Comparison

Sandboxx vs Camp Carl

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Sandboxx

Easily send digital letters, photos, and gift cards to service members in basic training and beyond. Receive weekly training updates and access military news and products. Developed by veterans to support the military community.

Highlights
  • Digital letter writing
  • Overnight shipping
  • Letter tracking
  • Weekly training updates
  • Military news
  • Gift card options
  • Veteran support staff
Features
Currently charting
Read full description

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 6 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 1 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 a photo 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 Earn badges and become your recruit’s ultimate supporter No Federal or DoD Endorsement Implied. Love the app? Rate us! Have a question or need help? Email us at happiness@sandboxx.us, we'd love to hear from you.

About

Camp Carl

Stay connected with your camper by sending messages and receiving daily updates. View photos and videos of camp activities, and get instant notifications when your child is featured. This app provides a front-row seat to camp life for parents and families.

Highlights
  • Send Bunk Notes to campers
  • View camp photos and videos
  • Receive photo notifications
  • Daily updates feed
  • Instant notifications for camper updates
Features
Read full description

Stay connected with the Camp Carl app! Send Bunk Notes to your camper that will be hand delivered to them each day. See all the photos Camp Carl uploads during the camp week and get notified whenever photos of your camper are detected. Check in with camp daily with the Updates Feed to see photos, videos and status updates that give you a front row seat to camp life. You can opt in to receive notifications about your camper delivered instantly to your phone. Designed for parents and families to be the first to know what's happening at camp this summer and beyond.

Screenshots

Sandboxx4 screens
Camp Carl4 screens

Verdict

The call

The clearest difference is ads: Sandboxx at none against Camp Carl's shown. Sandboxx also leads on update cadence (every 10 days vs every 12 months) and ratings volume (182K vs 13). Camp Carl's advantage is review sentiment (100% vs 73%) and monetization model (ad-supported vs free with in-app purchases). On price, rating, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for Sandboxx against 5.0 for Camp Carl. That said, the two scores are not equally well evidenced: Sandboxx has 182K ratings behind it against 13, so its average is the more settled of the two. Written reviews are what separate them: 73% of Sandboxx's written reviews are positive against 100% of Camp Carl's.

UpkeepUpdate frequency

Sandboxx ships an update every 10 days, Camp Carl every 12 months. The most recent releases landed on November 8, 2026 and November 3, 2026 respectively.

Scorecard7 real differences · 4 level
Sandboxx versus Camp Carl: the parameters behind the verdict, then further details
ParameterSandboxxCamp Carl
PriceFreeFree
Rating4.9 (182K ratings)5.0 (13 ratings) — better
Positive reviews72.9% of reviews100.0% of reviews — better
Number of ratings182K — better13
Update frequencyEvery 10 days — betterEvery 12 months
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree with in-app purchasesAd-supported — better
Best chart rank#96 — better—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.611.0 — better
Further details — not scored
Size122 MB108 MB
Age rating4+4+
DeveloperSandboxx, Inc.Tom Sullivan

Customer experience

Sandboxx

All ratings180,253 ratings
Positive96.9%
Neutral1.5%
Negative1.5%
Written reviews1,019 reviews
Positive72.9%
Neutral6.0%
Negative21.1%

Camp Carl

All ratings13 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Sandboxx

Reported bugs

3 issues
  • Login issues and password reset problems
  • Inconsistent letter delivery tracking
  • Incorrect recruit information entered by Sandboxx

Requested features

5 requests
  • Allow editing of letters before sending
  • Increase photo upload limit
  • Provide refund or credit expiration policy
  • Improve in-app search and address management
  • Sync weekly updates with recruit's actual schedule

Camp Carl

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Sandboxx

No in-app purchases

None

Camp Carl

No in-app purchases

Questions

Is Sandboxx free?
Sandboxx is free to download, with no in-app purchases.
Is Camp Carl free?
Camp Carl is free to download, with no in-app purchases.
Which has better reviews, Sandboxx or Camp Carl?
Camp Carl is rated higher. Sandboxx averages 4.9 out of 5 from 182K ratings, while Camp Carl averages 5.0 from 13 ratings.
Do Sandboxx or Camp Carl have ads?
Camp Carl shows ads; Sandboxx does not.
Which is updated more often, Sandboxx or Camp Carl?
Sandboxx ships an update every 10 days, and Camp Carl every 12 months. Most recently, Sandboxx was updated on November 8, 2026 and Camp Carl on November 3, 2026.

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