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About

How can you stand out in the inbox? Get more opens? Compare it to 100,000+ other emails sent by marketers like you. You may be able to improve with some tweaks. A measure of how easy-breezy it is to read your subject line. Don't shy away from using well known industry specific terms, just don't make it complicated. Reading Grade Level is a mixture of word choice, complexity and length. Writing at a lower level tends to generate more opens. How many words in your subject is less important than the right words. Keep it specific. Focus on what your reader will get out of opening this email. Just don't make it too short (hurts opens) and if you go long, try and put multiple CTAs or value propositions into the subject. Putting a fake RE: or FWD: at the beginning of your subject may temporarily boost open rates, but is not recommended unless you're actually responding to an email. Many email clients and anti-spam systems have begun flagging these as suspicious.

About

Sendlens is an email marketing analytics platform for marketing and content teams tired of ESP reporting that stops at opens and clicks. Connect ActiveCampaign, Brevo, or any combination of sending tools and Sendlens unifies every broadcast and automated flow into one dataset. Each send is automatically fingerprinted across subject-line style, body length, CTA placement, and layout, then auto-clustered into meaningful peer groups. The pattern discovery engine surfaces the creative structures behind your best opens, clicks, and conversions, and conversion attribution ties each send to downstream revenue per campaign, cluster, and flow step. Built for ecommerce brands, creative agencies, and media companies who take email seriously.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Companies requiring an email testing platform

Audience

B2B

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

No images available

Pricing

No information available.
Free Version
Free Trial

Pricing

No information available.
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Send Check It
sendcheckit.com/email-subject-line-tester

Company Information

Sendlens
Founded: 2026
The Netherlands
sendlens.com

Alternatives

Alternatives

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Inbox Pirates

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ConversionRuler

ConversionRuler

MarketRuler
Trackier

Trackier

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Litmus

Litmus

Litmus Software
CampaignTrackly

CampaignTrackly

Leafwire Digital

Categories

Categories

Integrations

ActiveCampaign
Brevo

Integrations

ActiveCampaign
Brevo
Claim Send Check It and update features and information
Claim Send Check It and update features and information
Claim Sendlens and update features and information
Claim Sendlens and update features and information