# GEMINI Pump System vs Custom Formulas

The clearest difference is review sentiment: Custom Formulas at 100% against GEMINI Pump System's 50%. Custom Formulas also leads on rating (5.0 vs 2.3) and update cadence (every 5 days vs every 43 months). GEMINI Pump System's advantage is price (Free vs $3.99) and ratings volume (3 vs 1). On ads, in-app purchases and device support there is nothing between them.

GEMINI Pump System is free to download; Custom Formulas costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Custom Formulas holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively. Written reviews point the same way: 50% of GEMINI Pump System's written reviews are positive against 100% of Custom Formulas's.

GEMINI Pump System ships an update every 43 months, Custom Formulas every 5 days. The most recent releases landed on September 19, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | GEMINI Pump System | Custom Formulas |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/gemini-pump-system/id1314043670/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/custom-formulas/id1623368630/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 43 months | **Every 5 days** |
| Monetization | **Free** | Paid |
| Size | 10 MB | 1 MB |
| Requires iOS | **12.4** | 15.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [WAYNE/SCOTT FETZER COMPANY](https://appshunter.io/developer/964180144) | [Anthony Dunk](https://appshunter.io/developer/704471943) |

## What reviewers say

### GEMINI Pump System

[App page](https://appshunter.io/ios/app/gemini-pump-system/id1314043670)

Monitor your sump pump system remotely. Check water levels, battery status, and pump operations. Features Local Link technology for offline connectivity.

**Highlights:** Remote water level check, Battery health monitoring, Pump status updates, Local Link offline connectivity, Wi-Fi restoration notification

**Features:** macOS Compatibility

**In-app purchases:** none


### Custom Formulas

[App page](https://appshunter.io/ios/app/custom-formulas/id1623368630)

This utility app allows users to create and manage complex calculations with multiple inputs and outputs. Formulas can be linked, grouped into categories, and customized for display precision. Share your custom calculations easily via email.

**Highlights:** Multiple input/output formula support, Linked formulas via variable names, Formula categorization, Customizable variable display order, Adjustable output decimal precision, Email formula sharing

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is GEMINI Pump System free?

GEMINI Pump System is free to download, with no in-app purchases.

### Is Custom Formulas free?

Custom Formulas costs $3.99, with no in-app purchases.

### Which has better reviews, GEMINI Pump System or Custom Formulas?

Custom Formulas is rated higher. GEMINI Pump System averages 2.3 out of 5 from 3 ratings, while Custom Formulas averages 5.0 from 1 ratings.

### Do GEMINI Pump System or Custom Formulas have ads?

Neither GEMINI Pump System nor Custom Formulas shows ads.

### Which is updated more often, GEMINI Pump System or Custom Formulas?

GEMINI Pump System ships an update every 43 months, and Custom Formulas every 5 days. Most recently, GEMINI Pump System was updated on September 19, 2026 and Custom Formulas on September 18, 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.*