# CALIPER App vs SPIRO

The clearest difference is review sentiment: CALIPER App at 100% against SPIRO's 0%. CALIPER App also leads on price (Free vs $3.99). SPIRO's advantage is update cadence (every 7 months vs every 16 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

CALIPER App is free to download; SPIRO costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

CALIPER App ships an update every 16 months, SPIRO every 7 months. The most recent releases landed on September 10, 2026 and July 9, 2026 respectively.

## The numbers

| Metric | CALIPER App | SPIRO |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/caliper-app/id849920476/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 7 months** |
| Monetization | **Free** | Paid |
| Size | 26 MB | 125 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [The Hospital for Sick Children](https://appshunter.io/developer/444728983) | [Universite Laval](https://appshunter.io/developer/386592978) |

## What reviewers say

### CALIPER App

[App page](https://appshunter.io/ios/app/caliper-app/id849920476)

This app helps healthcare professionals and parents compare a child's lab test results against a comprehensive, up-to-date database of normal values. It simplifies the assessment of pediatric laboratory data, aiding in the identification of potential health concerns and treatment adjustments.

**Highlights:** Pediatric lab test comparison, Up-to-date reference value database, Supports over 100 routine tests, User-friendly interface, Portable on-the-go tool, Validated and published data

**In-app purchases:** none


### SPIRO

[App page](https://appshunter.io/ios/app/spiro/id1135982423)

This medical app assists healthcare professionals and students in interpreting spirometry tests. It provides diagnostic and treatment suggestions based on entered data and offers access to educational materials and respiratory health guidelines.

**Highlights:** Interpret spirometry tests, Diagnostic suggestions, Treatment suggestions, Access respiratory guidelines, Educational material, Patient follow-up tool

**In-app purchases:** none


## Frequently asked questions

### Is CALIPER App free?

CALIPER App is free to download, with no in-app purchases.

### Is SPIRO free?

SPIRO costs $3.99, with no in-app purchases.

### Do CALIPER App or SPIRO have ads?

Neither CALIPER App nor SPIRO shows ads.

### Which is updated more often, CALIPER App or SPIRO?

CALIPER App ships an update every 16 months, and SPIRO every 7 months. Most recently, CALIPER App was updated on September 10, 2026 and SPIRO on July 9, 2026.

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