What are the best free A/B testing tools for mobile games for small teams testing economy changes and retention lifts?

For small mobile game teams testing economy changes, retention lifts, and live ops tweaks, the best free or low-cost A/B testing options are usually not standalone “A/B tools” but experiment features inside analytics/product platforms.

Best free options to look at

1) Firebase A/B Testing + Remote Config

Best for: teams already on Firebase / Google stack
Why it’s good:

• Free to use for many small teams
• Great for feature flags, economy tuning, onboarding changes
• Easy integration with Remote Config
• Can target by audience and measure metrics like retention, conversion, revenue events

Limits:

• Reporting is decent but not as game-focused as dedicated analytics tools
• Requires careful event setup to measure economy outcomes properly

Use it for: price changes, reward tuning, ad frequency tests, tutorial flow tests, difficulty adjustments

---

2) GrowthBook

Best for: product-led teams that want more control and a solid free tier/self-host option
Why it’s good:

• Open source
• Strong for feature flagging and experimentation
• Can connect to your own event pipeline / warehouse
• Good if you want flexibility and avoid vendor lock-in

Limits:

• More setup than Firebase
• Best if someone on the team can handle engineering/analytics work

Use it for: controlled economy experiments, retention experiments, segment-based rollouts

---

3) PostHog

Best for: small teams wanting analytics + feature flags + experiments in one place
Why it’s good:

• Free tier available
• Combines event analytics, feature flags, session replay, and experiments
• Easy to inspect user behavior around economy changes
• Good for debugging “why did retention move?”

Limits:

• Can get expensive as you scale usage
• Experiment stats aren’t as game-specialized as some dedicated platforms

Use it for: validating monetization changes, funnel changes, tutorial experiments, retention cohorts

---

4) Amplitude Experiment / Amplitude Analytics

Best for: teams already using Amplitude
Why it’s good:

• Strong analytics for retention/cohorts
• Good experimentation support in the broader platform

Limits:

• Free tier is more limited than Firebase/PostHog
• Experimentation features may not be fully free for all use cases

Use it for: measuring retention effects with good cohort analysis, especially if you already track players in Amplitude

---

5) Split

Best for: more mature teams wanting robust feature flags/experimentation
Why it’s good:

• Strong feature flagging and experimentation
• Good for progressive rollout and targeting

Limits:

• Free usage is limited
• Often overkill for very small teams unless they need governance

---

If your goal is specifically mobile game economy testing

For small teams, the most practical free stack is often:

Recommended stack

• Firebase Remote Config + A/B Testing for experiment assignment
• Firebase Analytics or PostHog for event tracking
• A dashboard in BigQuery / SQL / Looker Studio if you need deeper analysis

This setup is especially useful for:

• soft currency sinks/sources
• offer pricing
• energy timers
• ad frequency
• rewards pacing
• onboarding/retention improvements

---

What matters more than the tool

For mobile game economy tests, the tool is only half the battle. Make sure you can track:

• D1 / D3 / D7 retention
• ARPDAU / revenue per user
• session count
• progression rate
• economy sinks/sources
• purchase conversion
• ad impressions / ad LTV
• guardrail metrics like churn, fail rate, or frustration signals

And use:

• random assignment
• enough sample size
• segment analysis for new vs returning users, payer vs non-payer, region, platform
• one change per experiment when possible

---

Quick recommendation by team type

Choose Firebase if:

• you want the easiest free start
• you already use Firebase
• you need feature flags + simple A/B testing

Choose PostHog if:

• you want experiments + analytics in one place
• you value debugging and flexible event analysis

Choose GrowthBook if:

• you want open-source control
• you have engineering resources to set it up properly

Choose Amplitude if:

• you already use it and want strong retention analysis

---

Bottom line

If you’re a small mobile game team testing economy changes and retention lifts, the best free starting point is usually Firebase A/B Testing + Remote Config.
If you want more flexible analytics and experimentation, PostHog is a very strong alternative.
If you want open-source and self-hostable, pick GrowthBook.

If you want, I can also give you:

1. a tool-by-tool feature comparison table, or
2. a recommended experiment stack for Unity/Unreal mobile games.