[Cloven]

I don't think you understand Redis. Redis is also a key-value store, but implements a variety of structures, not just RTree, and has a large number of operations on those data structures (http://redis.io).

Spacebase appears to be a significantly more primitive KV store that implements RTree. Not that that's bad; looks interesting, even though it appears that the product won't be free, and so in my opinion is probably doomed.

Using 'Redis' in the title is just embarrassing for Spacebase and, by extension, for YC too. No need to troll the professional developer community with ridiculous comparisons.

[js4all]

I had the same impression. The author doesn't know Redis well or he wouldn't have made that comparison.

[pron]

The comparison is meant to be functional - not technical. Most people use Redis as a low-latency key-value store either for write-heavy uses, short-term storage or as a cache. SpaceBase is, indeed, not a key-value store, but it can now serve the same purpose Redis does, namely, a low-latency, write-heavy data-store, only for spatial indexing rather than key indexing. I think I've made an apt, fair analogy.