# TNFR vs NSI Pro

The clearest difference is rating: TNFR at 4.4 against NSI Pro's 3.0. TNFR also leads on ratings volume (58 vs 2). NSI Pro's advantage is iOS requirement (11.0 vs 15.6). On price, update cadence, ads and in-app purchases there is nothing between them.

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

TNFR holds the better App Store score, 4.4 against 3.0. That said, the two scores are not equally well evidenced: TNFR has 58 ratings behind it against 2, so its average is the more settled of the two.

TNFR ships an update monthly, NSI Pro every 2 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | TNFR | NSI Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (58 ratings)](https://appshunter.io/ios/app/tnfr/id1257180491/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/nsi-pro/id1479575341/reviews) |
| Number of ratings | **58** | 2 |
| Positive reviews | 90.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 29 MB | 30 MB |
| Requires iOS | 15.6 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The New Flat Rate](https://appshunter.io/developer/1257180280) | [National Comfort Institute, Inc.](https://appshunter.io/developer/1097845247) |

## What reviewers say

### TNFR

[App page](https://appshunter.io/ios/app/tnfr/id1257180491)

This app helps HVAC, Plumbing, and Electrical service providers present five price options for every service call. It streamlines the sales process for technicians by allowing customers to choose their preferred solution, potentially increasing average service call revenue without direct price hikes.

**Highlights:** Offer 5 price options per service call, Interactive diagnostic steps, Summary of findings/project management, Simple invoicing, Customizable price points, Sales reports and analytics

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

**In-app purchases:** none


### NSI Pro

[App page](https://appshunter.io/ios/app/nsi-pro/id1479575341)

This app allows NCI-Certified Contractors to activate and pair with National Safety Instruments' Bluetooth-enabled low-level carbon monoxide monitors. It specifically supports devices like the NSI 6000 for professional use.

**Highlights:** Bluetooth connectivity, Device activation, Monitor pairing, Carbon monoxide monitoring, NSI 6000 support

**In-app purchases:** none


## Frequently asked questions

### Is TNFR free?

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

### Is NSI Pro free?

NSI Pro is free to download, with no in-app purchases.

### Which has better reviews, TNFR or NSI Pro?

TNFR is rated higher. TNFR averages 4.4 out of 5 from 58 ratings, while NSI Pro averages 3.0 from 2 ratings.

### Do TNFR or NSI Pro have ads?

Neither TNFR nor NSI Pro shows ads.

### Which is updated more often, TNFR or NSI Pro?

TNFR ships an update monthly, and NSI Pro every 2 weeks. Most recently, TNFR was updated on October 24, 2026 and NSI Pro on October 24, 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.*