# Jublag vs iImprov

The clearest difference is iOS requirement: iImprov at 15.6 against Jublag's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Jublag costs $3.99 and iImprov $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Jublag ships an update every 20 months, iImprov every 28 months. The most recent releases landed on September 16, 2026 and July 22, 2026 respectively.

## The numbers

| Metric | Jublag | iImprov |
| --- | --- | --- |
| Price | $3.99 | $3.99 |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/iimprov-modal/id434112459/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 68.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 20 months** | Every 28 months |
| Monetization | — | Paid |
| Size | 30 MB | 8 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [emacsian Company Limited](https://appshunter.io/developer/388819355) | [Jazz Apps Mobile LLC](https://appshunter.io/developer/421582808) |

## What reviewers say

### Jublag

[App page](https://appshunter.io/ios/app/jublag/id388826323)

**Features:** Vision Pro support

**In-app purchases:** none


### iImprov

[App page](https://appshunter.io/ios/app/iimprov-modal/id434112459)

This app helps jazz musicians of all levels master modal improvisation. It offers detailed explanations of theory, scale relationships, and practical exercises with audio and JAM-A-longs in various keys and styles. Tailored for modal tunes, it covers minor modal, 7 sus 4, and Major 7#4 progressions.

**Highlights:** Modal improvisation theory, Scale and chord relation explanations, Pentatonic scale usage, Audio and visual scale examples, Interactive JAM-A-longs, Adjustable tempo and instrument balance, Transposition selection

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Jublag free?

Jublag costs $3.99, with no in-app purchases.

### Is iImprov free?

iImprov costs $3.99, with no in-app purchases.

### Do Jublag or iImprov have ads?

Neither Jublag nor iImprov shows ads.

### Which is updated more often, Jublag or iImprov?

Jublag ships an update every 20 months, and iImprov every 28 months. Most recently, Jublag was updated on September 16, 2026 and iImprov on July 22, 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.*