S7 Link vs FHEM
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
S7 Link
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A NEW APP, THE FUNCTIONS YOU KNOW โข All the functions and tabs of previous versions are kept: pushbutton panel, manual commands, variables, alarms, point tables, PLC links, CPU status, date and time, backup and sharing โข Updating keeps your connections, tables, options and purchases; backups made with iS7 can be restored SUPPORTED PLCS CPUs of the S7-300, S7-400, S7-1200 and S7-1500 families and LOGO!, reachable on the network through ISO on TCP (RFC 1006). S7-1200 and S7-1500 need PUT/GET access enabled and DBs without optimized access. IN-APP PURCHASE Alarm management on real PLCs is available as an in-app purchase. Whoever has already bought it keeps it. SAFETY S7 Link can write to PLCs and act on machinery in operation. Use it with care and at your own risk, and do not rely on it for safety functions. In the background, iOS decides when alarms are checked, and it can be hours apart. Requires iOS 26 or later. Siemens, SIMATIC and S7 are trademarks of Siemens AG. S7 Link is an independent product, not affiliated with or endorsed by Siemens.
FHEM
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FHEM-Remote is an app that allows to query status information and to switch hardware devices that are controlled by a FHEM home automation server. The app only works in combination with a FHEM server with active FHEMWEB web interface module and the jsonlist plugin (FHEM default installation). The app was developed especially for CUL_HM and HomeMatic components, but also (partially) supports other components like: FBDECT (AVM Fritz), FS20, FHT, CUL_FHTTK, ZWave, EnOcean, MAX, HUE, EIB, IT (InternTechno), HMS, KS300, CUL_EM, WEBIO, WEBIO_12DIGITAL, CUL_TX, OWDevice (1-wire), CUL_WS, OWTHERM, ... Features: - Display the status and basic information of all hardware devices (according to the FHEM configuration, sorted by room) - Simple direct operation of devices (same set of commands as the FHEM web interface) - Setting dim values - Setting the desired temperature of temperature devices (Homematic, MAX)
Screenshots
Verdict
The clearest difference is price: FHEM at Free against S7 Link's $14.99. FHEM also leads on update cadence (every 2 months vs every 4 months) and iOS requirement (12.0 vs 26.0). On ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
FHEM is free to download; S7 Link costs $14.99 up front. S7 Link sells 3 one-off in-app purchases and FHEM sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
S7 Link ships an update every 4 months, FHEM every 2 months. The most recent releases landed on November 10, 2026 and November 6, 2026 respectively.
| Parameter | S7 Link | FHEM |
|---|---|---|
| Price | $14.99 | Free โ better |
| Update frequency | Every 4 months | Every 2 months โ better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad | iPhone, iPad, iPod โ better |
| Requires iOS | 26.0 | 12.0 โ better |
| Further details โ not scored | ||
| Size | 10 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Carlo Trotti | Mirco Vitr |
In-app purchases
S7 Link
- Alarms$2.99
- Charts$2.99
- OPC Client$4.99
FHEM
- Remove Ads$1.99









