We want to make it as easy as possible for you to develop your app. Joining our API programme is free and there's a free tier, so you can develop and test without worrying about cost. Our free tier is generous enough to cover your development needs. 

Once you've gone into production and volumes increase, pricing is 'On Demand' and you only ever pay for what you use. 

We want to take the hassle out of developing apps and share what we've learned building our Trainsmart platform. The SDK is free and published on all the major package managers. 

If enough people show interest, we'll accelerate development and push out the SDK asap.