S7 Link vs Unified
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
S7 Link
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A NEW APP, THE FUNCTIONS YOU KNOW • 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 • 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.
Unified
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This app allows hosting different HMIs to monitor and control a plant or machine. You can create the HMIs with the Unified-E App Designer and publish them on the Unified-E App Manager. Unified-E is a software product which is used to operate machines or plants with a smartphone. App development time is drastically reduced by using the "Unified-E App Designer" software, where you can define both the HMI views and push notifications for your individual HMI app. No app programming knowledge is required. There is a Gateway PC required which connects smartphone with machine and ensures that communication is secured and only granted for authorized users. The "Pro" license also allows operating a machine via the Internet without performing any configuration on the firewall or router. By now there are already multiple Unified-E endpoint adapters, e. g. for the S7-, ControlLogix-, Modbus- or OPC UA interface. The software, user manuals, licenses and further information can be found on the website ww.unified-e.com. For developers and integrators all licenses are for free.
Screenshots
Verdict
The clearest difference is price: Unified at Free against S7 Link's $14.99. Unified also leads on in-app purchases (none vs 3) and update cadence (every 4 weeks vs every 4 months). On ads 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
Unified is free to download; S7 Link costs $14.99 up front. S7 Link sells 3 one-off in-app purchases. Unified asks for nothing beyond the download.
S7 Link ships an update every 4 months, Unified every 4 weeks. The most recent releases landed on November 10, 2026 and November 11, 2026 respectively.
| Parameter | S7 Link | Unified |
|---|---|---|
| Price | $14.99 | Free — better |
| Update frequency | Every 4 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 10 MB | 189 MB |
| Age rating | 4+ | 4+ |
| Developer | Carlo Trotti | Unified-E AG |
In-app purchases
S7 Link
- Alarms$2.99
- Charts$2.99
- OPC Client$4.99
Unified
No in-app purchases
Questions
Is S7 Link free?
Is Unified free?
Do S7 Link or Unified have ads?
Which is updated more often, S7 Link or Unified?
Other comparisons
