Comparison

iSafeCharge+ vs Houstudia Calculator

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

Head to head
About

iSafeCharge+

Transform your device into a robust anti-theft alarm. It alerts you if your phone is moved or unplugged while charging. Features include intruder photos and adjustable sensitivity for maximum security.

Highlights
  • Motion detection alarm
  • Charger unplug alert
  • Intruder photo capture
  • Adjustable sensitivity
  • Force max volume siren
  • Background protection
Features
Read full description

**iSafeCharge - Phone Security Alarm** • Turn your iPhone into a powerful anti-theft alarm. Whether you're charging at a café, studying at the library, or just keeping your phone safe at home – iSafeCharge has you covered. ** Three Protection Modes:** • Motion Detection – Alerts you when someone picks up or moves your phone • Cable Detection – Triggers if someone unplugs your charger (also detects power outages!) • Both – Maximum protection with motion AND cable monitoring **Smart Features:** • Intruder Photos – Automatically captures photos when someone unlocks your phone to stop the alarm • Adjustable Sensitivity – Fine-tune motion detection to prevent false alarms • Force Max Volume – Siren plays at full volume even if your phone is muted • Works in Background – Protection continues even when screen is locked • Battery Indicator – See your charge level at a glance **Perfect For:** • Charging in public places • Protecting your phone on your desk • Monitoring power outages overnight • Catching nosy friends or family! * Simple to use: just tap ARM and walk away. Only you can stop it by unlocking your phone.

About

Houstudia Calculator

Features
Read full description

Experience calculating reimagined! Houstudia Calculator solves expressions in real-time as you type, with an intuitive memory system that makes complex calculations effortless. Key Features: Live Results - Watch your calculations solve instantly as you type Smart Memory - Tap any answer to store it, then tap again to reuse it in new expressions Multi-Calculator Tabs - Switch between four color-coded calculators to work on different problems simultaneously without losing your work No More Clearing - Calculate tips, multiply numbers, and find square roots all while keeping your previous results visible Perfect for students, engineers, and anyone who needs a calculator that works as fast as they think!

Screenshots

iSafeCharge+4 screens
Houstudia Calculator4 screens

Verdict

The call

The clearest difference is in-app purchases: Houstudia Calculator at none against iSafeCharge+'s 1. Houstudia Calculator also leads on iOS requirement (15.1 vs 17.6). iSafeCharge+'s advantage is update cadence (monthly vs every 2 months). On price, ads 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. iSafeCharge+ sells 1 one-off in-app purchase. Houstudia Calculator asks for nothing beyond the download.

UpkeepUpdate frequency

iSafeCharge+ ships an update monthly, Houstudia Calculator every 2 months. The most recent releases landed on October 14, 2026 and October 17, 2026 respectively.

Scorecard3 real differences · 7 level
iSafeCharge+ versus Houstudia Calculator: the parameters behind the verdict, then further details
ParameteriSafeCharge+Houstudia Calculator
PriceFreeFree
Rating4.3 (77 ratings) — better—
Positive reviews53.4% of reviews—
Number of ratings77 — better—
Update frequencyMonthly — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.615.1 — better
Further details — not scored
Size17 MB20 MB
Age rating4+12+
DeveloperApp4Life Sweden ABHoustudia

Bugs and requests

iSafeCharge+

Reported bugs

14 issues
  • Motion sensor not working when phone is locked
  • Alarm continues to ring even after closing the app
  • Alarm cannot be turned off without shutting down the phone
  • Motion sensor does not trigger alarm when phone is locked
  • Alarm does not stop when cable is re-plugged
Show 9 more
  • Alarm can be muted by pressing volume buttons
  • App does not work with Apple battery cases
  • Alarm can be bypassed by opening the camera and recording a video
  • Alarm can be turned off by lowering the volume
  • Motion sensor function is unresponsive
  • Alarm continues to sound after unplugging the cable
  • Alarm cannot be stopped by swiping
  • App makes fraudulent charges without consent
  • App collects user data (www google com, app-measurement, googleads doubleclick)

Requested features

14 requests
  • Allow changing alarm volume
  • Add sound for full charge
  • Add voice control for alarm
  • Add option for calmer alarm sounds
  • Add a passcode or other method to turn off alarm
Show 9 more
  • Add timer until fully charged
  • Add light and dark mode
  • Add different alarm settings
  • Add manual safe charge setting
  • Add option to start app automatically when charger is connected
  • Display battery percentage
  • Upgrade logo
  • Add instruction manual
  • Disable volume controls when phone is locked

Houstudia Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

iSafeCharge+

One-time1
  • Remove ads$0.99
None

Houstudia Calculator

No in-app purchases

Questions

Is iSafeCharge+ free?
iSafeCharge+ is free to download, with in-app purchases available.
Is Houstudia Calculator free?
Houstudia Calculator is free to download, with no in-app purchases.
Do iSafeCharge+ or Houstudia Calculator have ads?
Neither iSafeCharge+ nor Houstudia Calculator shows ads.
Which is updated more often, iSafeCharge+ or Houstudia Calculator?
iSafeCharge+ ships an update monthly, and Houstudia Calculator every 2 months. Most recently, iSafeCharge+ was updated on October 14, 2026 and Houstudia Calculator on October 17, 2026.

Other comparisons