Safely roll out features to specific users or groups
Test changes with small groups of users before rolling out wider. Analyze usage with product analytics and session replay.
cut failure rates by 90%
"Feature flags are crucial for us. We use them as kill switches for all our features."
increased registrations by 30%
"Enables a ‘slow rollout’ strategy... while also analyzing feature adoption and performance in the same tool."
improved feature roll-out with flags
"The integrated insights and feature flags help us monitor how users with specific flags enabled are using features"
switched from an in-house tool
"Feature flags immediately bought a lot of value. What’s really elegant is how flags interlink with product analytics."
Features
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Release conditions
Customize your rollout strategy by user or group properties, cohort, or trafic percentage
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Multivariate feature flags
Simultaneously test multiple versions against a control group
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Test changes without touching your codebase
JSON payloads let you change text, visuals, or entire blocks of code without subsequent deployments
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Developer-friendly automation
Automated usage reports, IP address resolution (for location-based targeting), and recall user properties to avoid passing them manually every time
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Early access feature opt-in widget
Allow users to opt in to (or out of) specified features. Or use the API to build your own UI.
History & activity feed
See who hit a feature flag, the flag’s value, and which page they were onLocal evaluation
Improves speed by caching a flag’s value on initial loadInstant rollbacks
Disable a feature without touching your codebaseBootstrapping
Get flags and values to trigger changes immediately on page loadPersist flags across authentication steps
Make sure users have a consistent experience after loginFlag administration
See the history of a feature flag or control who can modify flags with user rolesSDKs or API
Copy code snippets for your library of choice, or implement yourself with the APIMulti-environment support
Test flags in local development or staging by using the same flag key across PostHog projects
Answer all of these questions (and more) with PostHog Feature flags.
- How do I test features internally?
- How do I set up an allow or deny list?
- How do I do a canary release?
- How do I sample events for a high-volume API?
- How do I set up a beta?
- How do I test bug fixes?
Usage-based pricing
Use feature flags free. Or enter a credit card for advanced features.
Either way, your first 1,000,000 requests are free – every month.
Free
No credit card required
Unlimited
All features, no limitations
Requests
1,000,000/mo
Unlimited
Features
Boolean feature flags
Multivariate feature flags & experiments
Persist flags across authentication
Test changes without code
Multiple release conditions
Release condition overrides
Flag targeting by groups
Local evaluation & bootstrapping
Flag usage stats
A/B testing
Group experiments
Funnel & trend experiments
Secondary experiment metrics
Statistical analysis
Data retention
1 year
7 years
Monthly pricing
First 1 million requests
Free
Free
1-2 million
-
$0.000100
2-10 million
-
$0.000045
10-50 million
-
$0.000025
50 million+
-
$0.000010
FAQs
PostHog vs...
So, what's best for you?
Reasons a competitor might be better for you (for now...)
- Triggers and workflows to enable/disable flags on other events
- Data exports
Reasons to choose
- Integration with other analysis products
- View replays attached to a flag, analyze data based on a flag, etc.
- JSON payloads
- Flags can return JSON and trigger other in-app changes (like displaying a banner)
- Targeting options
- Early access management suite for toggling betas or new features
Have questions about PostHog?
Ask the community or book a demo.
Featured tutorials
Visit the tutorials section for more.
How to do a canary release with feature flags in PostHog
A canary release or canary deployment is the process of rolling out a new feature to a subset of users before releasing it to a larger group. Once satisfied with tests and analysis, the feature rolls out to a larger group (or everyone).
How to evaluate and update feature flags with the PostHog API
Learn how to use the
decideendpoint to evaluate your feature flags (both boolean and multivariate), get data about them, and update them.How to bootstrap feature flags in React and Express
Bootstrapping feature flags make them available as soon as React and PostHog load on the client side. This enables use cases like routing to different pages on load, all feature flagged content being available on first load, and visual consistency.
How to set up Angular feature flags
Learn you how to set up the tools PostHog provides by creating a basic Angular app, adding PostHog, and then using it to capture events and manage feature flags.
Install & customize
Here are some ways you can fine tune how you implement feature flags.
Explore the docs
Get a more technical overview of how everything works in our docs.
Meet the team
PostHog works in small teams. The Feature Success team is responsible for building feature flags.
(Shockingly, this team prefers their pizza without pineapple.)
Roadmap & changelog
Here’s what the team is up to.
Latest update
Feb 2024
Graphs and significance calculation added for secondary metrics
You've been able to add secondary metrics to A/B experiments in PostHog for a while, but we've now added much better reporting around them.
The new graphs and significance calculations will help you determine if there are knock-on effects to your experiments away from the primary metric.
For example, you may test a change to your sign-up flow to improve conversion as a primary metric, but you may also need to know about impact to activation as a secondary metric. Now you can understand both easily!
Up next
Feature Success Analysis
Bringing together different parts of PostHog (flags, replay, surveys) to allow users to better analyse the success of a new feature.
Progress
Users & recordings linked to feature flags
We want to make it easier for those who use feature flags to get information on users attached to a particular feature flag, and gather more information on those users' experience through session recordings.
Progress
Questions?
See more questions (or ask your own!) in our community forums.
- Question / TopicRepliesCreated
Pairs with...
PostHog products are natively designed to be interoperable using Product OS.
This is the call to action.
If nothing else has sold you on PostHog, hopefully these classic marketing tactics will.
PostHog Cloud
Digital download*
Notendorsed
by Kim K
*PostHog is a web product and cannot be installed by CD.
We did once send some customers a floppy disk but it was a Rickroll.