Okay it is my favorite drum machine on Android. Not the most versatile and listener friendly but just because there is nothing like it. Have not heard anything like it in VST or as hardware either, so yapps totally worth having.
Now it comes loaded with hidden features and updated to make your rhythms go more bouncy and crank it to eleven and encounter the hidden bonus.,.. Yes your pesky neighbors will soon vacate next door.

Here is what the developer had to say about it on Instagram:
(www.instagram.com/tv/B2hpoaqBKAo/?igshid=i704nhw8gd4e with video)

Uploaded a new version, lots of new rhythmic options like polyrhythms and variable retrigger rates. There's also a hidden feature to add controls for the attack on the amplitude and pitch envelopes if you tap the bottom right button of the title five times (to the right of the n in Dragon on the main page.) Hid that because it's not usually used in drum synthesis and to keep things simple. Complete list of changes is on the stores. The program should still be as lightweight as before. This video shows a few of the new presets: disconnect, coininit, rattlesSs, basis by cup, Drassin

Google Play:
​play.google.com/store/apps/details?id=com.thiiird.drgn

Worth spending a little bit of money for some real flavors...

Here is what the developer said about the video:
Another jam with Dragon. Trying to use the effects together in this one. Got the band-pass filter doing some melodic stuff in the second half. Audio engine coded in Pure Data.

Google Play:
​play.google.com/store/apps/details?id=com.thiiird.drgn

So it is starting...
If you missed the news of Audioroute-
It is the first open system (there was one earlier but with less support and there is Soundcamp that only works for high end Samsung devices) that allows for connecting audio apps like plug ins.
The developers behind nTrack Studio is behind it and so now this drum machine can be used in that DAW. This is of course another reason to get n-Track Studio as the apps adopting Audioroute will be usable in n-Track as a DAW like one for PC/MAC/Linux with virtual instruments and effects.
It will be very exciting to see what app will be next...

There is a Demo version as well...

Google Play:
play.google.com/store/apps/details?id=com.elliottgarage.newproject

ElliottGarage presents EGDR 808 for Android, a drum machine that emulates the vintage hardware from the 80's.
EGDR 808 ha been reviewed as one of the best drum machines on the iOS world, and it's now available for Andorid devices too.

Its realistic and clear interface recalls the analog machine from the past, for all the vintage fanatics.
You can play with the rythm presets included or you can create your own pattern, and save the audio in the Music folder of your device.

Connect it with other Android musical apps and effects using AudioRoute!

Features:
- Interface like the real drum machine from the 80's
- 16 steps sequencer
- 12 programmable rythm patterns and 4 fills patterns
- Auto fill in every 2, 4, 8, 12 or 16 pattern
- Save the pattern you've created and play your songs
- Manual Play, Pattern Write and Pattern Clear mode
- Drumkit pieces parameters control (tuning, decay and snappy)
- Export the groove into your device Music folder
- AudioRoute* support

Check the videos on http://www.youtube.com/ElliottGarage

support: info@elliottgarage.com

* AudioRoute Technology by n-Track

Google Play:
play.google.com/store/apps/details?id=com.teotigraphix.drumpadbeats.demo

Drum Pad Beats is a fun beat/composer - scene/remixer to capture those ideas when that flash of inspiration hits while away from the studio.

Drum Pad Beats is aimed at users that want to create rhythms and melodies using pads and step sequencers. With the added ability to export their creations to wav, ogg or midi loops (zip, pcmsynth for Caustic), user ideas can be taken farther in mobile or desktop Digital Audio Workstations.

Great for sharing beats/tracks as dpb files and remixing another artist's track, the track could then be remixed again adding even more flavor. Drum Pad Beat's project file contains everything another user needs to take that idea even farther.

Drum Pad Beats Discord - https://discordapp.com/invite/DS9J3cy (Drop in and say Hi)

New to Drum Pad Beats? Check out the friendly, In App Help UI and Quick Start Guide: https://www.teotigraphix.com/help/drum-pad-beats/index.html

HELP VIDEOS

https://www.youtube.com/watch?v=KnyZaJjWFOw&list=PLfafVvhM8YrfbSWV_w8I8S4Vi17JeL2h8&index=1

FEATURES

+ Adjustable U/I scaling (Settings)
+ Portrait or Tablet layouts
+ In App Help UI with documentation tips
+ 16 Drum pads, 12 Synth pads
+ Dual pad layout for Drum and Synth pads on one screen (remixing/recording live)
+ 63 Scene containers for programed Pad loops w/ 1 2 4 8 measures
+ Song sequencer with 16 playable/exportable sections.
+ Sampler and Chord Arpeggiator, diatonic chord interval arpeggios
+ Keyboard layouts for synth or sampler, 64, 36, 16 pad variations
+ Custom Scale and Key globally or per Scene
+ Record real-time remixes from pad looping and Scene changes as wav, ogg, midi
+ Record overdub for note entry (touch latency varies per device)
+ Metronome timing
+ Full Mixer and Effect for all Drum/Synth pads
+ Drum pad choke groups (4 groups per 8 pads)
+ Audition Browser to load/hot-swap new Drum/Synth kit sounds
+ Expandable Sound Library with Sound expansion packs available on Google Play.
+ Factory Sound Kits (808, 909, Metatronics, various others)

NEW/LOAD/SAVE/EXPORT

+ Create New Project
+ Load Recent/Project
+ Save Project As...
+ Export .pcmsynth preset with MIDI for the Caustic App
+ Export (each Scene/Section as a separate) .wav, .ogg, .mid to your favorite DAW or midi editor
+ Export Song MIDI as one file containing individual channels for each pad 
+ Export Scenes as wav loops zip archived

STEP SEQUENCER

+ Custom Scene color/name
+ Pad loop trigger for remixing live.
+ 63 unique pattern scenes with 1, 2, 4 and 8 measures
+ Pattern 1/16 & 1/8 Swing

PATTERN EDITING

+ Drag n Drop Pad or Scene to Move or Duplicate note data.
+ Clear all Scene data, per pad bank note data or per pad note data
+ Duplicate note data when expanding measure length
+ Arpeggiator note generation with Samplers and Synths (allows for happy accidents)

Plus a lot more... Check out the videos and help documentation

NOTE - The Demo is a fully functional app with the non-activated Full features listed below;

App Menu commands not activated

- Load Recent Project
- Load Project
- Save Project As...
- Export As.. (wav/ogg/mid)

Functionality

- Arpeggiator generator.
- Real-time MIDI/Audio record/remix wav/mid/ogg..
- Scene Export (wav/ogg/mid).
- Section Export (wav/ogg/mid).
- Song Export (wav/ogg/mid).

There is a lot of small funny toys now for anyone with some extra cash...
These looks like they could be fun and the app provide a lot of control that would have been hard to fit into such small machines otherwise...
Myself have been snared into toyland and have a small drum machine -tek.Drum and in the end got a Volca Bass for a good price second hand. 
So it is nice to have these things around as they provide some inspiration.
How much they actually gets used in the end is something else...

Google Play:
play.google.com/store/apps/details?id=com.modalelectronics.craftapp

There is some apps that have been on a list mentally to get and the last week or so have gotten them and one of them was this.
A very good buy in my opinion as it brings a dirtiness that is not found in any other apps (or in 95% of hardware drum machines either).
Plus that it is not sample based but synthesized which opens up a lot of more fun hands on tweaking.
It is easy to get into and have a lot of posssibilites for tweaky fun but it is not for everyone,
but anyone looking for a drum groovebox app to play dirty with should check this out!

Update:

​Added amplitude controls to snare and bass drum
Added tone distance control to snare
Added noise control to bass drum
Added presets Dinon, crushed hornet, 806, 807, grid grime
Made font size relative to screen
Changed wav naming convention

Google Play:
​https://play.google.com/store/apps/details?id=com.thiiird.drgn

P.s-
This video shows it at its dirtiest and want to mention that it is possibe to get a bit more cleaner tones and also the kick can get very punchy which is not so obvious here.

This is made by a developer that have made some other apps that is based on using the Caustic engine. He is also the web director of the Cautic website, singlecellsoftware.com.

This app seems to me to be the most advanced one yet and if not paying attention it may seem simplistic but seeing the videos it shows to have a lot of possibilities that are not obvious and still being an easy app to use. (Having not used it though, it is still not clear to me how the synthesizer parts work).
​Can imagine that this would be a very good app for some people.
Also as it is based on the Caustic engine it will be very stable and probably work very good on lower spec devices. Always surprised how good Caustic works on my five year old devices that was not that good to begin with! 

Google Play:
https://play.google.com/store/apps/details?id=com.teotigraphix.drumpadbeats

Drum Pad Beats is a fun beat/composer - scene/remixer to capture those ideas when that flash of inspiration hits while away from the studio.

Drum Pad Beats is aimed at users that want to create rhythms and melodies using pads and step sequencers. With the added ability to export their creations to wav, ogg or midi loops (zip, pcmsynth for Caustic), user ideas can be taken farther in mobile or desktop Digital Audio Workstations.

Great for sharing beats/tracks as dpb files and remixing another artist's track, the track could then be remixed again adding even more flavor. Drum Pad Beat's project file contains everything another user needs to take that idea even farther.

Drum Pad Beats Discord - https://discordapp.com/invite/DS9J3cy (Drop in and say Hi)

New to Drum Pad Beats? Check out the friendly, In App Help UI and Quick Start Guide: https://www.teotigraphix.com/help/drum-pad-beats/index.html

HELP VIDEOS

https://www.youtube.com/watch?v=KnyZaJjWFOw&list=PLfafVvhM8YrfbSWV_w8I8S4Vi17JeL2h8&index=1


FEATURES

+ Adjustable U/I scaling (Settings)
+ Portrait or Tablet layouts
+ In App Help UI with documentation tips
+ 16 Drum pads, 12 Synth pads
+ Dual pad layout for Drum and Synth pads on one screen (remixing/recording live)
+ 63 Scene containers for programed Pad loops w/ 1 2 4 8 measures
+ Song sequencer with 16 playable/exportable sections.
+ Sampler and Chord Arpeggiator, diatonic chord interval arpeggios
+ Keyboard layouts for synth or sampler, 64, 36, 16 pad variations
+ Custom Scale and Key globally or per Scene
+ Record real-time remixes from pad looping and Scene changes as wav, ogg, midi
+ Record overdub for note entry (touch latency varies per device)
+ Metronome timing
+ Full Mixer and Effect for all Drum/Synth pads
+ Drum pad choke groups (4 groups per 8 pads)
+ Audition Browser to load/hot-swap new Drum/Synth kit sounds
+ Expandable Sound Library with Sound expansion packs available on Google Play.
+ Factory Sound Kits (808, 909, Metatronics, various others)

NEW/LOAD/SAVE/EXPORT

+ Create New Project
+ Load Recent/Project
+ Save Project As...
+ Export .pcmsynth preset with MIDI for the Caustic App
+ Export (each Scene/Section as a separate) .wav, .ogg, .mid to your favorite DAW or midi editor
+ Export Song MIDI as one file containing individual channels for each pad 
+ Export Scenes as wav loops zip archived

STEP SEQUENCER

+ Custom Scene color/name
+ Pad loop trigger for remixing live.
+ 63 unique pattern scenes with 1, 2, 4 and 8 measures
+ Pattern 1/16 & 1/8 Swing

PATTERN EDITING

+ Drag n Drop Pad or Scene to Move or Duplicate note data.
+ Clear all Scene data, per pad bank note data or per pad note data
+ Duplicate note data when expanding measure length
+ Arpeggiator note generation with Samplers and Synths (allows for happy accidents)

Plus a lot more... Check out the videos and help documentation

Google Play:
​
https://play.google.com/store/apps/details?id=com.effectone.seqvence

Seqvence is drum machine with step sequencer. You can create drum loops easily by creating drum patterns and combining them into longer sequences. It supports audio samples in wav, aiff and ogg format. 
You are able to store your work, and continue at any time. 
Furthermore, you can export and share your song with friends.

FEATURES

- Step sequencer with 6 channels and 1/32 note resolution

- Note velocity

- Pattern length of up to 4 bars

- 170 internal drum samples

- 20 internal drum kits

- Loads samples from SD card in wav, aiff and ogg format

- Fine tuning sample parameters (volume, panning, pitch, attack and decay)

- 16 bars Pattern sequencer

- 8 available patterns

- Export created loops to ogg or wav format

- Share exported audio

It is for free with no publicity and that is always good, specially if looking for some acid sounds that is bundled together with some drum machines. 

Google Play:
https://play.google.com/store/apps/details?id=com.acid

Realtime emulation of a Roland TB303 synthesizer, TR808 and TR909 drum machines.
Draw in notes, adjust the sound parameters with knobs, auto create random patterns.
High end device required or it will sound like clicks and pops!

Play on your computer as a downloadable Java jar: 
http://bit.ly/2A73L0z

Contribute to the development:
http://github.com/raver1975/Acid

Please go ahead and share your creations with me, because I love acid grooves.

A couple hints:
There are three stacks, the Sequencer stack, the Drum stack, and the Knob stack. Use the little buttons to push to or restore from the stack, or click directly on pattern to discard the top layer.

When the "Free" button is activated, the knobs won't change or record, and the pattern doesn't advance to the next one in the song. You can kind of freestyle it.

Watch out for earburns.

New drum machine.

Play Store info:
https://play.google.com/store/apps/details?id=com.reactable.densitydrums

From music producers to casual users, SNAP will help you create great drum patterns in any musical style, on the fly, with your fingertips. 

SNAP can also help you in the studio, by providing seamless variations of your patterns, under your complete interactive control. Program or load drum patterns, store your favorite variations, and export them to your DAW, all on a continuous and free-flowing loop. 

SNAP is also a powerful tool for your live sessions, providing you with subtle or radical changes, from sudden drops to ecstatic crescendos, all fully and instantaneously controllable under your fingertips. 

SNAP can communicate with your music apps, drum machines, DAWs and other musical equipment via MIDI OUT and Ableton Link ®. SNAP’s full integration with NI’s Maschine Jam ®, allows it to communicate bidirectionally to become its “drumming brain”. Compatibility with other control devices will be rolled-out progressively. 


SNAP can also communicate with your other music apps, drum machines, DAWs and other musical equipment via MIDI OUT and Ableton Link ®. SNAP’s full integration with Native Instruments Maschine Jam ®, allows bidirectional communication with the controller for becoming its “drumming brain”. Compatibility with other control devices will be provided progressively.

SNAP provides the following features:
• 8 continuous density controllers, one for each drum voice.
• 4 different intelligent syncopation/reinforcement algorithms, independently selectable for each drum voice.
• MIDI IN and OUT integration.
• Ableton Link synchronisation support.
• A collection of drum kits, including samples inspired in the most iconic drum machines
• 8 snapshots for storing, recalling and updating drum patterns on the fly.
• A collection of drum patterns covering different styles

For anyone that likes tweakable drum machines and noise it is hard to find something as effective as this on Android...

Google Play:
https://play.google.com/store/apps/details?id=com.thiiird.drgn&pageId=107817317434258015023

WHAT'S NEW

​Minor how-to fix
Added wav file export. Wavs are saved to the home directory under the format drgn_time.wav
Added presets golgotha, concrete, matrix, chainchamber
Fixed bass drum rate error
Fixed append error when overwriting presets

It is not so often lately that there is a new app and concept making an appearance. This looks like one. Have not tried it and am slightly skeptic as it seems more focused on the visual side of things but I could be wrong and it would have been good if they had a demo to try before as it is kind of expensive compared to other android apps.
But they do state that there will be a reduced free version soon.

Google Play:

Mazetools Soniface

EXPLORATION & EXPRESSION
With Mazetools: Soniface you can create various styles of electronic music. Everything based on common aspects of notation and music production. The in-app manual guides you towards a visual music experience.

HOW THE GRID WORKS?
The framework of action is a grid. Each line represents a single note. Shining lines are showing playing tones. 

X-Y CONTROLLERS & MULTI-TOUCH
Use multi-touch gestures for altering sound effects or explore the circular editing interface.

DYNAMIC SOUND MODULATION
Merge sounds and geometric shapes! Draw sound waves and automation curves freely with your finger to modify the sound effects.

GROOVE SEQUENCER
Just tap into the circle to set bass drum, snare and hi-hat steps. Easily adjust envelopes and pitch levels.

RHYTHMICAL MELODIES
Let the grid play a sequence of notes automatically using the arpeggiator interface.

LIVE MODE & SPECIAL VISUALS
Use different patterns to create song variations. Add a special kaleidoscope visual to a pattern as a highlight.

SAVE YOUR CREATIONS
You can store single Mazes, patterns or whole sessions into a set. Add one set into another and extend your playing time.

STAY CURIOUS!
We will bring spaced out updates and a reduced free version soon...

Get more information on:
https://www.mazetools.com/

Do you want to contact us? Visit our company website:
https://ectoplastic.com/WHAT'S NEW- Synthesizer based on an audiovisual grid implying common aspects of notation
- 3 way monophone drum synthesizer with envelope, pitch and noise level control and automation setup
- integrated manual
- unlimited pattern and instrument implementation
- arpeggiator interface, envelope setup & note step sequencer
- special “kaleidoscope” visual to highlight patterns
- full-screen mode
- easy composition playback
- versatile file library

Have been playing with this some days now and it is a cool thing.
It is dirty and different. It is not sample based and comes with a handfull of effects.
The layout is to scroll from the top to the bottom, starting with the bass drum and ending with the effects section.
There is not many drum machines for Android based on synthesized drums so that makes this interesting but what makes it even more interesting is that there is no drum machine that sounds like it either.

​Anyone interested in aggressive noisy sounds or chiptune should definitevely check this out.
Do think that it is also good to have anyway as it fun to tweak and just being different makes it an added possibility that is hard to get to with other apps.
There is a demo that is useful if you want to sit and record into a DAW for example the full version comes with preset saving and soon to come audio recording.

It is made using Pure Data and ported to Android using LibGDX which is the same as the developer working on Pure Data Party apps. It seems to be shortest way for someone that wants to make quality apps but do not have years to spend how to code properly...

The developer is also active musically and you can hear his music here:
https://soundcloud.com/thiiird

Google Play:

Dragon - Synth Drum Machine

Dragon is a drum machine built to quickly and easily make glitch, distorted, lofi drum beats and manipulate them live. The drums are simple and flexible, capable of some classic drum machine sounds and also new weirdness. Each is synthesized in real time and sent to a multi effect rig with variable speed stutter, bit reduction, pitched feedback delay and a resonant bandpass filter. The drums are triggered by a four pattern step sequencer. Patterns can be changed individually for each drum or triggered together for quick pattern switches for all drums.

Features:
Four pattern sequencer with local and global pattern control
BPM control with nudging
Save/load presets
Three drum synths:
-Bass
-Snare
-Hi-hat
Effects rig:
-Asymmetry and tanh(x) for tape like distortion
-Pitched feedback delay
-Retrigger (aka stutter/buffer) with variable speed and reversing
-Bit reduction
-Down-sample
-Reverb
-Resonant bandpass filter

Preset management requires permission for file storage read/write (optional on Android M+)

Unpaid version disables preset saving and audio recording

Audio recording coming soon. Possible future ports to desktop and ios. Made with Pure Data and libGDX

Full parameter and effect reference:

SYNTH PARAMETERS

Bass drum-
Freq: Frequency. Locks into semitones so you an harmonize easily
Decay: Amplitude decay
Freq Env Dec: Frequency envelope decay. Changes how fast the pitch drops
Freq Env Amt: Frequency envelope amount. Changes how much the pitch drops

Snare drum-
Tone Low Dec: Tone low decay
Tone High Dec: Tone high decay
Noise Dec: Noise decay
FM: Frequency modulate the low tone by the high tone
Freq: Frequency. Locks into semitones so you an harmonize easily, though overtones from fm and the high tone bring inharmonic tones
Freq Env: Frequency envelope. Changes how much the pitch drops
Delay: Feedback delay
Delay ms: Milliseconds of delay

Hi-Hat-
Freq: Frequency
FM: Frequency modulate the tone
Tone Dec: Tone decay
Tone Amp: Tone amplitude
Noise Dec: Noise decay
Noise Amp: Tone amplitude

EFFECTS

Retrig: Loop audio by the specified time interval (1/2, 1/8, 1/16, 1/32 notes)
Rev: reverse retrigger’s playback
Speed: control the speed of the retrigger’s playback

Bit Red: Bit reducer. Mixes in a low bit signal
BP Filt: Band-pass filter. All the way left is off
Tanh: Amplifies and the waveshapes the signal through a hyperbolic tangent curve. Creates a tape-like distortion
Asym: Adds to the signal, creating a DC offset. Doesn’t do much unless you have Tanh turned a bit
Down Samp: Down-sample the signal
Reverb: Mixes in reverb signal
Delay: Pitched feedback delay dry/wet
Delay ms: Milliseconds of delay
Freq: Adjust the pitch that the delayed signal is adjusted by. Also locks into semitones

Skarabee a long time user of Caustic have done some music software before but now he took the BeatBox machine from Caustic and made into a VSTi to be loaded up in a DAW.
It would be cool to one day be able to load the whole of Caustic as a plug-in and who knows?
Also his website is full of Caustic resources such as instrument presets skins, samples and suchlike.

Here is what he says and the link to get it:

https://sites.google.com/site/thecausticsessions/skara-plugins

Some users had a dream of a VST version for some Caustic's machines. So I followed this dream and made this extended version of the Beatbox as VSTi. 

Specifications:

•  12 slots
• 6 kits in the initial bundle.
• each slot can be routed to a separate audio channel (stereo)
• reverb included in the first stereo channel
• global pitch 
• Punch, decay, pan, and volume knobs
• Dynamic knob for the global response to velocity
• Multisampled for some kits (differents samples according to velocity)
• Note off message recognized (for embedded reverb samples length)

Kits details:

• Addicted: Taken from acoustic Addictive Drums V1. Multisampled
• Brushcat: one of my first Caustic kit now multisampled in stereo
• GSP rev: 80's style with included reverb (can be adjusted by the length of note) 
• Kaledokit: new one, electronic, modern and punchy (multisamples)
• KNA: another brand new inspired by an hardware machine (add 2 to each letter of his name to guess what)
• ODMX: the original Caustic kit revisited and boosted with tube preamp. some multisamples
• more kits to come...And I also can build a kit from your own samples, if you provide them