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How to find subscriptions you are paying for.
Settings > click your name at the top > iTunes & App Store > click Appie ID at the top > View Apple ID > Subscriptions Recommended Apps Most as of 2014.

Apps for iPads, iPhones and iPod touch

Google Search for iOS Apps The App Store

SearchMan: App Store Optimization & SEO Software, Made Easy - For developers - tracks searching keywords for your app.

Some sections below of interest:
Photo | Medical Apps | Emergency Apps | Dave Marra | Travel, Navigation and Weather | Princeton Library | Call blocking

iPad Reaches 60,000 Apps Milestone Ahead of 10 Billionth iOS App Download | PadGadget, Jan., 2011. (iOS is the Operating System used in the iPhone, iPod touch and iPad.)

Of the 200 Apps below from the top apps listed at 10 different sources, the following 25 appeared in 2 or more lists.
You can see from this that there is not much common agreement except for Angry Birds, Flight Track, Good Reader, Instapaper, Star Walk and Epicurious.

Notation: 4+ (800) = rating >4 out of 5, 800 people rated it


The apps I use the most are messages, phone, contacts, calendar, camera and reminders which came with the iPhone. I use reminders for my shopping list.
Most frequent downloaded apps.
Gmail
Chrome (I also use safari, but "find in page" works better in chrome)
    (It should sync bookmarks with my mac, but doesn't)
Google Maps
Waze is another mapping app that I use sometimes
Key Ring - I keep my loyalty cards here so I don't have to carry them around in my wallet
Evernote - Mainly to look up notes I've typed on my mac (also works on windows)
Dunkin' donuts
Starbucks
Weather underground (accuweather an the weather channel are also good)
NJ Transit
United airline app


Productivity apps (word processing, spread sheet, presentation):
QuickOffice Connect Mobile and Documents To Go allow you to read and edit Microsoft office documents (Word, Excel, PowerPoint)
Apples own iWork suite (Pages, Numbers and Keynote) also have iPad versions. They will also read MS Word, Excel and PowerPoint docs1.
Pages is the best word processor on the iPad.
Office HD is another app similar to Documents To Go and Quickoffice.

At Choosing the Best iPad Office Productivity App | App Reviews | App Chronicles they say:
"If you own a Mac and sync a lot, or if you plan to keep your work on your iPad, then the clear winner here is the iWork Suite.
For most users, though, Office compatibility and cloud support probably matter. If you use a Windows PC, and/or you need your iPad to be compatible with online services and the computers of friends and coworkers, then you want one of the other apps. Here, QuickOffice is the best choice."

At QuickOffice Connect Mobile Top 11 Productivity Apps for the iPad | Apps Reviewed AppCraver

Note Apps:
Typed Text:
Evernote seems to be the most popular.
Springpad
Catch (formerly 3banana) (4.3)
Notes Plus (typed or handwriting)
WhiteNote (potential but buggy, June. 2010)
SmartNotes
Writepad $10 works with Dropbox sync to sync with your laptop or desktop.
Best note taking app for iPad - Apple iPad Forum

Ink Blogging (saves handwriting as a graphics file):
FastFinga and PenUltimate were recomended.

1. Keynote on the iPad loses some information. Presenter notes and master slides don't show up.

Transferring files from your Mac or PC to your iPad can be convoluted. Some things like contacts from Microsoft Outlook or iCal on a mac can be set up to sync thru iTunes or from Google Contacts. Others require a Apple MobileMe (iWeb) or Microsoft Exchange account.

Medical Apps:
See Smartphone Medical Devices in health.
Sleep Tracking Apps

Emergency Apps:


Killer tablet apps, ConsumerReports, April, 2012
Communication: FaceTime, Skype
News-Magazines: Pulse, NPR, Zino
Video: Optima, HBO Go
12 apps that make the most of a tablet: Consumer Reports, Sept, 2011
Apps Magazine Mar 2011
Apps with a 4 or 5 star rating I thought looked interesting.
Dropbox
Air sharing
Facebook
Evernote
Skype
Webmd
Wikipanyon
Google earth
Friendly (facebook)
Wordpress You



(cont.)
Offline  reader
Epicurious recipes
Easy food
Dog tricks & bark machine
Keynote $10
Whiteboard HD *
Blueprint sketch
Tap forms hd $9
Documents to go
Assistance
Trails gps tracker
Iski trail maps
Flight track

MapMyRide vs Strava: A Detailed Comparison
10 Apps You Should Download
for iPad 2 | Gadget Lab | Wired.com
Mar. 2011
Dropbox
Air Video
Friendly (facebook)
GarageBand
Infinity Blade
Instapaper
Flipboard
PenUltimate
TuneInRadio
World of Goo
iPad Handbook 2011 - 44 and 5 star apps
Utilities:
  Bento (database)
  Good Reader
  Shazam
  Dropbox
  Air Display4 - external screen
  Penultimate4
  TuneIn Radio4
  Calculator4
  Desktop4 - Split screen
  LogMeIn Ingnition4
  Things4 - to-do list
Productivity:
  iAnnotate
  iA writer4
  Mocking Pad4
Lifestyle - Reference:
  iBooks
  Kindle
  Free Books
  Night Stand (clock)
  Instapaper
  eBay for iPad
  Articles - Wikipedia interface
  Audio Books4
  Right Move for iPad4 - Real estate
  Living Earth4
  Amazon Window Shop4
 
Social Networking
  Twitter
  Wordpress
  Twitteriffic4
  AIM for iPad4
Education:
  Star Walk
  iTranslate
  The elements
  TED4
  ED Brain4
News:
 The 12 Best News And Reading Apps - Business Insider
 App Reviews: USA Today, CNN, ABC News, BBC News, Pulse News, AP Mobile, Flipboard, Zite
 Best News Apps | Personalized for Smartphones and Tablets
 13 Great iPhone News Apps
 
  NY Times Editors choice
  Pulse News Reader
  The Early Edition - RSS aggregator 
  Flipboard4
  NetNewsWire4 - RSS reader
  Slow Feeds RSS Reader
  ReadKit RSS, Instapaper, Delicious, New BLur, ...
Travel & Navigation
  Flight Track
  Urban Spoon4
  Forever Map4
  Foodspotting  2.8  (4 on android) 
Art & Photo
  Brushes
  Art Rage
  Strip Designer
  Remote Pallet
  Camera Apps
Kitchen:
  Epicurious
 
Family Fun:
  Dr Seuss's ABC
  Marvel Comics
  ComiXology Comics
  Magic Piano
Games:
  Angry Birds
  Mondo Solitare
  Strategery
  Halcyon
  MultiPong
  Modern Combat 2: 
     Black Pegasus
  Minigore HD
  Sooziz
  Vector Runner HD
  Galaxy on Fire
  Space Invaders IG
  Prince of Persia
  GTA: Chinatown Wars
  Reckless Racing HD
  Let's Golf 2 HD
  Mini Golf Game 3D
  Bulls i 3D Darts
Apps for Mac 4.5 or better Productivity 1Password Evernote Fantastical Sandvox Droplr istudiez-pro Things Finance Mint QuickView Reference Delicious Library 2 Utilities iClip Education Solar Walk for Mac Entrtainment SketchBoook Pro 6 Photography Colorstrokes
Top Downloads From the Top Mobile App Store
@ tomsGuide.com Feb., 2011
Pandora
Google Mobile App
Movies by Flixster
Google Earth
Yelp
Fandango Movies
Remote
iBooks
Bible
Solitare
SoundHound
StickWars
FlightTrack
Backbreaker Football
Calorie Tracker
BlocksClassic
iFart Mobile
GoodReader for iPad
Cro-Mag Rally
Ambiance
Most popular apps of 2010 | InfoWorld
Pages
GoodReader
Angry Birds
Numbers
WolframAlpha
Friendly Plus for Facebook
Starwalk
10 iPad Apps Everyone Should Have | PCMag.com Nov. 2010
PhotoShop Express
Epicurious
NetFlix
Kindle
AP Mobile
Instapaper Pro
iWork
iDisplay - Turn your iPad
  into a side monitor for any
  Mac or even Windows 7 PC.
TweetDeck
Angry Birds
Top 10 Must-Have iPhone Apps - NYTimes Nov., 2010
Google
Soundhound (Like Shazam But Faster)
Hipstamatic ($2) 
Evernote (Free)
Angry Birds ($1) 
Urbanspoon (Free)
Star Walk ($3) 
Firefox Home (Free) 
Quickoffice Mobile Suite ($5)
Redlaser (Free)
Quick Calls
Others
Papers - organize scientific papers
iQue - (same as Forget on the iPhone) - 
   keep passwords, acct. nos. ...
Things for iPad - To-do organizer
iPad App Reviews Guide 2011 - 4.5 and 5 star apps
Utilities:
  TeamViewer HD
  Snowblaze HD
Lifestyle:
  My Data Usage Pro
Navigation:
  ViewRanger Premium
Productivity:
  Awesome Note
  Bento
Business:
  Agendas
  eBay for iPad
  Quickoffice Connect
  iRdesktop
Travel
  Rough Guides World Lens
Reference:
  Articles for iPad
  Google Earth
News:
  The Guaardian Eyewitness Guardian
    News and Media Limited
  Pulse News Reader
Books:
 eReader
 iBooks
 The Merck Manual
 Solar System for iPad
  
Social Networking
  AIM for iPad
  Facebook
  Skype
Sports
  Fantasy Monster Pro HD
Entertainment:
  iMDb Movies & TV
  Remote
  Sky+
Health & Fithess:
  Calorie Tracker
Music:
  AmpliTube
  Shazam
Photography:
  ArtStudio
Dave Marra - Sr. Apple Rep. 2013
iLife for iPad:
  iPhoto
  iMovie
  GarageBand

iWork for iPad:
  Keynote
  Pages
  Numbers

iBooks Textbooks for iPad:
  iBooks
  iTunes U

Photography Apps:

  Color Splash Studio
  Diptic
  Filterstorm
  FX Photo Studio HD
  Iris
  iDarkroom HD
  iPhoto
  Photoshop Express
  PhotoToaster
  Pixlr-o-matic
  Snapseed 4 (6,750)
  Pressgram 4.5 (184) - 
See Photo
 
iPad Photo & Video Apps list at iTunes 
(the above link worked on Safari but not Chrome)
You can open iTunes > click iTunes Store
 > App Store > All Categories > Photo & Video

 Music Apps:
  Animoog
  Arctic Keys
  Arturia iMini
  BeatMaker 2
  DM1
  Figure
  Filtatron
  FunkBox
  GarageBand
  KORG iKaossilator
  Magellan
  MorphWiz
  NLog MIDI Synth
  Notion
  Rockmate
  SoundPrism Pro
  Sunrizer
  Tonar
  iPad Music Apps 
   You can open iTunes > click iTunes Store
    > App Store > All Categories  > Music
  Band In Your Hand
    Go to music above then scroll down 
     to Band In Your Hand

 

Other Apps:

  Action Movie
  Air Sketch
  FlightTrack
  Foldify
  Leafsnap HD
  LookTel Money Reader
  Proloquo2Go
  SayHi
  Sign4Me
  Star Walk
  The Elements
  Word Lens

Incredible iPad Apps for Dummies, by Bob "Dr. Mac" LeVitus with Bryan Chafffin, 2011
10 favorite free apps
Comics
Dragon Dictation
Dropbox
Epicurious Recipes
Flipboard
Google Mobile App
iBooks
Pandora Radio
Pocket Legends
Shazam for iPad
10 favorite pay apps
 
1Password $10
Air Display $10
Air Video $3
Angry Birds $5
Bill Atkinson's PhotoCard $5
Atomic Web Browser $1
Improvox $8
Instapaper $5
iTeleport $25
OmniGraffle $50
Productivity Apps:
 
Corkulous $4
Dropbox free
OmniGraffle $50
Print n Share $9
Things $20
Dragon Dictation free
GoodReader $1
Instapaper $5
SoundNote $5
Use your Handwriting free
Utilities
1Password
Atomic Web Browser
iTeleport
Lielike Alarm Click and Weather HD
Marquee
Air Display
Air Sharing HD
Audio Memos Free - The Voice Recorder
Calculatior XCL
Free App Tracker
"WiFi SweetSpots" app will test  the local connection between the device & router.
Business:
 
iAnnotate PDF
Pages
PrintCentral for iPad
Quickoffice Connect Mobile Suite for iPads
Filemaker Go for iPad
Keynote
Numbers
OmniGraphSketcher
Prompster
Travel, Navigation and Weather:
 
GPS and Map Apps
Bill Atkinson's PhotoCard $5
FlightTrack Pro
Inrix Traffic/Inrox Trafffic Pro
MotionX GPS Drive HD
WeatherBug
Google Earth
KAYAK Explore + Flight Search
WiFiGet HD
Wikihood/Wikihood Plus
The World Clock
Eat Well Global
iPhone GPS navigation buying advice | Consumer reports When comparing iPhone applications to PNDs (portable navigation device) in our testing, we find that the iPhone does not match the accuracy found in even basic dedicated devices. This has been consistent over the several apps we have tested. The simple advice is to choose an app from a name-brand company such as Magellan, Navigon, and TomTom. These are large companies with many years of experience in developing navigation products and software.

This is only 6 of 19 categories in the book.

Bible Readers:
BibleReader (Olive Tree), Bible/YouVersion and Logos are the big three.
See Bible Apps

* The HD moniker is for apps which are iPad only, not iPhone

Twitter:
iPad Handbook

Magazines - Books:
iPad Handbook 2011 (at Costco)
Tap! The iPhone and iPad magazine
Five-Star Apps: The best iPhone and iPad apps for work and play, by Glenn Fleishman, 2011 Apps Magazine
IPad App Reviews Guide

Links:
Apple - iPad - From the App Store
Forums:
See Forums at iPad page.

App recommendations:
Top 100 Apps | The Apps Magazine Website
Top 30 best iPad apps - paid apps | News | TechRadar UK
The 50 Best iPad Apps | PCMag.com Nov., 2010
My must-have iPad apps
10 Apps You Should Download for iPad 2 | Gadget Lab | Wired.com
The 50 Best iPad Apps | PCMag.com
BestAppSite.com
MyAppWorld.com | An independent web magazine about everything Apple iPad
15 Best iPad Apps for Newbies | NetworkWorld.com
Best iPad Apps List 2010/2011 | BestiPadAppsList.com
Top Free iPad Applications - Best Free iPad Apps for the iPad Tablet
iPhone App Reviews by the Experts at Macworld | Macworld
Apple iPad Apps Review - Best Reviews of Latest iPad Apps, Accessories and News Online
Gizmodo's Essential iPad Apps
Google Search


Princeton Library presentation at PMUG Jan 2014
Princeton Public Library staff members Janet Hauge and Erica Bess share their picks for the best free apps for organizing, traveling, cooking, productivity, and more.
Janet's Recommended Apps
Goodreads (reading)
Epicurious (food)
HopStop for iPhone and iPad (travel)
Instagram (photography)
Overdrive (reading)
Google Translate (communications)
XE Currency (travel)

Erica's Reccomended Apps
Pinterest (organization)
Google Goggles (travel/general interest)
iTunes U (handy tool)
Readability (Reading/viewing)
Shazam (Music)
CamScanner for iPhone and iPad (productivity)
Penultimate (for iPad only) (creativity)
Color Capture by Benjamin Moore /Sherwin Williams Color Snap (home design)
Adobe Photoshop Express (photography)

App guides:
Mobile App Reviews - AppFind

last updated 10 Dec 2014