Best Function Apps

226+ iOS apps curated and reviewed

4.6 avg rating

18 free apps

Updated July 2026

Whether you're new to function or looking for an upgrade, our curated collection of 226+ iOS apps has something for everyone. Each app is reviewed and rated by real users, helping you make an informed decision.

Top Picks for Function

#1

Function Health by Function Health, Inc.

Own Your Health

Editor's Choice

💪 Health & Fitness

4.9😊(23K ratings)

Free

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Take control of your health with comprehensive lab testing, personalized protocols, and AI-powered insights. Understand your body's data, track changes over time, and make informed decisions for long-term wellness. Connect wearables and upload records for a complete health picture.

What We Love

🚀 Seamless process for blood tests and results
📊 Comprehensive health insights and tracking
🧠 Helpful clinician notes and recommendations
👍 User-friendly and visually appealing app

Room to Improve

🔍 Lack of communication and support responsiveness
🐛 Some bugs and usability issues in the app

#2

Desmos Graphing Calculator by Desmos, Inc.

Strong Contender

📚 Education

4.3😊(1.3K ratings)

Free

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Explore mathematical concepts by graphing any equation, from simple lines to complex series. This powerful tool allows for interactive exploration with sliders, data tables, and animations. It also includes a scientific calculator and supports inequalities and accessibility features.

What We Love

🚀 Insane tool for FREE!
🚀 Best mobile graphing app
👍 Awesome for algebra and calculus
👍 Genuinely an awesome resource

Room to Improve

🐛 Crashes and bugs
🐛 Glitches with certain features
🐛 Loses saved data

#3

Function by Kolej Technologies, Inc.

Your wedding, simplified.

Worth Considering

🌟 Lifestyle

0.0(0 ratings)

Free

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More Function apps to explore

Audio Function Generator

Audio Function Generator

Frequency and Signal Generator

Generate various audio test tones, including sine, square, triangle, and sawtooth waves. Explore frequency and volume sweeps, noise generation, and custom preset creation. Advanced features like extended frequency ranges and multi-tone playback are available with an upgrade.

Generate sine, square, triangle, and sawtooth tonesFrequency and volume sweep generationNoise generation (white, pink, violet, etc.)

free with in-app purchases

GeoGebra Graphing Calculator

GeoGebra Graphing Calculator

Graph, Drag, Share

This application allows users to easily graph functions and equations, identify key points, and share their work. It's a powerful tool for learning math and science, offering features like regression and access to learning activities.

Graph functions, polar and parametric curvesInteractive transformations with slidersFind special function points (roots, min, max, intersections)

GeoGebra Calculator Suite

GeoGebra Calculator Suite

Graph, construct, create

Explore mathematical concepts with a powerful suite of tools. Graph functions, solve equations, and construct geometric figures in 2D and 3D. Utilize augmented reality to visualize math in the real world and share your creations.

Graph functions, equations, curves, and surfaces in 2D and 3DSolve equations and perform calculus operationsConstruct and analyze geometric figures

Function Studios

Function Studios

Fitness & Wellness

Browse and purchase fitness class packs and memberships. View the class schedule, filter by type, and book reservations. Manage your upcoming classes to stay organized and committed to your fitness goals.

Purchase class packs and membershipsView class scheduleFilter classes by type

💪 Health & Fitness

free with in-app purchases

Fossil Smartwatches

Fossil Smartwatches

Function, Fossil Style

This companion app syncs with Fossil smartwatches to track fitness, sleep, and receive notifications. It allows users to control music, check commute times, and customize watch faces and shortcuts for personalized functionality.

Fitness and sleep trackingReceive app and contact alertsSmartwatch remote control

Learn math, step-by-step

Scan any math problem to receive instant, step-by-step explanations and accurate solutions. This app breaks down complex problems into manageable steps, helping users understand the 'how' and 'why' of math. It supports a wide range of math topics, from basic arithmetic to advanced calculus.

Scan math problemsStep-by-step explanationsWord problem solver

free with in-app purchases

FormulizeIT - Custom function calculator

FormulizeIT - Custom function calculator

by Xiamen Auro Information Technology Co., Ltd

Create, save, and reuse complex custom formulas for calculations on your mobile device. Easily input variables and access your saved formulas for quick and efficient computation.

Create and edit custom formulasSave formulas for later useSet default values for variables

MathMaster: Math Solver & Help

MathMaster: Math Solver & Help

Homework Helper & AI Tutor

Solve math problems instantly by taking a photo or entering an equation. Get step-by-step solutions to understand the process and improve your math skills. Covers a wide range of topics from basic arithmetic to calculus.

Camera-based problem solvingStep-by-step solutionsHandwritten and printed math recognition

free with in-app purchases

Fun & Functional

Fun & Functional

Learn the function of objects

This app teaches users to understand and describe the function of everyday objects. It's designed for children and adults, offering a research-based curriculum to build vocabulary and literacy skills. Features include dual-mode learning, high-quality visuals, and multilingual support.

Teaches object functionDual-mode learning (receptive/expressive)Over 20,000 visuals

GSM+ Second Phone Number

GSM+ Second Phone Number

Real Numbers & Call Recorder

Obtain multiple virtual phone numbers from over 40 countries without needing an extra SIM card. Use these numbers for calls, texts, and registrations to protect your personal number's privacy. Enjoy affordable international communication and manage your lines easily.

Multiple virtual phone numbersSupports 40+ countriesNo extra SIM card needed

free with in-app purchases

Integral function

Integral function

by ANDRII NAIDONOV

💪 Health & Fitness

Call Recorder ™ Record Phone

Call Recorder ™ Record Phone

Automatic Calls Recording App

Easily record incoming and outgoing phone calls with unlimited length and number of recordings. Recordings are securely stored in the cloud and instantly available after calls end. Features a beautiful and simple interface for managing your call history.

Record incoming callsRecord outgoing callsUnlimited recording length

Camera Math Solver - UpStudy

Camera Math Solver - UpStudy

photo math solver

Instantly solve academic questions by taking a photo. Get step-by-step explanations, ask follow-up questions, and receive writing assistance. Features include a math solver, AI tutor, and personalized learning sessions.

Scan and solve academic questionsStep-by-step explanationsMath solver for various levels

free with in-app purchases

Homework AI - Math Helper

Homework AI - Math Helper

Scan & Solve - Answer Anything

This app assists with academic tasks by solving math problems, answering general questions, generating emails, and providing writing support. It aims to reduce homework struggles and boost productivity through accurate, step-by-step solutions and versatile assistance.

Math problem solver with step-by-step solutionsGeneral question answeringEmail generation

free with in-app purchases

CNC Function Catalog

CNC Function Catalog

Product Information

by Whoop Incorporated

This wearable device and companion app provide in-depth health insights, including sleep, recovery, and strain levels. It offers personalized coaching and recommendations based on your body's unique physiology to help you achieve your health and fitness goals.

Personalized Sleep InsightsDaily Recovery ScoreCardiovascular & Muscular Strain Measurement

💪 Health & Fitness

free with in-app purchases

fully programmable calculator

This app offers a powerful, programmable scientific calculator with graphing capabilities. It allows users to create custom functions, store equations, and perform complex calculations with ease. The interface features a visible tape display and supports dictation for statistical analysis.

Programmable custom functionsGraphing capabilitiesTape display with edit/undo

📊 Productivity

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