Otter vs VWO Testing
| Otter | VWO Testing | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | Yes |
| Paid from | — | — |
| Open source | No | No |
| Platforms | Web | Android, api, iOS, self-hosted, Web |
| Free plan | No | No |
| Paid from | 49 /mo | — |
| Test types | Split URL / Redirect, A/B/n, Content Personalization, WordPress Theme Test | A/B, multivariate, split URL, multi-page, cross-domain, device-specific, and AI-assisted experiments |
| Supported platforms | web | web_and_mobile |
| Visual editor | Yes | Yes |
| Server-side testing | Yes | Yes |
| Audience targeting | Yes | Yes |
| Feature flags | No | Yes |
| Mobile SDK | — | Yes |
Both are listed in Best A/B Testing Tools. On Samsung Mobile US Press, VWO Testing scores higher on our published basis.