# Fast Interest Calculator vs Coinpi

The clearest difference is in-app purchases: Fast Interest Calculator at none against Coinpi's 1. Fast Interest Calculator also leads on iOS requirement (12.0 vs 15.1). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Coinpi sells 1 one-off in-app purchase. Fast Interest Calculator asks for nothing beyond the download.

Fast Interest Calculator ships an update every 6 weeks, Coinpi every 3 weeks. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Fast Interest Calculator | Coinpi |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Size | 51 MB | 26 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Camilo Ortegon](https://appshunter.io/developer/993583183) | [Alder Dario Velasquez Obando](https://appshunter.io/developer/1805461885) |

## What reviewers say

### Fast Interest Calculator

[App page](https://appshunter.io/ios/app/fast-interest-calculator/id6475480484)

**Features:** macOS Compatibility

**In-app purchases:** none


### Coinpi

[App page](https://appshunter.io/ios/app/coinpi-expense-tracker/id6743998300)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coinpi + | $1.99 | one-time |


## Frequently asked questions

### Is Fast Interest Calculator free?

Fast Interest Calculator is free to download, with no in-app purchases.

### Is Coinpi free?

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

### Do Fast Interest Calculator or Coinpi have ads?

Neither Fast Interest Calculator nor Coinpi shows ads.

### Which is updated more often, Fast Interest Calculator or Coinpi?

Fast Interest Calculator ships an update every 6 weeks, and Coinpi every 3 weeks. Most recently, Fast Interest Calculator was updated on October 27, 2026 and Coinpi on October 28, 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.*