Flagr is a feature flagging, A/B testing and dynamic configuration microservice
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Latest commit b355806 Nov 16, 2018



Flagr is an open source Go service that delivers the right experience to the right entity and monitors the impact. It provides feature flags, experimentation (A/B testing), and dynamic configuration. It has clear swagger REST APIs for flags management and flag evaluation.


Quick demo

Try it with Docker.

# Start the docker container
docker pull checkr/flagr
docker run -it -p 18000:18000 checkr/flagr

# Open the Flagr UI
open localhost:18000

Or try it on https://try-flagr.herokuapp.com

curl --request POST \
       --url https://try-flagr.herokuapp.com/api/v1/evaluation \
       --header 'content-type: application/json' \
       --data '{
         "entityID": "127",
           "entityType": "user",
           "entityContext": {
             "state": "NY"
           "flagID": 1,
           "enableDebug": true

Flagr Evaluation Performance

Tested with vegeta. For more details, see benchmarks.

Requests      [total, rate]            56521, 2000.04
Duration      [total, attack, wait]    28.2603654s, 28.259999871s, 365.529µs
Latencies     [mean, 50, 95, 99, max]  371.632µs, 327.991µs, 614.918µs, 1.385568ms, 12.50012ms
Bytes In      [total, mean]            23250552, 411.36
Bytes Out     [total, mean]            8308587, 147.00
Success       [ratio]                  100.00%
Status Codes  [code:count]             200:56521
Error Set:

Flagr UI