# LuldCalc — Limit Up Limit Down Calculator

> Stock market price band calculator for traders and exchange operators. (iPhone/iPad app by Michael Yam.)

- Source: https://appshunter.io/ios/app/luldcalc/id1451896941 (this page in markdown: same URL + `.md`)
- Developer: [Michael Yam](https://appshunter.io/developer/1451896940)
- Category: Finance, Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 15.0 · 0 MB
- Languages: English
- Released: 2019-04-23
- Data updated: 2026-07-07
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/luldcalc/id1451896941/reviews.md

## What is LuldCalc?

In an effort to calm volatile markets, the stock exchanges implemented Limit Up Limit Down (LULD), a mechanism to prevent stocks from trading above or below calculated price boundaries, also known as price bands.

LuldCalc is a calculator for traders and stock exchange operators, and is handy for identifying these bands.  It has buttons for tier 1 and tier 2 stocks, and calculates double-wide bands for market open and market close.  It's a basic calculator too.

So put away your business calculator and memory functions.  Set aside that pencil and paper. Don't bother loading a spreadsheet to calculate a stock's price bands. Use LuldCalc.

## Key features

- Limit Up Limit Down (LULD) calculation
- Tier 1 and Tier 2 stock support
- Double-wide band calculation
- Market open and close band calculation
- Basic calculator functionality


## Frequently asked questions about LuldCalc

### What is LuldCalc used for?

LuldCalc is used to calculate Limit Up Limit Down (LULD) price bands for stocks, which are implemented to stabilize volatile markets. It assists traders and stock exchange operators in identifying these price boundaries.

### Does LuldCalc support different stock tiers?

Yes, LuldCalc has dedicated buttons for calculating price bands for both Tier 1 and Tier 2 stocks.

### Can LuldCalc calculate bands for market open and close?

Yes, LuldCalc can calculate double-wide bands specifically for market open and market close times.

### Is LuldCalc only a specialized calculator?

No, in addition to its specialized stock market functions, LuldCalc also includes basic calculator functionality.

### What devices is LuldCalc available on?

LuldCalc is available on iPhone and iPod devices.

### How often is LuldCalc updated?

The latest version of LuldCalc is 1.2, and it was last updated on December 9, 2022.

### What is the age rating for LuldCalc?

LuldCalc has an age rating of 4+, making it suitable for a wide range of users.

### Does LuldCalc have ads?

No, LuldCalc does not contain advertisements.

## Version history (last 3 releases)

### 1.2 — 2022-12-09

This update improves readability and contrast. LuldCalc has also been rebuilt to meet iOS 15 standards.

### 1.1 — 2019-07-29

Changes are cosmetic: improved screen readability and contrast, and enhanced icons.

### 1.0 — 2019-04-23

No release notes.

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## More apps by Michael Yam

- [MR2-Check](https://appshunter.io/ios/app/mr2-check/id6748548711)

All apps by Michael Yam: https://appshunter.io/developer/1451896940

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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 2026-07-07.*