M21 vs 六鸭Gaa
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
M21
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【M21-3X特工】是密室逃脱升级版，一款学霸专属的游戏！！让你的脑力与体力High起来！！ 也是一款城市实景探索解谜游戏，玩法新颖。玩家以特工身份通过APP接收任务 ，穿梭于商场或公园等搜寻通关线索，完成各种难度的特工解谜任务，在更广阔的空间感受烧脑体验！！ 我们不一样，不做传统、不玩机关、没有惊吓与夸张的装备，手机是你的通关工具，需要你在杂乱的环境中挑战你的观察力、逻辑力、协作力！！ 任务模式：单人任务、双人任务、内奸任务、团建任务等！ 游戏人数不限，可多人同时进行！
六鸭Gaa
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六鸭Gaa是一款基于真实地图，提供用户在地图上进行个性化标记和互动的社交应用软件。 致力于为年轻用户群体提供更多理由走出家门，去探索和记录线下生活的美好。目前提供以下功能项： 地图探索——看看附近有趣的人和动态，带六鸭出门走走总能发觉更多惊喜 发布动态——在地图上记录你的moment，喊出生活态度连接共鸣好友 群组消息——基于相近坐标和共同爱好的兴趣群，丰富玩法更新中越玩越有趣
Screenshots
Verdict
M21 and 六鸭Gaa are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
M21 ships an update every 5 weeks, 六鸭Gaa every 3 weeks. The most recent releases landed on October 4, 2026 and October 14, 2026 respectively.
| Parameter | M21 | 六鸭Gaa |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 weeks | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 12.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 65 MB | 84 MB |
| Age rating | 9+ | 17+ |
| Developer | 广州惟为网络科技有限公司 | Wuhan October Technology Co.,Ltd |
In-app purchases
M21
No in-app purchases
六鸭Gaa
No in-app purchases
