# FUEL DENSITY vs Authenticator for Yahoo

The clearest difference is price: Authenticator for Yahoo at Free against FUEL DENSITY's $2.99. FUEL DENSITY's advantage is in-app purchases (none vs 2) and update cadence (every 5 days vs every 11 months). On ads and device support there is nothing between them.

Authenticator for Yahoo is free to download; FUEL DENSITY costs $2.99 up front. Authenticator for Yahoo sells 2 in-app purchases, starting at $3.99 per 7 days. FUEL DENSITY asks for nothing beyond the download.

FUEL DENSITY ships an update every 5 days, Authenticator for Yahoo every 11 months. The most recent releases landed on October 8, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | FUEL DENSITY | Authenticator for Yahoo |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/authenticator-for-yahoo/id6744443225/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Every 11 months |
| Monetization | — | Subscription |
| Size | 2 MB | 115 MB |
| Requires iOS | **15.2** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Oleksii Nezhalskyi](https://appshunter.io/developer/1687730603) | [bili treg](https://appshunter.io/developer/1807737644) |

## What reviewers say

### FUEL DENSITY

[App page](https://appshunter.io/ios/app/fuel-density/id6450055630)

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

**In-app purchases:** none


### Authenticator for Yahoo

[App page](https://appshunter.io/ios/app/authenticator-for-yahoo/id6744443225)

This app provides secure verification codes for Yahoo account logins, adding a crucial second layer of protection. It generates time-based one-time passwords for fast and reliable two-factor authentication, even offline. Manage multiple accounts with ease and ensure your personal information stays safe.

**Highlights:** Secure Yahoo login verification codes, Fast and easy account setup, Reliable time-based one-time passwords (TOTP), Offline code generation, Support for multiple Yahoo accounts, Backup and restore functionality, Clean and simple interface

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Safe Access 2FA (weekly std) | $3.99 | per 7 days |
| Safe Access 2FA (weekly trial) | $3.99 | per 7 days |


## Frequently asked questions

### Is FUEL DENSITY free?

FUEL DENSITY costs $2.99, with no in-app purchases.

### Is Authenticator for Yahoo free?

Authenticator for Yahoo is free to download, with in-app purchases available.

### Do FUEL DENSITY or Authenticator for Yahoo have ads?

Neither FUEL DENSITY nor Authenticator for Yahoo shows ads.

### Which is updated more often, FUEL DENSITY or Authenticator for Yahoo?

FUEL DENSITY ships an update every 5 days, and Authenticator for Yahoo every 11 months. Most recently, FUEL DENSITY was updated on October 8, 2026 and Authenticator for Yahoo on October 6, 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.*