The iPhone, iPad, and Android Quality Indexes boast over 650,000 reviews (in total) from websites like 148Apps, Pocket Gamer, and Gamezebo, and use a unique metric to create a single definitive score for each iOS and Android title.
Spelling it out for you
Letter Attack is the highest-scoring game in April's iPhone Qi (and iPad Qi) game chart.
The word game business is on a bit of a high at the moment, and heftyApps's attempt is a worthwhile addition to the genre.
In fifth spot, the maker of Badland takes one-button gameplay to all new levels of artistry.
Featuring an enchanting silhouette art style and an enchanting world, Frogmind's game is a tactile delight.
Qi's Top 10 iPhone games of April 2013
| Pos. | Game | Qi rating | Reviews |
| 1 | Letter Attack | 9.7 | 3 |
| 2 | The Silent Age | 9.1 | 5 |
| 3 | Gemini Rue | 9.0 | 10 |
| 4 | Draw Something 2 | 9.0 | 3 |
| 5 | Badland | 8.9 | 12 |
| 6 | Mr. Runner 2: The Masks | 8.9 | 3 |
| 7 | 94 Seconds | 8.9 | 3 |
| 8 | Cut the Rope: Time Travel | 8.8 | 9 |
| 9 | Blendoku | 8.6 | 3 |
| 10 | Final Fantasy V | 8.5 | 6 |
In third position this month on the iPad Qi Top 10 games leaderboard, meanwhile, is Gemini Rue.
This is yet another classic point-and-click adventure game that has successfully made the jump to iOS.
In truth, this masterful sci-fi detective story has the critics hooked. Look down there if you don't believe me.
Qi's Top 10 iPad games of April 2013
| Pos. | Game | Qi rating | Reviews |
| 1 | Letter Attack | 9.7 | 3 |
| 2 | The Silent Age | 9.1 | 5 |
| 3 | Gemini Rue | 9.0 | 10 |
| 4 | Badland | 8.9 | 12 |
| 5 | Crabitron | 8.9 | 3 |
| 6 | 94 Seconds | 8.9 | 3 |
| 7 | Cut the Rope: Time Travel HD | 8.8 | 3 |
| 8 | Magicka | 8.7 | 7 |
| 9 | Blendoku | 8.6 | 3 |
| 10 | Final Fantasy V | 8.5 | 6 |
Topping April's Android Qi game chart is the much-anticipated sequel to an Android great.
In ZeptoLab's Cut the Rope: Time Travel, we witness the return of the candy-chomping Om Nom.
This time around, though, he's accompanied by a variety of time-displaced partners, which mixes up the physics-puzzling rather nicely.
It's all action at #2, mind, with Glu's Frontline Commando: D-Day taking place in the thick of World War II.
Impressive 3D visuals and heart-stopping duck-and-cover gameplay give this one the edge over its rivals.
There are more World War II 'kicks' to be had down in seventh spot via Strategy & Tactics: WW II.
As the name suggests, though, this is a rather more cerebral effort than Glu's, with the emphasis here firmly on historically accurate turn-based battles.
Qi's Top 10 Android games of April 2013
| Pos. | Game | Qi rating | Reviews |
| 1 | Cut the Rope: Time Travel | 9.5 | 3 |
| 2 | Frontline Commando: D-Day | 8.9 | 4 |
| 3 | Nimble Quest | 8.9 | 3 |
| 4 | Draw a Stickman: Epic Free | 8.7 | 3 |
| 5 | Cut the Rope: Time Travel HD | 8.5 | 3 |
| 6 | Jones On Fire | 8.4 | 3 |
| 7 | Strategy & Tactics: WW II | 8.3 | 6 |
| 8 | Ninja Village | 8.3 | 4 |
| 9 | Ice Rage | 7.9 | 5 |
| 10 | Jurassic Park Builder | 7.9 | 3 |
N.B. While we only display the average score to one decimal place, the lists are generated to further significant figures. We just don't show them all.
And, naturally, these are static graphs based on live listings which are subject to constant change as new releases and reviews emerge.
In order to provide a regular marker of the critical zeitgeist, however, we will continue to round up the best of the iOS and Android games released each month to provide the definitive Quality Index top tens.
iPhone Qi / iPad Qi / Android Qi
