Comparison

Cafactor vs Stresscan

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

Head to head
About

Cafactor

This app models your body's real-time caffeine levels using a scientific pharmacokinetic approach. It helps you understand your caffeine absorption, decay, and personal sleep thresholds, adapting to your unique biology and activity. Connect with health data for an even smarter metabolic coaching experience.

Highlights
  • Real-time caffeine curve modeling
  • Personalized physiological parameters
  • HealthKit integration for adaptive coaching
  • Exercise and sleep-adaptive thresholds
  • HRV & Recovery integration
  • Progressive calibration of half-life
  • Offline, private tracking
Features
Read full description

Caffeine Hourglass is now Cafactor — rebuilt from the ground up. What began as a simple caffeine timer has evolved into a full physiological model that adapts to your biology in real time. Version 2.0 isn't an update. It's a new category of health tool. Know your caffeine. Protect your sleep. Log a drink in seconds. Cafactor computes your real-time caffeine curve using a peer-reviewed pharmacokinetic model — complete with a realistic absorption phase, first-order decay, and your personal biological parameters. See whether you can safely have one more coffee, and exactly when your levels will drop below your personal sleep threshold. Personalised to your body Set your sex, height, weight, and age. Cafactor applies the Boer (1984) lean-body-mass formula to calculate how caffeine distributes in your specific body. Add smoking status, hormonal medication, or pregnancy for a half-life that's truly yours. Your tolerance to caffeine — derived automatically from 7-day history — rounds out the picture. HealthKit: exponentially smarter Connect Apple Health and Cafactor transforms from a tracker into an adaptive metabolic coach: • Exercise modifier — Recent vigorous workouts temporarily speed up your metabolism. Cafactor detects this from HealthKit and adjusts your decay curve automatically. • Sleep-adaptive threshold — Last night's poor sleep tightens your safe window today. Great sleep? More room for your morning ritual. • HRV & Recovery (Apple Watch) — Daily heart-rate variability fuses with sleep quality to create a PhysiologicalState score, shifting your optimal intake windows and adjusting thresholds by up to 40%. • Progressive calibration — Recency-weighted regression over 30 days of sleep and HRV feedback automatically refines your personal half-life, growing from Preliminary to Reliable confidence as data accumulates. Pro features Unlimited history · Trend, sleep quality and scatter charts · Last safe caffeine time · Four smart notifications (morning window, safe window, withdrawal, recovery) · Shareable weekly report · Siri shortcuts · Unlimited custom drinks Free, forever, offline Core tracking is always free. No account. No internet. No data leaves your device — ever.

About

Stresscan

Features
Read full description

谁没有幻想过,自己也有一个系统呢? > 信号接入中…… > 检测到玩家。 > 亚历山大系统已就位,对宿主进行全天侯守护。 Stresscan: Your Alex 是一款结合 Apple Watch 压力侦测、AI 陪伴、压力回溯和即时减压工具的压力辅助 App。 它不会替你定义情绪,也不会要求你必须积极。 它只是帮你更早看见自己的状态。 看见那些被你忽略的压力 连接 Apple Watch 后,Stresscan 会根据 HRV 数据,辅助呈现当前压力状态: 优秀 · 正常 · 注意 · 过载 你可以在首页快速查看当下状态和一天中的压力变化。 有时候,我们不是不知道自己累。 只是直到身体开始抗议,才终于承认自己已经撑了很久。 回到情绪发生变化的那一刻 你可以查看每日压力曲线,拖动时间标尺,回到某一个具体时刻。 那时候你正在工作、通勤,还是刚结束一段对话? 你可以记录当时的心情和发生的事情,慢慢找到真正让自己紧绷的来源。 不是为了分析得多么专业。 只是帮助你更了解自己。 Alex 会听你说话 你可以直接和 Alex 对话,告诉它今天过得怎么样。 也可以拍下一张照片,分享眼前的晚霞、凌乱的桌面、回家的路,或者任何你想记录的时刻。 它不一定能解决所有问题。 但当你想说点什么时,它会认真回应你。 支持中文与 English,也可以设置属于你的称呼和 Alex 的陪伴方式。 压力上来时,先不用逼自己振作 当你感觉紧绷或压力过高时,可以打开减压工具: 解压捏捏乐 寻找身边的颜色 井字棋 体感画圆 不需要完成一整套课程。 也不需要马上变得开心。 只是先给自己几分钟,从压力里稍微退出来一点。 白天是粉色,夜晚是霓虹绿色 你可以自由切换日间和夜间模式。 白天柔和清晰,夜晚安静沉浸。 无论什么时候打开,Alex 都还在那里。 你的数据,只属于你 HRV、压力曲线与生命体征记录仅保存在本机。 无需账号,不上传,不追踪。 因为你的身体状态、情绪和生活,不应该成为被随意收集的数据。 我们总是很会照顾别人,却常常最后才想起自己。 所以这一次,不需要等谁来发现。 你也可以拥有一个属于自己的系统,提醒你: “今天已经做得很好了,剩下的明天再说。” 祝你在地球 Online,玩的开心,过得愉快。 —— Alex × Stresscan

Screenshots

Cafactor4 screens
Stresscan4 screens

Verdict

The call

The clearest difference is in-app purchases: Stresscan at none against Cafactor's 1. Cafactor's advantage is update cadence (weekly vs every 3 weeks). On price, ads, device support and iOS requirement 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. Cafactor sells 1 one-off in-app purchase. Stresscan asks for nothing beyond the download.

UpkeepUpdate frequency

Cafactor ships an update weekly, Stresscan every 3 weeks. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
Cafactor versus Stresscan: the parameters behind the verdict, then further details
ParameterCafactorStresscan
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyWeekly — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, Apple Watch
Requires iOS17.617.0 — better
Further details — not scored
Size9 MB40 MB
Age rating4+9+
DeveloperNan Yu伊璠 董

In-app purchases

1 purchases

Cafactor

One-time1
  • Cafactor Pro$3.99
None

Stresscan

No in-app purchases

Questions

Is Cafactor free?
Cafactor is free to download, with in-app purchases available.
Is Stresscan free?
Stresscan is free to download, with no in-app purchases.
Do Cafactor or Stresscan have ads?
Neither Cafactor nor Stresscan shows ads.
Which is updated more often, Cafactor or Stresscan?
Cafactor ships an update weekly, and Stresscan every 3 weeks. Most recently, Cafactor was updated on November 5, 2026 and Stresscan on October 31, 2026.

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