RallyOdoTimer vs Blackboard
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RallyOdoTimer
This GPS-based rally odometer offers Halda Twinmaster-like functionality for tracking main and auxiliary mileage. It features adjustable counters, interval timers, and customizable settings for units and timer behavior. Swipe controls prevent accidental button presses.
- Dual mileage counters (main and auxiliary)
- Adjustable mileage increments
- Interval timers with customizable settings
- GPS monitoring with accuracy display
- Swipe controls for reverse and stop buttons
- KM/Miles unit selection
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A GPS based rally odometer with Halda Twinmaster-like functions. Upper counter is for main mileage. Lower counter is for auxiliary and interval mileage. Start button starts GPS monitoring. When started the text is green. Stop button stops GPS monitoring. Upper Counter mileage can be changed by 1, .1 and .01 buttons. Z-Aux sets the trip meter to zero. Split OM displays mileage when button was pressed and also resets trip. Factor field when pressed brings up a numeric entry field to edit the factor. Set Factor sets the factor to the value in the factor field and closes numeric entry. Chevrons set direction of mileage GPS Accuracy displays a count of how many GPS readings since last zero or start. Also displays the horizontal accuracy of the new and old GPS readings. The reverse buttons and stop buttons are activated by swiping rather than pushing in order to prevent inadvertent actions. Mileage is updated about once a second. Two interval timers. Functions can be set in settings KM/Miles Each timer/clock can be set to run in seconds or cents. Z-Aux zeros lower counter GPS/0 starts GPS and zeros both counters. Each timer/clock can be set to read in seconds or cents. Timer functions Timers are self resetting interval timers. Clear set;s them both to 0.00 and stops them. T1 wait delays the start of timer 1 until the top of the minute. Stop and start stops current timer and starts other timer at 0.00 Pause and start stops timer 1 and stars timer2. Pressing pause again starts timer 1 where it left off.Useful for pauses. Continued use of GPS running in the background can dramatically decrease battery life. If you plan to use for extended periods of time run with the charger connected.
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.
- Oversized digits
- Single-button control (start, stop, reset)
- Bluetooth device integration
- Photocell compatibility
- External Bluetooth button support
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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
Verdict
The clearest difference is review sentiment: RallyOdoTimer at 100% against Blackboard's 0%. RallyOdoTimer also leads on rating (5.0 vs 2.0) and in-app purchases (none vs 1). Blackboard's advantage is update cadence (every 4 months vs every 13 months). On price, ratings volume 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
Both are free to download. Blackboard sells 1 one-off in-app purchase. RallyOdoTimer asks for nothing beyond the download.
RallyOdoTimer holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 100% of RallyOdoTimer's written reviews are positive against 0% of Blackboard's.
RallyOdoTimer ships an update every 13 months, Blackboard every 4 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | RallyOdoTimer | Blackboard |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 2.0 (2 ratings) |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 2 | 2 |
| Update frequency | Every 13 months | Every 4 months — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 8.3 — better | 16.0 |
| Further details — not scored | ||
| Size | 5 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Clarence Westberg | Filippo Gozza |
Customer experience
RallyOdoTimer
Blackboard
In-app purchases
RallyOdoTimer
No in-app purchases
Blackboard
- Full version$2.99
