# Graycode vs Bulbul

The clearest difference is review sentiment: Graycode at 67% against Bulbul's 0%. Graycode also leads on rating (3.0 vs 2.0) and ads (none vs shown). Bulbul's advantage is price (Free vs $2.99) and update cadence (every 2 days vs every 10 months). On ratings volume, in-app purchases and device support there is nothing between them.

Bulbul is free to download; Graycode costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Graycode holds the better App Store score, 3.0 against 2.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 67% of Graycode's written reviews are positive against 0% of Bulbul's.

Graycode ships an update every 10 months, Bulbul every 2 days. The most recent releases landed on October 11, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Graycode | Bulbul |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/graycode/id548428653/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/bulbul-decoy-folder-and-vault/id1532731791/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 2 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 114 MB |
| Requires iOS | **12.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Duo Pisceses, Inc.](https://appshunter.io/developer/850707063) | [heewook shin](https://appshunter.io/developer/1516827497) |

## What reviewers say

### Graycode

[App page](https://appshunter.io/ios/app/graycode/id548428653)

This utility converts numbers between decimal, hexadecimal, binary, and Gray code formats. Changes to one value automatically update the others, making it a convenient tool for engineers. It also features an animated demonstration of the Tower of Hanoi puzzle.

**Highlights:** Decimal, hex, binary, Gray code conversion, Real-time updates, Handy calculator for engineers, Animated Tower of Hanoi solution, Supports iPhone, iPad, iPod

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

**In-app purchases:** none


### Bulbul

[App page](https://appshunter.io/ios/app/bulbul-decoy-folder-and-vault/id1532731791)

Securely store photos and files in separate, password-protected spaces. Each code unlocks a unique vault, preventing a single password from revealing all your data. Features include a file manager, markdown editor, private browser, and camera, with optional Face ID/Touch ID.

**Highlights:** Multiple codes for separate vaults, Integrated file manager, Markdown editor for notes, Private in-app browser, Direct camera saving, Optional Face ID/Touch ID

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Graycode free?

Graycode costs $2.99, with no in-app purchases.

### Is Bulbul free?

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

### Which has better reviews, Graycode or Bulbul?

Graycode is rated higher. Graycode averages 3.0 out of 5 from 2 ratings, while Bulbul averages 2.0 from 1 ratings.

### Do Graycode or Bulbul have ads?

Bulbul shows ads; Graycode does not.

### Which is updated more often, Graycode or Bulbul?

Graycode ships an update every 10 months, and Bulbul every 2 days. Most recently, Graycode was updated on October 11, 2026 and Bulbul on October 29, 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.*