# Tack On vs Cantus Pro

The clearest difference is update cadence: Cantus Pro at every 3 days against Tack On's every 9 days. On price, ads, in-app purchases and device support there is nothing between them.

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

Tack On ships an update every 9 days, Cantus Pro every 3 days. The most recent releases landed on October 10, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Tack On | Cantus Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cantus-pro/id6797874291/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 3 days** |
| Monetization | — | Subscription |
| Size | 110 MB | 4 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Tack On LLC](https://appshunter.io/developer/1789977887) | [Davis Moore](https://appshunter.io/developer/6797874293) |

## What reviewers say

### Tack On

[App page](https://appshunter.io/ios/app/tack-on/id6740439365)

**Features:** Apple Wallet

**In-app purchases:** none


### Cantus Pro

[App page](https://appshunter.io/ios/app/cantus-pro/id6797874291)

Manage all aspects of your piano technician business, from client details and service history to scheduling, invoicing, and financial insights. Track instruments, log expenses, and generate reports, all accessible offline.

**Highlights:** Client management, Recall and reminders, Appointment scheduling, Invoice and payment processing, Income and expense tracking, Instrument inventory, Offline functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is Tack On free?

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

### Is Cantus Pro free?

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

### Do Tack On or Cantus Pro have ads?

Neither Tack On nor Cantus Pro shows ads.

### Which is updated more often, Tack On or Cantus Pro?

Tack On ships an update every 9 days, and Cantus Pro every 3 days. Most recently, Tack On was updated on October 10, 2026 and Cantus Pro on October 9, 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.*