Calibrator Pro vs Interval Voice Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calibrator Pro
This utility app allows trained users to calibrate the intrinsic parameters of their Structure Sensor accessory. It requires a specific calibration target and is designed for advanced users to optimize sensor performance. Calibration is quick, taking only a few minutes once trained.
- Calibrate Structure Sensor intrinsic parameters
- Requires specific calibration target
- Designed for trained users
- Quick calibration process (3-5 minutes)
- In-app payment for calibrations
- Bulk purchase discounts available
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NOTE: This application is designed for the Structure Sensor accessory. Learn more at http://structure.io Refine your Structure Sensor's full potential with Calibrator Pro! This is a paid app that enables trained users to calibrate the intrinsic parameters of their Structure Sensor. Users need to contact Structure (XRPro LLC) to obtain a calibration target. The target includes a QR code that informs the app about specific characteristics of each board. As such, users should never use copies of existing boards. The app requires training and, if misused, could result in the deterioration of the calibration of a sensor. Once trained, operators are expected to be able to complete a sensor calibration in 3-5 minutes. This app does not replace the standard Calibrator app (Used to calibrate the extrinsic parameters between a Structure Sensor and the main camera of the iOS device.) This app uses in-app payment. Users have the option to pay to calibrate a single sensor, or you can receive a discount when buying multiple calibrations in bulk. Once a sensor is calibrated, it can be re-calibrated multiple times the same day, free of charge. Device Compatibility: ========== Structure Sensor (Mark II) Structure Sensor Pro [Not compatible with original Structure Sensor (ST01)]
Interval Voice Clock
This app announces the current time at customizable intervals, allowing for hands-free time checks. It offers adjustable volume, voice options, and background playback, functioning entirely offline.
- Customizable announcement intervals
- Adjustable announcement volume
- Choice of male or female voice
- Background playback support
- Offline functionality
- Multiple announcement types
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Signal Time is a simple and easy-to-read app that announces the time at regular intervals. By default, it announces the time every 10 seconds (customizable). Use it in various situations—have it read the time aloud while you're busy getting ready in the morning, or check the time hands-free in the kitchen while waiting for your favorite show to start. No internet connection is required; the app works entirely offline. * Adjust the volume of both the second-hand sound and voice announcements (can be muted) * Set the announcement interval (from every 10 seconds to every hour) * Choose the type of voice used for announcements (female or male) * Supports background playback * Choose the type of announcements (Standard, Simple and Minimal)
Screenshots
Verdict
The clearest difference is price: Calibrator Pro at Free against Interval Voice Clock's $1.99. Calibrator Pro also leads on iOS requirement (13.0 vs 15.0). Interval Voice Clock's advantage is in-app purchases (none vs 2) and update cadence (every 2 weeks vs every 2 months). On rating, ratings volume and ads 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
Calibrator Pro is free to download; Interval Voice Clock costs $1.99 up front. Calibrator Pro sells 2 one-off in-app purchases. Interval Voice Clock asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Calibrator Pro against 5.0 for Interval Voice Clock. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
Calibrator Pro ships an update every 2 months, Interval Voice Clock every 2 weeks. The most recent releases landed on June 11, 2026 and September 22, 2026 respectively.
| Parameter | Calibrator Pro | Interval Voice Clock |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | — | 66.7% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Every 2 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 18 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | XRPro, LLC | Ryo Okamoto |
Customer experience
Calibrator Pro
Interval Voice Clock
In-app purchases
Calibrator Pro
- One sensor calibration$49.99
- Two hundred calibrations$999.99
Interval Voice Clock
No in-app purchases
Questions
Is Calibrator Pro free?
Is Interval Voice Clock free?
Which has better reviews, Calibrator Pro or Interval Voice Clock?
Do Calibrator Pro or Interval Voice Clock have ads?
Which is updated more often, Calibrator Pro or Interval Voice Clock?
Other comparisons
