Sienna vs. accessiBe: A Transparent Comparison

When looking for a web accessibility widget, business owners and developers are often forced to choose between heavy, expensive corporate solutions and doing nothing at all.

accessiBe is currently the largest player in the overlay market. They spend heavily on advertising and employ aggressive sales tactics fueled by the fear of ADA compliance lawsuits.

Sienna is an open-source, indie-developed alternative. We believe accessibility should be lightweight, privacy-respecting, and free of exorbitant subscriptions.

Here is a factual, technical breakdown of how the two solutions compare.

1. Performance & Payload (The Developer View)

One of the biggest complaints regarding accessiBe is its impact on website performance.

• accessiBe: When deployed, it aggressively injects a mountain of obfuscated JavaScript into the browser. This can download hundreds of kilobytes of data, run heavy client-side DOM mutations, and severely degrade Lighthouse performance scores and Core Web Vitals.
• Sienna: Built for speed. Sienna is pure, vanilla JavaScript with zero dependencies. The core script footprint is highly optimized for Core Web Vitals, with a nearly undetectable impact on site performance.

2. Privacy & User Tracking

• accessiBe: Like many corporate overlays, accessiBe utilizes cookies and tracking mechanisms to monitor session states and user behavior across websites to power their analytics dashboards.
• Sienna: Sienna respects user privacy. Our widget is strictly UI-driven. While it can bridge to your own Google Analytics (GA4) for event tracking, it never profiles your visitors or stores their data on its own servers. It is inherently GDPR, CCPA, and COPPA compliant.

3. Pricing Models

This is perhaps the starkest difference between the two products.

• accessiBe: Operates on a strict recurring subscription model. Their standard plan starts at $490 per year per website. If your website has more than 1,000 pages, the price scales up to $1,490 to $3,490 per year. They effectively tax your growth.
• Sienna: The core Sienna widget is free and open-source forever. Our Pro and Business plans include unlimited pageviews—we never charge you based on your website’s traffic or page count. You pay for features and websites, not for your popularity.

4. White-Labeling for Agencies

• accessiBe: Requires loading scripts from their own CDN servers, creating a 3rd-party dependency. Removing their branding or repackaging it internally is highly restricted or reserved for massive enterprise agreements.
• Sienna: We actively encourage white-labeling and Self-Hosting. Our Enterprise Plan allows you to host the script on your own servers, completely remove Sienna’s branding, and deploy it across an unlimited number of client websites for a flat monthly rate (billed annually).

Conclusion

If you want a highly marketable corporate tool and don’t mind paying $500/year while sacrificing your website’s load speed, accessiBe is the industry giant.

If you are a developer or agency who values clean code, fast load times, rigid data privacy, and ethical pricing, Sienna is built exactly for you.