Comparison

ChronoMaster vs C4Timekeeper

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

Head to head
About

ChronoMaster

This app is designed for classic car rally pilots and co-pilots to precisely navigate complex special stages. It offers 1/100s second accuracy for timing and distance, with a graphical interface to manage interlaced stages, average speed controls, and countdown timers.

Highlights
  • 1/100s second precision timing
  • Graphical interface for complex stages
  • Acoustic countdown timer
  • Automatic average speed calculation
  • Transfer stage data from roadbook
  • Bilingual interface (English/German)
Features
Read full description

A must have for the serious classic car rallye pilot & co-pilot with a passion to win. Classic car rallies are usually conducted as regularity rallies with so called "Special Stages" which require the pilot to drive a specific distance in a predefined time. Simple Special Stages comprise of just one sector (e.g. 100 meters in 10 seconds). However more serious rallies such as the Mille Miglia require you to master sets of complex, interlaced Special Stages or to maintain a predefined average speed across a stage. ChronoMaster lets you master even the most complicated special-stages of a classic car rallye with ease and 1/100s of a second precision. Don’t get distracted by confusing interlaced stages, secret average speed controls, light-barriers and tubes. ChronoMaster does what most expensive rallye-computers promise – at a fraction of the cost! And it is more intuitive to use on the iPad’s large & bright screen with a full graphical interface. - Transfer all data of a day’s special stages from the roadbook to the iPad before the rallye starts - Easy to use graphical interface to enter special stage data (time, distance, average speed) - Full graphical representation of special stage, including individual/interlaced sectors, light-barriers, tubes - Select the special stage from a list – and off you go! - Up to 15 sectors/special stage - Unlimited number of special stages - Acoustic countdown timer for last 10 seconds of special stage/sector (earphone recommended for driver) - Displays most important information during special stage: time to go, distance from start, distance to finish, average speed of stage/sector - Automatically calculates average speed based on stage-distance/time - No more stopwatch or average-speed tables required - Simple interface lets you concentrate on navigation and precision driving - Sector target time can be input with up to 1/10sec accuracy (e.g. 21.3 sec) - Maximum distance of a special stage is 99.999km - Zero-sync - start multiple sectors of a special stage at once - Start-buttons can be adjusted for left/righthand use (To use start-buttons most precisely during rallying on bumpy roads, place your thumb on the start button, hold it and release button upon start) - Bilingual user interface (English/German) Good luck and most of success with your next classic rallye! ==== Version History ==== v 1.3 NEW: Start-beep does now allow acoustic control of the start which will result in even higher precision during Special Stages. v 1.2 NEW: Up to 15 sectors/stage NEW: Larger digits in the countdown-timer for better usability NEW: English Version NEW: ChronoMaster's functionality is independent of units (kilometers/miles) - although it currently only displays metric units (km/m) just input Special Stage distances in miles as indicated in the roadbook (e.g. 3.7 miles), disregard the displayed "km" unit - and off you go! v 1.1 NEW: Sector target time can input now with 1/10sec accuracy (e.g. 21.3 sec) NEW: Maximum distance of a special stage now 99.999km NEW: Zero-sync - start multiple sectors at once

About

C4Timekeeper

Read full description

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

C4Timekeeper4 screens

Verdict

The call

The clearest difference is price: C4Timekeeper at Free against ChronoMaster's $64.99. C4Timekeeper also leads on update cadence (every 2 months vs every 9 months). ChronoMaster's advantage is in-app purchases (none vs 3) and iOS requirement (9 vs 16.0). 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; ChronoMaster costs $64.99 up front. C4Timekeeper sells 3 one-off in-app purchases. ChronoMaster asks for nothing beyond the download.

UpkeepUpdate frequency

ChronoMaster ships an update every 9 months, C4Timekeeper every 2 months. The most recent releases landed on September 26, 2026 and October 8, 2026 respectively.

Scorecard4 real differences · 4 level
ChronoMaster versus C4Timekeeper: the parameters behind the verdict, then further details
ParameterChronoMasterC4Timekeeper
Price$64.99Free — better
Positive reviews0.0% of reviews—
Update frequencyEvery 9 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaid—
DevicesiPadiPhone, iPad — better
Requires iOS9 — better16.0
Further details — not scored
Size4 MB10 MB
Age rating4+4+
DeveloperBrandsOnSpeed GmbHFilippo Gozza

In-app purchases

None

ChronoMaster

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 ChronoMaster free?
ChronoMaster costs $64.99, with no in-app purchases.
Is C4Timekeeper free?
C4Timekeeper is free to download, with in-app purchases available.
Do ChronoMaster or C4Timekeeper have ads?
Neither ChronoMaster nor C4Timekeeper shows ads.
Which is updated more often, ChronoMaster or C4Timekeeper?
ChronoMaster ships an update every 9 months, and C4Timekeeper every 2 months. Most recently, ChronoMaster was updated on September 26, 2026 and C4Timekeeper on October 8, 2026.

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