Both tools run A/B tests. The differences start with price and end with who they were built for. Here's the full breakdown so you pick the right one — whichever that turns out to be.
No asterisks, no fine print. Both products are mature and capable — but they serve different audiences.
| Dimension | Optimizely (Web Experimentation) | Testio |
|---|---|---|
| Target customer | Mid-market to enterprise | Startups, SMBs, solo founders |
| Entry price | Sales-quoted, typically $2,000+/mo · $36,000+/year | $9/month, self-serve |
| Free trial | Demo only (sales call required) | 3 days, no credit card |
| Setup time | Days to weeks (sales cycle + onboarding) | Under 15 minutes |
| Self-serve signup | ✗ (sales-led) | ✓ |
| Visual editor (no code) | ✓ | ✓ |
| Client-side A/B testing | ✓ | ✓ |
| Server-side / Full Stack experimentation | ✓ (separate product) | ✗ (client-side only) |
| Statistical engine | Stats Engine (sequential), Bayesian, Frequentist | Z-test + Bayesian probability-to-be-best |
| Automatic winner declaration | ✓ | ✓ |
| Multi-armed bandits | ✓ | ✗ |
| Personalization engine | ✓ (separate product) | ✗ |
| Device / geo / source targeting | ✓ | ✓ |
| Team roles / permissions | Advanced | 5 roles (Viewer / Editor / Admin / Owner / Superadmin) |
| Audit logs | ✓ | ✓ |
| Installation | JS snippet or server SDK | Single 5KB JS snippet |
| Impact on Core Web Vitals | Minimal with proper async loading | None (5KB async snippet, ~100ms anti-flicker) |
| Native Spanish UI | ✗ | ✓ |
| Cancel anytime (no phone call) | ✗ (contract-based) | ✓ |
We've included honest "choose Optimizely" recommendations because we want you to end up with the right tool — not just ours.
Both companies publish their own numbers differently. Here's what you actually pay, based on public information and industry quotes.
| Team size | Optimizely (est.) | Testio |
|---|---|---|
| Solo / freelancer | Not served | $9/mo (Starter) |
| Startup (2–10) | ~$2,000/mo minimum | $29/mo (Growth) |
| SMB (10–50) | ~$3,000–5,000/mo | $29–$299/mo |
| Mid-market (50–500) | $36,000+/year ($3,000+/mo) | $299/mo (Enterprise) |
| Enterprise (500+) | $100,000+/year typical | Custom (contact us) |
Optimizely does not publish pricing publicly; figures above are industry-reported ranges. Testio's prices are listed in the public pricing table.
Yes. Testio starts at $9/month with self-serve signup. Optimizely's Web Experimentation product is sales-quoted and typically starts around $2,000/month for mid-market, often $36,000+/year for enterprise. For small teams and startups, the price gap is one to two orders of magnitude.
Choose Optimizely if you have a dedicated CRO team, need server-side (Full Stack) experimentation with SDKs in 10+ languages, run multi-armed bandit experiments at scale, or require deep personalization tied to user profiles. Optimizely is the right tool for companies with $500k+/year CRO budgets and complex governance needs.
Choose Testio if you are a startup, small business, or marketing team that wants to run client-side A/B tests (no engineering required), launch tests in minutes, and pay $9–$299/month flat. Testio is designed to be simple and fast; Optimizely is designed to be powerful and comprehensive.
Both support frequentist (p-value) and Bayesian (probability-to-be-best) analysis. Optimizely additionally offers Stats Engine (sequential testing) and multi-armed bandits. Testio focuses on the core Z-test plus Bayesian inference with automatic winner declaration once significance is reached, which is what most marketing experiments need.
There's no automatic import (Optimizely doesn't export test definitions to standard formats), but because Testio's visual editor is so fast, recreating an existing test usually takes 10–15 minutes. Historical data stays in Optimizely; new tests run in Testio.
The Enterprise plan ($299/mo) handles unlimited projects, unlimited events, and has SLA-backed support. Testio serves companies up to several hundred thousand monthly visitors without performance issues. Above that, or if you need Full Stack / server-side experimentation, Optimizely is the better choice.
Create an account, install the snippet, launch your first test. All in about 15 minutes.
Start free trial →