Comparison

Polnav BT bridge vs ETA321

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Polnav BT bridge

Read full description

Polnav BT bridge combines Bluetooth transmission to easily transfer destinations found on cell phones to Polnav on your In-Vehicle Infotainment System, in the same way that people are used to using cell phones. The integration of Polnav BT bridge technology makes Polnav more convenient and extensive to use without any additional burden. Features ◎ Your phone is no longer occupied by navigation With Polnav BT bridge, you can simply transfer information of your destination to Polnav on your In-Vehicle Infotainment System in three steps and you are ready to go, so your cell phone will not be occupied by navigation for a long time during the journey. ◎ No more being bothered by the input method No matter you are accustomed to using text or voice input on your cell phone, Polnav BT bridge helps you to connect your cell phone to Polnav as soon as you find your destination in Apple Maps or Google Maps. ◎ No need to wait for navigation map updates Take advantage of Apple Maps and Google Maps to update maps in time, no worries on not able to find latest attractions. ◎ No need to get familiar with new navigation software You don't need to learn how to navigate when you buy a new car, Polnav can also provide you with the best route. **Note** The In-Vehicle Infotainment System needs to have Polstar navigation software installed and supports BLE (Bluetooth Low Energy). To check whether your navigation supports Polnav BT bridge, please check [Main Menu] > [Information] > [About] , or with your car dealer for more information. Customer Service:support_team@polstargps.com

About

ETA321

Features
Read full description

ETA321 為香港公共交通而設,將港鐵、城巴及九巴的公開 ETA 資料,轉化為更清晰、更易掌握的分秒預估倒數。見到下一班仲有 7 分鐘,先後悔行慢咗?ETA321 讓你不只看見「7 分鐘」,而是更直觀地掌握剩餘時間,幫助你判斷應否趕車、候車或準備轉乘。 功能包括: (1) 港鐵分秒 ETA 預估倒數; (2) 港鐵路線地圖及列車位置推算; (3) 城巴及九巴路線到站預估; (4) iPhone 鎖定畫面及動態島 Live Activity。 ETA321 會以公開資料更新作為參考,提供穩定易讀的倒數體驗。所有到站時間及分秒倒數均屬預估資訊,請以營辦商官方公告及現場資訊為準。

Screenshots

Polnav BT bridge4 screens
ETA3214 screens

Verdict

The call

The clearest difference is update cadence: ETA321 at weekly against Polnav BT bridge's every 2 months. Polnav BT bridge's advantage is iOS requirement (11.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Polnav BT bridge ships an update every 2 months, ETA321 weekly. The most recent releases landed on October 25, 2026 and October 12, 2026 respectively.

Scorecard2 real differences · 4 level
Polnav BT bridge versus ETA321: the parameters behind the verdict, then further details
ParameterPolnav BT bridgeETA321
PriceFreeFree
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPad
Requires iOS11.0 — better17.0
Further details — not scored
Size5 MB10 MB
Age rating4+4+
DeveloperPolstar Technologies Inc.Wing Leung Wong

In-app purchases

None

Polnav BT bridge

No in-app purchases

None

ETA321

No in-app purchases

Questions

Is Polnav BT bridge free?
Polnav BT bridge is free to download, with no in-app purchases.
Is ETA321 free?
ETA321 is free to download, with no in-app purchases.
Do Polnav BT bridge or ETA321 have ads?
Neither Polnav BT bridge nor ETA321 shows ads.
Which is updated more often, Polnav BT bridge or ETA321?
Polnav BT bridge ships an update every 2 months, and ETA321 weekly. Most recently, Polnav BT bridge was updated on October 25, 2026 and ETA321 on October 12, 2026.

Other comparisons