Skip to content
Go to file

Latest commit


Git stats


Failed to load latest commit information.
Latest commit message
Commit time

View performance data on Skylight View performance data on Skylight View performance data on Skylight License

A speedrun data store, analysis engine, and racing platform.

About is how speedrunners improve through data. It gives split-by-split analysis of individual runs, viewed through a lens of all runs. On, speedrunners share more than their time—they share their entire history of attempts, successful or not, and get feedback on how to improve long-term through statistics and comparisons with themselves and other runners in their weight class, both live (via races) and after-the-fact using historical data. works with LiveSplit and more than 15 other speedrunning timers. An auto-generated list can be viewed in the FAQ; new timers can self-integrate using the Exchange Format.


A Python client library for the API written by jeremander exists at jeremander/splitsio.

For full API documentation and when using other languages, see the API readme.

Local Development runs on Docker, which makes it easy and consistent to set up and run on any machine despite any unusual dependencies. The one downside is that you must first install Docker!


First Run

The first time you run with Docker is the best, because you'll have time to get a coffee! Yum! After the first run, it will be much quicker.


While you wait, you can also take a look at our short Codeflow tutorial to get up to speed with a few key pieces of the code.

Once the output looks settled (you should see * Listening on tcp://, you're good to go! Access localhost:3000 in your browser. The first page load after a new build may also take a minute.

Now that is running, one last step you should perform in another terminal window is

make seed

This will make sure your local JavaScript can talk to your local backend, as well as create some initial games in the database.

Further Setup

Some features are built on top of links with other platforms, like Twitch sign-in. If you want these features to work, you need to register developer applications with the appropriate services. See .envrc.example for details on which features require which platforms.

After changing or creating .envrc, run

source .envrc && make build run

to rebuild the server with your new environment variables, or use direnv to automate this step!


Getting Up and Running

If you're having trouble getting running at all using the above instructions, please make a GitHub issue so we can work it out! Even if you think it's a silly issue, the fact that it's happening to you means we haven't ironed out everything (even if the only thing preventing you from setting up is better documentation!).

Working with the Code

If you have the app up and running but are looking for insight into debugging your own changes, you can access a Rails console inside the Docker container with

make console

Attaching to a debugger

If you use binding.pry anywhere in the code, once you hit the breakpoint specified use the command

make attach

in another terminal window to attach to it. To detach, make sure to exit the debug session then use the docker attach escape sequence ctrl + p then ctrl + q.

If you need to attach to a container other than web, specify a container with the syntax

make attach container=worker

Running Tests

To run tests from inside the Docker container, use

make test

To run only specific tests, use

make test path=spec/path/to/test/file/or/dir


We use Rubocop for code cleanliness and styling. To run it against changed files, commit your changes and run

make lint

Profiling utilizes a few libraries for profiling our code.

Rack Mini Profiler is used to find major slowdowns in the code through the use of the badge in the top left corner of the browser window. There is also a slew of different URL parameters that you can use to get more detailed information about various aspects of the request. Details of these are explained in the readme for RMP. To get more detailed information about how code will perform in a production like environment, run

make profile

to boot the app in the profiling environment, which has most of the production flags toggled on.

DerailedBenchmarks is used to test memory over lots of requests. The commands that can be run are detailed in the readme for DB. When you have a command you want to run, use the make task like so with the options that you need

make derailed env="-e TEST_COUNT=5000 -e USE_AUTH=true" command="exec perf:mem_over_time"

The env flag is optional, so feel free to leave that blank if you have no environment variables to set.

Updating Gems or Docker

If you change the Dockerfile or Gemfile, you'll need to run

make build

to rebuild the Docker image for your changes to apply.

Cleaning Up

If you want to reset from scratch, you can run

make clean

which will run docker-compose down, remove the bundler volume, and remove node_modules/.

Things You Probably Don't Need to Know

Infrastructure is built in Ruby on Rails, but has some help from other pieces of infrastructure.


| AWS Auto Scaling Group (usually at 1)                                           |
+---------------------------------------------------------------------------------+   +----------------+
| AWS Target Group                                                                |   | AWS RDS        |
| +--------------------------------------+ +------------------------------------+ |   | +------------+ |
| | AWS EC2 Instance                     | | AWS EC2 Instance                   | |-->| | PostgreSQL | |
| | +----------------------------------+ | | +--------------------------------+ | |   | +------------+ |
| | | Docker                           | | | | Docker                         | | |   +----------------+
| | | +------------------+ +-------+   | | | | +------------------+ +-------+ | | |
| | | | Rails (& worker) | | Redis |   | | | | | Rails (& worker) | | Redis | | | |-------------------------\
| | | +------------------+ +-------+   | | | | +------------------+ +-------+ | | |                         |
| | | | livesplit-core   |             | | | | | livesplit-core   |           | | |                         |
| | | +------------------+             | | | | +------------------+           | | |                         |
| | +----------------------------------+ | | +--------------------------------+ | |                         |
| +--------------------------------------+ +------------------------------------+ |       New file trigger  V
+---------------------------------------------------------------------------------+   +------------+ | +--------+
| AWS Application Load Balancer                                                   |<--| AWS Lambda |<--| AWS S3 |
+---------------------------------------------------------------------------------+ | +------------+   +--------+
                                       ^  |                      Lambda tells Rails to parse               ^
                                 HTTPS |  | WebSockets                                                     |
                                       |  V                                                                |
                                     +------+                                                              |
                                     | User |--------------------------------------------------------------/
                                     +------+        Upload run using presigned S3 POST from Rails

Rails will synchronously parse any unparsed run before rendering it, but the asynchronous Lambda job is the preferred way for runs to be parsed because it still catches unvisited runs (e.g. in the case of a multi-file upload via drag-and-drop).

In development PostgreSQL and S3 are also Docker containers (see docker-compose.yml). Lambda is not yet implemented in development mode.


Favicons are generated by Favicon Generator and its Rails gem. To generate favicons from the source image (public/logo-imageonly.svg), run

docker-compose run web rails generate favicon

Config for this generation is at config/favicon.json.

Theme runs vanilla Bootstrap 4. Historically we used one of a few themes to give it some additional distinction and a professionally tailored dark mode, but we decided to switch to vanilla with out own dark mode after several bad experiences with those themes slowly falling more and more out of date from mainline Bootstrap.

Responsible Disclosure

If you find a security vulnerability in, please email it privately to, as posting the vulnerability in public may allow malicious people to use it before it can be fixed. We take security matters very seriously and respond quickly to disclosures.

Library Information

LiveSplit Core uses livesplit-core for parsing runs. The parser is located in lib/parser/*. To upgrade it, run

make update_lsc

and commit the changes.


To generate run history charts uses Highcharts, which requires a written license. Licensing is based on the honor system, so you do not need to enter a key anywhere. Highcharts is free to use for testing purposes.

You can’t perform that action at this time.