Comparison

Sandboxx vs Calvary Dover

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

Calvary Dover

Stay connected with your church community and access the latest sermons and event reminders. This app provides a direct link to church content and updates, making it easy to engage with the community from anywhere.

Highlights
  • Watch latest sermons
  • Stay connected with church
  • Receive event reminders
  • Access community updates
  • Engage with church content
Features
Read full description

Access the latest content from Calvary Church, connect with us, and stay up to date with what is happening in our community - anywhere, anytime The Calvary Dover app makes it easy to... - Watch all the latest sermons - Stay connected with Calvary - Receive event Reminders Calvary Church is not just another church. We began as a small group of ordinary people in Edna Gooden’s kitchen sharing a common goal to know Jesus and share His life-transforming love with Kent County. That love has touched hundreds to thousands as we have reached out to meet the physical, social, mental and spiritual needs of our community for over sixty years.

Screenshots

Sandboxx4 screens
Calvary Dover3 screens

Verdict

The call

The clearest difference is update cadence: Sandboxx at every 10 days against Calvary Dover's every 12 months. Sandboxx also leads on ratings volume (182K vs 5) and chart position (#107 vs unranked). Calvary Dover's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (12.0 vs 17.6). On price, rating, ads and in-app purchases 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 Calvary Dover. That said, the two scores are not equally well evidenced: Sandboxx has 182K ratings behind it against 5, so its average is the more settled of the two.

UpkeepUpdate frequency

Sandboxx ships an update every 10 days, Calvary Dover every 12 months. The most recent releases landed on November 9, 2026 and November 2, 2026 respectively.

Scorecard5 real differences · 6 level
Sandboxx versus Calvary Dover: the parameters behind the verdict, then further details
ParameterSandboxxCalvary Dover
PriceFreeFree
Rating4.9 (182K ratings)5.0 (5 ratings) — better
Positive reviews72.9% of reviews—
Number of ratings182K — better5
Update frequencyEvery 10 days — betterEvery 12 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree with in-app purchasesFree — better
Best chart rank#107 — better—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.612.0 — better
Further details — not scored
Size122 MB44 MB
Age rating4+12+
DeveloperSandboxx, Inc.THE CALVARY ASSEMBLY OF GOD CHURCH, INC.,

Customer experience

Sandboxx

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

Calvary Dover

All ratings5 ratings
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

Calvary Dover

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Sandboxx

No in-app purchases

None

Calvary Dover

No in-app purchases

Questions

Is Sandboxx free?
Sandboxx is free to download, with no in-app purchases.
Is Calvary Dover free?
Calvary Dover is free to download, with no in-app purchases.
Which has better reviews, Sandboxx or Calvary Dover?
Calvary Dover is rated higher. Sandboxx averages 4.9 out of 5 from 182K ratings, while Calvary Dover averages 5.0 from 5 ratings.
Do Sandboxx or Calvary Dover have ads?
Neither Sandboxx nor Calvary Dover shows ads.
Which is updated more often, Sandboxx or Calvary Dover?
Sandboxx ships an update every 10 days, and Calvary Dover every 12 months. Most recently, Sandboxx was updated on November 9, 2026 and Calvary Dover on November 2, 2026.

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