Caliper | Email Benchmark Tool: Benchmark Your Email. Fix What Matters. Send with Confidence.
Caliper grades your subject line, preheader, offer and body against real promotional emails from leading brands. Free preview in seconds. Unlock the full report with your work email.
Emails analyzed
Brands
Industries
How It Works
No account needed for the preview. No LLM guessing: scoring is deterministic and repeatable.
Paste Your Email
Subject, preheader and body HTML. Add a screenshot to grade the creative itself.
Compare to Your Category
Every signal is measured against emails sent in your industry, falling back to all 20 when data is thin.
Get a Prioritized Fix List
Each finding is tagged critical, warning or OK, with your value next to the category median.
The Score
What Caliper Measures
The composite score is a weighted blend of five dimensions, each measured against your category.
Subject Line
Length, tone, hook and emoji use against your category.
What We Check
Preheader
Whether the preview text adds to the subject instead of repeating it.
What We Check
Offer & Framing
How clearly the offer is stated and framed against your category.
What We Check
Email Copy (Body)
Copy length, calls to action, accessibility and compliance.
What We Check
Visual & Creative
Contrast, legibility and how much of the message lives in images.
What We Check
See Where Your Next Send Stands
Paste an email, get a free preview score, and unlock the full report with your work email.