Otter A/B vs Mida
Lightweight A/B testing with a generous free tier. Here's an honest look at how we compare.
About Mida
Mida is a client-side A/B testing tool with a free plan for up to 100K monthly tested users. It offers a visual editor, split URL testing, and feature flags. The free tier is limited to 2 active tests and 2 projects, but it's a reasonable starting point for small sites.
Feature comparison
| Feature | Otter A/B | Mida |
|---|---|---|
| Starting price | $39/mo | $0 (free tier) / $199–$399/mo (Growth) |
| Visitor limits | Unlimited on all plans | 100K MTU free, scales with paid tier |
| Overage charges | None | Must upgrade tier for more MTU |
| Projects included | 1–Unlimited (by plan) | 2 free, 5 Growth, Unlimited Enterprise |
| Active tests (free tier) | Unlimited | 2 |
| Billing model | Flat rate per project | Per monthly tested user (MTU) |
| A/B testing | ||
| Split URL testing | ||
| Visual editor | ||
| Revenue tracking | ||
| Statistical engine | ||
| Anti-flicker solution | Built-in | Manual snippet (not built-in) |
| Feature flags | ||
| Server-side variant assignment | ||
| Transparent, published pricing | ||
| GDPR compliance | GDPR-friendly (per their site) |
Information based on publicly available data as of March 2026. Features and pricing may change — check Mida's website for the latest.
The bottom line
Mida's free tier is a strong entry point for small sites under 100K monthly visitors. Once you grow past that, pricing jumps to $199–$399/mo with ongoing MTU caps.
Otter A/B charges a flat rate per project with no visitor limits. For sites with growing traffic, this means predictable billing that doesn't scale with your success.
On the technical side, Otter A/B uses server-side variant assignment for consistent bucketing across sessions and devices, while Mida assigns variants in the browser using client-side JavaScript.