Submit.co
Instaaa
pressfarm
Submit Juice
Promotehour
Aidem Network
Hey Press
Newsletter Spy
InboxStack
GlockApps
Email Testing By Inbox Pirates
Validity LLC
MxToolBox
Folderly
HetrixTools
Inbox AI
InboxStack is an email deliverability intelligence platform built for teams who need to know why their emails aren't reaching the inbox โ not just that they aren't. At its core is Brain, a proprietary causal AI engine trained on a 22-year deliverability knowledge base, which correlates signals across your ESP, DNS authentication records (SPF, DKIM, DMARC), Google Postmaster Tools, Microsoft SNDS, and 50+ blocklists to pinpoint root causes instead of surfacing raw metrics.
Most deliverability tools stop at monitoring: they show you a drop in inbox placement or a blocklist hit and leave you to investigate. InboxStack goes further, tracing the actual causal chain โ a DKIM misalignment, a reputation dip on a specific sending IP, a content trigger โ so you can fix the real problem instead of guessing.
Setup takes minutes with no migration required: forward your email headers for an instant DNS/authentication audit, or connect your existing ESP and Postmaster accounts for ongoing monitoring. Optional seed testing gives you real inbox-vs-spam placement data across major providers.
Built for agencies managing multiple client domains and growing companies who've outgrown basic authentication checkers, InboxStack turns deliverability from a black box into a diagnosable, fixable system.
InboxStackBased on our record, Submit.co seems to be more popular. It has been mentiond 3 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Fun story: I built BetaList 16 years ago which was one of the first "product discovery" platforms. Years before Product Hunt, etc. I manually reviewed every submission and unfortunately often I had to tell founders that their startup didn't qualify to be included. Almost everyone would (understandably!) argue their case, but as volume increased I couldn't afford to go into a deep argument with every single... - Source: Hacker News / about 1 month ago
First, I crawled and audited all the available data from similar lists. Startup directories, such as those found on GitHub and Submit.co websites are the few standing out in terms of quality. - Source: dev.to / over 3 years ago
Very cool. Just submitted to submit.co. Source: about 5 years ago
Instaaa - Promote your startup using AI-powered outreach
GlockApps - G-Lock Apps is an interesting tool that might seem simple to some, but is quite essential to most online marketers.
pressfarm - Pressfarm helps entrepreneurs find journalists to write about their startups.
Email Testing By Inbox Pirates - Preview, Analyze & Test emails with one click.
Submit Juice - Free and curated list of startup directories to promote your new startup. We manually post your startup to more than 150+ relevant directories and blogs to help your startup get discovered.
Validity LLC - Founded in 2010, located in Essex Countyโs City of Orange, NJ, and serving all 50 states of the U.S., Validity, LLC is considered a โOne Stop Shopโ for ...
