LaunchDarkly vs Statsig vs PostHog (2026): What Feature Flags Cost Once You Have Real Users
By Jascha Kaykas-Wolff, CEO of Visiting Media, former CMO of Mozilla and BitTorrent
Last updated November 4, 2026 · 8 min read
Choose Statsig if you want feature flags and A/B tests from one vendor: flag checks are unlimited and free on every plan, and Pro is $150 a month when you need approvals. Choose PostHog if your product analytics already runs there, because 1 million flag requests a month are free and the flags share its user data. Choose LaunchDarkly when automated rollback, enterprise approval workflows or a familiar name in the security review matter more than price, since it bills $10 per extra service connection and about $8.33 per 1,000 client-side users.
It’s 4:50 on a Friday. The new checkout went out at 4:30, card declines have tripled, and the only off switch is an environment variable called NEW_CHECKOUT that needs a full redeploy to flip. The build takes 11 minutes. Someone is already typing in the incident channel.
That is the afternoon that gets a feature flag tool bought. Which tool depends less on features than on how each vendor meters you, because all three can turn a code path off without a redeploy. LaunchDarkly bills for every server and browser that connects to it, which is fine for an internal tool with 2,000 users and painful for a consumer app with 2 million. Statsig gives flag checks away and meters analytics events instead. PostHog counts requests (the first million each month are free).
Prices come from the LaunchDarkly, Statsig, PostHog and Flagsmith pricing pages, checked November 4, 2026. The monthly totals are our arithmetic for two scenarios, stated under the cost table. SaaS Versus does not sell a feature flag product, and the site footer notes that some links may be affiliate links.
LaunchDarkly vs Statsig vs PostHog at a glance
| Feature | LaunchDarkly | Statsig | PostHog |
|---|---|---|---|
| Free plan | Developer: unlimited flags and seats, 5 service connections, 1K client-side MAU, 1 project, 3 environments | Developer: unlimited flag checks and seats, 2M metered events, 50K session replays a month | 1M flag requests a month free, no seat fees |
| First paid plan | Foundation: pay as you go, billed yearly, no seat fees | Pro: $150/month with 5M events | Pay as you go from the 1,000,001st request |
| What you are billed on | $10 per service connection past 5, plus about $8.33 per 1K client-side MAU | Metered events (exposures, logs, metrics); $0.05 per 1K past 5M on Pro | /flags requests: $0.0001 each from 1M to 2M, falling to $0.00001 past 50M |
| Approvals on flag changes | Enterprise only | Pro ($150/month) | Not part of the per-request flag price; check PostHog's plan page |
| Experimentation | 100K experimentation MAU free on Developer | Core product; advanced stats on Pro | Bundled with flags, shares the same request meter |
| Best for | Large engineering orgs with release governance and many SDKs | Product teams that want flags and A/B tests in one place | Teams already using PostHog for analytics and replay |
| Biggest drawback | Client-side MAU pricing climbs fast on consumer traffic | OpenAI owns it now, so the roadmap answers to someone else | Server-side polling can multiply requests 10x if you misconfigure it |
What feature flags cost at 20K and 100K monthly users
| Scenario | LaunchDarkly Foundation | Statsig | PostHog | Flagsmith (hosted) |
|---|---|---|---|---|
| Small B2B app: 20K client-side MAU, 12 service connections, about 600K flag requests | About $237/month | $0 (Developer) | $0 | $40/month (Start-Up, yearly) |
| Growing app: 100K client-side MAU, 40 service connections, about 3M flag requests | About $1,183/month | $0 for flags; $150/month once experiments pass 2M events | $145/month | $250/month (Scale-Up, yearly) |
Assumptions: a service connection is one server-side SDK instance connected to one environment, so 6 backend services running in production and staging count as 12. LaunchDarkly totals take the first 5 connections as included, charge $10 for each one after that, and use the $8.33 per 1,000 MAU rate from the Foundation plan card. The comparison table on the same page says $10 per 1,000, which would push the small scenario to $270 and the large one to $1,350. For PostHog we assume client-side flag fetches of about 30 per user a month and server-side local evaluation that rarely changes, so 304 polls stay free. Statsig assumes flags only in the small case. Flagsmith team-member limits (3 on Start-Up, 5 on Scale-Up) aren’t priced in.
The PostHog math has one trap. Local evaluation on a server polls for flag definitions, and every poll that returns changed definitions is billed as 10 requests. A team that edits flags all day from a dozen backend pods can burn through the free million without a single user logging in.
LaunchDarkly: you pay for governance
LaunchDarkly has been doing this since 2014 and it shows in the corners: 30 SDKs, release pipelines, and Guardian, a paid add-on that watches error and latency metrics during a rollout and pauses or rolls back on its own. That last one is the thing a Friday-afternoon team actually wants. The Foundation plan dropped seat fees, which used to be the line that made finance flinch.
The meter moved to client-side users instead. A B2B app with 20,000 monthly users is fine. A consumer app with 500,000 is not, at roughly $4,165 a month in MAU charges alone on the plan-card rate. And the controls a regulated company buys LaunchDarkly for (approval workflows, custom roles, SCIM) sit in Enterprise, which has no public price.
Statsig: flags for free, experiments for money
Statsig’s pricing page says “unlimited” next to flag checks on every plan, and it means it. You pay for events: experiment exposures, logged events, ingested metrics. A team that only gates features and never runs a test can stay on the free Developer plan for a long time. Pro at $150 a month is the cheapest way on this page to get change reviews and approvals on flag edits, a control LaunchDarkly holds for Enterprise.
The stake is ownership. OpenAI announced on September 2, 2025 that it would buy Statsig for about $1.1 billion in stock and made founder Vijaye Raji its CTO of Applications. Statsig still sells all three plans. Still, your release controls now depend on a company whose main business is ChatGPT, and if your legal team worries about where usage data ends up, that conversation is going to happen.
We would buy it anyway, for most teams under 100 engineers.
PostHog: flags that know your users already
PostHog’s argument is that the flag and the analytics share one person record. Target a flag at users who hit the paywall twice last week, then watch the funnel for that cohort in the same tool, without piping data between vendors. If PostHog is already your product analytics (we compared it with Mixpanel and Amplitude here), adding flags costs nothing up to a million requests.
Past that, the per-request pricing is cheap but it’s hard to forecast. Requests come from SDK initialization, from identify calls, from survey targeting and from server polls, and the number doesn’t map neatly onto users. Budget from a month of real traffic.
Flagsmith, if you need it on your own servers
Flagsmith is open source and the plainest priced of the four: $40 a month on yearly billing for 1 million requests, $250 for 5 million. Self-hosted and private-cloud deployments are an Enterprise conversation. Teams in healthcare or government who can’t send user identifiers to a third party should start here or with self-hosted PostHog.
Where each option fits (and where it does not)
| Option | Fits | Does not fit |
|---|---|---|
| LaunchDarkly | Engineering orgs with dozens of services, compliance-driven release approval, and a budget for Guardian automated rollback | Consumer apps with large client-side audiences, and startups that can’t justify an Enterprise contract to get approvals |
| Statsig | Product teams running regular A/B tests, and anyone who wants approvals on flag changes for $150 a month | Companies whose procurement or legal teams won’t accept an OpenAI-owned vendor in the release path |
| PostHog | Teams already on PostHog analytics or session replay who want flags targeted by behavior | Teams that need a predictable fixed monthly bill, or that run heavy server-side polling without tuning it |
| Flagsmith | Open-source preference, self-hosting requirements, and small teams that want a flat price | Teams that want built-in experimentation statistics and product analytics next to their flags |
LaunchDarkly: Strengths and Weaknesses
✓Pros
- ✓No seat fees on Developer or Foundation
- ✓Guardian add-on pauses or rolls back a bad release automatically
- ✓30 SDKs and unlimited projects and environments on Foundation
✗Cons
- ✗Client-side MAU billing gets expensive on high-traffic apps
- ✗Approvals, custom roles and SCIM require Enterprise
- ✗Its own pricing page lists two different MAU rates
Statsig: Strengths and Weaknesses
✓Pros
- ✓Unlimited flag checks on every plan, including free
- ✓Change reviews and approvals on Pro at $150 a month
- ✓Experimentation, product analytics and 50K session replays on the free plan
✗Cons
- ✗OpenAI ownership since the September 2025 deal
- ✗Warehouse-native deployment and SSO are Enterprise only
PostHog: Strengths and Weaknesses
✓Pros
- ✓1 million flag requests free every month, no seat fees
- ✓Flags target the same users and cohorts as PostHog analytics
- ✓Open source, with a self-hosting option
✗Cons
- ✗Request counts are hard to forecast before you have traffic
- ✗Changed local-evaluation polls bill as 10 requests each
The Verdict
For most SaaS teams buying their first feature flag tool, start on Statsig. Flag checks cost nothing on any plan, the free tier includes real experimentation, and $150 a month buys the approval workflow LaunchDarkly keeps behind an Enterprise contract. If you already run PostHog for analytics, use its flags instead and skip a vendor. Pay for LaunchDarkly when you have enough services and enough release risk that Guardian’s automatic rollback and its governance features are worth roughly $1,200 a month at 100,000 users, and while your client-side audience stays in the tens of thousands. If the OpenAI ownership of Statsig is a dealbreaker for your legal team, PostHog is the next pick, and Flagsmith if it has to run on your servers.
Frequently Asked Questions
How much does LaunchDarkly cost in 2026?
LaunchDarkly's 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 pay as you go on annual billing with no seat fees: 5 service connections are included, each additional one is $10 a month, and client-side MAU is listed at $8.33 per 1,000 a month on the plan card ($10 in the comparison table on the same page). Approvals, custom roles and SCIM are Enterprise features with custom pricing.
Are Statsig feature flags really free?
Statsig lists unlimited flag and config checks on every plan, including the free Developer plan. Billing is based on metered events such as experiment exposures, logged events and ingested metrics. Developer includes 2 million events a month. Pro costs $150 a month with 5 million events and $0.05 per 1,000 after that, and adds change reviews, approvals and unlimited analytics retention.
How does PostHog charge for feature flags?
PostHog bills feature flags by requests to its /flags endpoint. The first 1 million requests each month are free. After that the price is $0.0001 per request from 1 to 2 million, $0.000045 from 2 to 10 million, $0.000025 from 10 to 50 million and $0.00001 above 50 million. Server-side local evaluation polls are charged as 10 requests when flag definitions have changed, and polls that return 304 Not Modified are free. There are no seat fees.
Who owns Statsig now?
OpenAI announced on September 2, 2025 that it would acquire Statsig in an all-stock deal valued at about $1.1 billion, with founder Vijaye Raji named OpenAI's CTO of Applications. Statsig still sells its plans publicly and lists the same free, Pro and Enterprise tiers on its pricing page.
Is there an open-source alternative to LaunchDarkly?
Flagsmith is open source and sells hosted plans: Free covers 50,000 requests a month for 1 team member, Start-Up is $40 a month billed yearly for 1 million requests and 3 team members, and Scale-Up is $250 a month billed yearly for 5 million requests and 5 team members. Self-hosted and private-cloud deployments are listed under Enterprise. PostHog is also open source and can be self-hosted.
Should a startup pay for LaunchDarkly?
Usually not yet. A startup with a few backend services and under 20,000 monthly users pays nothing for flags on Statsig or PostHog, and about $237 a month on LaunchDarkly Foundation in our scenario. LaunchDarkly starts to earn its price when you need automated rollback on bad releases (its Guardian add-on), enterprise approval workflows, or a vendor your security review already knows.
Related Comparisons
Browse every head-to-head in all SaaS comparisons, or start with these:
- PostHog vs Mixpanel vs Amplitude: the analytics your flags will be measured against
- Sentry vs Rollbar vs Bugsnag: the error spike that tells you to flip the flag
- PagerDuty vs Opsgenie vs incident.io: who gets paged when nobody flipped it
- Vercel vs Netlify vs Cloudflare Pages: where that 11-minute rebuild runs
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