My side projects, feedback request

I am creating several projects on top of Blockstack. Most of them are serverless and I will opensource all of them by next month. Would love to hear suggestions on how I can improve the reach of our apps. The goal is to improve SEO and get traffic from there, does this scale? Is it possible for a single studio launch several apps that become popular only relying on search engines?

pNotes is a private space for notes
http://pnotes.online/

SafeNotes is an encrypted pdf annotation tool
https://safenotes.co/

BitPatron is a decentralized patreon alternative
https://bitpatron.co/

Photo Vault is an encrypted Google Photos alternative
http://photovault.online/

PDFstack is a pdf split & merger tool
https://pdfstack.online/

Bitcoin4Photos is a marketplace to buy and sell stock photos
https://bitcoin4photos.net/

pForms is a simple yet powerful form builder
https://pforms.net/

MiniHabits is a private habit tracker
http://minihabits.co/

Memocards is a flashcards app
http://memocards.net/

Moodify is a private mood tracker
http://moodify.cc/

pBookmarks is a decentralized bookmark manager
http://pbookmarks.online/

Any feedback would be appreciated.