Instrumentation Directory vs CDA Secure Comms
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Instrumentation Directory
This specialized annual directory connects instrumentation professionals with purchasers and specifiers of control, sensors, and test equipment. It serves as a comprehensive reference guide for the industry, evolving with market trends since its 2002 launch.
- Specialized annual directory
- Connects purchasers and specifiers
- Covers control, instrumentation, sensors
- Includes test & measurement equipment
- Industry reference guide
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Brought to you by the Publishers of Instrumentation Monthly Magazine... The Instrumentation Directory is the specialised annual directory for Instrumentation professionals. Launched in 2002 the Instrumentation Directory has evolved and grown with the market sector it serves. You can discover both purchasers and specifiers of all types of control, instrumentation, sensors and test & measurement equipment, within the pages of the directory, offering you a must have reference guide.
CDA Secure Comms
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Delivered by Central District Alliance, CDA Secure Comms is an ISO 27001 encrypted platform created exclusively for security stakeholders across the central London business districts of St Giles, Bloomsbury, Holborn, Hatton Garden, Farringdon & Clerkenwell. The multi-channel software supports crisis response teams and security personnel to share real-time intelligence in the event of a major emergency, incident, or crime; enabling users to securely send GDPR compliant messages, images and videos instantly.
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Verdict
Instrumentation Directory and CDA Secure Comms are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
Both ship on a similar rhythm, roughly every 9 months. The most recent releases landed on September 14, 2026 and September 11, 2026 respectively.
| Parameter | Instrumentation Directory | CDA Secure Comms |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 9 months | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 29 MB | 34 MB |
| Age rating | 4+ | 4+ |
| Developer | Datateam Business Media Ltd | Central District Alliance Ltd |
In-app purchases
Instrumentation Directory
No in-app purchases
CDA Secure Comms
No in-app purchases
Questions
Is Instrumentation Directory free?
Is CDA Secure Comms free?
Do Instrumentation Directory or CDA Secure Comms have ads?
Which is updated more often, Instrumentation Directory or CDA Secure Comms?
Other comparisons
