Superhuman
Shortwave
Spark Mail
Gmail
Sanebox
Airmail
Mailspring
Canary Mail
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.
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Based on our record, Superhuman seems to be more popular. It has been mentiond 26 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.
A Superhuman-style email interface with a clean inbox and focused email preview. - Source: dev.to / 2 months ago
Remember I said that some apps address these issues much better than others? Recent famous examples are Linear and Figma. Both have disrupted incredibly competitive markets by being technologically superior. Other examples are Superhuman and a decade prior, Trello. When you look into what they did, you discover that they all converged on very similar patterns, and they all developed their respective... - Source: dev.to / about 2 years ago
Then there is the mother of all. Superhuman, advocating for productivity in emails:. - Source: dev.to / about 2 years ago
Email is one of those unavoidable things that can eat up a ton of our time -- while causing a great deal of anxiety to boot. Superhuman is an AI-powered email app designed for busy professionals seeking a blazingly fast email experience. With dozens of features like automatically prioritizing emails based on the recipient, follow-up reminders, automated phrases and email copy, along with event scheduling,... - Source: dev.to / almost 3 years ago
Other tools I use: Superhuman for Email, Akiflow for tasks and calendar, Roam for notes/PKB, and one sec to reduce opening distracting apps. Source: about 3 years ago
Shortwave - Email smarter & faster with a reinvented experience for your Gmail
GlockApps - G-Lock Apps is an interesting tool that might seem simple to some, but is quite essential to most online marketers.
Spark Mail - Spark helps you take your inbox under control. Instantly see whatโs important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues
Email Testing By Inbox Pirates - Preview, Analyze & Test emails with one click.
Gmail - Gmail is available across all your devices Android, iOS, and desktop devices. Sort, collaborate or call a friend without leaving your inbox.
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 ...