Best Apps to Track Your Resting Heart Rate
App guide
Ranked & compared
Fitbit/Google Health provides the most automatic and continuous resting-HR trend data on wearable users; Welltory adds HRV and stress layering via phone camera or wearable; Cardiogram aggregates across multiple devices — but Welltory's subscription price is unverified, so check in-app before committing.
Resting heart rate is a passive cardiovascular health marker that can shift meaningfully during GLP-1 therapy. Wearable-based apps like Fitbit and Cardiogram capture resting HR automatically during sleep, while camera-based apps like Welltory provide spot measurements without hardware investment. This guide compares the three best apps for tracking resting heart rate, explains what changes to watch for on GLP-1 medication, and helps you choose the right tool for your monitoring needs.
This is general nutrition and wellness information, not medical advice. If you're on a weight-loss medication or managing a health condition, confirm specifics with your clinician.
What you're actually tracking
Resting heart rate is a passive cardiovascular health marker — lower is generally better, but rapid drops or unexpected rises during GLP-1 therapy can signal dehydration, electrolyte imbalance, or over-adaptation to caloric restriction. Wearable-based apps (Fitbit, Cardiogram) capture resting HR automatically during sleep; camera-based apps (Welltory) provide spot measurements without hardware investment.
How we evaluated them
Evaluated on: measurement method (automatic wearable vs. spot camera-based); HR trend depth (30/90-day view); HRV availability; platform compatibility; price transparency; and specific relevance to GLP-1 users whose cardiovascular parameters may shift during rapid weight loss.
The apps, side by side
No single app wins for everyone — each card calls out who it's genuinely best for, so you can pick on fit, not hype.
Fitbit / Google Health
Free / Premium $9.99/mo or $79.99/yriOS / AndroidBest for: Automatic resting-HR trends from a wearable
- 30/90-day resting-HR and HRV trends available free
- Broad Fitbit/Pixel Watch ecosystem
- Requires a Fitbit or Pixel Watch for continuous HR data
Welltory
Free tier (1 measurement/day) / paid subscription UNVERIFIED (not published on official pages)iOS / Android / WebBest for: HRV and resting-heart-rate measurement via phone camera or wearable
- Camera-based HRV measurement — no wearable required
- Stress and energy insights alongside HR
- Subscription price not published on official pages
- Deeper metrics gated behind paid tier
Cardiogram
Free 30-day trial / Heart IQ from about $6.99/mo (annual tiers ~$24.99–$49.99)iOS / AndroidBest for: Resting-HR logging from multiple wearable brands
- Works with Apple Watch, Fitbit, Garmin, Wear OS
- Consolidated HR trend across devices
- Subscription required for full Heart IQ features
What Resting Heart Rate Actually Tells You on GLP-1 Medication
Resting heart rate is the number of times your heart beats per minute when you're completely at rest — ideally measured first thing in the morning or during sleep. The clinical normal range is 60 to 100 beats per minute, though well-conditioned athletes often sit between 40 and 60 bpm without any cause for concern.
On GLP-1 medications like semaglutide or tirzepatide, resting heart rate can shift in both directions. Weight loss itself tends to improve cardiovascular fitness, which typically lowers resting HR over time. A sustained drop of 5 to 10 bpm over 4 to 8 weeks is usually a positive signal — your heart is working more efficiently as body mass decreases and metabolic health improves.
But GLP-1 therapy also introduces variables that can push resting HR in the opposite direction. Nausea and reduced appetite often lead to lower fluid intake, and dehydration forces the heart to beat faster to maintain cardiac output with reduced blood volume. This compensatory tachycardia can show up as a resting HR creeping upward by 5 to 8 bpm over several days — a pattern worth catching early.
Electrolyte imbalances from reduced food intake can also affect heart rate. When you're eating less overall, sodium and potassium intake may drop below what your body needs for normal cardiac rhythm. The combination of dehydration and electrolyte shifts is the most common reason GLP-1 users see unexpected resting HR increases. Tracking your resting HR daily gives you a passive early-warning system for both problems before they become symptomatic.
Bottom line
A sustained resting HR drop of 5–10 bpm over 4–8 weeks on GLP-1 is usually a positive fitness signal; a sudden spike of 10+ bpm is worth flagging — it may indicate dehydration, which GLP-1 nausea makes easy to develop.
The 3 Best Apps for Tracking Resting Heart Rate
We evaluated the leading resting heart rate tracking apps based on measurement method, trend depth, HRV availability, platform compatibility, and price transparency. Each app takes a different approach, so the best choice depends on whether you already own a wearable device and what additional metrics you want to track alongside resting HR.
Fitbit, now integrated into Google Health, offers the most seamless automatic tracking for anyone with a Fitbit device or Pixel Watch. The free tier includes 30-day and 90-day resting heart rate trend views, plus basic HRV tracking during sleep. You don't need the Premium subscription for core resting HR data — that $9.99 monthly tier adds deeper sleep analysis and readiness scores, but the cardiovascular basics remain free. The main limitation is hardware: you need a Fitbit or Pixel Watch, and continuous optical heart rate monitoring works best when the device is worn snugly during sleep.
Welltory takes a fundamentally different approach by using your phone's camera to measure heart rate and heart rate variability. Place your finger over the camera lens, and the app detects subtle changes in light absorption with each pulse — the same photoplethysmography principle wearables use, but in a spot-check format. The free tier gives you one measurement per day, which is enough to establish a resting HR baseline over time if you're consistent about measuring at the same time each morning. The paid tier unlocks unlimited measurements and deeper stress and energy analytics, but the subscription price was not published on Welltory's official website or app store listings at research time — you'll need to download the app and check current pricing before committing.
Cardiogram solves a different problem: it aggregates heart rate data from multiple wearable brands into a single dashboard. If you've switched from a Fitbit to an Apple Watch, or use a Garmin for workouts but want consolidated resting HR trends, Cardiogram pulls data from all of them. The free 30-day trial gives you full access to Heart IQ, Cardiogram's pattern-recognition feature that flags unusual heart rate patterns. After the trial, Heart IQ requires a subscription starting around $6.99 monthly, with annual tiers ranging from roughly $24.99 to $49.99 depending on features. The cross-device compatibility is Cardiogram's standout strength — no other app in this space aggregates resting HR data across Apple Watch, Fitbit, Garmin, and Wear OS devices.
- Fitbit/Google Health: Best for automatic sleep-based resting HR trends with a wearable
- Welltory: Best for wearable-free HRV and resting HR via phone camera
- Cardiogram: Best for aggregating resting HR data across multiple wearable brands
Bottom line
Fitbit/Google Health is the strongest choice if you already own a Fitbit or Pixel Watch — 30/90-day resting-HR trends are free; Welltory is the best wearable-free option, but verify subscription pricing in-app before committing.
HRV vs. Resting HR: Which Is More Useful for GLP-1 Users?
Heart rate variability (HRV) measures the millisecond-level variation in time between consecutive heartbeats. Unlike resting heart rate, which is a simple beats-per-minute count, HRV reflects the balance between your sympathetic nervous system (fight-or-flight) and parasympathetic nervous system (rest-and-digest). Higher HRV generally indicates better recovery, lower stress, and greater cardiovascular adaptability.
For GLP-1 users, HRV adds a layer of information that resting HR alone misses. Rapid weight loss is a physiological stressor — your body is mobilizing stored fat, adapting to a significant caloric deficit, and recalibrating hormone levels. HRV tends to dip during periods of high stress or inadequate recovery, even when resting HR stays stable. If you're combining GLP-1 therapy with a new exercise program, tracking HRV alongside resting HR can help you distinguish between positive cardiovascular adaptation (resting HR dropping, HRV rising) and overtraining or under-recovery (resting HR stable or rising, HRV dropping).
Welltory makes HRV its primary metric, which is why the app emphasizes stress and energy scores rather than just heart rate. Fitbit includes sleep-based HRV in its free tier, and Cardiogram's Heart IQ feature analyzes HRV patterns across your aggregated device data. For most GLP-1 users focused purely on cardiovascular health monitoring, resting HR alone is sufficient — it's simpler to interpret and directly actionable. But if you're training regularly, managing high stress, or want the earliest possible signal of overtraining, adding HRV tracking provides meaningful additional context.
Bottom line
HRV adds recovery signal that resting HR misses — useful for people combining GLP-1 with a training program; resting HR alone is sufficient for basic cardiovascular health monitoring.
How Dehydration From GLP-1 Side Effects Affects Heart Rate
Dehydration is one of the most underappreciated side effects of GLP-1 medications. Nausea and vomiting are well-known, but the subtler effect is reduced thirst — GLP-1 receptor agonists act on the hypothalamus, which regulates both appetite and thirst. Many users simply don't feel thirsty even when their fluid intake has dropped significantly below what their body needs.
When you're dehydrated, your blood volume decreases. The heart compensates by beating faster to maintain adequate cardiac output — a phenomenon called compensatory tachycardia. This can show up in your resting heart rate data as a gradual increase of 5 to 10 bpm over several days, often before you notice any symptoms like dry mouth, headache, or dark urine. Clinical guidance for GLP-1 users recommends more than 2 to 3 liters of fluid per day, which is higher than the standard recommendation because of the increased dehydration risk from reduced intake and potential gastrointestinal losses.
Daily resting HR tracking gives you a passive hydration check. If your resting HR is trending upward and you can't attribute it to increased stress, poor sleep, or a new training stimulus, dehydration is the most likely culprit on GLP-1 therapy. The fix is straightforward — increase fluid intake over the next 24 to 48 hours and watch whether resting HR returns to baseline. If it doesn't, or if you're also experiencing dizziness, rapid heartbeat when standing, or significantly reduced urine output, contact your prescriber.
Bottom line
A resting HR creeping up 5–8 bpm over several days while on GLP-1 is a common sign of developing dehydration — check fluid intake (target more than 2–3 L/day per clinical guidance) before attributing it to anything else.
Setting Up Resting HR Alerts and Thresholds in Your App
Most resting heart rate apps include alert features, but they're often buried in settings menus and not enabled by default. Taking five minutes to configure personalized thresholds turns passive tracking into an active safety net — especially important when you're on a medication that can affect cardiovascular parameters.
In Fitbit, navigate to the Heart Health settings and enable abnormal heart rate notifications. Fitbit's default high-alert threshold is 100 bpm, which is a reasonable minimum safety net for most adults. You can also set a low-alert threshold, though this is less commonly triggered unless you're an endurance athlete with a naturally low resting HR. The key is consistency: wear your device during sleep so resting HR is calculated from your lowest overnight readings rather than daytime values that include movement and stress artifacts.
Cardiogram's Heart IQ feature goes a step further by learning your personal baseline and flagging deviations from your normal pattern rather than using fixed thresholds. This is more personalized but requires a subscription after the 30-day trial. Welltory doesn't offer automatic alerts in the same way — it's a spot-check tool — so the best approach is to set a daily phone reminder to take your morning measurement at the same time, then review your weekly trend manually.
As a general rule, contact your prescriber if your resting HR rises 15 or more bpm above your personal baseline without an obvious explanation like illness, a new medication, or a dramatic change in training load. A sustained resting HR above 100 bpm at rest also warrants a conversation, regardless of whether you're on GLP-1 therapy.
Bottom line
Set your resting HR alert at 100+ bpm in Fitbit or Cardiogram as a minimum safety net; consult your prescriber if resting HR rises 15+ bpm from your personal baseline without an obvious training explanation.
What most pages leave out
Wearable-based resting HR (measured during sleep) is more accurate than spot-check camera measurements, but neither matches a clinical ECG. Welltory's subscription price was not confirmed from the official site or app stores at research time and is marked UNVERIFIED — check current pricing in the app before subscribing. Competitors rarely flag this pricing uncertainty.
We flag this so you can make an informed choice — not to scare you off.
❓Frequently Asked Questions
Fitbit/Google Health is best for automatic 30-day and 90-day resting HR trends if you own a Fitbit or Pixel Watch. Welltory is the best wearable-free option, using your phone camera for daily HRV and heart rate measurements. Cardiogram is ideal if you use multiple wearable brands and want consolidated resting HR data in one dashboard.
Yes — GLP-1 medications can affect resting heart rate in both directions. Weight loss typically improves cardiovascular fitness and lowers resting HR over time, which is a positive adaptation. However, dehydration from GLP-1-related nausea or reduced fluid intake can temporarily raise resting HR by 5 to 10 bpm.
The clinical normal range for resting heart rate is 60 to 100 beats per minute for most adults. Well-conditioned athletes often have resting heart rates between 40 and 60 bpm. A resting HR consistently below 40 or above 100 bpm warrants a conversation with your healthcare provider.
Yes — Fitbit's free tier includes 30-day and 90-day resting heart rate trend views on compatible devices, plus basic sleep-based HRV tracking. The Premium tier at $9.99 per month or $79.99 per year adds deeper sleep analysis and readiness scores, but is not required for core resting HR monitoring.
Heart rate variability (HRV) measures the millisecond variation between consecutive heartbeats and reflects the balance between your stress and recovery systems. Higher HRV generally indicates better recovery and lower stress. Tracking HRV alongside resting HR is useful if you're combining GLP-1 therapy with regular exercise, but resting HR alone is sufficient for basic cardiovascular monitoring.
Yes — Welltory uses your smartphone camera to measure heart rate and HRV by detecting pulse-related changes in light absorption when you place a finger over the lens. The free tier provides one measurement per day, which is enough to establish a resting HR baseline if you measure consistently at the same time each morning.
Dehydration reduces blood volume, which forces the heart to beat faster to maintain adequate cardiac output — a response called compensatory tachycardia. On GLP-1 therapy, a resting HR creeping up 5 to 10 bpm over several days often signals insufficient fluid intake, especially since GLP-1 medications can reduce thirst sensation.
Welltory offers a free tier that includes one heart rate and HRV measurement per day using your phone's camera. The paid subscription unlocks unlimited measurements and deeper analytics, but the subscription price was not confirmed from official pages at research time — check current pricing in the app before subscribing.
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