Mobile app development cost: why three quotes for the same app never match
Why quotes for the same app differ, what sits behind the screens, the store rules that add work nobody quoted, and why an app is a yearly cost.
Mayursinh Jadeja
Fitness app development company with the health data planned first
As a fitness app development company, we design and build iOS and Android apps for fitness brands, gym operators, equipment makers and employers’ wellness programs. We map every health data source and permission before the feature list, then build in stages with test builds on real phones.
- Health data sources mapped before the feature list
- Scope and cost agreed in discovery, before the build
- Test builds on real phones from the first stage
Reviewed by Mayursinh Jadeja, Founder · Last updated October 16, 2026
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Why fitness app development begins with where the data comes from
Fitness app development means designing and building a mobile app that records workouts, steps, heart rate, sleep or nutrition. That data arrives from the phone’s sensors, a watch or another app through Apple HealthKit or Android’s Health Connect, and those sources shape the build more than the screens do.
Each reading comes under a permission the user grants one data type at a time, and can withdraw. On iPhone, an app cannot tell a refused read from an empty history. On Android, Health Connect returns 30 days of earlier data unless the app asks for more. A dashboard built for full data shows zeros to users who said no.
So at Redlio Labs we map the data before the feature list. We settle which readings come from the phone, HealthKit, Health Connect or a wearable, and what each screen shows without them. Our step counter app for a consumer app company in Egypt read the phone’s own sensor, and discovery agreed its features, platform and cost first.
The rules on use are as exact. App Store Review Guideline 5.1.3 and Google Play’s health permissions policy keep health and fitness data out of advertising. The FTC’s Health Breach Notification Rule, amended in 2024, treats an unauthorized share as a breach. Our fitness app development services, part of our mobile app development work, plan for all three.
- The sourcesWe list every reading the app needs and where it comes from: the phone, HealthKit, Health Connect or a wearable.
- The permission momentsWe decide when the app asks for each data type, and what the user sees if the answer is no.
- The rules on useWe check every planned use of the data against Apple’s, Google’s and the FTC’s rules before the estimate.
Our health and fitness app development services
We offer six kinds of fitness and wellness app work, and a project can take any mix of them, from the tracking app to the backend behind it.
Custom fitness app development
We build iOS and Android fitness apps with the backend, subscriptions and admin tools behind them, so the product and its data stay under the client’s control.Fitness tracking app development
We build step, distance, workout and heart rate tracking from the phone’s own sensors, and from HealthKit or Health Connect where the user agrees to share.Workout and coaching app development
We build workout plans, guided sessions and trainer messaging, with each user’s progress kept in one record the coach can see.Wellness app development
We build sleep, mindfulness, nutrition and workplace wellness apps, with the same care over what each user agrees to share.HealthKit, Health Connect and wearables
We connect the app to Apple HealthKit, Android’s Health Connect or a wearable maker’s API, one data type at a time, with a plan for each refusal.Fitness app design
We design the screens for a user in the middle of a workout, and for the user who shares no data at all.
Fitness app development case studies
Client projects are told from the client’s own review. Design work is shown as work, with no client result claimed.
Client project
Android step counter app development, scoped and priced before the build
A step counter that runs on the phone’s own sensor, scoped in discovery and built for Android first.
4.7on Google Play after 20,000 installs, by the client’s account
Design work
Fitness website design and branding for a gym and coaching company
A website and identity for a gym, carried on to a building sign and packaging.
Reviews from clients we have designed and built for
Saurabh GoswamiManaging Director, Ultra Rich Weddings 5/5★★★★★“Redlio Labs successfully delivered the project within schedule; they met all of our requirements. Their quality designs and in-depth knowledge of technology were key elements of their work.”
Verified review on Clutch
1 / 4
A scoping call with the fitness app developers who would build the app
Thirty minutes on the readings the app needs, where each one comes from and the platforms it launches on, ahead of any proposal. Every inquiry gets an answer within 12 hours and an NDA ahead of the call, then a plain view on whether we are the right team.
Mayursinh JadejaFounder
Request a scoping call
- Reply within 12 hours
- NDA before the first call
- A straight answer on fit
Where a fitness app’s data comes from, and what each source asks of the build
We compare four sources before the feature list. Each brings its own permission, its own limit on past data and its own way of failing when a user declines.
| The phone’s own sensors | Apple HealthKit | Android Health Connect | A wearable maker’s API | |
|---|---|---|---|---|
| What it provides | Steps and motion counted by the phone itself | Readings the user keeps in the Health app, from the iPhone, a watch and other apps | Readings that other Android apps and devices have written to Health Connect | Data from that maker’s devices, through its own service |
| Permission | Activity recognition on Android, Motion and Fitness on iPhone | Read and share, granted per data type | Read and write per data type, with separate permissions for history and background reads | An account link the user approves, on the maker’s terms |
| When the user declines | No count, so the app needs a screen that explains why | The app is not told: a refused read looks like no data | The app should keep running on whatever the user granted, as Android advises | No link, so that device’s data never arrives |
| Past data | Only what the app recorded itself | Full history, or a recent window the user picks | 30 days before the first grant, unless history access is granted | Whatever the maker’s API returns |
| The real risk | Counts lost on a restart, and battery drain from frequent reads | Dashboards that show zeros to users who declined | Features that assume more history than the app may read | A dependency on one maker’s terms and its service staying up |
When an app draws on more than one source, each adds permission screens, test cases and store review questions, so we fix the mix in discovery. The Android sensor rules are set out on our step counter case study.
Before the feature list
Six fitness app decisions we settle before design
Each takes an hour to agree at the start and weeks to unpick once users have granted, or refused, their permissions. We agree them with the client’s team and write them into the scope.
Data sources
We decide which readings come from the phone, HealthKit, Health Connect or a wearable, so the scope and the test plan cover each one.Permission moments
We ask for each data type when the feature that needs it first opens, not all at install, as Apple’s HealthKit guidance suggests.Empty and partial data
We design every screen for a user who shares nothing, shares some types or shares only recent history, so nobody meets a broken dashboard.Where the data lives
We agree which readings leave the phone, where the backend keeps them and for how long, and keep personal health data out of iCloud, as Apple requires.Who else sees it
We list every party that sees a user’s data, such as a coach, an employer’s wellness program or an analytics tool, and what each may see.Claims on screen
We word each metric as what it is, a fitness estimate or a measured value, because Apple reviews accuracy claims on health measurements.
What a fitness app must settle about health data on iOS and Android
Each point comes from Apple’s, Google’s or the FTC’s own documents, read on October 16, 2026. They apply whoever builds the app, so we advise putting each one to any supplier before the estimate.
- HealthKit and Health Connect grant access one data type at a time, reading and writing separately, so each feature that touches steps, heart rate or sleep adds a permission (HealthKit, Health Connect)
- On iPhone an app is not told whether a user refused to share data or has none, and a user can share only a recent window of history (Apple)
- Health Connect lets an app read 30 days of data from before the user first granted access; older records and reads in the background each need a further permission (Android)
- App Store Review Guideline 5.1.3 bars data from HealthKit and Motion and Fitness from advertising, marketing and data mining, and the app must disclose the health data it collects (Apple)
- The same guideline bars storing personal health information in iCloud and writing false or inaccurate data into HealthKit, which settles part of the backend design (Apple)
- Google Play bars selling health and fitness data, using it to serve ads, and using it to decide credit, insurance, employment or lending (Play Console Help)
- Apple rejects an app that cannot support the accuracy of a health measurement, and does not permit blood pressure or blood oxygen readings from the phone’s sensors alone (guideline 1.4.1)
- The FTC’s Health Breach Notification Rule, amended in 2024, covers health apps outside HIPAA: a share without the user’s authorization is a breach, with notice due within 60 days (FTC)
We work through all eight in discovery and write the answers into the scope, so the estimate already carries them.
When fitness app development is the wrong choice
Three cases where we advise a different route:
A white-label app does the job
Where members need a class timetable, bookings and payments, we advise a white-label gym app or booking platform, branded and configured. It is quicker to launch, and its vendor keeps it current with each operating system release. Build vs buy software sets out where that line falls.The plan depends on selling the data
Where the revenue plan rests on advertising against health data or selling it, we advise changing the plan before the build. Apple’s and Google’s rules bar that use, and both stores review apps against them.The app diagnoses or treats
An app meant to diagnose, treat or manage a condition is a healthcare build with its own regulators, and a fitness plan will not cover it. Our healthcare software development page covers that work.
Fitness app development is the right choice where the app’s value is the user’s own activity data, used for that user’s benefit, in a product the company owns.
Our fitness app development process
Step 1 of 5
Discovery
We map your workflows, systems, and constraints with the people who use them every day, before anything is scoped. For a fitness app: we list every reading the app needs, the source of each and the moment the user is asked to share it.
Discovery
- Workflow map
- Systems inventory
- Constraints and risks
Step 2 of 5
Scope and plan
We write a scope, a timeline, and a price for that scope. Architecture decisions are made and documented before code starts. We write down the platforms, the data sources and the screens for users who share nothing, and price the build against them.
Scope and plan
- Written scope
- Timeline and milestones
- A price for that scope
- Architecture decisions
Step 3 of 5
Build in stages
Senior engineers deliver in planned stages, with working software demonstrated at every step, not a reveal at the end. Test builds go to real phones from the first stage, including accounts that share no health data at all.
Build in stages
- Planned stages
- Working software every step
- Senior engineers on the code
Step 4 of 5
Launch
Data migration, training, and a production cutover planned around your operations and your calendar, not ours. We prepare the health data disclosures each store asks for, and check every on-screen claim against Apple’s accuracy rule before review.
Launch
- Data migration
- Team training
- Production cutover
Step 5 of 5
Run and improve
The team that built your system stays on it: monitoring, support, and the next improvements on one roadmap. We recheck the permissions and policies when Apple and Google change them, and plan each change before a deadline forces it.
Run and improve
- Monitoring
- Support
- Improvement roadmap
Why companies choose Redlio Labs as their fitness app development company
The data map first
We settle where each reading comes from and what the app does without it, before the screens, so the scope holds once users start saying no.Scope and cost agreed in discovery
We agree the features, the platforms and the price before the build. Our Android step counter, scoped that way, holds a 4.7 Google Play rating from its first 20,000 installs, in its client’s words.Design and build from one team
We design the screens and build the app with the same people. Our fitness design work also includes a gym and coaching website.A straight answer on data use
If a plan for the data would not pass Apple’s or Google’s rules, we say so in the first call, before any estimate exists.
Guides to read before commissioning a fitness app
Build vs buy software is decided where the two meet
Is it better, or cheaper, to build or buy? The statistic the debate leans on, traced to its source. Then who publishes the advice, a real project that went custom, the boundary no comparison prices, and what it costs to change your mind.
Mayursinh Jadeja
How to choose a software development company, as one client did
What one client who interviewed fifteen vendors chose on, why the usual checklist could not separate them, the three tests that can, and the eight questions to send every vendor in writing.
Mayursinh Jadeja
Fitness app development FAQs
If something here does not answer it, ask the founder directly.
Talk to the people who do the work
A 30 minute scoping call with the team that would take the project on. We reply within 12 hours.
Prefer email?info@redliolabs.com
What is fitness app development?
Fitness app development is the work of designing, building and releasing an app that helps people train, move, sleep or eat better, with its backend. It differs from other app work in one way: the app handles health data that the user, Apple and Google each control. We plan that data before the screens.
How do you create a fitness app?
We create a fitness app in five stages: discovery on who uses it and what it measures, a written scope with every data source and permission, design tested on real phones, a build in stages with test builds, then the store release and the updates after it. The data sources come first because they decide most of the cost.
How much does fitness app development cost?
We price fitness app development against a written scope, so no figure is honest before scoping. The data sources, the platforms, the backend and the links to watches and other apps move the price most, and the screen count moves it least. Mobile app development cost shows what to compare across quotes for the same scope.
How long does it take to build a fitness app?
We set the timeline in discovery, once the platforms and the data sources are fixed, because those decide it more than the screen count. Launching on one platform first keeps the first release smaller, as with our step counter app, built for Android first. The cost guide sets out how long each stage of an app takes.
Can a fitness app read data from Apple Health and Health Connect?
Yes, a fitness app can read from and write to Apple HealthKit and Android’s Health Connect, one data type at a time and only with the user’s permission. On iPhone the app is not told when a user refuses, and on Android it reads 30 days of earlier data by default. We design every screen for both cases.
Do fitness apps need to comply with HIPAA?
A consumer fitness app may fall outside HIPAA, but the FTC’s Health Breach Notification Rule is written for those health apps. Since July 29, 2024, it treats an unauthorized share of health data as a breach, with notice due within 60 days. For an app built for a hospital, clinic or health plan, see our healthcare software development page.
Are you a fitness app development company in India?
Yes, our designers and engineers work from Ahmedabad, India. We take on fitness app work from clients at home and overseas, such as the step counter app built for a company in Egypt. The people on the scoping call are the people who build the app, wherever the client is.
Do you build wellness apps too?
Yes, we build wellness apps for sleep, mindfulness, nutrition and workplace wellness programs alongside fitness apps, and plan their data the same way. Where a wellness app starts to diagnose or treat a condition, it becomes a healthcare build with its own rules, and we say so before scoping.
How do I choose a fitness app development company?
We advise choosing the company that can say, before it estimates, where each reading comes from and what the app shows a user who shares nothing. The eight health data points above are a fair test to put to any supplier. Our guide on choosing a software development company adds the checks that apply to any build.
Request a scoping call on your fitness app and the health data behind it
Half an hour with the designers and engineers on the build team. We ask what the app tracks, where each reading comes from and who else sees it. A reply follows inside 12 hours, the NDA comes before we talk, and the answer on fit is an honest one.
- We reply within 12 hours
- You talk to the people doing the work, never an account manager
- Peer-reviewed releases
- NDA before your first call
Mayursinh Jadeja
Founder, Redlio Labs