Comparison

via vs Battery Duo

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

Head to head
About

via

Features
Read full description

You wish to make on-site changes to your viasis or viacount II device? Or you wish to read your measured data and make evaluations locally? No problem! Simply install the via app on your iPhone and connect via Bluetooth. All settings can be easily executed and transferred to the devices.

About

Battery Duo

Features
Read full description

Battery Duo shows the battery of your Apple Watch and your iPhone at the same time on the watch face – one glance at your wrist is enough. 3 IN 1 – SAVES SPACE The outer ring shows the iPhone's battery, the inner ring the watch's, and the middle shows weekday and date. Three pieces of information in just one complication – so the other slots on your watch face stay free for what else matters to you. THIS IS HOW IT LOOKS β€’ Double ring with date: iPhone outside, watch inside (or the other way around), weekday and date in the middle β€’ Numbers with symbol, numbers only, rings or bars – you choose β€’ Colored by level: green, yellow, red – limits freely adjustable β€’ Lightning bolt while charging, gray display when a value is outdated ALWAYS UP TO DATE β€’ The watch regularly fetches the iPhone's battery level in the background β€’ Turbo update: a ready-made Shortcut and a few automations send the value each time you use your iPhone, charge it, or the battery drops below a 5% step NOTIFICATIONS β€’ Watch or iPhone fully charged – time to unplug β€’ Low battery – time to charge β€’ Watch battery as a number on the iPhone app icon EASY TO SET UP β€’ All settings on iPhone and watch – changes apply immediately on both β€’ Complication for round, rectangular and corner slots as well as the text line UNLOCKING Yearly subscription: 3 days free, then €9.99 per year, renews automatically, cancel anytime. Or a one-time purchase of €29.99 for good, no subscription. Both unlock all features: iPhone battery on the watch and in the complication, notifications when full and nearly empty, battery number on the app icon, Turbo update. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://bertramplischke.github.io/batterie-duo/datenschutz.html Note: iOS reports battery levels to apps in 5% steps; small differences from the status bar are normal. Made with love in BrΓ€unrode.

Screenshots

via4 screens
Battery Duo4 screens

Verdict

The call

The clearest difference is in-app purchases: via at none against Battery Duo's 2. Battery Duo's advantage is update cadence (daily vs weekly). On price, ads, device support and iOS requirement there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Battery Duo sells 2 in-app purchases, starting at $8.99 per year. via asks for nothing beyond the download.

UpkeepUpdate frequency

via ships an update weekly, Battery Duo daily. The most recent releases landed on November 4, 2026 and November 10, 2026 respectively.

Scorecard2 real differences Β· 4 level
via versus Battery Duo: the parameters behind the verdict, then further details
ParameterviaBattery Duo
PriceFreeFree
Update frequencyWeeklyDaily β€” better
AdsNoNo
In-app purchasesNo β€” betterYes
DevicesiPhone, iPadiPhone, Apple Watch
Requires iOS17.617.0 β€” better
Further details β€” not scored
Size85 MB3 MB
Age rating17+4+
Developervia traffic controlling gmbhBertram Gotz Plischke

In-app purchases

None

via

No in-app purchases

2 purchases

Battery Duo

Subscriptions1
  • Jahresabo3 Days trial$8.991 Year
One-time1
  • Einmal kaufen$24.99

Questions

Is via free?
via is free to download, with no in-app purchases.
Is Battery Duo free?
Battery Duo is free to download, with in-app purchases available.
Do via or Battery Duo have ads?
Neither via nor Battery Duo shows ads.
Which is updated more often, via or Battery Duo?
via ships an update weekly, and Battery Duo daily. Most recently, via was updated on November 4, 2026 and Battery Duo on November 10, 2026.

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