The best app so to speak is ear training, the only problem is that it takes some work and dedication. There are some books and some programs such as:
Ear Master Pro (I have this)
Solfege, Ear Training, Rhythm Dictation, and Music Theory: A Comprehensive Course by Ghezzo
 
If you're willing to spend 30 minutes a day on the topic, you'll find yourself arranging pop songs quite easily in no time (or any type of diatonic music in equal tempered music). When it comes to non-functional harmony, well that will take a little more time but it's well worth it. I think the single most important skill in music or audio is having a good ear. It really opens up the world to you.

I can usually determine the chord, based on 1) the root and then 2) one or two intervals around it. I have more trouble figuring out chord patterns.

Just a thought....go to youtube and listen to some simple slow blues. Most of them are 1/4/5 and 99% are 12 bar.
Type in youtube a slow blues in C as a start. Now you know the 4 chord is gona be F and the five G.
 
You will soon come to understand what a 1/4/5 sounds like in any major key.
 
Then go do the same thing in the minor keys.
 
After some time when you hear a song you will know what key it is in, and know what the chords are gona be if it is a 1/4/5 blues tune. This is not real hard to do for the common keys such as E G A Bb C D.
 
You will find that are a lot of 7th chords in this style of music and a few 9th chords from time to time.
 
If you want to learn to hear and a more complex chord, you need to understand the context. Jazz for example or at least certain types of jazz have a pretty standard chord progression and your gona find flat 5's sharp 9's 13th chords an so on. Some of these chords just have a certain sort of sound and are very easy to hear, like major 7th chords or 13th chords. It helps if you have a piano even if you do not know how to play it very well because it is very easy to form a chord on a piano. C for example the root the third the fifth C7 add the 7th note in the C scale. C9 add the 9th note in the scale and so on.
 
Don't expect for all this to fall in place in a few days but it will not take for ever.
 
I assume you play some inst. youtube has told you the key so if the key is C play a c major scale over the progression and it does not matter at the start if your solo makes any sence. Then play A minor pentatonic scale over the C major progression. A natural minor scale will fit over most of the minor progressions.
 
It is a good way to learn to solo and a good way to learn to hear the chords.
 
If you do not understand anything I just said just ask and I will help you.
 
I can show you how to do this with a VST and also with Melodyne and also there is free software to slow songs down.
 
I do this all the time when I get lazy or the song is to fast or too complex for me to understand.
 
I always can make some time to point you in a direction that will work for you. Just ask.

Ooops - sucked into another zombi thread :)
I would delete my entry if I could.

This may be what you want. chordec....cost me 3 bucks for my Iphone....downloaded a Jimmy Buffet song that I know how to play for a test. pretty much spot on.
 
Not something I have much need for but if you are using Iphone or Ipad this app seems to do a good job.
 
A fun test for me...worth the $3.00....lol

I've was 'forced' to transcribe my first tune at my early age as part of my music training. I think it's a John Denver tune. It must have been like a few weeks of listening in order to complete it. And I was told to listen to the bass first, then simply play a major or minor chords over the identified bass and hear how close it matches. If that doesn't help, simply play (with the help of a capo back then) 12 major chords and 12 minor chords chromatically for the closest match ! :) That was a good kick start for me.
 
1) Identify the bass (easier on some type of song, harder if the bass starts with 3rd or other inversions)
2) Next up, if it sounded happy (major) or sad (minor) or both major / minor can also be applied (power chord)
3) Aug and Diminish - if it doesn't fit #2.
...and later, 7th, 9th, and so on..
 
I was just practicing to hear and match on my guitar (and later keyboard, which is easier to experiment with chords) up the the fifth for a long while, covering mostly country , rock and roll and pop, but none jazzy tunes. When I'm better at that, my next is to handle the 7th : Major 7th, Dominant, minor Maj7, etc.. while ignoring additional colors.. that I don't understand. And I've never learn any theory up till this stage. Just hearing and matching. Another way is not to hear any chords, but just to listen to the bass line.
 
So, the better I'm at the basics (as in the order above), the easier I can move forward for more intervals. Learning the keyboard enables me to speed up experimenting with more intervals and complex chords. And there are more than one way to represent one chord, minus the theory, as long as it make sense to you : Bm7b5 = Dm6/B ..I was using all sort of names before I learn other type of chords.
 
Edit : and at some point later, learning theory is a must ! - so I can write proper chord names for other musicians, not necessary for my own understanding, but I'm glad I did the chord construction theory all the way up to the 13th (mostly by books, and attending workshops here and there - I'm not a music degree holder).
 

4 YEAR OLD ZOMBIE THREAD.
 

For Android, give Pitch Lab PRO a try (you'll need the paid version).
 
See here: https://play.google.com/store/apps/details?id=com.musician.tuner&hl=en
Display: https://www.youtube.com/watch?v=1umvRRm5Eg4
 
It won't give you the chord name, but can give you up to 12 note values, from which you can determine the chord name(s).

Riffstation for Pete's sake!
http://www.gizmag.com/riffstation-guitar-learning-review/27705/