# HelvetiKit — All-in-one developer tool

> On-device developer toolbox for QR codes, color, JSON, JWT, text, UUID, hash, encoding, timestamps, and regex. (iPhone/iPad app by 阳 张.)

- Source: https://appshunter.io/ios/app/helvetikit/id6752776197 (this page in markdown: same URL + `.md`)
- Developer: [阳 张](https://appshunter.io/developer/1832378186)
- Category: Utilities, Developer Tools
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 18.5 · 3 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2025-09-22
- Data updated: 2026-08-08
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/helvetikit/id6752776197/reviews.md

## What is HelvetiKit?

HelvetiKit is a clean, fast, on‑device toolbox for everyday development tasks. No web round‑trips, no clutter — just the utilities you reach for all the time, in one place.

What you can do

• QR Tools
  – Generate high‑quality QR codes from any text or URL
  – Scan with the camera or import photos to decode existing codes
  – Save generated QR images to your Photos

• Color
  – Convert between HEX ⇄ RGB ⇄ HSL
  – Pick colors with the system color picker and copy code snippets (SwiftUI/UIColor)

• JSON
  – Pretty‑print, minify, validate
  – Sort keys, handle fragments, and even normalize curly quotes

• JWT Decode
  – Safely decode header/payload (Base64URL)
  – Pretty‑printed JSON when available

• Text Case
  – camelCase, PascalCase, UPPERCASE, lowercase

• UUID
  – Generate v4 UUIDs in bulk

• Hash
  – MD5, SHA‑1/256/512 from any input

• Base64 / URL Encode
  – Encode/Decode with sensible defaults

• Timestamp
  – Convert Unix timestamps ⇄ Date (ms supported)

• Regex
  – Test and replace with instant feedback

Designed for speed and privacy

• On‑device: Your input stays on your device; nothing is uploaded.
• Thoughtful UI: Compact layout, keyboard‑friendly editing, copy helpers.
• iPhone + iPad: Landscape support and adaptive layouts.
• Localization: English and Simplified Chinese.

Go Pro (optional)

Unlock unlimited runs when you need heavy use. HelvetiKit remains fully usable for quick tasks in the free tier.

We’re actively improving HelvetiKit — if there’s a converter or utility you’d love to see, let us know!

## Key features

- QR code generation and scanning
- Color format conversion (HEX, RGB, HSL)
- JSON pretty-printing, minifying, and validation
- JWT decoding
- Text case conversion
- UUID generation
- Hashing (MD5, SHA-1/256/512)
- Base64 / URL encoding/decoding
- Timestamp conversion
- Regex testing and replacement

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pro User | $0.99 | one-time |



## Frequently asked questions about HelvetiKit

### What can HelvetiKit do?

HelvetiKit offers a suite of on-device developer utilities. This includes generating and scanning QR codes, converting between color formats like HEX, RGB, and HSL, formatting and validating JSON, decoding JWTs, performing text case conversions, generating UUIDs, hashing inputs, encoding/decoding Base64 and URL strings, converting timestamps, and testing regular expressions.

### Is HelvetiKit free to use?

HelvetiKit is free to download and use for quick tasks. An optional 'Go Pro' upgrade is available to unlock unlimited runs for heavy usage, though the core functionality remains accessible in the free tier.

### Does HelvetiKit have ads?

No, HelvetiKit does not contain advertisements. The app is designed with a clean interface and prioritizes user experience without intrusive ads.

### What devices does HelvetiKit support?

HelvetiKit is available for iPhone and iPad, featuring landscape support and adaptive layouts for a seamless experience across both devices.

### How often is HelvetiKit updated?

The latest version of HelvetiKit is 1.1.3, and it was last updated on April 16, 2026. The developer is actively improving the app and welcomes user suggestions for new features.

### Is my data safe with HelvetiKit?

Yes, HelvetiKit is designed for speed and privacy. All input stays on your device, meaning nothing is uploaded or shared externally, ensuring your data remains secure.

### What languages does HelvetiKit support?

HelvetiKit is currently localized in English and Simplified Chinese, providing accessibility for a wider range of users.

### What is the age rating for HelvetiKit?

HelvetiKit has an age rating of 4+, making it suitable for a broad audience including younger users who may be exploring development concepts.

## Version history (last 5 releases)

### 1.2.0 — 2026-08-01

- bug fixes and improvements

### 1.1.3 — 2026-04-16

- bug fix

### 1.1.2 — 2026-02-28

- bug fix

### 1.1.1 — 2026-01-19

- bug fix

### 1.1.0 — 2026-01-15

- new tools: number, ip, dns, ping, Lorem
- tools can be reordered
- UI enhancements and bug fixes

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## More apps by 阳 张

- [Dreamy Bubble Sweeper](https://appshunter.io/ios/app/dreamy-bubble-sweeper/id6751500146)
- [SimplyRead - EBook Reader](https://appshunter.io/ios/app/simplyread-ebook-reader/id6756316775)
- [AI Joke](https://appshunter.io/ios/app/ai-joke/id6758673277)
- [Body Rhythm](https://appshunter.io/ios/app/body-rhythm/id6760245650)
- [Piano Lab - Your Piano Coach](https://appshunter.io/ios/app/piano-lab-your-piano-coach/id6762797394)

All apps by 阳 张: https://appshunter.io/developer/1832378186

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-08.*