F4 PLUS vs F4 SLIM
Smart Taximeter Comparison for Modern Taxi Fleets
- Novembre 21, 2025
- 5:52 pm
F4 Plus and F4 Slim stand out as two complementary approaches to smart taximeters: a full-featured all-in-one unit with integrated thermal printer and a compact certified device designed for flexible installations.
In this article, we take a closer look at how their design, printing capabilities, connectivity options and certifications impact daily operations, and how taxi operators can decide whether an all-in-one smart taximeter or a slim, lightweight form factor is the best fit for their fleet strategy.
1. Overview
This F4 Plus vs F4 Slim smart taximeter comparison helps modern taxi fleets choose the right certified device. It reviews the key features of the F4 Plus and F4 Slim smart taximeters, highlighting their distinctive characteristics, certifications, and ideal use cases. Both models are engineered by Digitax to meet European standards for professional taxi operations, ensuring accuracy, reliability, and full compliance with international regulations.
Both models share the same certified architecture and smart functionality but differ in design and integration.
Here’s how they compare at a glance:
F4 Plus — a full-featured, all-in-one Smart Taximeter with a built-in thermal printer, GNSS, Bluetooth, and 4G/5G connectivity. Designed for regulated taxi fleets that require integrated fiscal printing and standalone operation.
F4 Slim — a compact, lightweight taximeter with external printer compatibility (Digitax TRE / QUATTRO), ideal for space-saving installations and modular system configurations.
Both devices are fully certified (MID, OIML R21, E-Mark) and support Over-The-Air (OTA) tariff updates, Digitax SDK integration, and remote fleet management via Digitax Device Track.
TABLE of CONTENTS
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OverviewOverview
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Feature ComparisionFeature Comparision
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Different Forms, Same Certified CoreDifferent Forms, Same Certified Core
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Certified Connectivity and SafetyCertified Connectivity and Safety
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Fleet Management with Digitax Device TrackFleet Management with Digitax Device Track
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Which Model Fits Your Fleet?Which Model Fits Your Fleet?
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ConclusionConclusion
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FAQFAQ
2. Feature Comparision
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FEATURE
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F4 PLUS
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F4 SLIM
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Looking for an External Printer for your F4 SLIM?
3. Different Forms, Same Certified Core
The F4 Plus and F4 Slim share the same electronic core and certified architecture but differ in how they adapt to real-world taxi operations.
The F4 Plus stands out as a self-contained unit with all components integrated within a sealed housing. It combines precision fare calculation, real-time data communication, and fiscal printing in one certified device — perfect for fleets operating under strict compliance or fiscal regimes.
Meanwhile, the F4 Slim brings the same intelligence to a smaller, modular design. Its light and adaptable form factor makes it ideal for compact dashboards or vehicles using distributed peripheral systems, while still guaranteeing certified accuracy and full compatibility with Digitax management platforms.
4. Certified Connectivity and Safety
Both models deliver smart connectivity and advanced safety monitoring, combining:
GNSS and GPS tracking for accurate positioning, tariff management, and anti-tampering verification;
9-axis inertial sensors that monitor acceleration, braking, and impact to enhance driver and passenger safety;
4G LTE / 5G Cat-M modem for seamless communication with fleet, fiscal, or emergency servers;
Over-The-Air (OTA) updates for tariffs and firmware, ensuring continuous optimization and minimal downtime.
Through these capabilities, F4 Plus and F4 Slim set a new benchmark for secure, connected, and intelligent metrology in professional taxi operations.
Digitax smart taximeter connectivity diagram
illustration showing the connection of the digitax taximeter to vehicle systems and devices including lte gps smart box mdt pc mobile app and contactless modules
5. Fleet Management with Digitax Device Track
When paired with Digitax Device Track, both models become fully connected devices within a unified ecosystem.
Fleet operators can:
Supervise vehicles in real time (position, route, speed, and job status);
Perform OTA updates to thousands of units simultaneously;
Use remote control features like device locking/unlocking for operational security;
Access detailed driver and trip analytics to enhance productivity and compliance.
This integration transforms the taximeter from a standalone device into a smart mobility hub, empowering taxi companies to operate more efficiently and securely.
6. Which Model Fits Your Fleet?
Choose F4 Plus if you need a standalone, all-in-one system with integrated printer and full fiscal autonomy.
Choose F4 Slim if you prefer a compact, modular setup with external peripherals and flexible configuration.
Both are built on the same Digitax Smart Mobility DNA — delivering certified precision, reliable connectivity, and future-proof design for the evolving mobility landscape.
7. Conclusion
The F4 Plus and F4 Slim represent two complementary solutions within the Digitax Smart Taximeter range — sharing the same core technology, certification, and reliability, while addressing different operational needs.
With advanced connectivity, OTA management, and integration with the Digitax Device Track platform, both devices ensure that taxi fleets remain compliant, efficient, and connected in every condition.
Whether you choose the integrated power of F4 Plus or the flexible design of F4 Slim, both taximeters embody the Digitax vision:
smart, secure, and certified mobility built for the future.
Want to go deeper into taximeter technology?
10. FAQ
The key difference lies in the printing configuration.
F4 Plus integrates a built-in 50 mm thermal printer, making it a self-contained unit for fiscal and operational needs.
F4 Slim, instead, is printer-free and designed for use with external printers (Digitax TRE or QUATTRO), allowing more flexible installations in vehicles with limited space.
Yes. Both F4 Plus and F4 Slim comply with MID (EU), OIML R21, and E-Mark certifications, ensuring they meet all European metrological and automotive standards.
Absolutely. Both models support Over-The-Air (OTA) updates for tariffs, firmware, and configurations via Digitax Device Track, allowing fleet operators to manage hundreds of vehicles remotely without workshop visits.
Yes, both models feature GPS, Bluetooth, and 4G LTE / 5G Cat-M connectivity (standard on F4 Plus, optional on F4 Slim). This ensures real-time communication, positioning, and data exchange with fleet servers or fiscal authorities.
The F4 Slim supports connection to Digitax external thermal printers:
These devices ensure the same printing speed and fiscal accuracy as the built-in unit on F4 Plus, while providing flexibility for custom or space-saving installations.
Yes. Both F4 models are compatible with the Digitax SDK, enabling developers and fleet managers to integrate custom applications and expand their smart mobility solutions.
Both taximeters include 9-axis inertial motion sensors and GPS-based anti-tampering algorithms.
These features detect sudden acceleration, impacts, or unusual driving patterns — enhancing driver behavior monitoring, passenger safety, and accident prevention.
Yes. Through Digitax Device Track, fleet operators can:
Monitor vehicles in real time (position, route, trip data);
Send OTA updates instantly to all units;
Perform remote locking/unlocking;
Access complete trip and driver analytics for compliance and optimization.
You can learn more about the Digitax ecosystem and discover related products:
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