Diversity Calculator vs Certly
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Diversity Calculator
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Calculate the maximum demand, total full load and apply diversity. Enter your load values in Amps, Watts or kW, for three phase also select the phase for which the load applies to: L1, L2, L3 or L123. Calculation Reults: - Total Full Load - DL 1 (osg)= Calculates diversity based on the OSG. - DL 1 (custom) = Set your own diversity factor. - DL 2 = Applies the rule of thumb method. - DL 3 = Apply a usage factor to DL 1 (OSG). Other Features: - Custom Circuit: You can enter your own diversity factor and circuit description for "custom circuits". - Edit the default PF (power factor) value for applicable three phase circuits. - Print all results. How to calculate single phase diversity: 1) Select the distribution board type (Single Phase, Three Phase). 2) Select the type of premises. 3) Select the description of circuit / load. 4) Enter the load value (kW, Watts, Amps). 5) Add Load How to calculate three phase diversity: 1) As above but with the additional options to select phase, L1, L2 L3 or L123. A single phase (230v) and three phase (400v) diversity calculator. When adding multiple loads of the same type i.e. Cookers, socket-outlets etc. always enter the biggest load first, then the second largest load and then finally the remainder of the loads. This diversity calculator ( = DL 1 (osg) ) is based on the 18th edition On-Site Guide. The diversity calculations results with 3 results based on 3 different methods on applying and calculating diversity.
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 Diversity Calculator's $9.99. Certly also leads on update cadence (every 8 days vs every 6 months). Diversity Calculator'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; Diversity Calculator costs $9.99 up front. Certly sells 2 in-app purchases, starting at $19.99 per month. Diversity Calculator asks for nothing beyond the download.
Diversity Calculator ships an update every 6 months, Certly every 8 days. The most recent releases landed on October 24, 2026 and October 22, 2026 respectively.
| Parameter | Diversity Calculator | Certly |
|---|---|---|
| Price | $9.99 | Free โ better |
| Update frequency | Every 6 months | Every 8 days โ better |
| Ads | No | No |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 โ better | 15.0 |
| Further details โ not scored | ||
| Size | 2 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | Pro Certs Software Ltd | Certly |
In-app purchases
Diversity Calculator
No in-app purchases
Certly
- Certly Pro - Monthly$19.991 Month
- Certly Pro - Annual$199.991 Year
Questions
Is Diversity Calculator free?
Is Certly free?
Do Diversity Calculator or Certly have ads?
Which is updated more often, Diversity Calculator or Certly?
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