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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Author here: I'm loving all the suggestions of ways that this might be achievable in either a faster or simpler method! The code is open source at https://github.com/shaneosullivan/example-canvas-fill and I'd love to see you hackers improve on it and share it with everyone. Any and all improvements I'll happily use going forward in my app.
I can also recommend https://tuxpaint.org/. I see they also have an app for Android nowadays, but no iOS it seems.
NOTE:
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Hence, a higher number means a more popular project.