Comparison

TSD Rally Clock vs Blackboard

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

TSD Rally Clock

Features
Read full description

The TSD Rally Clock allows you to synchronize to the Official Rally Time by making adjustments in increments of +/– 0.1seconds to account for total errors of as much as + or – 10 seconds. Touch the Lock icon to make clock adjustments. Adjust time ahead or behind as needed and, when finished, touch the Unlock icon to prevent unintended adjustments. Touch the double Arrows singly or continuously to make adjustments in +/– 0.1 second increments. When unlocked a chime will sound at 0 seconds and 30 seconds. This audible cue is helpful when synching with the Official Rally Clock. To clear the list of split times, touch the "Clear Log" button and answer the question "Yes." Start the rally by touching the clock face. Recording split times can be helpful for comparing your time at a checkpoint to the time recorded by the checkpoint staff. Or, the checkpoint staff could use this feature to record times as cars cross a checkpoint. Also, split times can be used to track time in what are called Regularity or Jogularity style rallies. The current split time and the cumulative time will be logged in a table and compare these times with those indicated on the route instructions to see how well you are maintaining the ideal pace. On the clockface displays, time can be measured in either seconds or decimal minutes. Additionally, there are two levels of time precision. One displays two digits for seconds or two digits for hundredths of a minute. For more precision, the other measures and displays seconds as two digits plus tenths of a second or three digits for thousandths of a minute. There are three watch face styles: black, yellow, and white.

About

Blackboard

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
Read full description

Blackboard-Stopwatch This app is a simple stopwatch with very large numbers. The app has only one button with 4 functions: start, stop, pause and reset. In conjunction with my Bluetooth device and a photocell it can be a good display panel for any type of race. In this way, the use has practically no limits. Advertising can be deactivated via the "In-app purchases" option. For the start/stop can be used an external Bluetooth-button. Further information at: http://filippo-software.de Supported languages: German, Italian, English

Screenshots

TSD Rally Clock4 screens
Blackboard2 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
TSD Rally Clock versus Blackboard: the parameters behind the verdict, then further details
ParameterTSD Rally ClockBlackboard
Price$4.99Free — better
Rating—2.0 (2 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—2 — better
Update frequencyFortnightly — betterEvery 4 months
AdsNo — betterYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size1 MB11 MB
Age rating4+4+
DeveloperMSYappsFilippo Gozza

In-app purchases

None

TSD Rally Clock

No in-app purchases

1 purchases

Blackboard

One-time1
  • Full version$2.99

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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