# Back vs Kaliper

The clearest difference is review sentiment: Back at 100% against Kaliper's 50%. Back also leads on in-app purchases (none vs 1) and ads (none vs shown). Kaliper's advantage is price (Free vs $0.99) and ratings volume (8 vs 2). On update cadence, device support and iOS requirement there is nothing between them.

Kaliper is free to download; Back costs $0.99 up front. Kaliper sells 1 one-off in-app purchase. Back asks for nothing beyond the download.

Back holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 2 and 8 respectively. Written reviews point the same way: 100% of Back's written reviews are positive against 50% of Kaliper's.

Back ships an update every 7 months, Kaliper every 8 months. The most recent releases landed on October 23, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Back | Kaliper |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/back-time-calculator/id429892615/reviews)** | [4.6 (8 ratings)](https://appshunter.io/ios/app/kaliper/id1469528726/reviews) |
| Number of ratings | 2 | **8** |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 7 months** | Every 8 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 4 MB | 4 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Goodman Productions](https://appshunter.io/developer/415454974) | [Farren Domenici](https://appshunter.io/developer/583666476) |

## What reviewers say

### Back

[App page](https://appshunter.io/ios/app/back-time-calculator/id429892615)

This utility app subtracts entered time values from a starting point of 60:00. It allows for easy deletion of individual entries or clearing all values to start fresh. Ideal for quick time calculations.

**Highlights:** Subtracts entered time values, Starts at 60:00, AC button to clear all, Swipe to delete individual entries, Simple user interface

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Kaliper

[App page](https://appshunter.io/ios/app/kaliper/id1469528726)

Measure key cuts accurately using your device's camera. This utility helps decode keys when a physical caliper is unavailable or difficult to read. Offers predefined systems and custom measurement options for various lock types.

**Highlights:** Measure key cuts with device camera, Predefined lock systems, Custom key measurement input, Ad-free upgrade option, Supports various lock brands

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kaliper Full Version | $1.99 | one-time |


## Frequently asked questions

### Is Back free?

Back costs $0.99, with no in-app purchases.

### Is Kaliper free?

Kaliper is free to download, with in-app purchases available.

### Which has better reviews, Back or Kaliper?

Back is rated higher. Back averages 5.0 out of 5 from 2 ratings, while Kaliper averages 4.6 from 8 ratings.

### Do Back or Kaliper have ads?

Kaliper shows ads; Back does not.

### Which is updated more often, Back or Kaliper?

Back ships an update every 7 months, and Kaliper every 8 months. Most recently, Back was updated on October 23, 2026 and Kaliper on October 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*