# Exponential Growth Decay PRO vs 小教练

The clearest difference is price: 小教练 at Free against Exponential Growth Decay PRO's $1.99. 小教练 also leads on update cadence (every 3 days vs monthly). Exponential Growth Decay PRO's advantage is in-app purchases (none vs 1) and device support (3 vs 1). On ads there is nothing between them.

小教练 is free to download; Exponential Growth Decay PRO costs $1.99 up front. 小教练 sells 1 one-off in-app purchase. Exponential Growth Decay PRO asks for nothing beyond the download.

Exponential Growth Decay PRO ships an update monthly, 小教练 every 3 days. The most recent releases landed on November 10, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Exponential Growth Decay PRO | 小教练 |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Monetization | Paid | — |
| Size | 180 MB | 3 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) | [deng yongyuan](https://appshunter.io/developer/1156541656) |

## What reviewers say

### Exponential Growth Decay PRO

[App page](https://appshunter.io/ios/app/exponential-growth-decay-pro/id1662901853)

Calculate future values using exponential growth and decay functions. Input starting and resulting values, growth factor, rate, or percentage to find missing variables. Visualize results with graphs and infographics, with step-by-step solutions.

**Highlights:** Calculate growth factor, rate, or percentage, Step-by-step solution display, Graph visualization of functions, Infographic parameter explanation, History of calculations, Support for decimals, fractions, and negative values

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

**In-app purchases:** none


### 小教练

[App page](https://appshunter.io/ios/app/id6809406925)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 小教练 Pro | $4.99 | one-time |


## Frequently asked questions

### Is Exponential Growth Decay PRO free?

Exponential Growth Decay PRO costs $1.99, with no in-app purchases.

### Is 小教练 free?

小教练 is free to download, with in-app purchases available.

### Do Exponential Growth Decay PRO or 小教练 have ads?

Neither Exponential Growth Decay PRO nor 小教练 shows ads.

### Which is updated more often, Exponential Growth Decay PRO or 小教练?

Exponential Growth Decay PRO ships an update monthly, and 小教练 every 3 days. Most recently, Exponential Growth Decay PRO was updated on November 10, 2026 and 小教练 on October 31, 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.*