Sandboxx vs CurlCue
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.
CurlCue
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CurlCue scores a hair product against your hair. Not against a universal good-or-bad list. Two people can scan the same bottle and get two different scores, because a rich butter that rescues coarse, low-porosity coils will flatten fine waves, and a clarifying wash that saves one scalp will strip another. Every other scanner tells both people the same thing. CurlCue doesn't. HOW A SCORE IS BUILT Every ingredient is read three ways: what it is doing in the formula, whether it belongs in this kind of product, and how it behaves on your hair specifically. A protein is not simply "good". It is good in a bond repair mask, unremarkable in a rinse-out, and a mistake on hair that is already protein-sensitive. Health comes first and it can veto. If a product will build up on you, strip you, or irritate your scalp, the score is cut before anything else is considered, and the app shows you the cut in points rather than hiding it in a percentage. Only then does CurlCue ask the second question: does this move you toward the look you actually want? Because those are different questions. Moisture is a health property. Shine is a preference. Wanting deeply hydrated hair with a matte finish is a perfectly ordinary thing to want, and CurlCue can express it. FOR EVERY HAIR TYPE 1a through 4c. Straight, wavy, curly, coily. Fine or coarse, low or high porosity, oily or dry or reactive scalp. No assumption about your gender is made anywhere in the app. WHAT YOU CAN DO Scan a barcode for an instant score against your profile. Photograph an ingredient list and have it read and scored on the spot. Compare two products side by side before you spend anything. Build a routine that is scored as a whole, because products work as a set. Track it with streaks and check-ins that reward actually doing it. Follow people whose hair is like yours and see what is working for them. Ask the CurlCue AI what to do next, in plain language. THE HONEST PART There are hundreds of thousands of hair products in the world, and CurlCue has catalogued a fraction of them. You will scan a bottle it does not recognise yet. That is not a dead end: photograph the ingredients and CurlCue reads the label and scores it for you right there. Add the front of the bottle and the product joins the catalogue permanently, so the next person only has to scan the barcode. We would rather tell you this now than have you find out on your third scan. CURLCUE PRO A free account reads five ingredient labels a week, and every product you contribute earns you more. Pro lifts that to 30 label reads a day and opens side-by-side comparison and deeper AI routine coaching. Both plans start with a 7-day free trial for new subscribers. Subscriptions are monthly or annual, renew automatically unless turned off at least 24 hours before the period ends, and are managed in your Apple account settings. Payment is charged to your Apple account at confirmation. Any unused part of a free trial is forfeited when a subscription is purchased. Privacy policy: https://curlcue.app/privacy Terms of use: https://curlcue.app/terms
Screenshots
Verdict
The clearest difference is in-app purchases: Sandboxx at none against CurlCue's 2. Sandboxx also leads on chart position (#94 vs unranked). On price, update cadence, ads 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
Both are free to download. CurlCue sells 2 in-app purchases, starting at $4.99 per month. Sandboxx asks for nothing beyond the download.
Sandboxx ships an update every 10 days, CurlCue weekly. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.
| Parameter | Sandboxx | CurlCue |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (180K ratings) — better | — |
| Positive reviews | 72.9% of reviews | — |
| Number of ratings | 180K — better | — |
| Update frequency | Every 10 days | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free with in-app purchases | — |
| Best chart rank | #94 — better | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.6 | 16.0 — better |
| Further details — not scored | ||
| Size | 122 MB | 61 MB |
| Age rating | 4+ | 4+ |
| Developer | Sandboxx, Inc. | Jeovany Gutierrez |
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
CurlCue
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Sandboxx
No in-app purchases
CurlCue
- CurlCue Pro Monthly7 Days trial$4.991 Month
- CurlCue Pro Annual7 Days trial$39.991 Year









