Plotter vs iTurbo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Plotter
Easily plot graphs of mathematical functions by entering formulas and specifying a range. Supports multiple functions and offers interactive chart themes. Share your plots via email.
- Plot graphs of functions
- Enter formulas and specify range
- Plot multiple functions
- Interactive chart themes
- Email charts and formulas
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Plot graphs of functions. Enter your formula and the range you want to plot. Features: - By separating the formulas with semicolons you can draw more than one function. - Turn the phone to quickly jump between graph and formula. - Tap the chart to flip through the themes. - E-Mail the formulas, charts and let others open them in the plotter web application.
iTurbo
This app simulates fluid dynamics by solving Navier-Stokes equations for 2D incompressible turbulence. It uses a direct numerical simulation method with Euler time stepping and Fourier space calculations for efficiency.
- Direct Numerical Simulation (DNS)
- Navier-Stokes equation solver
- 2D incompressible turbulence
- Euler time stepping
- Fourier space calculations
- Vorticity field transformation
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This application performs a Direct Numerical Simulation (DNS) where the Navier-Stokes equations are solved for two dimensional incompressible homogeneous turbulence. These equations are a set of nonlinear partial differential equations. The time stepping is performed with a simple Euler method where the time step is calculated so that the CFL number does not exceeds the given number (should be less than 0.8 otherwise the simulation blows up). The equations are solved in the Fourier space where the calculation of the nonlinear term transforms to a simple multiplication. The main CPU usage is consumed by transforming the vorticity field back and fourth between the Normal space where the time-stepping is performed and the Fourier space where the nonlinear term is calculated.
Screenshots
Verdict
The clearest difference is price: iTurbo at Free against Plotter's $0.99. iTurbo also leads on rating (5.0 vs 1.0). Plotter's advantage is update cadence (every 7 months vs every 54 months) and iOS requirement (11.0 vs 18.0). On ratings volume, ads, in-app purchases and device support 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
iTurbo is free to download; Plotter costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
iTurbo holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
Plotter ships an update every 7 months, iTurbo every 54 months. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.
| Parameter | Plotter | iTurbo |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 1.0 (2 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 7 months — better | Every 54 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 11.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 1 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Piet Jonas | ManneTroll Solutions |
Customer experience
Plotter
iTurbo
In-app purchases
Plotter
No in-app purchases
iTurbo
No in-app purchases
