It's all home-grown solution. Sync was definitely hard but it was one of my top priorities from the very beginning. Though it definitely still needs a bit of an improvement but it's working beautifully at the moment.
Congratulations! I think sync is much easier when it's done up front rather than bolted on later.
I'm wondering if sync might have stalled the Momento guys - they had big plans for Android and iPad versions but haven't brought anything out besides small fixes in over a year. (Disclosure: I'm in the iOS diary space too).
Sync is coming for Insomnia in the next few weeks so stay tuned for that. Also, be sure to reach out and let me know what you think could be improved :)
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