Slope Calc vs Heller's Gas
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Slope Calc
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“Why is the size of Calculator each buttons same? “ “How order is the priority of Calculator button? “ “What type Calculator is designed ,According to this priority? “ From those point,I redesign Calculator. Calculator is for Calculation.Not for inputting number. Consequently, the most important button is NOT number buttons. The most important button is 4 arithmetical operation buttons. I design those 4 arithmetical operation button is bigger than 10 number buttons. I put those 4 buttons around number buttons(relative position). And if you incline your iPhone to the direction of top and bottom right and left , you can input 4 arithmetical operation. ・Future function additional plan Equal sign input by the gesture
Heller's Gas
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.
- View current balance
- Access open invoices
- Track pending payments
- Request deliveries
- Request service
- View account history
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Mobile account management for Heller's Gas Customers is here! View current balance, open invoices, pending payments, and deliveries. Make payments, request deliveries, request service, view account history and more!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Slope Calc | Heller's Gas |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | — | 4.2 (17 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 17 — better |
| Update frequency | Every 21 months | Every 14 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 7.0 — better | 12.2 |
| Further details — not scored | ||
| Size | 1 MB | 46 MB |
| Age rating | 4+ | 4+ |
| Developer | Yosuke Kurashima | Heller's Gas |
In-app purchases
Slope Calc
No in-app purchases
Heller's Gas
No in-app purchases
