# Ring Sizer vs FuelFlow

The clearest difference is in-app purchases: FuelFlow at none against Ring Sizer's 3. FuelFlow also leads on iOS requirement (15.0 vs 17.0). Ring Sizer's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Both are free to download. Ring Sizer sells 3 in-app purchases, starting at $3.99 per 7 days. FuelFlow asks for nothing beyond the download.

Ring Sizer ships an update every 3 weeks, FuelFlow every 2 months. The most recent releases landed on October 8, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Ring Sizer | FuelFlow |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (35 ratings)](https://appshunter.io/ios/app/ring-sizer-ring-measure/id6739887211/reviews)** | — |
| Number of ratings | **35** | — |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | — |
| Size | 29 MB | 75 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Ramkumar Vellaisamy](https://appshunter.io/developer/1706335914) | [FuelFlow, LLC](https://appshunter.io/developer/1855867400) |

## What reviewers say

### Ring Sizer

[App page](https://appshunter.io/ios/app/ring-sizer-ring-measure/id6739887211)

Instantly determine your precise ring size for online shopping, custom orders, or gift purchases. Offers multiple international sizing standards and saves your measurements for future use. Get accurate results with clear, step-by-step instructions.

**Highlights:** Instant ring size measurement, Support for multiple international sizing standards, Save and access size history, Step-by-step measurement guidance, Measure for custom ring widths

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ring Sizer Weekly | $3.99 | per 7 days |
| Ring Sizer Yearly | $9.99 | per year |
| Ring Sizer Lifetime | $19.99 | one-time |


### FuelFlow

[App page](https://appshunter.io/ios/app/fuelflow/id6755723484)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Ring Sizer free?

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

### Is FuelFlow free?

FuelFlow is free to download, with no in-app purchases.

### Do Ring Sizer or FuelFlow have ads?

Neither Ring Sizer nor FuelFlow shows ads.

### Which is updated more often, Ring Sizer or FuelFlow?

Ring Sizer ships an update every 3 weeks, and FuelFlow every 2 months. Most recently, Ring Sizer was updated on October 8, 2026 and FuelFlow on October 13, 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.*