI assistant support
- Grammarly – Beyond grammar and spelling: now an AI productivity platform with email drafting, tone adjustment, style checking, plagiarism detection, and AI agents through its Superhuman acquisition
- ProWritingAid – Still a top grammar/style checker with added academic writing tools, readability analysis, and deep structure suggestions.
- Wordtune – AI21 Lab’s writing companion: rephrasing, tone shifts, context-aware suggestions, and full-sentence generation
- Writesonic – Lightning-fast long-form drafts (1,500 words in ~15 seconds), multilingual features, and rich templates for marketing content
- Copy.ai & Rytr – Handy for ad copy, social posts, and brand ideation; Copy.ai offers organic tone, Rytr is cost-effective and fast.
- Frase / Clearscope – SEO-first tools that analyze search intent, optimize structure and keywords, and create outlines backed by data.
- AI‑Writer – Still relevant for research-driven articles, fetching sources and writing integrated paragraphs.
- WordAI – Focused on rewriting and spinning paragraphs to be unique at scale.
- Notion AI – Built into Notion for summarization, drafting, and database autofill across notes and docs.
What Can an AI Writing Tool Do in 2025?
AI today can:
- Identify content gaps and high-impact keywords.
- Suggest angles, headlines, and full outlines.
- Autocomplete sentences, paragraphs, even whole sections.
- Speed up research by retrieving (mostly accurate) sources.
- Rewrite and repurpose text at scale.
- Refresh existing content to feel brand-new.
- Double output without doubling effort.
- Automatically optimize for SEO and readability.
- Conduct automated audits and A/B testing recommendations.
But AI still can’t write entirely solo—it needs your ideas, brand insights, and editorial oversight for:
- Fact-checking and accuracy.
- Consistent brand voice and nuance.
- Deep creativity, emotional subtext, and original thought.
What’s Next in AI Writing?
The future holds:
- AI that learns your unique voice from day one, tuning output to your brand's tone and style.
- Platforms ingesting proprietary content (e.g. thought leadership, white papers) to repurpose intelligently across formats.
StoryChief is already leading this wave with its AI Content Strategy Builder, Brand Voice Generator, multilingual capabilities, content calendar automation, and 24/7 AI assistance powered via its AI “William” agent.
Free tool: Analyze your target audience, brand voice, content pillars and competitors. Try it now.
Looking for more tool comparisons? Check out these resources:
