# D2B vs Caliper&Ruler

The clearest difference is in-app purchases: D2B at none against Caliper&Ruler's 1. D2B also leads on iOS requirement (15.0 vs 18.4). Caliper&Ruler's advantage is update cadence (every 6 weeks vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. Caliper&Ruler sells 1 one-off in-app purchase. D2B asks for nothing beyond the download.

D2B ships an update every 4 months, Caliper&Ruler every 6 weeks. The most recent releases landed on October 11, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | D2B | Caliper&Ruler |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/caliper-and-ruler/id6749051381/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 6 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 41 MB | 5 MB |
| Requires iOS | **15.0** | 18.4 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [SEER DIGITAL](https://appshunter.io/developer/1083923341) | [Jun Yamabe](https://appshunter.io/developer/1732682049) |

## What reviewers say

### D2B

[App page](https://appshunter.io/ios/app/d2b/id6747258840)

**Features:** macOS Compatibility

**In-app purchases:** none


### Caliper&Ruler

[App page](https://appshunter.io/ios/app/caliper-and-ruler/id6749051381)

Transform your device into a precise digital caliper for measuring objects in inches and millimeters. Features intuitive drag-and-measure functionality and accurate screen calibration using common items.

**Highlights:** Dual measurement units (inches/millimeters), Intuitive drag-and-measure interface, Accurate screen calibration, Custom calibration options, Universal device compatibility

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is D2B free?

D2B is free to download, with no in-app purchases.

### Is Caliper&Ruler free?

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

### Do D2B or Caliper&Ruler have ads?

Neither D2B nor Caliper&Ruler shows ads.

### Which is updated more often, D2B or Caliper&Ruler?

D2B ships an update every 4 months, and Caliper&Ruler every 6 weeks. Most recently, D2B was updated on October 11, 2026 and Caliper&Ruler on October 12, 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.*