Comparison

AirChord vs Graph Calc Plus

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

AirChord

Stream audio wirelessly to AirPlay and Bluetooth speakers. This app also introduces internet streaming, allowing you to save and replay audio sessions on demand, creating a personal audio station.

Highlights
  • Wireless audio streaming
  • AirPlay and Bluetooth speaker support
  • Internet streaming
  • Save and replay audio sessions
  • Personal audio station
Features
Read full description

Everything's new in AirChord 3. The app has been rebuilt to be faster, smoother, and more powerful. Stream to AirPlay and Bluetooth speakers like before, plus a brand new feature: Internet streaming. Now you can save your turntable sessions and replay them on-demand. It's your personal vinyl radio station.

About

Graph Calc Plus

Features
Read full description

Graph Calculator define the graph of [f] to be the graph of the equation y = f(x). So, the graph of a function if a special case of the graph of an equation. Features: ∙ Set individual line color. ∙ Show/Hide individual mathematical expression. ∙ Pinch to Zoom in/out Graph View. ∙ Pan to reposition Graph View. ∙ Add up to 22 mathematical expressions. ∙ Full screen preview. Graph Features: ∙ Custom background color for Graph. ∙ Custom grid color for Graph. ∙ Show/Hide Grid Lines/Minor Grid Lines. ∙ Show/Hide Axis Number. ∙ Show/Hide X-Axis. ∙ Show/Hide Y-Axis. ∙ Set Graph Line Width range from 0.5~5.0. Some of the most commonly used functions: y = mx + b y = x**2 [x²] y = x**3 [x³] y = sqrt(x) [√x] y = ln(x) y = log(x) y = sin(x) y = cos(x) y = tan(x) Standard Operators: + - addition and unary positive - - subtraction and negation * - multiplication / - division ! - factorial ** - pow, exponentiation sqrt(x) - square root cuberoot(x) - cubic root Standard parameters (constant): phi - returns the value of ϕ (the Golden Ratio). Also recognized as ϕ() pi - returns the value of π. Also recognized as π() pi_2 - returns the value of π/2 pi_4 - returns the value of π/4 tau - returns the value of τ. Also recognized as τ() sqrt2 - returns the value of the square root of 2 e - returns the value of e log2e - returns the value of the log base 2 of e log10e - returns the value of the log base 10 of e ln2 - returns the value of the log base e of 2 ln10 - returns the value of the log base e of 10 Standard Functions that take 1 parameter: sqrt() - returns the square root of the passed parameter log() - returns the base 10 log of the passed parameter ln() - returns the base e log of the passed parameter log2() - returns the base 2 log of the passed parameter ceil() - returns the passed parameter rounded up floor() - returns the passed parameter rounded down Trigonometric functions: sin(), cos(), tan() Their inverses (asin, acos, atan, atan2) Their reciprocals (csc, sec, cotan) The reciprocals of the inverses (acsc, asec, acotan) The hyperbolic variations of all the above functions (sinh, cosh, tanh, asinh, acosh, atanh, csch, sech, cotanh, acsch, asech, acotanh) The versine functions (versin, vercosin, coversin, covercosin, haversin, havercosin, hacoversin, hacovercosin, exsec, excsc, crd) dtor() - converts the passed parameter from degrees to radians rtod() - converts the passed parameter from radians to degrees Quick Start: 1. Tap on [+] button. 2. Change the equation of the line to y=3x+1 and see graphed. 3. You can also enter equations that are not solved for x e.g. x=2y+2 About Graph Calculator In mathematics, the graph of a function f is the set of ordered pairs (x,y), where f(x)=y. In the common case where x and f(x) are real numbers, these pairs are Cartesian coordinates of points in two-dimensional space and thus form a subset of this plane. Thanks for your support and do visit nitrio.com for more apps for your iOS devices.

Screenshots

AirChord4 screens
Graph Calc Plus4 screens

Verdict

The call

The clearest difference is price: AirChord at Free against Graph Calc Plus's $2.99. AirChord also leads on update cadence (every 5 months vs every 39 months). Graph Calc Plus's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

AirChord is free to download; Graph Calc Plus costs $2.99 up front. AirChord sells 2 one-off in-app purchases. Graph Calc Plus asks for nothing beyond the download.

UpkeepUpdate frequency

AirChord ships an update every 5 months, Graph Calc Plus every 39 months. The most recent releases landed on September 19, 2026 and December 13, 2025 respectively.

Scorecard3 real differences · 7 level
AirChord versus Graph Calc Plus: the parameters behind the verdict, then further details
ParameterAirChordGraph Calc Plus
PriceFree — better$2.99
Rating4.6 (99 ratings) — better—
Positive reviews81.6% of reviews—
Number of ratings99 — better—
Update frequencyEvery 5 months — betterEvery 39 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.514.0 — better
Further details — not scored
Size65 MB1 MB
Age rating4+4+
DeveloperKevin KellyHeng Jia Liang

Bugs and requests

AirChord

Reported bugs

24 issues
  • Sound drops since last update
  • App crashes frequently
  • Audio connection sometimes fails
  • Does not work with Sonos USB-C adapter
  • No input selection available
Show 19 more
  • Only picks up microphone audio
  • Limited to Airplay 1
  • Can only select one HomePod
  • Voiceover audio is passed through to output
  • Does not work on multiple Airplay speakers
  • Lowest volume setting is still loud
  • Only streams a single channel of audio
  • 3 to 4 seconds delay between sound and image
  • Requires additional adapters
  • Stereo not supported unless using tricks
  • Missing Airplay 2 support
  • Not good for watching TV or playing video games
  • Setup can be tricky
  • Requires external ADC
  • No input select
  • Doesn't switch from mic to 1/8” Jack automatically
  • Seems this no longer works with a turntable that has USB B
  • Stuttering sound since last update
  • Sound drops

Requested features

10 requests
  • Expand album art to full screen
  • Album art visualiser
  • Improve Siri integration for output selection
  • Support for multi-speaker Airplay 2
  • Add Airplay 2 support for stereo pairs
Show 5 more
  • Add input meter
  • Large portrait volume control with output levels
  • Support stereo pairs for HomePods
  • Full Airplay 2 support
  • Update for stereo pairs

Graph Calc Plus

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

AirChord

One-time2
  • $0.99 tip$0.99
  • $9.99 tip$9.99
None

Graph Calc Plus

No in-app purchases

Questions

Is AirChord free?
AirChord is free to download, with in-app purchases available.
Is Graph Calc Plus free?
Graph Calc Plus costs $2.99, with no in-app purchases.
Do AirChord or Graph Calc Plus have ads?
Neither AirChord nor Graph Calc Plus shows ads.
Which is updated more often, AirChord or Graph Calc Plus?
AirChord ships an update every 5 months, and Graph Calc Plus every 39 months. Most recently, AirChord was updated on September 19, 2026 and Graph Calc Plus on December 13, 2025.

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