Try an idea, prove it works, get people using it: that is what Syntica is built for today. Running apps at larger scale is the next thing we are building, so your app can keep growing in the same place.
✓Pay for what you run, not for how many people use it
✓Clear limits, so a busy month never surprises you on the invoice
✓Until then, an app that outgrows us moves as it is, nothing to rebuild