Comparison

Sunlux Powerbox 2 vs Contraction Timer

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

Head to head
About

Sunlux Powerbox 2

Features
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With the Sunlux Powerbox 2 app, you get access to all essential operating information about your battery and can easily monitor its status, such as voltage, state of charge, remaining runtime, and time to full charge. The app also features Multiconnect support, allowing you to connect multiple batteries simultaneously and view aggregated operating data. The Sunlux Powerbox 2 app is compatible with the following battery models: Sunlux Powerbox 100Ah & 160Ah (>07/2022) Sunlux Powerbox Plus 105Ah, 150Ah, 180Ah & 330Ah

About

Contraction Timer

Features
Read full description

Contraction Timer by Wavely helps you track your contractions easily and accurately during labor. When contractions start, timing them is one of the most important things you can do. Contraction Timer makes it simple – just tap to start and stop, and the app does the rest. FEATURES • One-tap timing – start and stop with a single tap • Automatic tracking of duration, frequency and intervals • Clear overview of your contraction history • Know when to go to the hospital based on the 5-1-1 rule • Clean, calm design for stressful moments • Share your contraction log with your partner or midwife WHEN TO USE • When you feel your first contractions • To distinguish real labor from Braxton Hicks • To track patterns and know when to head to the hospital Designed by parents, for parents. Simple, reliable, and there when you need it most. Download now and be ready for the big day!

Screenshots

Sunlux Powerbox 24 screens
Contraction Timer4 screens

Verdict

The call

The clearest difference is in-app purchases: Sunlux Powerbox 2 at none against Contraction Timer's 1. Sunlux Powerbox 2 also leads on iOS requirement (12.0 vs 17.0). Contraction Timer's advantage is update cadence (every 3 weeks vs every 4 months). On price, ads and device support there is nothing between them.

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

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

Both are free to download. Contraction Timer sells 1 one-off in-app purchase. Sunlux Powerbox 2 asks for nothing beyond the download.

UpkeepUpdate frequency

Sunlux Powerbox 2 ships an update every 4 months, Contraction Timer every 3 weeks. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

Scorecard3 real differences Ā· 3 level
Sunlux Powerbox 2 versus Contraction Timer: the parameters behind the verdict, then further details
ParameterSunlux Powerbox 2Contraction Timer
PriceFreeFree
Update frequencyEvery 4 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better17.0
Further details — not scored
Size35 MB3 MB
Age rating17+4+
DeveloperSUNLUX SwedenSALEH MUSTAFA

In-app purchases

None

Sunlux Powerbox 2

No in-app purchases

1 purchases

Contraction Timer

One-time1
  • Wavely Premium$2.99

Questions

Is Sunlux Powerbox 2 free?
Sunlux Powerbox 2 is free to download, with no in-app purchases.
Is Contraction Timer free?
Contraction Timer is free to download, with in-app purchases available.
Do Sunlux Powerbox 2 or Contraction Timer have ads?
Neither Sunlux Powerbox 2 nor Contraction Timer shows ads.
Which is updated more often, Sunlux Powerbox 2 or Contraction Timer?
Sunlux Powerbox 2 ships an update every 4 months, and Contraction Timer every 3 weeks. Most recently, Sunlux Powerbox 2 was updated on October 27, 2026 and Contraction Timer on October 25, 2026.

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