# Prime Press E vs Caliper

The clearest difference is in-app purchases: Prime Press E at none against Caliper's 1. Prime Press E also leads on device support (3 vs 1) and iOS requirement (13.0 vs 16.4). Caliper's advantage is update cadence (every 2 days vs every 2 months). On price and ads there is nothing between them.

Both are free to download. Caliper sells 1 one-off in-app purchase. Prime Press E asks for nothing beyond the download.

Prime Press E ships an update every 2 months, Caliper every 2 days. The most recent releases landed on October 25, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Prime Press E | Caliper |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Size | 126 MB | 37 MB |
| Requires iOS | **13.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [PRIME PRESS LTD GREEK BRANCH](https://appshunter.io/developer/1618196916) | [Concept of Proof B.V.](https://appshunter.io/developer/1818652911) |

## What reviewers say

### Prime Press E

[App page](https://appshunter.io/ios/app/prime-press-e-kit/id6743487373)

**Features:** macOS Compatibility

**In-app purchases:** none


### Caliper

[App page](https://appshunter.io/ios/app/caliper-vernier-trainer/id6816234993)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caliper Full Access | $2.99 | one-time |


## Frequently asked questions

### Is Prime Press E free?

Prime Press E is free to download, with no in-app purchases.

### Is Caliper free?

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

### Do Prime Press E or Caliper have ads?

Neither Prime Press E nor Caliper shows ads.

### Which is updated more often, Prime Press E or Caliper?

Prime Press E ships an update every 2 months, and Caliper every 2 days. Most recently, Prime Press E was updated on October 25, 2026 and Caliper on October 26, 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.*