# Ref Tools vs Optsy Mobile

The clearest difference is rating: Ref Tools at 3.9 against Optsy Mobile's 3.0. Ref Tools also leads on review sentiment (58% vs 20%) and update cadence (monthly vs every 3 months). Optsy Mobile's advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Ref Tools holds the better App Store score, 3.9 against 3.0. That said, the two scores are not equally well evidenced: Ref Tools has 52 ratings behind it against 9, so its average is the more settled of the two. Written reviews point the same way: 58% of Ref Tools's written reviews are positive against 20% of Optsy Mobile's.

Ref Tools ships an update monthly, Optsy Mobile every 3 months. The most recent releases landed on November 10, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Ref Tools | Optsy Mobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (52 ratings)](https://appshunter.io/ios/app/ref-tools/id472312541/reviews)** | [3.0 (9 ratings)](https://appshunter.io/ios/app/optsy-mobile/id477793283/reviews) |
| Number of ratings | **52** | 9 |
| Positive reviews | **57.6% of reviews** | 20.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 3 months |
| Monetization | Free | Free |
| Size | 98 MB | 27 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Danfoss A/S](https://appshunter.io/developer/423984644) | [Optsy LLC](https://appshunter.io/developer/1067335399) |

## What reviewers say

### Ref Tools

[App page](https://appshunter.io/ios/app/ref-tools/id472312541)

This app provides HVACR technicians with essential digital tools for on-the-job support. It includes features for refrigerant calculations, troubleshooting, product information, spare parts, and optimizing system performance. Listen to industry podcasts for educational entertainment.

**Highlights:** Refrigerant pressure/temperature calculations, Solenoid valve coil testing, Refrigeration system troubleshooting guide, Product data finder, Spare parts ordering, Low-GWP refrigerant comparison, TXV superheat optimization, Industry podcasts

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

**In-app purchases:** none

**What reviewers like**

- 👍 Useful tool for HVAC/R techs
- 👍 Great idea for an app
- 👍 Best refrigeration and hvac app
- 👍 Useful App for HVACR
- 👍 Brilliant app

**What reviewers complain about**

- 🐛 Crashes instantly on launch
- 🐛 App won’t open on iPhone
- 🐛 Flashes up and disappears
- 🐛 Cannot open app
- 🐛 Immediately shuts off

**Reported bugs**

- CRASHED instantly on Mac Mini M4
- App won’t open on iPhone
- App flashes up and disappears
- Cannot open app
- Immediately shuts off since recent release

**Requested features**

- More residential AC information
- Troubleshooter for Residential & Commercial
- Add SP22 refrigerant
- Add R-11 refrigerant
- Add R-123 range down to 40 degrees


### Optsy Mobile

[App page](https://appshunter.io/ios/app/optsy-mobile/id477793283)

This field service management app helps technicians in the field efficiently manage their schedules, work orders, and customer interactions. It allows for real-time updates, offline functionality, and direct communication with customers and contacts.

**Highlights:** View and update schedules, Record work order status changes, Track time-in/time-out, Update labor and invoice details, Record materials used and add attachments, Capture customer signatures, Offline functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is Ref Tools free?

Ref Tools is free to download, with no in-app purchases.

### Is Optsy Mobile free?

Optsy Mobile is free to download, with no in-app purchases.

### Which has better reviews, Ref Tools or Optsy Mobile?

Ref Tools is rated higher. Ref Tools averages 3.9 out of 5 from 52 ratings, while Optsy Mobile averages 3.0 from 9 ratings.

### Do Ref Tools or Optsy Mobile have ads?

Neither Ref Tools nor Optsy Mobile shows ads.

### Which is updated more often, Ref Tools or Optsy Mobile?

Ref Tools ships an update monthly, and Optsy Mobile every 3 months. Most recently, Ref Tools was updated on November 10, 2026 and Optsy Mobile on November 1, 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.*