Top Free iPhone Apps for Productivity - App Charts

#1

↔

Gmail - Email by Google

Developer: Google, Inc.

Released: Nov 2, 2011 in Productivity

#2

↔

Google Docs

Developer: Google, Inc.

Released: Apr 30, 2014 in Productivity

#3

↔

Best VPN Proxy Betternet

Developer: Betternet Technologies Inc.

Released: Dec 17, 2014 in Productivity

#4

↔

Google Drive

Developer: Google, Inc.

Released: Jun 28, 2012 in Productivity

#5

↑3

HotspotShield VPN & Wifi Proxy

Developer: AnchorFree Inc.

Released: Oct 29, 2011 in Productivity

#6

↓1

Microsoft Outlook

Developer: Microsoft Corporation

Released: Jan 29, 2015 in Productivity

#7

↑3

Color Your Call

Developer: Mobimore

Released: Mar 19, 2018 in Productivity

#8

↓1

Google Slides

Developer: Google, Inc.

Released: Aug 26, 2014 in Productivity

#9

↓3

Yahoo Mail

Developer: Yahoo

Released: Dec 11, 2012 in Productivity

#10

↓1

Dropbox

Developer: Dropbox

Released: Sep 29, 2009 in Productivity

#11

↑1

Speak & Translate - Translator

Developer: Apalon Apps

Released: Feb 14, 2014 in Productivity

#12

↑5

Microsoft Word

Developer: Microsoft Corporation

Released: Mar 27, 2014 in Productivity

#13

↔

Google Sheets

Developer: Google, Inc.

Released: Apr 30, 2014 in Productivity

#14

↓3

HexaTech Unlimited VPN Proxy

Developer: Betternet Technologies Inc.

Released: Jan 23, 2016 in Productivity

#15

↓1

VPN 360 - Unlimited VPN Proxy

Developer: Infinity Software Co., Limited

Released: Jan 21, 2017 in Productivity

#16

↔

Google Calendar

Developer: Google, Inc.

Released: Mar 10, 2015 in Productivity

#17

↓2

X-VPN Unlimited VPN Proxy

Developer: Free Connected Limited

Released: Jun 27, 2017 in Productivity

#18

↔

iTranslate Translator

Developer: iTranslate

Released: Oct 21, 2008 in Productivity

#19

↔

T-Mobile

Developer: T-Mobile

Released: Oct 5, 2012 in Productivity

#20

↑3

Microsoft Authenticator

Developer: Microsoft Corporation

Released: May 30, 2015 in Productivity

#21

↑18

Documents by Readdle

Developer: Readdle Inc.

Released: Apr 1, 2010 in Productivity

#22

↔

Microsoft PowerPoint

Developer: Microsoft Corporation

Released: Mar 27, 2014 in Productivity

#23

↑3

Content Transf

Developer: Verizon Wireless

Released: Jul 20, 2016 in Productivity

#24

↑6

HP Smart

Developer: HP Inc.

Released: Oct 19, 2011 in Productivity

#25

↑7

Google Voice

Developer: Google, Inc.

Released: Nov 16, 2010 in Productivity

#26

↓5

Grammarly Keyboard

Developer: Grammarly, Inc

Released: Nov 2, 2017 in Productivity

#27

↓7

Microsoft OneDrive

Developer: Microsoft Corporation

Released: Dec 13, 2011 in Productivity

#28

↔

CamScanner | Document Scanner

Developer: INTSIG Information Co.,Ltd

Released: Aug 28, 2010 in Productivity

#29

↓2

VPN Proxy Master - Wifi VPN

Developer: ALL Connected Co.,Ltd

Released: Sep 16, 2015 in Productivity

#30

↓6

VPN: Fast & Unlimited NordVPN

Developer: Tefinkom & CO S.A.

Released: Dec 9, 2014 in Productivity

#31

↑3

Productive - Habit Tracker

Developer: Apalon Apps

Released: Jun 2, 2015 in Productivity

#32

↑6

SkyVPN - Best VPN Proxy Shield

Developer: Sentry Secure Communication

Released: Apr 18, 2017 in Productivity

#33

↓8

VPN Wifi Proxy Security Master

Developer: Ever Fun Apps LLC

Released: Jan 31, 2018 in Productivity

#34

↑2

Fingerprint Login: PassKey Password Lock...

Developer: DoubleVision Labs

Released: Nov 13, 2014 in Productivity

#35

↔

Microsoft Excel

Developer: Microsoft Corporation

Released: Mar 27, 2014 in Productivity

#36

↑10

Verizon Cloud

Developer: Verizon Wireless

Released: May 16, 2013 in Productivity

#37

↓6

Microsoft OneNote

Developer: Microsoft Corporation

Released: Jan 18, 2011 in Productivity

#38

↓9

SurfEasy VPN

Developer: SurfEasy

Released: May 9, 2013 in Productivity

#39

↓2

WeTransfer

Developer: WeTransfer B.V.

Released: Mar 5, 2014 in Productivity

#40

↑1

Email - Edison Mail

Developer: Edison Software Inc.

Released: Apr 27, 2016 in Productivity

#41

↑2

Noted: Notepad, Audio Recorder

Developer: Digital Workroom Ltd

Released: Dec 8, 2017 in Productivity

#42

↑3

Norton WiFi Privacy VPN

Developer: Symantec

Released: Jun 13, 2016 in Productivity

#43

↓3

DocuSign - Upload & Sign Docs

Developer: DocuSign

Released: Nov 1, 2011 in Productivity

#44

↓11

#VPN - Wi-Fi Hotspot Security

Developer: Apalon Apps

Released: Sep 26, 2016 in Productivity

#45

↑3

Voice Translator & Dictionary

Developer: BPMobile

Released: Sep 22, 2015 in Productivity

#46

↑13

Home Design 3D

Developer: Anuman

Released: Oct 25, 2011 in Productivity

#47

↓3

Evernote

Developer: Evernote

Released: Jul 11, 2008 in Productivity

#48

↑2

Google Keep

Developer: Google, Inc.

Released: Sep 24, 2015 in Productivity

#49

↓2

Adobe Illustrator Draw

Developer: Adobe

Released: Oct 7, 2014 in Productivity

#50

↓1

Unlimited VPN - Wifi Proxy

Developer: xu ganwen

Released: Jul 24, 2017 in Productivity

#51

↑10

Draw.ing Pad, Doodle Paint Art

Developer: PSQUARE

Released: Oct 29, 2016 in Productivity

#52

↑2

・MEGA・

Developer: Mega Limited

Released: Nov 26, 2013 in Productivity

#53

↑5

Notebook - Take Notes, Sync

Developer: Zoho Corporation

Released: May 22, 2016 in Productivity

#54

↓12

VPN Unlimited - WiFi Proxy

Developer: KeepSolid Inc.

Released: Oct 15, 2013 in Productivity

#55

↑12

Drawing Desk: Draw & Paint Art

Developer: 4 Axis Solutions (Pvt) Ltd

Released: Jan 26, 2013 in Productivity

#56

↑8

SmartLock - secret photo album

Developer: Ontrack Mobile

Released: Jul 31, 2017 in Productivity

#57

↔

Password Secure Manager App

Developer: Gladrap Studio

Released: Aug 1, 2012 in Productivity

#58

↓6

My TWC®

Developer: Charter Communications

Released: Feb 15, 2012 in Productivity

#59

↑9

IDM Free - Browser, Files Manager &...

Developer: Ali Ibrahim

Released: Jan 8, 2017 in Productivity

#60

↓3

SHAREit - Connect & Transfer

Developer: SHAREit Technologies Co. Ltd

Released: Oct 31, 2013 in Productivity

#61

↓2

Spark by Readdle

Developer: Readdle Inc.

Released: May 29, 2015 in Productivity

#62

↑3

Calculator +

Developer: xNeat.com

Released: Feb 5, 2010 in Productivity

#63

↑10

MyMedia - File Manager

Developer: Alexander Sludnikov

Released: Jan 6, 2011 in Productivity

#64

↑16

Cozi - Shared calendar & lists

Developer: Cozi

Released: Dec 21, 2010 in Productivity

#65

↓11

Microsoft Teams

Developer: Microsoft Corporation

Released: Nov 2, 2016 in Productivity

#66

↑5

Adblock Plus (ABP): Remove ads, Browse...

Developer: Eyeo GmbH

Released: Oct 3, 2015 in Productivity

#67

↑7

Remote Control (Universal)

Developer: Tianjia InfoTech Ltd

Released: Oct 17, 2013 in Productivity

#68

↔

Prezi Viewer

Developer: Prezi Inc.

Released: Nov 15, 2012 in Productivity

#69

↓14

TunnelBear VPN & Wifi Proxy

Developer: TunnelBear, Inc.

Released: Nov 2, 2012 in Productivity

#70

↓6

Wunderlist: To-Do List & Tasks

Developer: 6 Wunderkinder

Released: Dec 9, 2010 in Productivity

#71

↓5

SignNow - Sign and Fill Docs

Developer: SignNow

Released: Jan 19, 2012 in Productivity

#72

↑5

Second Line - 2nd Phone Number

Developer: Appsverse Inc.

Released: Feb 23, 2017 in Productivity

#73

↑2

PProtector

Developer: Mobimore

Released: Mar 27, 2018 in Productivity

#74

↓7

Office Lens

Developer: Microsoft Corporation

Released: Apr 2, 2015 in Productivity

#75

↑6

Adobe Spark Video: Movie Maker

Developer: Adobe

Released: May 8, 2014 in Productivity

#76

↓4

Bear

Developer: Shiny Frog Ltd.

Released: Nov 2, 2016 in Productivity

#77

↑9

myCricket

Developer: Cricket Wireless, LLC

Released: May 6, 2013 in Productivity

#78

↓2

Cortana

Developer: Microsoft Corporation

Released: Dec 9, 2015 in Productivity

#79

↓1

Pages

Developer: Apple

Released: Apr 1, 2010 in Productivity

#80

↓10

Scan & Translate+ - ocr Image scanner...

Developer: DataCom

Released: Apr 17, 2014 in Productivity

#81

↑9

Keynote

Developer: Apple

Released: Apr 1, 2010 in Productivity

#82

↓3

dfndr vpn - Unlimited Fast VPN

Developer: PSafe Technology, Inc.

Released: Mar 26, 2018 in Productivity

#83

↑8

Wix

Developer: Wix.com Inc.

Released: Jul 18, 2016 in Productivity

#84

↑10

Inbox by Gmail

Developer: Google, Inc.

Released: Oct 22, 2014 in Productivity

#85

↑12

Calendars by Readdle

Developer: Readdle Inc.

Released: Mar 5, 2013 in Productivity

#86

↓24

Turbo VPN: Better than a VPN

Developer: Wenze He

Released: Nov 17, 2016 in Productivity

#87

↔

Ruler App + Photo Ruler

Developer: GRYMALA

Released: Sep 13, 2015 in Productivity

#88

↔

Keeper Password Manager

Developer: Callpod Inc.

Released: Aug 14, 2008 in Productivity

#89

↓4

Offline - Files & Web Browser

Developer: Loi Nguyen Van

Released: Jan 6, 2018 in Productivity

#90

↑9

Fraction Calculator Plus - Get it right...

Developer: DigitAlchemy LLC

Released: Nov 28, 2012 in Productivity

#91

↓8

Translate Now - Translator

Developer: Wzp Solutions Lda

Released: Mar 23, 2018 in Productivity

#92

↓10

TeamViewer: Remote Control

Developer: TeamViewer

Released: Oct 2, 2013 in Productivity

#93

↓4

TruGreen

Developer: TruGreen Limited Partnership

Released: Jan 20, 2018 in Productivity

#94

↑35

Microsoft Translator

Developer: Microsoft Corporation

Released: Aug 6, 2015 in Productivity

#95

↑7

Flora - Focus, Study, Pomodoro

Developer: AppFinca Inc.

Released: Sep 7, 2017 in Productivity

#96

↓4

McAfee Mobile Security

Developer: McAfee, Inc.

Released: Jan 8, 2014 in Productivity

#97

↑1

My Scans, best PDF Scanner App

Developer: TOP APP d.o.o.

Released: Jul 30, 2015 in Productivity

#98

↑3

Planner Pro - Daily Calendar

Developer: Fengge

Released: Oct 28, 2012 in Productivity

#99

↑8

XFINITY Connect

Developer: Comcast

Released: Jul 15, 2009 in Productivity

#100

↓7

LastPass Password Manager

Developer: LogMeIn, Inc.

Released: Aug 1, 2009 in Productivity

#101

↓17

Elite Emoji

Developer: GhostWording

Released: Aug 23, 2017 in Productivity

#102

↓2

Microsoft SharePoint

Developer: Microsoft Corporation

Released: Jun 20, 2016 in Productivity

#103

↑13

Universe — Website Builder

Developer: Future Lab, Inc.

Released: Mar 20, 2017 in Productivity

#104

↔

Weebly

Developer: Weebly, Inc.

Released: May 2, 2012 in Productivity

#105

↑6

Pocket Schedule Planner

Developer: Appxy

Released: Feb 23, 2011 in Productivity

#106

↓1

Translate Me - Live Translator

Developer: Neosus

Released: Jun 13, 2017 in Productivity

#107

↑15

T-Mobile Content Transfer

Developer: T-Mobile

Released: Jun 6, 2016 in Productivity

#108

↑18

BT Notifier Pro for Smartwatch

Developer: Mobile Security

Released: Apr 5, 2018 in Productivity

#109

↓14

Dashlane Password Manager

Developer: Dashlane

Released: May 21, 2012 in Productivity

#110

↓14

Translator keyboard - Transkey

Developer: Beijing Sogou Technology Development...

Released: Apr 18, 2018 in Productivity

#111

↑14

InkPad Notepad - Notes - To do

Developer: Workpail, LLC

Released: Jul 27, 2015 in Productivity

#112

↓3

SanDisk iXpand™ Drive

Developer: SanDisk

Released: Mar 11, 2016 in Productivity

#113

↑7

Unit Converter FREE - Best Units &...

Developer: Alan Mrvica

Released: Mar 26, 2013 in Productivity

#114

↑3

Dr. Cleaner

Developer: Trend Micro, Incorporated

Released: Oct 13, 2016 in Productivity

#115

↑36

Tayasui Sketches

Developer: Tayasui.com

Released: Jun 1, 2013 in Productivity

#116

↓8

PingID

Developer: Ping Identity Corporation

Released: Jul 2, 2014 in Productivity

#117

↓2

Opera VPN

Developer: OSL Network

Released: May 9, 2016 in Productivity

#118

↑9

AnyList

Developer: Purple Cover, Inc.

Released: May 11, 2012 in Productivity

#119

↑4

VPN 24: Hotspot VPN for iPhone

Developer: 24apps GmbH

Released: Dec 14, 2016 in Productivity

#120

↓14

Evernote Scannable

Developer: Evernote

Released: Jan 8, 2015 in Productivity

#121

↓18

Star VPN - Unlimited VPN Proxy

Developer: Oleksandr Veretelnykov

Released: May 25, 2016 in Productivity

#122

↓1

Numbers

Developer: Apple

Released: Apr 1, 2010 in Productivity

#123

↓13

My Walmart Schedule

Developer: Walmart

Released: Aug 16, 2017 in Productivity

#124

↓11

SmartHub

Developer: National Information Solutions Cooperative

Released: Nov 14, 2011 in Productivity

#125

↓11

WordPress

Developer: Automattic

Released: Oct 29, 2009 in Productivity

#126

↑4

Tiny Calendar

Developer: Fengge

Released: Apr 10, 2012 in Productivity

#127

↓8

Cleaner - Master Phone Battery

Developer: thu nguyen thi

Released: Dec 11, 2017 in Productivity

#128

↓10

1Password

Developer: AgileBits Inc.

Released: Dec 13, 2012 in Productivity

#129

↓5

Any.do: To-do list & Calendar

Developer: Any.DO

Released: Jun 4, 2012 in Productivity

#130

↑12

Adobe Capture CC

Developer: Adobe

Released: Oct 5, 2015 in Productivity

#131

↑35

Unsplash

Developer: Unsplash

Released: Apr 5, 2018 in Productivity

#132

↑2

myMail – Email App

Developer: MY.COM

Released: Nov 5, 2013 in Productivity

#133

↓2

Smart Home Manager

Developer: AT&T Services, Inc.

Released: Aug 23, 2017 in Productivity

#134

↑13

Planner 5D - Interior Design

Developer: Planner5D, UAB

Released: Apr 30, 2013 in Productivity

#135

↑14

Resume Star: Pro CV Maker and Resume...

Developer: Qrayon, LLC

Released: Nov 12, 2013 in Productivity

#136

↑3

Text to Speech!

Developer: Gwyn Durbridge

Released: Sep 27, 2013 in Productivity

#137

↑11

HP ePrint Enterprise

Developer: HP Inc.

Released: Mar 13, 2011 in Productivity

#138

↓5

DayCount

Developer: Harry Khoury

Released: Jun 16, 2016 in Productivity

#139

↑23

Send Anywhere - File Transfer

Developer: ESTmob Inc.

Released: Jan 31, 2013 in Productivity

#140

↑29

Flashlight ¤

Developer: Surpax Technology Inc.

Released: Oct 12, 2010 in Productivity

#141

↑17

Skins for Minecraft - PE Skins

Developer: eDevGames, Inc.

Released: Apr 22, 2016 in Productivity

#142

↓6

Ever - Photo Backup & Storage

Developer: Everalbum, Inc.

Released: May 17, 2014 in Productivity

#143

↓6

Adobe Photoshop Sketch

Developer: Adobe

Released: Jun 18, 2014 in Productivity

#144

↓16

VPN Guru - Master of Fast VPN

Developer: Chi Zhang

Released: Sep 23, 2017 in Productivity

#145

↓10

ProtonMail - Encrypted Email

Developer: ProtonMail

Released: Mar 17, 2016 in Productivity

#146

↓8

TWC WiFi Finder

Developer: Charter Communications

Released: Jan 14, 2012 in Productivity

#147

↓6

Pocket Points™

Developer: Pocket Points, Inc.

Released: Sep 9, 2014 in Productivity

#148

↓3

TextMe Up Second Phone Number

Developer: TextMe, Inc.

Released: Oct 13, 2015 in Productivity

#149

↓3

Adobe Spark Page

Developer: Adobe

Released: Apr 2, 2015 in Productivity

#150

↑47

Smart Likes for Instagram Tags

Developer: Junyue Wang

Released: Feb 22, 2018 in Productivity

#151

↑8

monday.com (formerly dapulse)

Developer: monday.com Ltd.

Released: Oct 10, 2017 in Productivity

#152

↑23

Password Manager Secure App

Developer: Free Secure App Manager For Lock Private...

Released: Jun 6, 2015 in Productivity

#153

↓3

VPN - Master VPN for iPhone

Developer: Sapling Growth Tech Co., Ltd.

Released: Aug 14, 2017 in Productivity

#154

↔

FamCal: Shared Family Calendar

Developer: Appxy

Released: Apr 7, 2016 in Productivity

#155

↑9

Fing - Network Scanner

Developer: Domotz Ltd

Released: Apr 19, 2011 in Productivity

#156

↑16

LDS Tools

Developer: The Church of Jesus Christ of Latter-day...

Released: Sep 15, 2010 in Productivity

#157

↑23

WebDuo Pro

Developer: Cayenne LLC

Released: Jan 7, 2016 in Productivity

#158

↔

Cool Fancy Text Generator

Developer: Hai Nguyen Hoang

Released: Aug 16, 2017 in Productivity

#159

↓2

My CenturyLink

Developer: CenturyLink, Inc

Released: Feb 17, 2016 in Productivity

#160

↓5

Event Countdown Lite

Developer: ROOT38 LIMITED

Released: Apr 16, 2015 in Productivity

#161

↓1

Todoist: Organize your life

Developer: Doist

Released: Nov 18, 2012 in Productivity

#162

↑43

Symbol Keyboard - 2000+ Signs

Developer: Zhong XiaoMi

Released: Nov 14, 2011 in Productivity

#163

↓11

Do! - Simple To Do List

Developer: SU WON SHIN

Released: Mar 9, 2011 in Productivity

#164

↓3

TimeTree: Shared Calendar

Developer: JUBILEE WORKS, Inc.

Released: Mar 19, 2015 in Productivity

#165

↓2

IFTTT

Developer: IFTTT

Released: Jul 11, 2013 in Productivity

#166

↓26

Safe VPN Connect - Hotspot VPN

Developer: McAfee, Inc.

Released: May 1, 2017 in Productivity

#167

↓23

Noti:Do with Reminders

Developer: KIM KYUNG MIN

Released: Apr 1, 2014 in Productivity

#168

↓25

SurveyMonkey

Developer: SurveyMonkey

Released: Feb 20, 2014 in Productivity

#169

↓16

Voice Recorder - Perfect Recording &...

Developer: Jianxiang Lin

Released: Apr 1, 2017 in Productivity

#170

↑17

MyHyundai with Blue Link

Developer: Hyundai Motor America

Released: Jul 6, 2014 in Productivity

#171

↑36

WhoIs - Phone Number Lookup

Developer: Numan Sattar

Released: Feb 21, 2018 in Productivity

#172

↑5

Homework App

Developer: Gabriel Asel

Released: Sep 10, 2016 in Productivity

#173

↑18

VPN by Private Internet Access

Developer: London Trust Media, Inc.

Released: May 24, 2015 in Productivity

#174

↓42

VPN for iPhone - Unlimited VPN

Developer: Mobile Jump

Released: Feb 6, 2018 in Productivity

#175

↑7

Rhymer's Block

Developer: Catechlysm

Released: Jan 17, 2014 in Productivity

#176

↑12

Workflow

Developer: Apple

Released: Dec 11, 2014 in Productivity

#177

↑29

Notes, Notepad & Memo - UpWord

Developer: Lau Brothers LLC

Released: Jan 22, 2014 in Productivity

#178

↑1

Downloads Plus - Downloader Manager for Free

Developer: ling chen

Released: Jan 29, 2016 in Productivity

#179

↑61

Fillr – Autofill for mobile

Developer: Pop Tech Pty Ltd

Released: Apr 15, 2015 in Productivity

#180

↑1

Doodle: Easy Scheduling

Developer: Doodle AG

Released: Apr 14, 2015 in Productivity

#181

↓14

My Contacts Backup

Developer: GLOBILE BILISIM BILGISAYAR HIZMETLERI...

Released: Jul 6, 2011 in Productivity

#182

↑29

IDrive Online Backup

Developer: IDrive Incorporated

Released: Mar 30, 2011 in Productivity

#183

↓5

Automatic Call Recorder™ Pro

Developer: Myrtha Murat-Vernous

Released: Jul 21, 2016 in Productivity

#184

↑37

Quick Scan - Barcode Scanner

Developer: iHandy Inc.

Released: Aug 1, 2011 in Productivity

#185

↓29

Office 365 Message Encryption Viewer

Developer: Microsoft Corporation

Released: Dec 12, 2014 in Productivity

#186

↓16

Yoga VPN - Unlimited Proxy VPN

Developer: Sarah Hawken

Released: Jun 19, 2017 in Productivity

#187

↓1

PocketLife Calendar

Developer: OvalKey Ltd.

Released: Feb 26, 2010 in Productivity

#188

↓17

VPN - Unlimited VPN for iPhone

Developer: Sapling Growth Tech Co., Ltd.

Released: Jun 27, 2017 in Productivity

#189

↔

U.S. Cellular – My Account

Developer: U.S. Cellular

Released: Sep 20, 2017 in Productivity

#190

↑8

TeamViewer QuickSupport

Developer: TeamViewer

Released: Jul 9, 2013 in Productivity

#191

↑29

VPN in Touch

Developer: BetterNet LLC

Released: Sep 18, 2011 in Productivity

#192

↑35

VidClips - Perfect Movie Maker

Developer: JIANCAI HE

Released: Oct 3, 2015 in Productivity

#193

↓1

LineUp - Second Phone Number

Developer: KeepSafe Software, Inc.

Released: Jul 23, 2012 in Productivity

#194

↑5

In Moment - Limit Phone Usage

Developer: Irina Vyaznikova

Released: Dec 22, 2016 in Productivity

#195

↔

Old Notepad

Developer: 1381802 Ontario Inc.

Released: Nov 1, 2013 in Productivity

#196

↓23

Microsoft To-Do

Developer: Microsoft Corporation

Released: Apr 19, 2017 in Productivity

#197

↓32

QuickTrip® Route Planner

Developer: Allstate Insurance Company

Released: Oct 13, 2016 in Productivity

#198

↓2

Cleaner Pro .

Developer: YT Development Ltd

Released: Apr 30, 2012 in Productivity

#199

↑13

ColorSnap® Match

Developer: Variable Technologies LLC

Released: Feb 1, 2017 in Productivity

#200

↑19

Motivational Quote - New motivational...

Developer: Moonhead Apps LLC

Released: Sep 25, 2016 in Productivity

Top 200 Free iPhone Apps for Productivity