Hello Inside vs Caelyn
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Hello Inside
This app offers a holistic approach to women's metabolism and well-being, utilizing continuous glucose monitoring (CGM) to provide insights into hormonal imbalances. It helps manage symptoms related to PMS, menopause, and other hormone disorders through personalized recommendations and educational programs.
- Continuous glucose monitoring (CGM) integration
- Insights into female metabolism and hormonal imbalances
- Personalized recommendations for PMS and menopause
- Blood sugar monitoring and stabilization
- Educational programs on hormones and menopause
- Activity and journaling for tracking habits
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The first holistic coaching solution for your metabolism and well-being! Navigate menopause with ease, alleviate PMS symptoms, or reach your health goals using continuous glucose monitoring (CGM). WE TAKE WOMEN’S HEALTH TO THE NEXT LEVEL Gain access to blood sugar data through our continuous glucose monitoring (CGM) and get insights into the female metabolism through the app. We analyze your glucose data and provide valuable insights and recommendations on hormonal imbalances related to PMS, menstrual pain, menopause, and other hormone disorders. METABOLIC HEALTH & GLUCOSE TRACKING Intelligent self-care starts with blood sugar monitoring. Your blood sugar is an important indicator of your health. By improving your diet and habits, you can stabilize your blood sugar levels, improve your energy levels, enhance your concentration, reduce cravings, control your weight, and prevent long-term illnesses. PROMOTING WOMEN’S HEALTH Specifically designed for women, “Hello Inside” understands the unique challenges that can occur during different phases of a woman’s life. Gain a deeper body awareness of your metabolism and learn to leverage hormones and blood sugar to your advantage. The health benefits of balanced blood sugar levels for women include reducing PMS and perimenopause symptoms such as period cramps, headaches, mood swings, bloating, and hot flashes. Our special learning programs “Hello Hormone,” “Hello Menopause,” “Hello Perimenopause,” and “Hello Sugar” await you with exciting content, recipes, and experiments. YOUR METABOLISM APP The Hello Inside app supports you on your journey to a healthier body with glucose tracking and great features including: * Initial Health Assessment and goal setting * Blood sugar programs with informative lessons and quiz questions * Recording activities (eating, sleeping, exercising, and stress) and journaling * Daily blood sugar statistics and weekly reports * Glucose experiments * Personal blood sugar reactions and expert recommendations for stabilizing your blood sugar * Programs created by experts on menopause and hormones By monitoring your blood sugar levels, you can understand how your body reacts to food, sleep, exercise, and stress. You will learn how your hormone balance affects your blood sugar and discover which foods are suitable for you. Improve your metabolism and well-being to reduce unpleasant symptoms, prevent diseases, and feel good every day. With your Hello Inside subscription and continuous glucose monitoring device (CGM), you can track how your habits and diet affect you. FROM NOW ON, NO ONE KNOWS YOUR BODY BETTER THAN YOU! Disclaimer: Your health is very important to us. ALWAYS consult your doctor about your self-care behavior. Hello Inside neither substitutes your doctor, nor is Hello Inside responsible for your behavior. The contents of the Hello Inside products, regardless of whether they are provided by Hello Inside, its partners or users, are not meant to supplement, let alone replace, the information provided by doctors or pharmacies. Terms & Conditions: https://helloinside.com/policies/terms-of-service Privacy Policy: https://helloinside.com/policies/privacy-policy
Caelyn
This period tracker learns your unique cycle patterns and keeps all your health data private on your device. It offers detailed insights into your cycle, symptoms, and mood, with robust privacy features and an optional Pro version for advanced analytics.
- Personalized cycle learning
- Detailed symptom and mood logging
- On-device data storage
- Privacy-focused design
- Cycle pattern insights
- Data export (CSV/PDF)
- Apple Health integration
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Your period, your patterns, your phone. Nothing leaves it. Caelyn is a period tracker that learns how your cycle actually works, then keeps everything it learns on your iPhone. There is no account to create and no server of ours holding your health data, because we do not run one. WHERE YOU ARE, EVERY DAY Open the app and you know. Cycle day, the phase you are in, and what is coming next. Your next period, your fertile window, and when PMS is likely to start. Log a period, a mood, a symptom, or nothing at all. Caelyn works with whatever you give it and gets sharper the more you log. Track flow, pain and where it hurts, mood, energy, basal temperature, cervical mucus, ovulation and pregnancy tests, medication, and a private note for anything that does not fit a box. Eleven everyday symptoms are built in, and you can add your own. IT LEARNS YOU, NOT AN AVERAGE Most apps assume everyone ovulates fourteen days before their period. Caelyn watches your own logs and works out your real luteal length, your own PMS window, and the symptoms that tend to arrive before you bleed. After a couple of cycles it starts telling you things you would not spot yourself. Which symptoms show up in which phase. When your energy dips. Whether your cycle is steadier than you thought. Every one of those is worked out on your iPhone, from your data, and it shows you the numbers behind it. IS THIS NORMAL The question everyone actually has. Caelyn answers it with your cycle length, your period length, and your pain against the ranges most people fall into, and it says plainly when something is worth a conversation with a doctor. No judgement, no scare tactics. BUILT SO YOUR DATA CANNOT LEAK Every entry lives in a private database on your iPhone. Caelyn makes no network calls of its own. It has no analytics, no advertising, no third party trackers, and nothing to sell. Lock it behind Face ID or a PIN. Hide the app in the switcher so a glance shows nothing. Turn on private notifications so your lock screen never spells out your cycle. Set a duress PIN that quietly erases everything if you ever need it to. This is not a promise about how we behave. It is how the app is built. There is nothing for anyone to hand over, including us. WHEN YOU NEED TO SHOW SOMEONE Export a CSV whenever you like, and keep it wherever you want. Caelyn Pro adds a clear PDF of your history for an appointment, so you walk in with dates and patterns instead of trying to remember. FREE, AND GENEROUS ABOUT IT Unlimited logging, full predictions, the calendar, reminders, five pattern insights, six months of your year in review, a home screen widget, Apple Health, app lock, and CSV export are all free. They stay free. CAELYN PRO Every pattern Caelyn finds instead of the first five. Charts for cycle length, period length, symptoms, mood, pain and temperature. A full twelve months in review. A PDF for your doctor. Fertility tracking if you are trying to conceive, plus pregnancy and postpartum modes. Modes for PCOS, endometriosis and perimenopause. Your cycle on your Apple Watch and lock screen. Pro is 3.99 a month with a seven day free trial, or 19.99 a year. You can also pay once and own it forever. Whichever you pick, the privacy is identical. We charge for depth of analysis, never for keeping your data safe. A NOTE ON WHAT THIS IS Caelyn is a personal cycle tracker, not a medical device. Predictions are estimates based on what you log, and they will sometimes be wrong. It should not be used as contraception. For anything that worries you, please talk to a doctor or nurse. Made for anyone who wants to understand their body without handing it over. Terms of Use: https://rajeshpanta.github.io/caelyn/terms.html Privacy Policy: https://rajeshpanta.github.io/caelyn/privacy.html
Screenshots
Verdict
Hello Inside and Caelyn both sit at 5.0 stars, but that hides the real split: 100% of Caelyn's written reviews are positive against 63% of Hello Inside's. Caelyn also leads on update cadence (every 2 days vs every 4 days). Hello Inside's advantage is iOS requirement (15.0 vs 17.0). On price, rating, ratings volume and ads 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
Both are free to download. Hello Inside sells 2 in-app purchases, starting at $34.99 per month and Caelyn sells 3 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.
On the App Store both sit at effectively the same score — 5.0 for Hello Inside against 5.0 for Caelyn. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews are what separate them: 63% of Hello Inside's written reviews are positive against 100% of Caelyn's.
Hello Inside ships an update every 4 days, Caelyn every 2 days. The most recent releases landed on October 27, 2026 and October 24, 2026 respectively.
| Parameter | Hello Inside | Caelyn |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Positive reviews | 62.5% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 4 days | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 133 MB | 10 MB |
| Age rating | 4+ | 12+ |
| Developer | Hello Inside | Rajesh Panta |
Customer experience
Hello Inside
Caelyn
In-app purchases
Hello Inside
- App Only Monthly Subscription$34.991 Month
- App Only Yearly Subscription7 Days trial$174.991 Year
Caelyn
- Pro Monthly7 Days trial$3.991 Month
- Pro Yearly$19.991 Year
- Pro Lifetime$99.99









