Your AI Copywriter Has No Idea If It Worked
You've used Jasper. You've used Copy.ai. Maybe Writesonic. They all do the same thing: produce text fast. The output looks reasonable, passes the eye test, and goes out the door. What you don't get is any signal about whether it will resonate with the actual people reading it.
That's not a small gap. Different people process persuasion differently. A high-Conscientiousness buyer responds to specifics, proof, and process. A high-Openness buyer tunes out when you lead with credentials and wants the concept first. When your copy speaks to one personality type and ignores the others, you're leaving real conversion on the table—and you can't see it because your tool doesn't measure it.
The problem isn't that AI writers are bad at writing. It's that writing quality and psychological fit are two separate things. A grammatically perfect email that misses your audience's personality profile will underperform a rougher draft that actually matches how they think. No AI copywriter on the market measures that gap. COS is the only one that does.
Generate, Score, Know
COS does three things in sequence. No other tool does all three.
| Left column: What happens | Right column: What you get |
|---|---|
| Generate — describe your audience, your product, your goal. COS writes the copy. | A first draft calibrated to the audience personality profile you defined—not a generic middle. |
| Score — COS maps the draft against all five OCEAN dimensions for your target audience. | A coverage score showing which personality dimensions the copy activates and which it leaves cold. |
| Know — low coverage on a dimension triggers specific rewrite suggestions for that gap. | Copy you can defend. "This email is optimized for high-Conscientiousness and high-Openness buyers" is a sentence you can now say accurately. |
Concrete example: A SaaS email targets a Conscientiousness-heavy enterprise buyer segment. The first draft scores well on Conscientiousness (precision language, ROI framing) but low on Agreeableness (no social proof, no team outcome framing). COS flags the gap and suggests adding peer validation language and team-benefit framing. The revised draft covers four of five dimensions cleanly. That's a different email—and a measurably better one.
What OCEAN Has to Do With Your Copy
The Big Five (also called OCEAN) is a personality framework built from decades of research across cultures, industries, and job types. It measures five stable dimensions: Openness to experience, Conscientiousness, Extraversion, Agreeableness, and Neuroticism. These aren't types—they're continuous scales, and your buyers sit somewhere on each one.
Why it matters for copy: the Big Five predicts how people process information, respond to risk framing, weight social proof, and react to urgency. A buyer high in Openness wants concept and implication. A buyer high in Conscientiousness wants evidence and process. Write for one and ignore the other, and half your audience bounces before the CTA.
Most B2B content is written for the writer's personality, not the reader's. COS fixes that by scoring what your copy actually communicates against what your audience actually needs to hear.
The Coverage Score
The coverage score is a dimensional map of your copy. It shows how well your text addresses each of the five OCEAN personality traits in your defined audience profile—scored on a 0–100 scale per dimension.
How it works: COS analyzes the language patterns, framing choices, emotional tone, and evidence structures in your copy. It compares those signals against what each personality dimension responds to, weighted by the audience profile you set. A high-Conscientiousness audience weights process language, specifics, and logical sequencing. A high-Agreeableness audience weights social validation and collaborative framing. The score reflects how well your copy delivers what each dimension needs.
What a good score looks like: No copy covers all five dimensions at maximum depth—that would read as incoherent. A strong score is 70+ on the dimensions that matter most for your audience, with no critical dimension at zero. Zero coverage on a dimension your target audience scores high on is the failure mode COS is built to catch.
Before/after framing:
Before: Cold email to enterprise security buyers scores 82/100 on Conscientiousness, 71/100 on Neuroticism (risk framing), 18/100 on Agreeableness, 23/100 on Openness. COS flags the low Agreeableness score—your audience includes procurement leads who need team-benefit language and consensus framing, not just technical ROI.
After rewrite with COS suggestions: Agreeableness score moves to 67/100. The email now addresses how the purchase affects the team, not just the bottom line. Two paragraphs changed. The mechanism that was missing is now present.
What COS Does
AI Copy Generation Describe your audience, channel, and goal. COS writes first-draft copy calibrated to your defined personality profile—not a generic average.
OCEAN Audience Profiling Define your target audience's personality dimensions using job role signals, behavioral data, or your own knowledge of the segment. COS uses that profile to score and rewrite.
Coverage Scoring Every piece of copy gets a dimensional score across all five OCEAN traits. You see exactly which dimensions your copy activates and which it misses—before the copy goes live.
Rewrite Suggestions Low coverage on a dimension triggers specific, actionable suggestions: what to add, what framing to change, what language pattern is missing. Not "make it better." Make it more Conscientious. Add Agreeable signaling. Here's how.
Team Collaboration (Intelligence tier) Multiple team members work inside a shared audience profile. Brand voice is consistent because everyone is scoring against the same psychological benchmark, not their own instincts.
Channel Variants Generate dimension-calibrated variants for email, ad copy, landing pages, and LinkedIn from the same brief. The core psychological fit holds across channels—the format adapts.
Where Teams Use COS
Website Copy Your homepage speaks to one personality type and ignores the rest. COS scores your existing copy and shows you the gaps before a full rewrite — learn more about website copy.
Email Copy Cold outreach and nurture sequences fail when they match the sender's personality, not the receiver's. COS scores each email against the segment it's going to — learn more about email copy.
Ad Copy Ad creative that doesn't resonate at the personality level burns budget. COS maps your ad copy against your target audience's OCEAN profile before you spend — learn more about ad copy.
Brand Voice Brand voice guidelines describe style, not psychology. COS adds the psychological layer—defining which OCEAN dimensions your voice should activate and measuring whether it does — learn more about brand voice.
Pricing
Signal
$0/month
Try the mechanism before you commit.
- 3 analyses per month
- AI copy generation
- Coverage score (single analysis)
- All 7 frameworks
- Markdown export
- History: 7 days
Analyst
$99/month · or $82/mo billed annually
For practitioners who score and ship copy regularly.
- 200 analyses per month (+ $0.20 per overage analysis)
- AI copy generation
- OCEAN audience profiling
- Coverage scoring across all 5 dimensions
- Rewrite suggestions per dimension gap
- Unlimited history
- All export formats (PDF, DOCX, CSV, MD, TXT)
- Manual SEO keyword input
Strategist
$199/month · or $166/mo billed annually
For content teams running campaigns at scale.
- 500 analyses per month (+ $0.15 per overage analysis)
- Everything in Analyst
- 50 batch analyses per month
- 20 content briefs per month
- 100 Site Manager pages
- Cannibalization alerts + Page Value scoring
- Read-only API access
- Up to 3 team members
- Google GSC + Ads keyword integration
- White-label exports
Intelligence
$499/month · or $416/mo billed annually
For teams running copy at scale with shared audience profiles.
- 2,000 analyses per month (+ $0.12 per overage analysis)
- Everything in Strategist
- 200 batch analyses per month
- 100 content briefs per month
- 500 Site Manager pages
- Full API access (read + write)
- Voice profiles
- Priority processing
- Up to 10 team members
- White-label + branded exports
Switching From Another Tool?
Jasper, Copy.ai, and Writesonic all generate copy. None of them score it. If you've been writing and shipping without knowing whether the copy fits your audience's psychology, the coverage score will show you what you've been missing.
- COS vs. Jasper — honest comparison
- COS vs. Copy.ai — honest comparison
- COS vs. Writesonic — honest comparison
Questions
How is COS different from Jasper? Jasper generates copy fast. So does COS. The difference is what happens after generation: COS scores the output against your audience's personality profile and tells you which psychological dimensions the copy addresses and which it misses. Jasper has no equivalent mechanism. You can use both—Jasper to draft quickly, COS to know whether the draft will land.
How does COS compare to Acrolinx? Acrolinx enforces brand language consistency—it checks whether copy follows your style guide. That's a different problem from psychological fit. A piece of copy can be fully on-brand by Acrolinx's measure and still miss the mark psychologically for a specific audience. COS measures whether the copy activates the personality dimensions your audience actually responds to. The two tools address adjacent but separate problems.
What is a coverage score? It's a dimensional score, 0–100, showing how well your copy addresses each of the five OCEAN personality traits for your defined audience. High Conscientiousness coverage means your copy delivers the specificity, process language, and evidence that buyers high in Conscientiousness need. Low coverage on a dimension your audience scores high on is a concrete gap—and COS tells you how to close it.
Does COS work for B2B and SaaS copy? Yes. B2B and SaaS copy tends to default to Conscientiousness (features, ROI, process) while leaving Agreeableness (team outcomes, peer validation) and Openness (concept, implication) undercovered. Enterprise buyers aren't one personality type—a buying committee includes the CFO, the practitioner, and the champion, and they score differently on OCEAN. COS helps you write copy that covers the dimensions the full committee needs, not just the primary decision-maker.
What if I don't know my audience's OCEAN profile? You don't need a psychometric report. COS builds audience profiles from job-role signals, industry context, and behavioral markers you already know. "Senior engineers at mid-market SaaS companies" is enough to generate a working profile. You refine it as you learn more.
Can COS rewrite copy automatically based on the score? Yes. Low coverage on any dimension triggers specific rewrite suggestions—not generic "improve this" notes, but targeted language guidance: what framing to add, what evidence type to include, what structural change addresses the gap. You apply the suggestions or ask COS to apply them and re-score.
Most Copy Fails Silently. Yours Doesn't Have To.
You've been writing and publishing without knowing which personality dimensions your copy misses. The coverage score shows you exactly where—and what to do about it.