# Trigonometric Equations vs ODE

The clearest difference is update cadence: ODE at monthly against Trigonometric Equations's every 20 months. Trigonometric Equations's advantage is price ($0.99 vs $1.99) and iOS requirement (9.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

Trigonometric Equations costs $0.99 and ODE $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Trigonometric Equations ships an update every 20 months, ODE monthly. The most recent releases landed on September 21, 2026 and August 16, 2026 respectively.

## The numbers

| Metric | Trigonometric Equations | ODE |
| --- | --- | --- |
| Price | **$0.99** | $1.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 20 months | **Monthly** |
| Size | 10 MB | 37 MB |
| Requires iOS | **9.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [FadiSoft Inc.](https://appshunter.io/developer/721334526) | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) |

## What reviewers say

### Trigonometric Equations

[App page](https://appshunter.io/ios/app/trigonometric-equations/id927622565)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### ODE

[App page](https://appshunter.io/ios/app/ode-solver-integrator-pro/id1619296409)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Trigonometric Equations free?

Trigonometric Equations costs $0.99, with no in-app purchases.

### Is ODE free?

ODE costs $1.99, with no in-app purchases.

### Do Trigonometric Equations or ODE have ads?

Neither Trigonometric Equations nor ODE shows ads.

### Which is updated more often, Trigonometric Equations or ODE?

Trigonometric Equations ships an update every 20 months, and ODE monthly. Most recently, Trigonometric Equations was updated on September 21, 2026 and ODE on August 16, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*