Comparison

S7 Link vs FHEM

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

Head to head
About

S7 Link

Features
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A NEW APP, THE FUNCTIONS YOU KNOW โ€ข 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 โ€ข 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.

About

FHEM

Features
Read full description

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

S7 Link4 screens
FHEM4 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences ยท 3 level
S7 Link versus FHEM: the parameters behind the verdict, then further details
ParameterS7 LinkFHEM
Price$14.99Free โ€” better
Update frequencyEvery 4 monthsEvery 2 months โ€” better
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad, iPod โ€” better
Requires iOS26.012.0 โ€” better
Further details โ€” not scored
Size10 MB16 MB
Age rating4+4+
DeveloperCarlo TrottiMirco Vitr

In-app purchases

3 purchases

S7 Link

One-time3
  • Alarms$2.99
  • Charts$2.99
  • OPC Client$4.99
1 purchases

FHEM

One-time1
  • Remove Ads$1.99

Questions

Is S7 Link free?
S7 Link costs $14.99, and also offers in-app purchases.
Is FHEM free?
FHEM is free to download, with in-app purchases available.
Do S7 Link or FHEM have ads?
Neither S7 Link nor FHEM shows ads.
Which is updated more often, S7 Link or FHEM?
S7 Link ships an update every 4 months, and FHEM every 2 months. Most recently, S7 Link was updated on November 10, 2026 and FHEM on November 6, 2026.

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