Great tool! Thank you :) I'm not personally vegetarian, but I found myself looking for one recently when I was in London and found it far too difficult. Minor suggestion: I'd make the "Vegan" label say "Vegan Only" (or "Only Vegan" I guess).
Also, what qualifies as a "chain"? I notice you have The Gate on there, but they have two locations, and you only have the one at Islington (and not the one at Hammersmith).
Thanks for your kind words! Chains are totally a judgement call; it's basically me deciding what 'feels indie'. I've not been to the one in Hammersmith yet; I'll add it when I visit.
Ah, I hadn't realised this was a personally-curated list (I see it now on the 'About' section). Since these are all places you've had personal experience with, why not add a sentence or two describing what you think? It's often really useful to read what one person thinks about several places (e.g. if we both like place A, and you like place B, that gives me more confidence that I'll like place B too).
Edit: I just noticed you have this too! I didn't realise there was additional information if you click on a pin rather than just mouse-over.
Also, what qualifies as a "chain"? I notice you have The Gate on there, but they have two locations, and you only have the one at Islington (and not the one at Hammersmith).