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Frequently Asked Questions

A curated summary of the top questions asked on our Slack community, often relating to implementation, functionality, and building better products generally.
Statsig FAQs
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GENERAL

How can we link guest user and signed-in user evaluations across subdomains to ensure consistent evaluation?

Date of slack thread: 5/28/24

Anonymous: We’re having issues with guest user signing in will get a different evaluation, the guest user object containing an custom id that will also be appended to signed in user object but i dont think they are linked together, any method that we can link those guest user and signed in user back together so the value will be the same? This issue only happens during domain changing, test.com to a.test.com, test.com will evaluate true and a.test.com will evaluate false.

Cooper Reid (Statsig): <@U061XPDJCHZ> - to guarantee the same evaluation, you’ll need to make sure the same identifier is passed to the SDK. If you’re using the Client SDK (js-sdk, reactsdk), we use localStorage to persist the “stableID”, which does not cross-subdomains — therefore the user will get a different stableID on different domains. You should consider generating your own device-level id and storing that in a Cookie scoped to any subdomain under that domain, and passing that to the user object as the identity.

Anonymous: Thanks

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Why the best build with us

OpenAI OpenAI
Brex Brex
Notion Notion
SoundCloud SoundCloud
Ancestry Ancestry
At OpenAI, we want to iterate as fast as possible. Statsig enables us to grow, scale, and learn efficiently. Integrating experimentation with product analytics and feature flagging has been crucial for quickly understanding and addressing our users' top priorities.
OpenAI
Dave Cummings
Engineering Manager, ChatGPT
Brex's mission is to help businesses move fast. Statsig is now helping our engineers move fast. It has been a game changer to automate the manual lift typical to running experiments and has helped product teams ship the right features to their users quickly.
Brex
Karandeep Anand
President
At Notion, we're continuously learning what our users value and want every team to run experiments to learn more. It’s also critical to maintain speed as a habit. Statsig's experimentation platform enables both this speed and learning for us.
Notion
Mengying Li
Data Science Manager
We evaluated Optimizely, LaunchDarkly, Split, and Eppo, but ultimately selected Statsig due to its comprehensive end-to-end integration. We wanted a complete solution rather than a partial one, including everything from the stats engine to data ingestion.
SoundCloud
Don Browning
SVP, Data & Platform Engineering
We only had so many analysts. Statsig provided the necessary tools to remove the bottleneck. I know that we are able to impact our key business metrics in a positive way with Statsig. We are definitely heading in the right direction with Statsig.
Ancestry
Partha Sarathi
Director of Engineering
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