# BuildDeck vs DB RelationalAlgebra

The clearest difference is iOS requirement: BuildDeck at 15.0 against DB RelationalAlgebra's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

BuildDeck ships an update every 2 weeks, DB RelationalAlgebra every 3 weeks. The most recent releases landed on November 12, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | BuildDeck | DB RelationalAlgebra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/db-relationalalgebra/id6792125742/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 weeks |
| Monetization | — | Free |
| Size | 17 MB | 2 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yuto Tosa](https://appshunter.io/developer/6779092871) | [Artur Borycki](https://appshunter.io/developer/6792125744) |

## What reviewers say

### BuildDeck

[App page](https://appshunter.io/ios/app/builddeck/id6780652258)

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

**In-app purchases:** none


### DB RelationalAlgebra

[App page](https://appshunter.io/ios/app/db-relationalalgebra/id6792125742)

This app translates SQL queries into relational algebra, tuple relational calculus, and domain relational calculus. It provides step-by-step derivations, final formulas, and interactive diagrams for each notation. It accurately reports when SQL cannot be expressed exactly by a notation.

**Highlights:** SQL to relational algebra conversion, SQL to tuple relational calculus conversion, SQL to domain relational calculus conversion, Step-by-step derivations, Interactive operator and quantifier scope trees, Comparison view of all notations

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

**In-app purchases:** none


## Frequently asked questions

### Is BuildDeck free?

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

### Is DB RelationalAlgebra free?

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

### Do BuildDeck or DB RelationalAlgebra have ads?

Neither BuildDeck nor DB RelationalAlgebra shows ads.

### Which is updated more often, BuildDeck or DB RelationalAlgebra?

BuildDeck ships an update every 2 weeks, and DB RelationalAlgebra every 3 weeks. Most recently, BuildDeck was updated on November 12, 2026 and DB RelationalAlgebra on November 5, 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.*