# constant. vs Deckbase

The clearest difference is in-app purchases: constant. at none against Deckbase's 4. constant. also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Deckbase sells 4 in-app purchases, starting at $5.99 per month. constant. asks for nothing beyond the download.

constant. ships an update every 3 days, Deckbase every 4 days. The most recent releases landed on October 6, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | constant. | Deckbase |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (3 ratings)](https://appshunter.io/ios/app/deckbase-ai-flashcard-maker/id6760248255/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 4 days |
| Monetization | — | Free with in-app purchases |
| Size | 28 MB | 106 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Chun-Huei Liu](https://appshunter.io/developer/1657411874) | [Yosuke Sakurai](https://appshunter.io/developer/1706591331) |

## What reviewers say

### constant.

[App page](https://appshunter.io/ios/app/constant/id6748115880)

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

**In-app purchases:** none


### Deckbase

[App page](https://appshunter.io/ios/app/deckbase-ai-flashcard-maker/id6760248255)

This AI-powered study assistant generates flashcards from various file types and chat inputs. It utilizes spaced repetition for effective long-term memory retention and offers AI-generated images and audio for enhanced learning.

**Highlights:** AI chat assistant for instant flashcard generation, AI image and audio generation for mnemonic aids, Bulk flashcard creation from documents and files, OCR for generating cards from photos and scans, Spaced repetition for memory retention, Clean and focused study interface

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Month | $5.99 | per month |
| Pro Month | $11.99 | per month |
| Basic Year | $59.00 | per year |
| Pro Year | $119.00 | per year |


## Frequently asked questions

### Is constant. free?

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

### Is Deckbase free?

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

### Do constant. or Deckbase have ads?

Deckbase shows ads; constant. does not.

### Which is updated more often, constant. or Deckbase?

constant. ships an update every 3 days, and Deckbase every 4 days. Most recently, constant. was updated on October 6, 2026 and Deckbase on October 11, 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.*