20.7K reviews
Content rating
Everyone
1M+
Downloads
Content rating
Everyone
Users Interact, Digital Purchases
Learn more
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About this app

Developed by veterans with decades of service, our mission is to support service members and their supporters throughout their military journey.

Sending letters to basic training and beyond has never been easier. With over 8 million letters sent to date, we have revolutionized the way you think of supporting your service member. A fully digital letter writing experience, overnight shipping, tracking and the option to add gift cards makes Sandboxx the ultimate supporter tool.

With a growing community of over 2 million Sandboxx users, we are continuing to build more products to help. Get access to base specific training updates from within the app as your recruit progresses through basic training. Refer friends and family to earn free Letters and ensure your service member can receive even more mail.

Check out Sandboxx News to stay up to date with all that's going on in the military space. Grab some additional stamps, newsletters or motivation to mail your recruit in the Sandboxx Shop.

With Sandboxx, we've got you covered for all your basic training needs.

SEND LETTERS TO BASIC TRAINING AND BEYOND
The easiest way to send letters to basic training or overseas. Send a letter, anytime, anywhere. We physically print your mail, include return stationery, provide tracking and overnight it to your recruit at any recruiting base.

GET WEEKLY TRAINING UPDATES
Stay up to date on your recruit as they progress through basic training. Learn about what they are going through on a weekly basis, all accessible within the Sandboxx app.

LEARN MORE WITH SANDBOXX NEWS
Your essential source of news from within the military space, Sandboxx News brings you a wealth of information to stay up to date on the ever evolving world of military life. Covering news to lifestyle to military affairs, the Sandboxx Editorial team brings decades of real life experience and education straight to your phone.

GET EXCLUSIVE SANDBOXX PRODUCTS
Whether you want to purchase military apparel for yourself or set up a daily mail send for your recruit, the Sandboxx Shop stocks a wide variety of recruit and supporter centric products that are sure to delight your recruit's entire support system.

• OPSEC and PERSEC compliant
• Automatically connect with your service member to easily send letters
• Write your letter, add photos and gift card and send within minutes
• Track your letter from Sandboxx HQ to the base mailroom
• Access to customer support fully staffed by veterans and military spouses

No Federal or DoD Endorsement Implied.
Send Letters Overnight to Your Recruit
Updated on
Sep 11, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    Location, Personal info, and Device or other IDs
  • This app may collect these data types
    Location, Personal info and 6 others
  • Data is encrypted in transit
  • You can request that data be deleted

Ratings and reviews

20.4K reviews
Courtney Smith
July 2, 2026
The app seems a little predatory on pricing. The interface on the app doesn't work right, so use the website. It claims on the app that you get a free letter, but you don't. I wrote out the whole thing for the first free letter, saved it, then was prompted to buy a letter package. I purchased the $15/5 letters, and then poof! Letter gone. After searching the app to no avail, I got on the computer and logged in. Luckily my letter was there! And no free letters when people use the link you share.
9 people found this review helpful
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Chase Edmonson
July 9, 2026
For the most part, this app is great. I've been able to communicate with my girlfriend between phone calls and show her my support. The only issue is I've had multiple letters say they'd be delivered the next day, and they took longer than claimed. My most recent issue was a letter I sent on the 1st of July, and it still says in transit. I really wish the next day delivery was a garuntee and not a maybe.
6 people found this review helpful
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Debra Garza
July 5, 2026
Update-the app shows the letter has not been delivered. Someone from Sandboxx did reach out to me quickly and shared a notification that the letter was delivered when promised. A glitch caused the problem It sounds great, but the delivery is no faster than regular mail. I sent a letter on June 30th, well before the cut-off to be delivered before the July 4th holiday. It's July 4th, and the letter hasn't been delivered to the base yet. If you say you're going to provide a service, then do it.
12 people found this review helpful
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Sandboxx, Inc.
July 5, 2026
Hi Debra- I just sent you a message with the delivery verification attached. Your letter was successfully delivered to the mailroom on Thursday. Please reach out to our Customer Happiness Team if you have any other questions.

What’s new

We update Sandboxx frequently to support you throughout your military journey. This release includes:

- General bug fixes and maintenance

Love the app? Rate us! Have a question or need help? Email us at happiness@sandboxx.us, we'd love to hear from you.