# Compound Interest Calc vs Sparky

Compound Interest Calc and Sparky both sit at 4.6 stars, but that hides the real split: 54% of Compound Interest Calc's written reviews are positive against 0% of Sparky's. Compound Interest Calc also leads on in-app purchases (none vs 1) and iOS requirement (9.0 vs 17.0). Sparky's advantage is price (Free vs $1.99) and update cadence (weekly vs every 8 months). On rating, ratings volume, ads and device support there is nothing between them.

Sparky is free to download; Compound Interest Calc costs $1.99 up front. Sparky sells 1 one-off in-app purchase. Compound Interest Calc asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Compound Interest Calc against 4.7 for Sparky. Both are backed by a comparable volume of ratings — 19 and 7 respectively. Written reviews are what separate them: 54% of Compound Interest Calc's written reviews are positive against 0% of Sparky's.

Compound Interest Calc ships an update every 8 months, Sparky weekly. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Compound Interest Calc | Sparky |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [4.6 (19 ratings)](https://appshunter.io/ios/app/compound-interest-calc/id543747638/reviews) | **[4.7 (7 ratings)](https://appshunter.io/ios/app/sparky-subscriptions-tracker/id1524236599/reviews)** |
| Number of ratings | **19** | 7 |
| Positive reviews | **54.2% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Weekly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 5 MB | 13 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Mobile and Database Solutions](https://appshunter.io/developer/492595032) | [Ryan Rook](https://appshunter.io/developer/1524236601) |

## What reviewers say

### Compound Interest Calc

[App page](https://appshunter.io/ios/app/compound-interest-calc/id543747638)

Calculate compounding interest with customizable options for term length, interest rate, and deposit frequency. View inflation-adjusted results and detailed amortization tables. Supports international currencies and saves all your data.

**Highlights:** Variable term length (years/months), Customizable interest rate, Additional deposit options, Daily/Monthly/Quarterly/Yearly calculation, Inflation-adjusted results, Amortization table with email export, Supports international currencies

**Features:** macOS Compatibility

**In-app purchases:** none


### Sparky

[App page](https://appshunter.io/ios/app/sparky-subscriptions-tracker/id1524236599)

Effortlessly track all your subscriptions and recurring expenses with a clear overview of your finances. This app helps you visualize spending, manage monthly outlays, and make informed decisions to achieve your financial goals faster.

**Highlights:** Visualize subscriptions and expenses, Track recurring costs, Manage monthly outlays, Calculate remaining funds, Simplify expense adding, Gain financial control

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sparky + | $3.99 | one-time |


## Frequently asked questions

### Is Compound Interest Calc free?

Compound Interest Calc costs $1.99, with no in-app purchases.

### Is Sparky free?

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

### Which has better reviews, Compound Interest Calc or Sparky?

Sparky is rated higher. Compound Interest Calc averages 4.6 out of 5 from 19 ratings, while Sparky averages 4.7 from 7 ratings.

### Do Compound Interest Calc or Sparky have ads?

Neither Compound Interest Calc nor Sparky shows ads.

### Which is updated more often, Compound Interest Calc or Sparky?

Compound Interest Calc ships an update every 8 months, and Sparky weekly. Most recently, Compound Interest Calc was updated on November 6, 2026 and Sparky on November 3, 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.*