# Slope Calc vs Heller's Gas

The clearest difference is price: Heller's Gas at Free against Slope Calc's $0.99. Slope Calc's advantage is iOS requirement (7.0 vs 12.2). On update cadence, ads, in-app purchases and device support there is nothing between them.

Heller's Gas is free to download; Slope Calc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Slope Calc ships an update every 21 months, Heller's Gas every 14 months. The most recent releases landed on November 10, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Slope Calc | Heller's Gas |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.2 (17 ratings)](https://appshunter.io/ios/app/hellers-gas/id1451310589/reviews)** |
| Number of ratings | — | **17** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 14 months** |
| Monetization | — | Free |
| Size | 1 MB | 46 MB |
| Requires iOS | **7.0** | 12.2 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yosuke Kurashima](https://appshunter.io/developer/806702002) | [Heller's Gas](https://appshunter.io/developer/1451310588) |

## What reviewers say

### Slope Calc

[App page](https://appshunter.io/ios/app/slope-calc/id806701999)

**Features:** macOS Compatibility

**In-app purchases:** none


### Heller's Gas

[App page](https://appshunter.io/ios/app/hellers-gas/id1451310589)

Manage your Heller's Gas account on the go. View your balance, invoices, and payment history. Request deliveries and service, and make payments directly from your mobile device.

**Highlights:** View current balance, Access open invoices, Track pending payments, Request deliveries, Request service, View account history

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Slope Calc free?

Slope Calc costs $0.99, with no in-app purchases.

### Is Heller's Gas free?

Heller's Gas is free to download, with no in-app purchases.

### Do Slope Calc or Heller's Gas have ads?

Neither Slope Calc nor Heller's Gas shows ads.

### Which is updated more often, Slope Calc or Heller's Gas?

Slope Calc ships an update every 21 months, and Heller's Gas every 14 months. Most recently, Slope Calc was updated on November 10, 2026 and Heller's Gas on November 2, 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.*