Drift vs. Bevel, Gentler Streak and Century

In short: Drift is built for longevity: an eight-biomarker Longevity Score graded against age-adjusted thresholds from published research, a biological-age estimate, and a daily Drift Score that compares today with your own same-weekday baseline. Its machine-learning models are trained on your own data, on your iPhone, so it learns what’s normal for you and flags when you drift from it. It’s all in one subscription at US$49.99 a year, half the price of Bevel Pro (US$99.99), and US$5.99 a month against Gentler Streak’s US$8.99 and Century’s US$9.99. Ask Drift answers on your iPhone, not in the cloud, and there’s no account, no analytics and no tracking.

Drift is on the App Store as Drift: Longevity Health Coach (formerly Drift: Longevity Habits), for iPhone and Apple Watch.

Prices are US App Store prices checked on 17 October 2026. They change, and other storefronts differ. Facts about other apps come from their own websites, help centres, privacy policies and App Store listings.

At a glance

Drift vs. Bevel

Bevel is the broader app. Its free tier already covers recovery, sleep, strain and stress, and it adds food logging by photo or barcode, glucose from a CGM, a strength-training log, lab results, cycle tracking and blood pressure. It connects to Garmin, Oura and Fitbit directly as well as through Apple Health. If you want one app for everything, Bevel does more than Drift.

Where Drift differs:

• Longevity first. Drift’s Longevity Score grades eight biomarkers (VO₂ max, HRV, resting heart rate, sleep, steps, exercise, heart-rate recovery and walking speed) against age-adjusted thresholds from published research, and shows the weight and source of each. Bevel’s biological age is part of Pro.
• Your own baseline. The daily Drift Score compares today with your usual for the same weekday across sleep, activity, heart, mobility, environment, recovery and stress, rated Aligned, Drifting or Off Course, and 27 pattern detectors explain what changed.
• It learns you, on the device. Drift trains its own models on your Health data on your iPhone: anomaly detection that spots unusual days, clustering that learns your types of day, a forecast of where you’re drifting, and recommendations that adapt to what works for you. Bevel’s AI coach runs in the cloud.
• Price. Drift is US$49.99 a year; Bevel Pro, which includes its biological age and AI coach, is US$99.99.
• AI that stays on the phone. Ask Drift answers on your iPhone with Apple’s on-device model. Bevel’s AI coach uses cloud models from Google, Anthropic and OpenAI and sends them pseudonymised health data when it’s on.
• No account, no analytics. Bevel needs an account, uses Mixpanel, Singular and Google Analytics, and its App Store label lists identifiers as used to track you. Drift has none of these, and Stationify never receives your health data.

Drift vs. Gentler Streak

Gentler Streak won an Apple Design Award in 2024. It shows a daily Activity Path, a range that keeps you moving without overdoing it, and lets you mark yourself sick, injured or on a break without losing your streak. Its Apple Watch app records over 140 workout types, and it has a lifetime purchase. It has no account; it does use Mixpanel, Adjust and Sentry, with that data not linked to you.

Where Drift differs:

• Longevity measures. Drift has a Longevity Score and a biological-age estimate; Gentler Streak has neither.
• A score that knows your week. The Drift Score compares each day with your own previous same weekdays across seven categories, from models trained on your data on your iPhone, and shows Aligned, Drifting or Off Course.
• More to explore. 27 pattern detectors, a 14-night bedtime regularity challenge, and Sun Exposure.
• No analytics. Drift includes no analytics SDKs.
• Ask questions. Ask Drift explains why your score changed or what a pattern means, on the device.
• Price. Drift is US$5.99 a month; Gentler Streak is US$8.99. Gentler Streak’s lifetime option has no Drift equivalent.

Drift vs. Century

Century (formerly Century AI), made by Waldo Studio in Belgium, sells itself as a Whoop alternative for the watch you already wear. It turns wearable data into daily health, recovery, sleep and effort scores, adds a biological age it calls Century age, and has an opt-in community leaderboard. It runs on Android as well as iPhone and Apple Watch, and connects to Garmin, Fitbit and Strava directly.

Where Drift differs:

• No account. Century requires one and stores your calculated scores and history on its servers. Drift has no account, and Stationify never receives your health data.
• No analytics or tracking. Century uses PostHog analytics, and its App Store label lists usage data as used to track you. Drift has neither.
• Longevity you can check. Drift’s Longevity Score grades eight biomarkers against age-adjusted research thresholds and shows the weight and source of each. Century doesn’t publish how its Century age is worked out.
• A score that knows your week. The Drift Score compares today with your own previous same weekdays across seven categories, with 27 pattern detectors explaining what changed.
• It learns you, on the device. Drift trains its own models on your Health data on your iPhone. Century describes no models of its own.
• Ask questions. Ask Drift answers on your iPhone with Apple Intelligence. Century’s coach isn’t available in its current release.
• Price. Drift is US$5.99 a month; Century is US$9.99.

What Drift doesn’t do

To be fair about it:

• No free tier. Drift has a 7-day trial for eligible new subscribers, then a subscription. Bevel and Gentler Streak both have free tiers.
• No workout recording. Drift reads workouts from Apple Health; it doesn’t record them. Use the Workout app or a training app such as Kiito.
• No food, glucose or lab tracking. For those, Bevel goes further.
• No Android or iPad. Drift runs on iPhone and Apple Watch.
• Not a medical test. The biological-age estimate comes from fitness and lifestyle measures, not blood work, and Drift doesn’t diagnose anything.

Common questions