This is a great piece of software and I highly recommend it
I bought Inbox on AppSumo in 2021 which is quite a while ago, and honestly, it’s one of the few tools that’s genuinely kept improving over time rather than disappearing into the usual startup graveyard.
The team have clearly continued developing it properly, and it now feels like a solid, reliable piece of software rather than an unfinished “coming soon” product.
What I like most is that it’s become more polished, more capable, and more useful the longer I’ve had it.
I’m actually surprised it’s still available on AppSumo. If the lifetime deal is still there and you think you’d use it, I’d seriously grab it while you can.
Definitely one of the better AppSumo purchases I’ve made.
Founder Team
Emin_Inbox
May 13, 2026
This honestly means a lot 🙏
One of our biggest goals since 2021 has been to keep improving INBOX instead of becoming another abandoned startup product, so reading this made the whole team really happy.
Thank you for noticing the progress and for supporting us for so long. We’re still building every day ❤️
Building a Healthcare ERP in a growing market like Indonesia, Klinikita Indonesia, means we need to move fast. UseInbox gives us the infrastructure to scale our outreach without the skyrocketing costs of other platforms. The A/B testing feature allowed us to refine our messaging for medical practitioners, significantly increasing our conversion from free trial to paid subscribers. This is a high-value investment for any digital product owner.
Founder Team
Emin_Inbox
May 13, 2026
Love hearing this 🙏
Building in healthcare is not easy, so it’s amazing to hear INBOX has been helping Klinikita scale outreach more efficiently and improve conversions with A/B testing.
Thank you for trusting us to be part of your growth journey — comments like this motivate our whole team ❤️
I bought Inbox a few years back and have not regreted it. It is one of the best email marketing tools that I have used and I highly recommend it. The best part of buying here on Appsumo is that I no longer have to pay a monthly fee for my email marketing.
Founder Team
Emin_Inbox
May 13, 2026
This made me smile 🙏
Really happy to hear INBOX has been one of your best AppSumo purchases and continues to help with your email marketing without the monthly costs.
Thank you for the support and recommendation — we truly appreciate it ❤️
UseInbox: A Powerful and User-Friendly Email Marketing Tool
5-Star Review for UseInbox
I have been using UseInbox for a while now, and I am extremely happy with the results. This tool offers everything I need for effective email marketing, all in one place.
The flexible campaign design helps me create personalized and engaging emails easily. One of my favorite features is the automatic resend to contacts who didn’t open the first email — it has really improved my open rates. The advanced segmentation options let me target different customer groups precisely, which makes my campaigns much more effective.
Managing multiple brands from one account is a huge time-saver and cost-efficient, as I don’t need separate tools for each brand. The customer support team is friendly, responsive, and always ready to assist whenever I have questions.
Overall, UseInbox is a powerful, reliable, and easy-to-use platform that I highly recommend for anyone looking to improve their email marketing efforts.
Founder Team
Emin_Inbox
May 13, 2026
Thank you so much for taking the time to share such a detailed review.
We’re really glad to hear that UseInbox is helping you improve your email marketing results and that features like campaign design flexibility, smart resends, and segmentation are making a real impact on your open rates and targeting.
It’s also great to know that managing multiple brands from a single account is saving you...
We have been using INBOX since 2023, and overall we are very happy with it.
We have tried other similar marketing tools, but INBOX is the one that works best for us and adapts better to our needs. It gives you a lot of flexibility when designing campaigns, and features such as automatically resending a campaign to contacts who did not open it are very useful.
It also allows you to segment customer lists properly, which helps a lot when managing different types of campaigns. In general, it is a very complete tool and totally recommended.
On top of that, the customer support team is always willing to answer questions and help whenever needed.
Founder Team
Emin_Inbox
May 13, 2026
Thank you so much for sharing this!
We’re really happy to hear that INBOX has been working well for you since 2023 and that it stands out compared to other tools you’ve tried. It’s especially great to know that the flexibility in campaign design, smart resends, and segmentation features are making a real difference in your workflow and results.
Verified purchaser
This is a great piece of software and I highly recommend it
I bought Inbox on AppSumo in 2021 which is quite a while ago, and honestly, it’s one of the few tools that’s genuinely kept improving over time rather than disappearing into the usual startup graveyard.
The team have clearly continued developing it properly, and it now feels like a solid, reliable piece of software rather than an unfinished “coming soon” product.
What I like most is that it’s become more polished, more capable, and more useful the longer I’ve had it.
I’m actually surprised it’s still available on AppSumo. If the lifetime deal is still there and you think you’d use it, I’d seriously grab it while you can.
Definitely one of the better AppSumo purchases I’ve made.
Emin_Inbox
May 13, 2026This honestly means a lot 🙏
One of our biggest goals since 2021 has been to keep improving INBOX instead of becoming another abandoned startup product, so reading this made the whole team really happy.
Thank you for noticing the progress and for supporting us for so long. We’re still building every day ❤️
Share INBOX
Verified purchaser
The Ultimate Tool for SaaS Growth
Building a Healthcare ERP in a growing market like Indonesia, Klinikita Indonesia, means we need to move fast. UseInbox gives us the infrastructure to scale our outreach without the skyrocketing costs of other platforms. The A/B testing feature allowed us to refine our messaging for medical practitioners, significantly increasing our conversion from free trial to paid subscribers. This is a high-value investment for any digital product owner.
Emin_Inbox
May 13, 2026Love hearing this 🙏
Building in healthcare is not easy, so it’s amazing to hear INBOX has been helping Klinikita scale outreach more efficiently and improve conversions with A/B testing.
Thank you for trusting us to be part of your growth journey — comments like this motivate our whole team ❤️
Share INBOX
Verified purchaser
One of my best purchases!
I bought Inbox a few years back and have not regreted it. It is one of the best email marketing tools that I have used and I highly recommend it. The best part of buying here on Appsumo is that I no longer have to pay a monthly fee for my email marketing.
Emin_Inbox
May 13, 2026This made me smile 🙏
Really happy to hear INBOX has been one of your best AppSumo purchases and continues to help with your email marketing without the monthly costs.
Thank you for the support and recommendation — we truly appreciate it ❤️
Share INBOX
Verified purchaser
UseInbox: A Powerful and User-Friendly Email Marketing Tool
5-Star Review for UseInbox
I have been using UseInbox for a while now, and I am extremely happy with the results. This tool offers everything I need for effective email marketing, all in one place.
The flexible campaign design helps me create personalized and engaging emails easily. One of my favorite features is the automatic resend to contacts who didn’t open the first email — it has really improved my open rates. The advanced segmentation options let me target different customer groups precisely, which makes my campaigns much more effective.
Managing multiple brands from one account is a huge time-saver and cost-efficient, as I don’t need separate tools for each brand. The customer support team is friendly, responsive, and always ready to assist whenever I have questions.
Overall, UseInbox is a powerful, reliable, and easy-to-use platform that I highly recommend for anyone looking to improve their email marketing efforts.
Emin_Inbox
May 13, 2026Thank you so much for taking the time to share such a detailed review.
We’re really glad to hear that UseInbox is helping you improve your email marketing results and that features like campaign design flexibility, smart resends, and segmentation are making a real impact on your open rates and targeting.
It’s also great to know that managing multiple brands from a single account is saving you...
Share INBOX
Verified purchaser
100% Worth it!
We have been using INBOX since 2023, and overall we are very happy with it.
We have tried other similar marketing tools, but INBOX is the one that works best for us and adapts better to our needs. It gives you a lot of flexibility when designing campaigns, and features such as automatically resending a campaign to contacts who did not open it are very useful.
It also allows you to segment customer lists properly, which helps a lot when managing different types of campaigns. In general, it is a very complete tool and totally recommended.
On top of that, the customer support team is always willing to answer questions and help whenever needed.
Emin_Inbox
May 13, 2026Thank you so much for sharing this!
We’re really happy to hear that INBOX has been working well for you since 2023 and that it stands out compared to other tools you’ve tried. It’s especially great to know that the flexibility in campaign design, smart resends, and segmentation features are making a real difference in your workflow and results.
We also appreciate your kind words about our...
Share INBOX