Sandboxx vs Calvary Dover
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Digital letter writing
- Overnight shipping
- Letter tracking
- Weekly training updates
- Military news
- Gift card options
- Veteran support staff
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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.
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.
- Watch latest sermons
- Stay connected with church
- Receive event reminders
- Access community updates
- Engage with church content
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
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.
| Parameter | Sandboxx | Calvary Dover |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (182K ratings) | 5.0 (5 ratings) — better |
| Positive reviews | 72.9% of reviews | — |
| Number of ratings | 182K — better | 5 |
| Update frequency | Every 10 days — better | Every 12 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | Free — better |
| Best chart rank | #107 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 122 MB | 44 MB |
| Age rating | 4+ | 12+ |
| Developer | Sandboxx, Inc. | THE CALVARY ASSEMBLY OF GOD CHURCH, INC., |
Customer experience
Sandboxx
Calvary Dover
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
Sandboxx
No in-app purchases
Calvary Dover
No in-app purchases
Questions
Is Sandboxx free?
Is Calvary Dover free?
Which has better reviews, Sandboxx or Calvary Dover?
Do Sandboxx or Calvary Dover have ads?
Which is updated more often, Sandboxx or Calvary Dover?
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