Otter vs Mida
A Mida alternative that stays flat as your traffic grows
Lightweight A/B testing with a free tier for small sites. Looking for a Mida alternative? Mida meters its paid plans on monthly tested users, from $224 a month billed annually. Otter charges a flat $39 to $149 a month with unlimited visitors. Here is a fact-checked look at how the two A/B testing tools compare.
The short answer
Which should you pick?
Both tools run experiments. The choice comes down to how you want to be billed and how much platform you need.
Otter
Choose Otter if…
- You want a bill that stays flat as traffic grows: $39/mo with unlimited visitors and unlimited active tests
- You want GA4 events as experiment goals, not just an event export to GA4
- You want revenue tracking with multi-currency conversion and a published statistical methodology
- You want sample size estimates and a sample-ratio-mismatch check built into your results
Mida
Choose Mida if…
- You're starting out and want a free plan for a low-traffic site
- You want the smallest possible script: Mida's is about 15KB compressed
- You need feature flags or server-side SDKs alongside web testing
About Mida
Pricing
Mida pricing in 2026
Mida publishes its prices and meters paid plans on monthly tested users: visitors who enter at least one live experiment, counted once a month. The free Sandbox covers up to 100,000 of them with tight test limits, and Growth steps up with each traffic band. Mida is A/B testing its own pricing page, so the page you see may differ from these prices.
| Mida plan | Price | What it includes |
|---|---|---|
| Sandbox | $0 | Up to 100,000 tested users, 2 live experiments and 2 goals per project, a control plus 1 variant, 2 projects, 60-day data retention, 50,000 tracked events a day. No card, no time limit. |
| Growth, 50K | $224/mo billed annually, or $299 monthly | Entry tier for 50,000 tested users. Unlimited experiments, variants, goals and retention, 5 projects. 15-day trial, no card. |
| Growth, 100K to 2M | $299 to $4,499/mo billed annually | $299 at 100K, $599 at 200K, $1,499 at 500K, $2,999 at 1M and $4,499 at 2M. Monthly billing costs about a third more ($399 to $5,999). |
| Enterprise | Custom | Unlimited tested users and projects, SAML SSO, an SLA, and a dedicated CRO consultant. |
Checked October 11, 2026 against Mida's pricing page. Otter is $39, $79 or $149 a month flat, with unlimited visitors on every plan.
Side by side
Feature comparison
| Feature | Otter | Mida |
|---|---|---|
| Starting price | $39/mo flat | Free Sandbox; Growth from $224/mo (annual) at 50K MTU |
| Visitor limits | Unlimited on all plans | Metered per monthly tested user (MTU) |
| Cost as traffic grows | Unchanged | Scales with MTU ($599/mo annual at 200K) |
| Active tests | Unlimited on all plans | 2 per project on Sandbox; unlimited on Growth |
| Variants per test | Unlimited | Control + 1 on Sandbox; unlimited on Growth |
| Projects | 1, 5 or unlimited, by plan | 2 on Sandbox; 5 on Growth |
| Data retention | Kept while your account is active, or a window you set | 60 days on Sandbox; unlimited on Growth |
| A/B and A/B/n testing | ||
| Split URL testing | ||
| Visual editor | ||
| Content personalization | Targeted personalization test type | Listed on Growth |
| Feature flags | ||
| Multi-armed bandits | On Growth plan and above | |
| Revenue tracking | Built-in, with multi-currency conversion | |
| GA4 integration | Sends events to GA4; GA4 events usable as experiment goals | Sends events to GA4 |
| Statistical methodology | Manual split: frequentist or Bayesian; bandit: Bayesian | Statistical engine advertised; we found no published methodology |
| Script size | About 32 KB gzipped | About 15KB compressed |
| Free trial | 14 days, no credit card | Free tier; 15-day Growth trial, no card |
| Transparent, published pricing |
We make Otter, so we've kept to facts you can check. Mida details reflect its public pricing page and integration docs as of October 2026 (prices checked October 11, 2026, while Mida was A/B testing that page). Features and pricing change, so confirm on mida.so before you buy.
In detail
Where Otter and Mida actually differ
Mida pricing vs Otter's flat plans
Mida deserves credit for doing what most testing vendors won't: publishing real prices. Its free Sandbox covers up to 100,000 monthly tested users, with two live tests and two goals per project, a control plus one variant, two projects and 60 days of data retention. Growth now starts at a 50K tier for $224 a month billed annually ($299 monthly), then costs $299 a month at 100K, $599 at 200K and $1,499 at 500K (annual prices). Mida is running an A/B test on its own pricing page, so the plan names and prices you see may differ; ours were checked on October 11, 2026.
Otter's model is flat: $39/mo for one project, $79/mo for five, $149/mo for unlimited projects, with unlimited visitors and unlimited active tests on every plan. The math is simple. For a low-traffic site running one or two experiments, Mida's free tier is hard to beat. For a site with real traffic, or one that expects growth, a bill that never moves beats a meter that rises when your marketing works. Every plan is listed on our pricing page.
What's genuinely comparable, and what isn't
Both tools cover the core well: visual editor, split URL tests, revenue tracking and multi-armed bandit traffic. Mida's script is smaller, about 15KB compressed with anti-flicker technology. Otter's SDK is about 32 KB gzipped, loads async, and hides the page until variants apply, with a 3-second failsafe. Mida also offers feature flags and server-side SDKs; Otter has neither.
Otter's advantages sit in the measurement layer. Content personalization is a first-class test type: build a targeted variant in the visual editor and serve it to a segment. Revenue goals convert multiple currencies into one reporting currency. And six goal types (pageview, click, custom event, revenue, DataLayer event, GA4 event) mean conversions already tracked on your site or in GA4 plug in directly as experiment goals. Mida's GA4 integration, per its integration page, works the other way: it sends Mida's events into GA4.
Statistics you can audit
Otter publishes exactly how results are computed. Manual-split experiments can use frequentist analysis (a two-proportion z-test, or Fisher's exact test for small samples, at 80/90/95/99% confidence) or Bayesian chance-to-beat reporting. Multi-armed bandit experiments use Bayesian reporting automatically and do not auto-stop when a winner is declared. Visitor and conversion caps remain available for either traffic method.
Mida advertises a statistical engine, but when we checked in July 2026 we couldn't find its methodology documented publicly. That doesn't mean it's wrong; it means you can't audit it. If your team needs to defend results to stakeholders, a published methodology matters. You can check any result yourself with our free significance calculator.
Is Otter the right Mida alternative?
Otter suits teams that have outgrown a free tier and want testing on a fixed budget: unlimited tests and variants, revenue per visitor and average order value for every variant, GA4 goals, and a REST API and MCP server on every plan. Mida suits teams that want the smallest script, a free plan, or feature flags.
Both tools use a single script tag and a visual editor, so migration is mostly mechanical: install the Otter snippet, rebuild your active tests in the Otter wizard, let in-flight Mida experiments finish, then remove the Mida snippet. Historical results stay in Mida, so export or screenshot anything you'll want later.
Verdict
The bottom line
Mida is a credible, transparently priced competitor with a generous free tier and a very small script. For small sites, it's a reasonable place to start. Both tools support adaptive bandit traffic, and Mida's feature flags and server-side SDKs are real differentiators.
Otter wins on the economics of growth and the measurement stack: flat per-project pricing with unlimited visitors and tests, GA4 events as goals, multi-currency revenue tracking, personalization, and a fully published statistical methodology.
If your traffic is small and your needs simple, use Mida's free tier. When testing becomes part of how you operate, Otter's flat pricing and deeper measurement are built for that. For more options, see our guide to A/B testing tools.
Questions
Otter vs Mida — common questions
How much does Mida cost?
Is Otter cheaper than Mida?
Does Mida support unlimited active tests?
Can I migrate from Mida to Otter?
Does Otter really have no visitor limits?
Keep comparing
Other A/B testing tools teams weigh up
Switching is quick
Try Otter free for 14 days
No credit card required. No visitor limits. Set up in under five minutes.
- 14-day free trial
- No credit card required
- Cancel anytime