Comparison

TSD Rally Clock vs C4Timekeeper

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
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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

C4Timekeeper

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Stopwatch for timekeeper This app is a stopwatch for timekeeper of Oldtimer Rallye This app replaces the expensive stopwatch of Oldtimer Rally organizer. This app can be used by the timekeeper for the secret time control. On the external Bluetooth button (can be me ordered ) a photocell can be connected. A printer is not necessary, because you can send the times by e-mail to the organizers. Thus, need for evaluations, the organizers do not wait until the timer to come back. Synchronization of the clock: 1. Manually, using as a reference the time of the organizers. 2. GPS, using the satellite time. 3. The atomic time, using one of the many global or regional server. Functions: You can use for the Stop, the green software button "Start". For the Stop can also be used with an external bluetooth-button. The button works with all iPad e iPhone. Important! A photocell can at the input for the button to be connected (the contact is open). The external button, you can order from me, price see at https://filippo-software.de. Limitations of the Free-version: * A maximum. 5 times to stop. Supported languages: German, Italian, English

Screenshots

TSD Rally Clock4 screens
C4Timekeeper4 screens

Verdict

The call

The clearest difference is price: C4Timekeeper at Free against TSD Rally Clock's $4.99. TSD Rally Clock's advantage is in-app purchases (none vs 3) and update cadence (fortnightly vs every 2 months). On ads and 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

C4Timekeeper is free to download; TSD Rally Clock costs $4.99 up front. C4Timekeeper sells 3 one-off in-app purchases. TSD Rally Clock asks for nothing beyond the download.

UpkeepUpdate frequency

TSD Rally Clock ships an update fortnightly, C4Timekeeper every 2 months. The most recent releases landed on October 6, 2026 and October 8, 2026 respectively.

Scorecard4 real differences · 2 level
TSD Rally Clock versus C4Timekeeper: the parameters behind the verdict, then further details
ParameterTSD Rally ClockC4Timekeeper
Price$4.99Free — better
Update frequencyFortnightly — betterEvery 2 months
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.0 — better16.0
Further details — not scored
Size1 MB10 MB
Age rating4+4+
DeveloperMSYappsFilippo Gozza

In-app purchases

None

TSD Rally Clock

No in-app purchases

3 purchases

C4Timekeeper

One-time3
  • Full version for one month$4.99
  • Full version for 6 months$8.99
  • Full version for one year$13.99

Questions

Is TSD Rally Clock free?
TSD Rally Clock costs $4.99, with no in-app purchases.
Is C4Timekeeper free?
C4Timekeeper is free to download, with in-app purchases available.
Do TSD Rally Clock or C4Timekeeper have ads?
Neither TSD Rally Clock nor C4Timekeeper shows ads.
Which is updated more often, TSD Rally Clock or C4Timekeeper?
TSD Rally Clock ships an update fortnightly, and C4Timekeeper every 2 months. Most recently, TSD Rally Clock was updated on October 6, 2026 and C4Timekeeper on October 8, 2026.

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