PASS

PASS

NCSS
+
+

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About

ABTestly is an A/B testing platform for teams that ship experiments in code rather than through a visual editor. You write each variation as real JavaScript and CSS. Experiments live in your repository and go through the same review as any other change. The runtime is about 31 KB gzipped, and the page is held until the variation is applied, so visitors do not see the control flash first. Assignment, exposure and conversion are recorded as three separate events on an exact ledger rather than one inferred number, so results stay auditable. Confidence intervals are shown with the sample size, no winner is declared before significance, and sample ratio mismatch is detected and flagged. Three statistics engines: frequentist on every plan, sequential and Bayesian from Pro upwards. Also a speed guardrail comparing p75 LCP against control. Pricing is published: $99 a month at 50,000 tracked users, $249 at 200,000, $549 at 500,000, with a 14-day trial on monthly plans.

About

PASS software provides sample size tools for over 1100 statistical test and confidence interval scenarios - more than double the capability of any other sample size software. Each tool has been carefully validated with published articles and/or texts. Get to know PASS by downloading a free trial, viewing the video to the right, or exploring this website. PASS has been fine-tuned for over 25 years and is now the leading sample size software choice for clinical trials, pharmaceuticals, and other medical research. It has also become a mainstay in all other fields where sample size calculation or evaluation is needed. In PASS, you can estimate the sample size for a statistical test or confidence interval in a few short steps. If you need guidance during any of the steps, PASS has excellent documentation, there are free training videos, and you can contact our team of Ph.D. statisticians.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Supported
Mac Not Supported
Linux Not Supported
Cloud Not Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Software engineering and CRO teams at ecommerce and SaaS companies who write their own test variations in code, and agencies running experiments for client sites.

Audience

Companies searching for a solution providing sample size tools for over 1100 statistical test and confidence interval scenarios

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

$99/month
Free Version Not Supported
Free Trial Supported

Pricing

$395 per year
Free Version Not Supported
Free Trial Supported

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 Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

ABTestly
Founded: 2025
abtestly.com

Company Information

NCSS
Founded: 1983
United States
www.ncss.com/software/pass/

Alternatives

No Alternatives

Alternatives

ChemStat

ChemStat

Starpoint Software
Oriana

Oriana

Kovach Computing Services
nQuery

nQuery

Statistical Solutions

Categories

AB Testing Supported

Categories

Statistical Analysis Features

Analytics Supported
Association Discovery Supported
Compliance Tracking Supported
File Management Not Supported
File Storage Supported
Forecasting Supported
Multivariate Analysis Supported
Regression Analysis Supported
Statistical Process Control Supported
Statistical Simulation Supported
Survival Analysis Supported
Time Series Supported
Visualization Supported

Integrations

No info available.

Integrations

No info available.
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