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It’s Back! The T1D1 App Is Available for Download!
The First FREE, Over-the-Counter FDA-Cleared Insulin Calculator App for Type 1 Diabetes Management

For Immediate Release

October 21, 2025
​​Author: Laura Mendelow, T1D1 (501(c)(3))
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Gaithersburg, MD USA – [October 21, 2025] – We can’t believe the day is finally here! After nearly five years in the making (almost to the day that Drew Mendelow was diagnosed with Type 1 diabetes) the T1D1 app is officially live on the Apple App Store and Google Play!
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T1D1 isn’t just another app, it’s the first-ever FDA-cleared, over-the-counter insulin calculator app designed to help people living with Type 1 diabetes (T1D) confidently manage their care. And, it's completely FREE!! Whether you’re newly diagnosed or a T1D veteran using multiple daily injections (MDI), T1D1 makes it easier to calculate insulin doses, track your data, and share insights with your healthcare team, all in one simple, easy-to-use place. [Review the QUICK GUIDE tutorial to learn more].
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And here’s the best part: T1D1 was founded by teen innovator, Drew Mendelow, who created the app after his own T1D diagnosis. At just 13 years old, Drew wanted better tools to help manage his condition. When he couldn’t find one, he built it. What started as a personal project became a groundbreaking app that’s now helping others across the T1D community.
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This milestone has been years in the making, and it wouldn’t have been possible without our amazing partners:
  • Diabetes Center Berne who funded this project and believed in Drew’s vision from the start. 
  • Comerge AG , the registered manufacturer, enlisted a team of software engineers, regulatory experts, and design professionals to ensure T1D1 was FDA-ready.
  • Dexcom graciously conducted the Human Factors study to ensure safety and accuracy. ​
“I wanted to create something that would make living with Type 1 diabetes easier, not just for me, but for anyone facing the same challenges,” said Drew Mendelow, Founder of T1D1. “It’s surreal to see this idea finally come to life and be available for others to use.”
Read more about Drew's story

Help us spread the word!

Please take one minute to share this article with your healthcare team, educators, school nurses, and others who are currently on MDI. Together, we can help close the gap and make life just a little easier for those with Type 1 Diabetes. 

Help us keep T1D1 FREE for all

Our goal is to make T1D1 available to everyone who needs it, at no cost. If you’d like to support this mission, please consider making a donation or contact us directly if you're interested in being a corporate sponsor. Your contribution helps us maintain the app, enhance features, and continue providing this life-changing resource for free to families and individuals managing Type 1 diabetes.
DONATE TODAY!

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