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.
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.