Comparison

SEM vs Dead Man Switch

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

Head to head
About

SEM

This utility app monitors your household power consumption in real-time, providing historical data and comparisons to help you save on electricity bills. It supports managing multiple devices and customizing electricity fee calculations.

Highlights
  • Real-time power usage monitoring
  • Historical energy use tracking
  • Second-to-second, day-to-day, week-to-week, month-to-month, and year-to-year comparisons
  • Electricity fee gradient calculation
  • Customizable fee templates
  • Multiple device management
Read full description

SEM‑Meter is a smart energy monitor that installs directly in your power distribution box. It continuously tracks your household electricity consumption and delivers real‑time usage data straight to you—so you always know exactly what’s drawing power. Beyond live monitoring, SEM‑Meter offers powerful insights to help you manage energy more intelligently: Historical analysis – Review past usage patterns and identify conservation opportunities. Multi‑timeframe comparisons – Compare consumption second by second, day by day, week by week, month by month, and year over year. Bill savings – With clear visibility into your habits, you can make informed changes that lower your monthly electricity costs. Customizable tariff calculator – Includes a built‑in electricity fee gradient template, fully adjustable to match your local rate structure. Multi‑device management – Add and bind multiple SEM‑Meters to a single account, enabling unified monitoring and control across multiple properties or expanded setups. Whether you're an eco‑conscious homeowner or managing a growing portfolio, SEM‑Meter gives you the data and flexibility to take full command of your energy future.

About

Dead Man Switch

Features
Read full description

Dead Man Switch (DMS) is your reliable personal safety companion and automated emergency dispatch system. Whether you are traveling solo, working in hazardous environments, living alone, or wanting digital peace of mind, DMS ensures that your trusted contacts receive vital messages and instructions if you ever fail to check in. KEY FEATURES: • 1-Tap Check-In: Confirm your safety effortlessly with our intuitive Check-In Orb before your timer expires. • Flexible Safety Intervals: Customize switch countdown timers (e.g., 12 hours, 24 hours, 7 days) to fit your daily routine or travel plans. • 24/7 Cloud Dispatch: Cloud Edge infrastructure monitors your schedule continuously. Even if your phone runs out of battery, loses connection, or is damaged, your emergency alerts will be dispatched reliably. • Trusted Emergency Contacts: Configure primary and secondary contacts with custom emergency notifications and attached notes. • Biometric & Zero-Trust Security: Protect your data and messages with Face ID / Touch ID and strict cloud Row-Level Security (RLS). Never leave your loved ones in the dark. Protect what matters most with Dead Man Switch. ---------------------------------------- SUBSCRIPTION & LEGAL INFORMATION: • Payment will be charged to your Apple ID account at confirmation of purchase. • Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current billing period. • Your account will be charged for renewal within 24-hours prior to the end of the current period. • You can manage and cancel your subscriptions by going to your App Store Account Settings after purchase. • Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ • Terms of Service: https://dms-termsofservice.quyetnv.info.vn/ • Privacy Policy: https://dms-policy.quyetnv.info.vn/

Screenshots

SEM3 screens
Dead Man Switch4 screens

Verdict

The call

The clearest difference is in-app purchases: SEM at none against Dead Man Switch's 1. Dead Man Switch's advantage is update cadence (every 4 days vs every 2 weeks). On price, ads, device support and iOS requirement 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. Dead Man Switch sells 1 in-app purchase, starting at $4.99 per year. SEM asks for nothing beyond the download.

UpkeepUpdate frequency

SEM ships an update every 2 weeks, Dead Man Switch every 4 days. Both last shipped on October 24, 2026.

Scorecard2 real differences · 8 level
SEM versus Dead Man Switch: the parameters behind the verdict, then further details
ParameterSEMDead Man Switch
PriceFreeFree
Rating3.4 (11 ratings) — better—
Positive reviews37.5% of reviews—
Number of ratings11 — better—
Update frequencyEvery 2 weeksEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.615.0 — better
Further details — not scored
Size31 MB44 MB
Age rating4+4+
DeveloperHangzhou Dashi Wisdom Technology Co., Ltd.Nam Nguyen

In-app purchases

None

SEM

No in-app purchases

1 purchases

Dead Man Switch

Subscriptions1
  • Pro Annual Access$4.991 Year

Questions

Is SEM free?
SEM is free to download, with no in-app purchases.
Is Dead Man Switch free?
Dead Man Switch is free to download, with in-app purchases available.
Do SEM or Dead Man Switch have ads?
Neither SEM nor Dead Man Switch shows ads.
Which is updated more often, SEM or Dead Man Switch?
SEM ships an update every 2 weeks, and Dead Man Switch every 4 days. Most recently, SEM was updated on October 24, 2026 and Dead Man Switch on October 24, 2026.

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