# Drill Calc vs cDs Online

The clearest difference is price: cDs Online at Free against Drill Calc's $2.99. cDs Online also leads on update cadence (monthly vs every 18 months) and iOS requirement (9.0 vs 12.0). Drill Calc's advantage is rating (4.1 vs 1.0) and ratings volume (19 vs 4). On ads, in-app purchases and device support there is nothing between them.

cDs Online is free to download; Drill Calc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Drill Calc holds the better App Store score, 4.1 against 1.0. Both are backed by a comparable volume of ratings — 19 and 4 respectively.

Drill Calc ships an update every 18 months, cDs Online monthly. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Drill Calc | cDs Online |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.1 (19 ratings)](https://appshunter.io/ios/app/drill-calc/id304434324/reviews)** | [1.0 (4 ratings)](https://appshunter.io/ios/app/cds-online/id1269738238/reviews) |
| Number of ratings | **19** | 4 |
| Positive reviews | 91.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Monthly** |
| Monetization | Paid | **Free** |
| Size | 5 MB | 14 MB |
| Requires iOS | 12.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Black Cat Systems](https://appshunter.io/developer/301047032) | [cDsGlobal](https://appshunter.io/developer/456613165) |

## What reviewers say

### Drill Calc

[App page](https://appshunter.io/ios/app/drill-calc/id304434324)

This utility app helps you determine the correct drill bit size for threaded holes. It supports both inch and metric threads, calculates close and tight fit hole sizes, and provides tables for standard drill bit sizes and pipe information.

**Highlights:** Calculates drill bit size for threaded holes, Supports inch and metric threads, Displays close and tight fit hole sizes, Includes standard inch fractional and numeric drill bit tables, Provides pipe size information, Offers data on common wood screw sizes

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

**In-app purchases:** none


### cDs Online

[App page](https://appshunter.io/ios/app/cds-online/id1269738238)

This app allows agents to sync and showcase client portfolios, videos, and polaroids on iOS devices. Agents can create custom packages with their branding for client reviews, managing talent displays and accessing their client database.

**Highlights:** Offline viewing of imaging packages, Create and sync client packages, Display portfolios, videos, and polaroids, Customizable branding with agency logo, Access client database, Agent-controlled talent display

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Drill Calc free?

Drill Calc costs $2.99, with no in-app purchases.

### Is cDs Online free?

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

### Which has better reviews, Drill Calc or cDs Online?

Drill Calc is rated higher. Drill Calc averages 4.1 out of 5 from 19 ratings, while cDs Online averages 1.0 from 4 ratings.

### Do Drill Calc or cDs Online have ads?

Neither Drill Calc nor cDs Online shows ads.

### Which is updated more often, Drill Calc or cDs Online?

Drill Calc ships an update every 18 months, and cDs Online monthly. Most recently, Drill Calc was updated on October 21, 2026 and cDs Online on October 24, 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.*