# Desmos Test Mode vs Implicit Differentiation Cal

The clearest difference is update cadence: Desmos Test Mode at every 4 months against Implicit Differentiation Cal's every 9 months. Implicit Differentiation Cal's advantage is iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Desmos Test Mode ships an update every 4 months, Implicit Differentiation Cal every 9 months. The most recent releases landed on September 10, 2026 and December 5, 2025 respectively.

## The numbers

| Metric | Desmos Test Mode | Implicit Differentiation Cal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.6 (368 ratings)](https://appshunter.io/ios/app/desmos-test-mode/id977381005/reviews)** | — |
| Number of ratings | **368** | — |
| Positive reviews | 16.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 9 months |
| Monetization | Free | — |
| Size | 6 MB | 24 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Desmos](https://appshunter.io/developer/653517543) | [Ahmad Sattar](https://appshunter.io/developer/1458483953) |

## What reviewers say

### Desmos Test Mode

[App page](https://appshunter.io/ios/app/desmos-test-mode/id977381005)

This app provides restricted versions of graphing and scientific calculators designed to meet exam requirements. It allows users to practice for specific state or national assessments by selecting the appropriate test mode. Full, unrestricted calculator features are available in separate applications.

**Highlights:** Exam-compliant calculator modes, Graphing capabilities, Scientific calculator functions, Data tables and statistics, Interactive sliders, Points of interest on graphs

**In-app purchases:** none

**What reviewers like**

- 🚀 Useful app for tests
- 🔒 Secure calculator mode
- 👍 Free alternative to expensive calculators

**What reviewers complain about**

- 🐛 Buggy and unstable
- 🔒 Overly restrictive app lock
- 👎 Poor user interface and usability

**Reported bugs**

- App crashes and freezes during use
- Unexpected phone behavior and lockouts
- Compatibility issues across different devices and OS versions

**Requested features**

- Add customization options for the calculator interface
- Improve compatibility with older devices
- Provide more flexible calculator modes during tests


### Implicit Differentiation Cal

[App page](https://appshunter.io/ios/app/implicit-differentiation-cal/id1607963477)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Desmos Test Mode free?

Desmos Test Mode is free to download, with no in-app purchases.

### Is Implicit Differentiation Cal free?

Implicit Differentiation Cal is free to download, with no in-app purchases.

### Do Desmos Test Mode or Implicit Differentiation Cal have ads?

Neither Desmos Test Mode nor Implicit Differentiation Cal shows ads.

### Which is updated more often, Desmos Test Mode or Implicit Differentiation Cal?

Desmos Test Mode ships an update every 4 months, and Implicit Differentiation Cal every 9 months. Most recently, Desmos Test Mode was updated on September 10, 2026 and Implicit Differentiation Cal on December 5, 2025.

---

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