Delta Calc vs iAliveWell
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Delta Calc
Quickly calculate percent changes, discounts, and financial gains without complex math. Solve for any of the three values in the percent change formula with an intuitive interface and fun animations.
- Calculate percent changes
- Solve for any variable in the formula
- Customizable decimal places
- Haptic feedback
- Fun animations
- Adjustable keyboard buttons
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A fast, easy, and fun-to-use percent change calculator. Now you can quickly calculate discounts, financial gains, and percent changes without having to use Excel, Google, or do the long math. Delta Calc can solve for any of the three values within the percent change formula. It solves for the a, b, or c value in the percent change formula ((b - a) / a) * 100 = c. Other features include: - Haptic feedback (can be disabled if desired) - Change the number of decimal places displayed in the result (from 0 to 10) - Fun animation when tapping the swap button (warning: could become addictive) - Delightful to tap number pad buttons - Enable and disable keyboard buttons Terms: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://deltacalc.app/privacy Support: https://deltacalc.app/support
iAliveWell
This app provides a safety net for individuals living alone, the elderly, and outdoor enthusiasts. It automatically checks in on users by monitoring activity metrics and alerts designated contacts if inactivity is detected. It offers peace of mind through a minimalist, privacy-first design.
- Smart Auto Check-in with HealthKit
- Inactivity Alerts
- Emergency Notifications to Contacts
- Minimalist Background Operation
- Privacy-First Data Handling
- Remote Guardian System with Share Code
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iAliveWell is an intelligent safety companion designed for individuals living alone, elderly care, and outdoor enthusiasts. We provide an invisible safety net to ensure that you are always connected and protected when it matters most. [Core Features] Smart Auto Check-in: iAlive integrates seamlessly with HealthKit. By monitoring activity metrics like steps and heart rate, the app identifies your safety status and completes "Daily Check-ins" automatically while you are active. Inactivity Alerts: If no activity is detected within your predefined window (e.g., no step count updates or app usage), iAlive triggers a safety alert to check on you. Emergency Notifications: In the event of a missed check-in and subsequent non-response, iAlive will notify your designated emergency contacts, ensuring help is called when needed. Minimalist Experience: Designed for simplicity. Once configured, the app runs quietly in the background, providing peace of mind without constant manual input. Privacy First: Your health data stays on your device and within your personal iCloud. We do not track your specific location or upload sensitive health details. We only send out alerts when a safety risk is detected. Feature Highlight: Remote Guardian Zero-Effort Linking: Powered by Apple's CloudKit. No account creation required—just use a simple 6-digit share code. Real-time Sync: Get instant push notifications whenever your loved ones check in. Safety Alerts: Guardians receive automatic warnings if a user misses their check-in for several consecutive days. Privacy First: Works even with different Apple IDs. Data is securely handled by Apple's infrastructure with end-to-end privacy. Added CloudKit Remote Guardian system. Added Guardian Management tab and share code system. Optimized check-in flow with automatic cloud sync. [Who is it for?] Living Alone: Provides peace of mind for you and your family. Outdoor Adventures: An extra layer of safety for hiking and solo trips. Elderly Support: A gentle way to monitor the well-being of loved ones without intrusive calls. iAliveWell: Guardian for every heartbeat. Apple Official User Documentation (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: iAliveWell at Free against Delta Calc's $0.99. On ads, in-app purchases, 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
iAliveWell is free to download; Delta Calc costs $0.99 up front. Delta Calc sells 1 one-off in-app purchase and iAliveWell sells 2 in-app purchases, starting at $0.99 per year. Whichever you choose, the download price is not the number that matters.
| Parameter | Delta Calc | iAliveWell |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | — |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 days | — |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.6 — better | 18.0 |
| Further details — not scored | ||
| Size | 2 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Stephen Coffey | Naihe Hu |
Customer experience
Delta Calc
iAliveWell
In-app purchases
Delta Calc
- Delta Calc Lifetime$9.99
iAliveWell
- Yearly Pro$0.991 Year
- LifeTime Pro$2.99








