Statsig is the best pick for most mobile app teams because its free Developer plan includes 2 million metered events a month, unlimited flag checks, and full experimentation, with Pro at $150 a month when volume grows. Firebase A/B Testing is the best no-cost start for apps already built on Google services, since A/B Testing itself is listed as no-cost and Remote Config gives 100,000 fetch requests a day at no cost. LaunchDarkly and Harness FME suit teams that need feature flags plus experiments in production, while Optimizely and VWO use quote-only pricing and suit larger programs with a sales-led budget.
Mobile app experiments differ from web tests because a change often ships inside an app release, a flag controls who sees it, and the result must be read against app events. The tools below all support mobile apps through SDKs, feature flags, or Remote Config. Pick by how many users you test, how many experiments you run at once, and how much event volume your app sends.
On this page
Top online experiment software for mobile apps: comparison table
Swipe the table sideways on a phone to see every column.
| # | Name | Best for | Starting price | Free plan / trial | Link |
|---|---|---|---|---|---|
| 1 | Statsig | Most mobile app teams starting experiments | $150 per month | Yes | Visit |
| 2 | Firebase A/B Testing | Google-based apps on a zero budget | $0 per month | Yes | Visit |
| 3 | LaunchDarkly | Feature flags plus experiments at scale | $10 per service connection/month | Yes | Visit |
| 4 | Amplitude Experiment | Product analytics teams that also test | $0 per month | Yes | Visit |
| 5 | PostHog | Small teams that want analytics and tests in one place | $0 per month | Yes | Visit |
| 6 | Optimizely Feature Experimentation | Large teams with a dedicated experimentation program | quote only | No | Visit |
| 7 | VWO | Marketing-led teams testing app and web journeys | quote only | Free trial (30 days) | Visit |
| 8 | Harness FME | Engineering teams inside a Harness delivery setup | quote only | Yes | Visit |
The 8 best top online experiment software for mobile apps, in detail
Statsig
Best for: Most mobile app teams starting experiments
Statsig combines feature flags, experimentation, and analytics in one platform. The Developer plan is free and includes gates, configs, experimentation, and analytics, with 2 million metered events each calendar month at no charge and unlimited flag and config checks. Pro costs $150 a month, includes 5 million metered events, and adds advanced experimentation, unlimited analytics retention, and change reviews and approvals.
- The trade-off is the meter.
- Statsig bills metered events such as experiment exposures, logged events, and ingested metrics.
- A team with a chatty app can pass 2 million events fast, and then the prompt to upgrade appears.
- Choose Statsig if you want a real free start and a clear $150 step up.
Pros
- Free Developer plan includes 2 million metered events a month
- flag checks are unlimited on every plan
- Pro adds change reviews and approvals
Cons
- Pro covers one project only, so a second project needs its own upgrade
- event volume above 5 million a month adds $0.05 per 1,000 events
Firebase A/B Testing
Best for: Google-based apps on a zero budget
Firebase A/B Testing is the natural first test tool for an app that already uses Firebase, because the test, the remote values, and the analytics live in one project. The Firebase pricing page lists A/B Testing as no-cost, and the Spark plan needs no payment information to start. Remote Config, which delivers the variant values to the app, gives 100,000 fetch requests a day at no cost on both Spark and Blaze, and then Blaze charges $0.000006 per request up to 10 million a day.
- The limit to plan around is the Remote Config change.
- Since September 1, 2026, fetch requests above the daily free allowance are billed on Blaze, so an app with millions of daily users can create a Remote
- Choose Firebase if your app is already on Firebase and you want tests without a new vendor.
- Skip it if you need a dedicated statistics engine or feature flag governance beyond what Firebase provides.
Pros
- A/B Testing is listed as no-cost on the Firebase pricing page
- works with Remote Config, Analytics, and Cloud Messaging in the same project
- Spark plan needs no payment method
Cons
- Remote Config fetches above 100,000 a day are billed on Blaze
- advanced analysis depends on Google Analytics and other Firebase services
LaunchDarkly
Best for: Feature flags plus experiments at scale
LaunchDarkly treats flags as the delivery method and experiments as the measurement method, which fits mobile apps that release behind flags and then test the new version against the old one. The Developer plan is free, with unlimited seats and flags, 5 service connections, 1,000 client-side monthly active users, 1 project, and 3 environments. Foundation is usage based, at $10 per service connection a month and about $8.33 per 1,000 client-side monthly active users a month when billed yearly.
- The trade-off is that the bill follows your user count, not your team size.
- A consumer app with 100,000 client-side monthly active users and 40 service connections can reach about $1,183 a month on Foundation before any experi
- Choose LaunchDarkly if you need guarded rollouts and approvals alongside tests.
- Skip it if your app has very large monthly active user numbers and a simpler flag tool would do.
Pros
- Developer plan is free with unlimited flags and seats
- Foundation has no seat fees
- experimentation is included with a mature statistics engine
Cons
- Foundation bills per service connection and per 1,000 client-side monthly active users, so a large consumer app can grow costly
- experimentation is a separate add-on on some plans
Amplitude Experiment
Best for: Product analytics teams that also test
Amplitude Experiment sits inside Amplitude product analytics, so a test result can be read next to the funnel and cohort views that explain why users behaved that way. The Free plan costs $0, includes 2 million events a month, and allows 1 active experiment. Plus starts at $0, keeps the first 2 million events free each month, and scales with event volume up to 70 million events.
- The limit that changes the choice is the single active experiment.
- A team that wants to test onboarding, pricing, and a new home screen at the same time cannot do that on Free or Plus, and must move to Growth, which i
- Choose Amplitude if you already use Amplitude analytics and you test one idea at a time.
- Skip it if you run several experiments in parallel.
Pros
- Free plan includes 2 million events a month and 1 active experiment
- tests run on the same data as funnels and cohorts
- Plus starts at $0 and scales with event volume
Cons
- Free and Plus allow only 1 active experiment each, so concurrent tests need Growth
- Growth and Enterprise are quoted, with no published dollar figure
PostHog
Best for: Small teams that want analytics and tests in one place
PostHog bundles product analytics, session replay, feature flags, and experiments, and it bills experiments through feature flag requests. The pricing page gives 1 million flag requests free each month, then $0.0001 per request from 1 million to 2 million. Product analytics gives 1 million events free each month, and session replay gives 5,000 recordings free each month, so a small app can run the whole stack at $0.
- The trade-off is the hard stop on the free plan.
- When usage passes the monthly allowance, PostHog stops collecting rather than charging, which protects the budget but leaves a gap in the data during
- Adding a card moves the account to usage billing with the same allowances.
- Choose PostHog if you want one tool for analytics, replay, flags, and tests.
Pros
- 1 million flag requests a month are free, with experiments billed through the same flag meter
- product analytics, session replay, and surveys sit in the same platform
- no seat fees
Cons
- The free plan stops collecting when the monthly allowance is passed, so data is dropped rather than billed
- platform packages at $250, $750, or $2,000 a month sit on top of usage
Optimizely Feature Experimentation
Best for: Large teams with a dedicated experimentation program
Optimizely Feature Experimentation is built for teams that test features inside the app code, using SDKs to decide which users see a variation and then measuring the result with Stats Engine. The Optimizely pricing page says every plan is individually packaged and asks buyers to share their goals so the team can build a custom quote. That means there is no published starting price, and the cost depends on monthly active users, the products selected, and the contract scope.
- The trade-off is access.
- A large team gets a mature statistics engine, multi-armed bandits, and audience targeting, but a small team cannot try the platform without going thro
- Choose Optimizely if your program runs many experiments and has a budget for an annual contract.
- Skip it if you need a published price before the first call.
Pros
- Feature Experimentation supports server-side and feature tests with Stats Engine
- Web Experimentation covers visual tests on the same platform
- warehouse-native analytics link tests to business data
Cons
- No published price, so every deal needs a custom quote
- no free plan, so a small team cannot start without a sales conversation
VWO
Best for: Marketing-led teams testing app and web journeys
VWO, now sold with AB Tasty under the Wingify brand, covers A/B testing, multivariate testing, and server-side tests through FullStack, plus heatmaps, session recordings, and surveys through Insights. The Wingify pricing page states that there are no fixed plans and that each proposal is built around the buyer goals, with pricing based on monthly active users. A 30-day free trial is offered with no card.
- The trade-off is that the entry cost is unknown until the proposal arrives.
- Earlier published VWO Testing figures near $314 a month for 10,000 tracked users no longer match the current quote-only page, so do not budget from ol
- Choose VWO if you want testing, behavior analytics, and personalization from one vendor.
- Skip it if you need a fixed monthly price you can approve without a demo.
Pros
- Testing, Insights, Personalize, and FullStack sit under one Wingify account
- 30-day free trial with no card
- unlimited experiments on the higher plans
Cons
- No published price on the current Wingify pricing page, so every plan needs a custom proposal
- pricing is based on monthly active users, so traffic growth raises the quote
Harness FME
Best for: Engineering teams inside a Harness delivery setup
Harness Feature Management and Experimentation, known as Harness FME, is the former Split platform, acquired by Harness in 2024 and now sold as a module inside the Harness platform. Split built its name on experimentation, with flags that connect directly to metrics services so a team can see whether a feature change moved a business metric. That makes FME a strong fit for mobile teams that already release through Harness pipelines.
- The trade-off is the buying path.
- Standalone Split pricing no longer exists, and Harness FME pricing is quoted per customer as part of a broader Harness decision, with no published pri
- Choose Harness FME if your team already uses Harness for delivery and wants experimentation tied to releases.
- Skip it if you want a standalone experiment tool with a published price.
Pros
- Formerly Split, with experimentation built around feature flags from the start
- metrics integrations link flags to business results
- Free Edition is available for small use
Cons
- No published FME price, so the cost is quoted as part of a Harness platform decision
- the platform is broad, so a team that only needs tests may carry more tool than it uses
How we chose
We included only tools with a real mobile path, either through mobile SDKs, feature flags, or Remote Config, and with an official pricing page opened on 2026-11-12. Prices and plan limits come from those official vendor pricing pages, and we wrote quote only where the vendor publishes no price. We did not test any tool hands-on, and we did not install any app or SDK. The unique angle here is the billing unit: the cheapest tool on paper can become the dearest once your app event volume, user count, or flag requests pass the free allowance, so check the meter that matches your app, not just the headline price.
Which tool fits your app size and budget
| App stage | Best pick | Starting price | Key limit to watch |
|---|---|---|---|
| Solo app, under 2 million events a month | Statsig Developer or Firebase | $0 | Statsig metered events; Firebase Remote Config fetches above 100,000 a day |
| Small team, one test at a time | Amplitude Free or PostHog | $0 | Amplitude allows 1 active experiment; PostHog stops collecting past the free allowance |
| Growing app, flags plus tests | LaunchDarkly Foundation | $10 per service connection/month | Client-side monthly active users at about $8.33 per 1,000 |
| Large program, sales-led budget | Optimizely, VWO, or Harness FME | quote only | No published price, so get the quote in writing before you plan the year |
Frequently asked questions
What is the best online experiment software for mobile apps?
Statsig is the best pick for most mobile app teams because its free Developer plan includes 2 million metered events a month, unlimited flag checks, and full experimentation, and Pro costs $150 a month. Firebase is the best no-cost start for apps already on Google services, since A/B Testing is listed as no-cost.
How much does experiment software for mobile apps cost?
Costs range from $0 to quote only. Firebase, Amplitude Free, and PostHog start at $0 within their free allowances, Statsig Pro costs $150 a month, LaunchDarkly Foundation starts at $10 per service connection a month plus a user meter, and Optimizely, VWO, and Harness FME publish no price and need a custom quote.
Which experiment tool has the best free plan for a small app?
Statsig has the most useful free plan for a small app that tests often, with 2 million metered events a month and unlimited flag checks. Firebase is close for Google-based apps, with A/B Testing at no cost and 100,000 Remote Config fetches a day free. PostHog is also strong, with 1 million flag requests free each month.
Can I run A/B tests in a mobile app without a feature flag tool?
Yes, through Firebase A/B Testing with Remote Config, which delivers variant values to the app without a separate flag vendor. That path works well for simple tests, but it lacks the flag governance and approval workflows that LaunchDarkly, Statsig, and Harness FME provide for larger teams.
Which tool is best for testing inside a release pipeline?
Harness FME is the best fit when releases already run through Harness, because flags, rollouts, and experiments sit in the same delivery workflow for mobile apps. LaunchDarkly is the best standalone choice for the same job, with release pipelines and guarded rollouts.
Why do some experiment tools hide their prices?
Optimizely, VWO, and Harness FME price on monthly active users, event volume, contract length, and the modules selected, so a single list price would not cover every buyer. That is why they use a custom quote, and why you should ask for the billing unit and the overage rate in writing before you sign.
Sources
- https://www.statsig.com
- https://www.statsig.com/pricing
- https://firebase.google.com
- https://firebase.google.com/pricing
- https://launchdarkly.com
- https://launchdarkly.com/pricing
- https://amplitude.com
- https://amplitude.com/pricing
- https://posthog.com
- https://posthog.com/pricing
- https://www.optimizely.com
- https://www.optimizely.com/pricing
- https://vwo.com
- https://vwo.com/pricing
- https://www.harness.io
- https://www.harness.io/pricing
Prices and features were read on each company’s own website in November 2026. They change often, so confirm the current offer on the official site before you sign up or buy.