Cable Calc vs Certly
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Cable Calc
Calculate the minimum required cable size for single and three-phase circuits based on BS 7671 standards. Input design criteria, installation methods, and environmental factors to determine appropriate cable dimensions. Save or print detailed results for your projects.
- Calculate single and three-phase radial circuits
- Calculate single-phase ring final circuits
- Based on BS 7671 standards
- Enter design criteria
- Select cable type, installation method, ambient temperature, and grouping
- Save or print results
- Add circuit and client details
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A cable size calculator based on BS 7671 for calculating single phase and three phase radial circuits and single phase ring final circuits. Calculate the minimum required cable size based on the tables within BS 7671 and print or save the results. STEP 1: Enter your design criteria and select a cable type. STEP 2: Select an installation method, ambient temperate and grouping. Option to enter a circuit reference and circuit description. Option to enter a client name and installation address. Option to add a signatory. Check out our full collection of electrical apps & software packages for electricians at https://www.procertssoftware.com/apps/
Certly
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Certify smarter. Certify faster. Certly turns your iPad into a compliance certificate workstation. Built for electricians, fire alarm engineers and other trades who issue certificates on site, it replaces messy paperwork and clunky desktop tools with a single, fast app designed for the field. Whether you're issuing an EICR, minor works certificate, or fire detection and alarm system commissioning, Certly handles the full workflow โ from booking the job to handing over a signed PDF. What you can do with Certly โข Create compliant certificates in landscape on your iPad, with all the inputs structured the way the standards expect โข Manage clients and their properties โ quickly pull up history, contacts and previous work โข Schedule jobs and view them in a calendar that fits the way you actually plan your week โข Build templates for the certificates you issue most often, so a new cert is half-filled before you start โข Run auto quality checks that flag missing fields, inconsistencies and common errors before you sign off โข Capture site evidence with the iPad camera and attach photos directly to certificates โข Sign and have your customer sign on-screen โ no printing, no scanning โข Generate professional PDF certificates ready to email or hand over before you leave the site โข Stay in sync across devices โ pick up where you left off when you swap between iPads Designed for the way trades work: Certly is landscape-only on iPad because that's how you actually use a tablet on a job โ propped on a clipboard, on the bonnet of the van, or laid flat on a desk. The interface is dense where you need it (long forms with multiple inputs visible at once) and lean where you don't. Compliance you can trust: Certly's certificate structures track the canonical formats used in UK certification. The auto quality check engine reduces the most common reasons certificates get bounced back, so what you issue is right first time. Subscription: Certly is offered on a subscription. New users can try the app and review plans inside the app. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the billing period. Support: Need help getting set up or have a feature request? Get in touch from inside the Settings tab and we'll respond fast. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is price: Certly at Free against Cable Calc's $14.99. Certly also leads on update cadence (every 8 days vs every 4 months). Cable Calc's advantage is in-app purchases (none vs 2) and iOS requirement (11.0 vs 15.0). On ads 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
Certly is free to download; Cable Calc costs $14.99 up front. Certly sells 2 in-app purchases, starting at $19.99 per month. Cable Calc asks for nothing beyond the download.
Cable Calc ships an update every 4 months, Certly every 8 days. The most recent releases landed on September 30, 2026 and October 5, 2026 respectively.
| Parameter | Cable Calc | Certly |
|---|---|---|
| Price | $14.99 | Free โ better |
| Positive reviews | 16.7% of reviews | โ |
| Update frequency | Every 4 months | Every 8 days โ better |
| Ads | No | No |
| In-app purchases | No โ better | Yes |
| Monetization | Paid | โ |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 โ better | 15.0 |
| Further details โ not scored | ||
| Size | 3 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Pro Certs Software Ltd | Certly |
In-app purchases
Cable Calc
No in-app purchases
Certly
- Certly Pro - Monthly$19.991 Month
- Certly Pro - Annual$199.991 Year







