# TSD Rally Clock vs Blackboard

The clearest difference is price: Blackboard at Free against TSD Rally Clock's $4.99. TSD Rally Clock's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

Blackboard is free to download; TSD Rally Clock costs $4.99 up front. Blackboard sells 1 one-off in-app purchase. TSD Rally Clock asks for nothing beyond the download.

TSD Rally Clock ships an update fortnightly, Blackboard every 4 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | TSD Rally Clock | Blackboard |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[2.0 (2 ratings)](https://appshunter.io/ios/app/blackboard-stopwatch/id1470227478/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Fortnightly** | Every 4 months |
| Monetization | — | Free with in-app purchases |
| Size | 1 MB | 11 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MSYapps](https://appshunter.io/developer/458482419) | [Filippo Gozza](https://appshunter.io/developer/954580932) |

## What reviewers say

### TSD Rally Clock

[App page](https://appshunter.io/ios/app/tsd-rally-clock/id979445821)

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

**In-app purchases:** none


### Blackboard

[App page](https://appshunter.io/ios/app/blackboard-stopwatch/id1470227478)

A straightforward stopwatch app featuring oversized digits for easy visibility. It offers single-button control for starting, stopping, and resetting. With optional Bluetooth integration and a photocell, it can function as a race display, expanding its utility.

**Highlights:** Oversized digits, Single-button control (start, stop, reset), Bluetooth device integration, Photocell compatibility, External Bluetooth button support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version | $2.99 | one-time |


## Frequently asked questions

### Is TSD Rally Clock free?

TSD Rally Clock costs $4.99, with no in-app purchases.

### Is Blackboard free?

Blackboard is free to download, with in-app purchases available.

### Do TSD Rally Clock or Blackboard have ads?

Blackboard shows ads; TSD Rally Clock does not.

### Which is updated more often, TSD Rally Clock or Blackboard?

TSD Rally Clock ships an update fortnightly, and Blackboard every 4 months. Most recently, TSD Rally Clock was updated on November 6, 2026 and Blackboard on November 3, 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.*