# Experimentation and personalization: what AI models recommend, September 2026

Gane Index, September 2026 Edition. Asked as "website experimentation and personalization platform" and as "A/B testing and personalization tool", six framings each, to six frontier models with search on, on behalf of a mid-market B2B software company. Page: https://www.gane.ai/index/gtm/marketing/experimentation-and-personalization/2026-09-expanded

This is the permanent record of the September 2026 Edition, published September 9, 2026 and superseded since. The current standing: https://www.gane.ai/index/gtm/marketing/experimentation-and-personalization/index.md

**Standing:** VWO leads with 42% of first choices; verdict clear leader. 26 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| Rank | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | [VWO](https://www.gane.ai/index/gtm/vendors/vwo/index.md) | 42% | 13% | 30 |
| 2 | [GrowthBook](https://www.gane.ai/index/gtm/vendors/growthbook/index.md) | 8% | 0% | 17 |
| 3 | [Convert Experiences](https://www.gane.ai/index/gtm/vendors/convert-experiences/index.md) | 8% | 8% | 12 |
| 5 | [AB Tasty](https://www.gane.ai/index/gtm/vendors/ab-tasty/index.md) | 8% | 27% | 22 |
| 8 | [Optimizely CMS](https://www.gane.ai/index/gtm/vendors/optimizely-cms/index.md) | 8% | 54% | 24 |
| 10 | [Statsig](https://www.gane.ai/index/gtm/vendors/statsig/index.md) | 0% | 14% | 21 |
| 11 | [LaunchDarkly](https://www.gane.ai/index/gtm/vendors/launchdarkly/index.md) | 0% | 6% | 16 |
| 12 | [Kameleoon](https://www.gane.ai/index/gtm/vendors/kameleoon/index.md) | 0% | 0% | 11 |
| 15 | [Dynamic Yield](https://www.gane.ai/index/gtm/vendors/dynamic-yield/index.md) | 0% | 30% | 10 |
| 20 | [Adobe Target](https://www.gane.ai/index/gtm/vendors/adobe-target/index.md) | 0% | 40% | 15 |
| 61 | [Google Optimize](https://www.gane.ai/index/gtm/vendors/google-optimize/index.md) | 0% | 70% | 10 |

Rank is by share of first choices among all 61 products named; products with the same share are tied, and the order among them carries no meaning. The table lists those with at least 10 labels.

## Each model's first choice on the direct prompt

- Claude Opus 5: VWO; alternatives AB Tasty, GrowthBook, Kameleoon, Mutiny
- Claude Opus 4.8: AB Tasty, VWO; alternatives Mutiny, Statsig
- GPT-6 Astra: VWO; alternatives Convert Experiences, Webflow Optimize
- GPT-5.6 Sol: VWO; alternatives Convert Experiences, Kameleoon, Mutiny
- Gemini 3.1 Pro: Mutiny; alternatives Convert Experiences, PostHog, VWO
- Perplexity Sonar Pro: Convert Experiences, VWO; alternatives AB Tasty, Statsig

## Sources the answers cite

32 of 36 answers came back with a source list, from 6 of 6 models. Sites named in the most answers:

- vwo.com: 19 answers, 28 citations
- convert.com: 15 answers, 22 citations
- growthbook.io: 14 answers, 24 citations
- statsig.com: 12 answers, 24 citations
- amplitude.com: 10 answers, 12 citations
- cxl.com: 10 answers, 11 citations
- mida.so: 9 answers, 11 citations
- optimizely.com: 8 answers, 9 citations

Pages named in the most answers:

- https://cxl.com/blog/ab-testing-tools (9 answers)
- https://convert.com/blog/a-b-testing/top-ab-testing-tools (7 answers)
- https://guideflow.com/blog/ab-testing-tools (7 answers)
- https://qualaroo.com/blog/best-ab-testing-tools (7 answers)
- https://amplitude.com/compare/best-product-experimentation-tools-for-startups (6 answers)
- https://brillmark.com/best-ab-testing-tools-for-cro-experimentation-agencies (6 answers)
- https://gartner.com/reviews/market/a-b-testing-tools (6 answers)
- https://convert.com/blog/a-b-testing/ab-testing-tools-for-growth-teams (5 answers)
- https://statsig.com/comparison/best-experimentation-tools-marketers (5 answers)
- https://vwo.com/blog/ab-testing-tools (5 answers)

## Warned against

- Optimizely CMS: 13 of 24 labels negative. "What I'd rule out: Optimizely, unless you have unusual scale or budget" (Claude Opus 5, paraphrase prompt)
- Google Optimize: 7 of 10 labels negative. "Google Optimize is the most famous cautionary tale — Google discontinued its free (and 360) A/B testing and personalization tool in September 2023" (Claude Opus 4.8, negative prompt)
- AB Tasty: 6 of 22 labels negative. "VWO and AB Tasty: These two major competitors were merged by Everstone Capital in early 2026." (Gemini 3.1 Pro, negative prompt)
- Adobe Target: 6 of 15 labels negative. "usually capable but expensive, slow to implement, and only sensible if you're already committed to that stack" (Claude Opus 5, negative prompt)

## Record

- Method: https://www.gane.ai/index/gtm/methodology
- License: CC BY 4.0. Cite as Gane Index, September 2026 Edition, www.gane.ai/index/gtm.