Si vs InterFast
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Si
This application connects to specific Sauermann instruments to display real-time measurement data on your smartphone. It allows you to manage, save, and export measurement datasets in various formats, including PDF, CSV, and XML.
- Real-time measurement display
- Data management
- Report generation
- Export to PDF, CSV, XML
- Bluetooth connectivity
- Measurement of temperature, humidity, pressure, air velocity
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Si-HVACR Measurement MobileApp delivers a user-friendly experience for the Si-TT3 / Si-TI3 / Si-HH3 / Si-VV3 / Si-VH3 / Si-PM3 Sauermann instruments. This app displays on your smartphone screen all the results in real time and allows the management of measurement datasets over a duration of your choice, to create reports to be saved and exported in PDF, CSV or XML format. Si-HVACR Measurement MobileApp relays the following measurements: - Temperature (thermocouple, NTC, ambient, infrared) - Relative humidity - Pressure - Air velocity - Calculated parameters (air velocity, airflow, dew point, absolute humidity, enthalpy, mixing ratio, wet bulb temperature). Convenient data transmission is ensured by low-consumption 4.2 Bluetooth® with a maximum open-field range of 49’ (15 meters).
InterFast
This all-in-one construction app simplifies business management with tools for quotes, invoices, and client portals. It offers features for project planning, site management, and financial tracking, including bank connections.
- Quotes, Invoices, Credit Notes
- Price Library
- Treasury & Bank Connection
- Scheduling
- Site & Intervention Management
- Client Management & Portal
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La solution la plus simple et la plus complète qui s'adapte à chaque métier du bâtiment. Plus besoin de payer plusieurs outils, place au tout-en-un ! - Devis · Facture · Avoir - Bibliothèque de prix - Nouveau : Trésorerie et connexion bancaire - Planification - Gestion Chantiers · Maintenances · Interventions - Gestion des clients · Portail client
Screenshots
Verdict
The clearest difference is review sentiment: InterFast at 100% against Si's 0%. InterFast also leads on update cadence (every 2 weeks vs every 6 months). Si's advantage is iOS requirement (12.4 vs 15). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
Si ships an update every 6 months, InterFast every 2 weeks. Both last shipped on November 3, 2026.
| Parameter | Si | InterFast |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 — better | — |
| Update frequency | Every 6 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.4 — better | 15 |
| Further details — not scored | ||
| Size | 55 MB | 61 MB |
| Age rating | 4+ | 4+ |
| Developer | SAUERMANN INDUSTRIE | Interfast |
Customer experience
Si
InterFast
In-app purchases
Si
No in-app purchases
InterFast
No in-app purchases
