Comparison

YAM vs gemgem400

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

Head to head
About

YAM

Features
Read full description

At Yam-E Coding, children can experience the principles of programming and knowledge of software through fun coding classes. Yam-E is the first coding education service composed of an open world and metaverse. Unlike conventional coding education services, Yam-E World adopts a Zone-based open-world approach to elevate the level of children's engagement and user experience. The current version consists of a starting village, but Yam-E World plans to expand further, adding interesting and educational islands in the future. In the starting village of Yam-E World, children can learn software concepts, understand principles, and solve problems on their own. Even with excellent education and services, if children cannot concentrate and immerse themselves, the education becomes inevitably didactic. Yam-E Coding, developed over a period of three years by educators and content developers, aims to strike a balance between concentration, fun, and education. In essence, Yam-E Coding aims for children to learn and solve problems on their own, even without parents or educators. It incorporates the concept of the metaverse into the coding block service, allowing children to explore and learn desired content on their own. The initial mission focuses on familiarizing children with coding blocks, and subsequently, sequential, iterative, selective, and special missions become available. Instead of following a repetitive curriculum, Yam-E Coding adopts an 'Open Class Progress' approach, allowing children to choose missions and progress at their own pace. Children can unleash their creativity and imagination through diverse and enjoyable coding lessons in open missions. Yam-E Coding's unique classes avoid the standardized teaching approach of presenting problems and finding solutions. Yam-E Coding values the process and emphasizes how missions are solved based on different ideas. In other words, instead of simple missions like moving forward, left, or right, children must think and ponder to solve coding missions in given situations. Yam-E Coding classes incorporate various devices to stimulate children's imagination and creativity. Interactive mission structures are scattered throughout, making children think about how to act to solve problems. The latest technology is applied, incorporating physics engines to create sliding ice paths, wind that pushes objects backward, and the ability to move objects by adjusting the strength of force. Additionally, applying the Pythagorean theorem's properties in mathematics allows creating diagonal movements to solve problems with different variables. Wow, Even This?! To soothe children's tired minds and brains, Yam-E Coding incorporates special music. Yam-E Coding collaborated with a studio specializing in composing music that positively influences the brain, creating eight songs for Yam-E. Brain music induces vibration activities related to neuroplasticity, using positive emotions and a low arousal level scale. It uses scales that decrease the activity levels of biomarkers that indicate stress. Yam-E's Learning Management Yam-E Coding provides information related to coding block classes easily and quickly through the Yam-E Coding app and the parent page on the Yam-E website. The My Room feature in the Yam-E Coding app allows users to check this information, and it is designed to show numeric data and situation graphs at the children's eye level. The design ensures that children can easily understand what the graph represents, allowing them to assess the current situation and think about how to utilize Yam-E Coding on their own. Additionally, the website's parent page provides detailed information about children's learning situations. It goes beyond what children see, allowing parents to closely monitor and analyze their child's learning situation. Parents can deeply consider what missions and knowledge their child is interested in, and what cognitive abilities they excel in.

About

gemgem400

Engaging rehabilitation games designed to help individuals with limited movement on one side of the body or those needing fine motor skill improvement. The app encourages daily voluntary movements to promote neuroplasticity and build confidence through playful activities.

Highlights
  • Playful rehabilitation games
  • Fine motor skill improvement
  • Encourages voluntary movements
  • Promotes neuroplasticity
  • Builds self-confidence
  • Regularly updated content
Features
Read full description

Enjoy Fun and Engaging Rehab Games at Home with Gemgem 400! ■ Who is it for? Our game is designed for individuals with limited movement on one side of the body or those who need fine motor rehabilitation. ■ Why “400”? Because performing 400 voluntary movements a day helps activate neuroplasticity in the brain, encouraging the formation of new neural pathways. ■ How effective is it? The key is quantity and autonomy! In other words, encouraging people to move more, on their own, is what really matters. In fact, both caregivers and developers were amazed at the changes experienced by users who consistently played GemGem 400. ■ What kinds of games are included? Jump, run, pop! We offer a variety of adventures that everyone can enjoy — with new content being added regularly. With the valuable feedback of caregivers, our service continues to improve every day. ■ Our goals are to: 1. Grow with joy through gaming 2. Build self-confidence 3. Support each person’s dreams for the future Gemgem 400 cheers on everyone who is reaching toward new possibilities! End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

YAM4 screens
gemgem4004 screens

Verdict

The call

The clearest difference is iOS requirement: YAM at 12.0 against gemgem400's 15.0. On price, update cadence, 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. YAM sells 3 one-off in-app purchases and gemgem400 sells 5 in-app purchases, starting at $79.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

YAM ships an update every 10 days, gemgem400 fortnightly. The most recent releases landed on September 15, 2026 and September 21, 2026 respectively.

Scorecard1 real difference · 9 level
YAM versus gemgem400: the parameters behind the verdict, then further details
ParameterYAMgemgem400
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 10 days — betterFortnightly
AdsNoNo
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size599 MB274 MB
Age rating4+4+
Developerweclover. Inc.Gemgem therapeutics Inc.

In-app purchases

3 purchases

YAM

One-time3
  • 1개월 이용권$9.99
  • 3개월 이용권$29.99
  • 12개월 이용권$99.99
5 purchases

gemgem400

Subscriptions5
  • 잼잼400 정기 구독(Silver)$79.991 Month
  • 잼잼400 정기 구독(Gold)$99.991 Month
  • 잼잼400 정기 구독 - BASIC$149.991 Month
Show 2 more
  • 잼잼400 정기 구독 - SILVER$199.991 Month
  • 잼잼400 정기 구독 - GOLD$389.991 Month

Questions

Is YAM free?
YAM is free to download, with in-app purchases available.
Is gemgem400 free?
gemgem400 is free to download, with in-app purchases available.
Do YAM or gemgem400 have ads?
Neither YAM nor gemgem400 shows ads.
Which is updated more often, YAM or gemgem400?
YAM ships an update every 10 days, and gemgem400 fortnightly. Most recently, YAM was updated on September 15, 2026 and gemgem400 on September 21, 2026.

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