#1 Fastest in the market. 14 day free trial.
4.8 on G2

A Convert alternative that starts below $399/mo.

As of Aug 31, 2026, Convert lists Growth at $399/mo ($299 annual) and Pro at $599/mo ($420 annual) for 100k MTU with a 15‑day trial and no free plan. Stellar is 5.4KB, publicly priced, and starts in a $0 Sandbox (5k MTU, 1 experiment) so you can try it before you commit.

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No credit card required 5.4KB script — lightest in the market Privacy-conscious, cookieless by default
Works with every platform
ShopifyWebflowGoogle AnalyticsWordPressWixCustom website
Convert

Capable testing with a lighter tag and public pricing.

Stellar is web A/B testing that is easy to start and priced in the open. 5.4KB script, native GA4, and a $0 Sandbox (5k MTU, 1 experiment). If you need MVT, full‑stack, or session replay, stay with Convert.

5.4KB script

Async, CDN‑served tag designed to keep Core Web Vitals intact.

Start in a Sandbox

$0 for up to 5,000 MTU and 1 experiment so you can try before you commit.

Public pricing

Pro from $99. Around $199 at 100k MTU. Convert lists Growth at $399/mo and Pro at $599/mo (as of Aug 31, 2026).

Visual editor

No‑code changes to text, images, and layout on the live page, with optional custom JS and CSS.

Performance

The lightest A/B testing script in the market.

At just 5.4KB and served on a CDN. Zero fuss install, designed for Core Web Vitals.

5.4KB
Script Size
16ms
LCP Impact
CDN
Delivery
Stellar (0ms)
VWO (100ms)
Optimizely (150ms)
ABlyft (180ms)
Convert (200ms)

At just 5.4KB and served on a CDN, Stellar's pure JS script is 25x smaller than competitors like VWO or AB Tasty. With minimal dependencies and a fixed size regardless of test count, it preserves your website's speed, Core Web Vitals, user experience, and SEO performance.

Frequently Asked Questions

Still comparing Convert? Let's talk.

Book a 30‑minute call and we'll show you how Stellar compares for your traffic and stack.

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