# OASA vs Mercury

The clearest difference is rating: Mercury at 4.5 against OASA's 2.7. Mercury also leads on review sentiment (36% vs 14%) and ratings volume (25 vs 3). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Mercury holds the better App Store score, 4.5 against 2.7. That said, the two scores are not equally well evidenced: Mercury has 25 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 14% of OASA's written reviews are positive against 36% of Mercury's.

Both ship on a similar rhythm, roughly every 2 weeks. Both last shipped on October 11, 2026.

## The numbers

| Metric | OASA | Mercury |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (3 ratings)](https://appshunter.io/ios/app/oasa/id1104863353/reviews) | **[4.5 (25 ratings)](https://appshunter.io/ios/app/mercury-e/id6472804499/reviews)** |
| Number of ratings | 3 | **25** |
| Positive reviews | 13.8% of reviews | **36.1% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free | Free |
| Size | 35 MB | 106 MB |
| Requires iOS | 17.5 | **15.6** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Advanced Transport Telematics S.A.](https://appshunter.io/developer/1104863352) | [SIA ATOM Tech](https://appshunter.io/developer/1453550254) |

## What reviewers say

### OASA

[App page](https://appshunter.io/ios/app/oasa/id1104863353)

Get real-time bus information for Athens, including routes, schedules, and nearby stops. Navigate to stops using your preferred map app and receive important news updates via push notifications.

**Highlights:** Real-time bus tracking, Nearby stop finder, Route and schedule viewing, Push notifications for news, Two-language support, Favorite lines and stops, Apple Watch integration

**Features:** Apple Watch app

**In-app purchases:** none


### Mercury

[App page](https://appshunter.io/ios/app/mercury-e/id6472804499)

Easily rent and ride electric bikes across Greece. Scan a QR code to unlock a bike and return it to a designated spot to end your rental and charge.

**Highlights:** Thousands of bikes nationwide, QR code unlocking, Designated parking spots, High-quality vehicles, Easy rental process

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

**In-app purchases:** none


## Frequently asked questions

### Is OASA free?

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

### Is Mercury free?

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

### Which has better reviews, OASA or Mercury?

Mercury is rated higher. OASA averages 2.7 out of 5 from 3 ratings, while Mercury averages 4.5 from 25 ratings.

### Do OASA or Mercury have ads?

Neither OASA nor Mercury shows ads.

### Which is updated more often, OASA or Mercury?

OASA ships an update every 2 weeks, and Mercury every 2 weeks. Most recently, OASA was updated on October 11, 2026 and Mercury on October 11, 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.*