We do not provide tide information within our apps at this time.
The primary implementation of the algorithms required to do so are licensed under the GPL which would require open sourcing all of our code.
For countries outside of the US, in many cases the harmonic constants data required to generate a tide forecast are licensed on incompatible commercial terms.
Please see here for more background on this.
But other apps provide this…
True. However, we have outstanding concerns around staying on the right side of the licensing terms and commercial terms for this data. We also see limited value in providing coverage only for limited parts of the world (e.g. the US only, where the harmonic constant data is in the public domain).