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There's a lot of calculator apps out there, but I'm looking for something that

  • works offline
  • is ad-free
  • supports bracketing (i.e. 3*(2+5))
  • has the usual functionality like exponation x^y
  • has a few constants, mainly π and e
  • has at least one logarithm
  • nice to have:
    • trigonometry
    • complex analysis
    • plotting
    • is free

EDIT:

I'm about to extract the firmware of my TI-89+ and use that in graph 89, which is free as in beer and freedom, but emulating a "buttoned" calculator seems like a mediocre solution.

  • So by looking for something "ad free" I'm guessing you're ok with paying for this app? – New-To-IT Jan 5 '16 at 14:09
  • @New-To-IT in practice, yes. Not about to spend USD 10 or more, but if it's a fine calculator, then spending USD 3 doesn't sound bad. – Marcus Müller Jan 5 '16 at 14:14
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    I recommend taking a look at my list of Pocket calculators. The top-one might match your needs for just ~EUR 1.25 (only required permission: "vibrate"). Don't know about the feature-matches – but you could use the app search to limit the list to "calculators not requiring Internet" :) – Izzy Jan 5 '16 at 14:49
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I recommend RealCalc Plus.

Here's the direct link to the app page on Google Play, and a brief description:

RealCalc is designed to look and operate exactly like a real hand-held calculator. It has all the standard scientific functions plus history, memories, unit conversions and constants. You can choose from a number of display styles and formats. It also supports binary, octal and hexadecimal calculations and has an optional RPN mode. RealCalc is easy to use, but has full help included in the app.

The pro version RealCalc Plus has lots of extra features including fractions, degrees/minutes/seconds, customizable conversions and constants, landscape mode, a home-screen widget, a 12-digit display and greater internal precision.

It matches all your must-have requirements and it's well within your 10 USD budget. It's a pretty popular app, it has good reviews and it's updated regularly.

Here are a couple of screenshots from the website:

RealCalc Plus 1

RealCalc Plus 2

The full list of features and more screenshots are available if you follow the links provided above.

  • I'm giving this an upvote, but it's not really what I'm looking for; it's really just an emulation of the user interface of a classical calculator, and at this, my emulated TI-89+ is really more impressive. – Marcus Müller Jan 5 '16 at 20:04

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