Legal

Privacy policy

Version 3.1 · Last updated 4 November 2026

1. Who we are

Ohmly is published by Proxime Technologies Ltd, registered in England and Wales, company number 17125907, registered office 71-75 Shelton Street, Covent Garden, London WC2H 9JQ. Contact us at privacy@ohmly.co.uk.

Under UK data protection law we are the controller for emails you send us and for the subscription records Google Play gives us (section 5). We decided to include the Google code described in sections 4 and 6, so the lawful bases given there are ours; Google is a separate controller of the information that code collects. You are the controller of the details you record about your own customers. Those details never reach us, so we are not your processor.

2. Your work stays on your device

Ohmly stores your work on your phone: your projects and circuit designs, customer and property details, test results, issued certificates, quotes as sent, invoices, photographs, business profile (including any bank details you add for your invoices), rates and settings.

We receive none of this. There is no Ohmly account and no copy on our servers, so we can neither see your work nor restore a lost copy.

3. Backups, and moving to a new phone

• Google Drive backup is off by default. You can switch Drive backup on in Settings, Back up and restore. Drive backup needs Android 12 or later, a screen lock on your phone, and Google backup switched on in your phone's own settings. Android then copies your records, signatures and settings to your own Google account, encrypted end to end with your screen lock, where Google's privacy policy applies. Photographs are never included, nor are the stored copies of issued certificates, invoices, deposit requests and kept quotes: Back up everything carries those. So after a restore from Drive, the record of an issued certificate, invoice or deposit request comes back but its issued file does not. Sharing such a certificate, invoice or deposit request sends a copy marked as reproduced from the record, not the copy you issued, and Ohmly tells you so first. A reproduced invoice or request leaves off your bank details, VAT number and UTR, because they may have changed since. If your phone runs an earlier version of Android, has no screen lock, or your records outgrow the 25 MB Android allows each app, nothing is copied and Ohmly tells you. Ohmly cannot see whether Google backup is on in your phone's settings, so please check there. You can switch Drive backup off at any time.
• Phone-to-phone transfer. On Android 9 and later, setting up a new phone from your old one carries your work across, photographs included. The copy goes directly between the two phones.
• Backup files. Settings, Back up and restore, Back up everything writes a file holding your projects, drawings, certificates with their signatures, invoices, test results, customers, business details and rates, and your photographs if you choose to include them. On Android 10 and later a copy is also saved in your phone's Downloads folder until you delete the copy; otherwise the file goes only where you choose to send a copy. Restore from a backup replaces all the Ohmly work on that phone, photographs included, with the contents of the file. A restore never switches Drive backup on. The older Export your records to a file option writes a file of your business details, rates and prices, jobs, circuits, certificates and test readings, without photographs or signatures. On Android 10 and later that file is also saved to Downloads. Restoring that file puts back only your business details and rates.

If you lose your phone without Drive backup switched on or a backup file kept somewhere else, your work cannot be recovered. Please keep a copy you control.

How your work is kept. Ohmly keeps your records, signatures, issued certificates and photographs in its own storage on your phone, which other apps cannot read. A Drive backup is encrypted end to end with your screen lock, as described above. A backup or export file is not encrypted, and neither is its copy in your Downloads folder, so keep each one somewhere only you can reach.

4. Advertising on the free plan

The free plan shows advertisements served by Google AdMob. Pro and Pro+ have no advertising, and Ohmly does not show the consent form on those plans.

Your choice. On the free plan, where the law asks for your consent to personalised advertising, Ohmly asks for it, using a form supplied by Google's consent service. Each time you open Ohmly on the free plan, the app asks Google's consent service for your current answer when you first reach the home screen, so Ohmly contacts Google even before you first answer. If you agree, Google may choose advertisements using information Google already holds about you. If you decline, you still see advertisements, but Google treats them as non-personalised. Your consent is our lawful basis for personalised advertising. If you decline, the non-personalised advertisements you still see rely on our legitimate interest in funding the free plan. Where the law asks for your consent, you can change your answer at any time in Settings, Advertising choices.

What Google collects. Google states that its advertising library collects: your IP address, which can indicate your general location; how you use the app, such as launches and taps; diagnostic information, such as launch time and energy use; and device identifiers, including your advertising ID and app set ID. The information is encrypted in transit. Google uses the information for advertising, analytics and fraud prevention, acts as the controller under Google's privacy policy, and may transfer the information outside the UK under Google's own safeguards. You can reset or delete your advertising ID in your phone's settings.

What we have limited. We have removed Android's ad-topics permission from Ohmly, so the advertising library cannot use Android's Topics feature in this app. Gambling and dating advertisements are blocked. We do not profile you or build audiences from your use of the app.

What is never shared. Nothing you put into Ohmly. No project, circuit, calculation, certificate, photograph, signature, customer, address or price goes to us or to any advertiser, or is used for advertising.

5. Payments, and emails you send us

Google Play takes subscription payments. We never see your card number, payment details or billing address. Google tells the app whether a subscription is active and gives us sales reports. Our lawful basis for subscription records is our contract with you, and the law that requires us to keep accounting records; we keep those records for six years.

If you email privacy@ohmly.co.uk, support@ohmly.co.uk or feedback@ohmly.co.uk, we use your message only to reply. The app's Send feedback button adds the app's version number. We keep emails only for as long as we need them to deal with the matter, then delete them. Our lawful basis is our legitimate interest in replying.

6. Analytics and diagnostics

Ohmly has no analytics or crash reporting of its own. We do not measure how you use the app, and nothing reports your activity or errors to us.

Google's code inside the app collects some diagnostic information for Google:

• The advertising library, which serves the free plan's advertisements (section 4).
• Google Play's billing library, on every plan. Each time Ohmly opens, the billing library checks your subscription, so that a cancelled, restored or delayed subscription is applied correctly; our lawful basis is our legitimate interest in keeping your plan accurate. The billing library also sends diagnostic information to Google's logging service, whatever your advertising choice. In our testing, the information covered: the library's version; the app's name and version; your phone's make, model and software version; your country, language, time zone and network type; and one value Google does not document. The information did not include your advertising ID, any account, or anything you entered in Ohmly.
• Google's text recognition, a component included in the app for reading consumer unit labels from a photograph, which this version of Ohmly does not offer. Ohmly starts the component only when a label is read, never when the app opens, so in this version it does not start and sends nothing. If it is started in a later version, on every plan, it sends Google information for diagnostics and usage analytics. Google states that this is: details of your phone (its maker, model and Android version, and its machine-learning hardware); the app's name and version; an identifier for this installation of the app, which Google says is not intended to identify you or your phone; and how the feature ran, such as its speed, its settings, the size of what it read and produced, its version, which events happened and any error codes. Google states that it encrypts this in transit and does not pass it to third parties.

Google handles all of this under Google's privacy policy.

7. Phone permissions

Ohmly uses each permission only for the feature named, and refusing one leaves the rest of the app working.

• Camera: Ohmly asks for no camera permission. To attach a photograph to a job or a checklist step, Ohmly opens your phone's own camera app, and the photograph you take comes back to Ohmly.
• Microphone: only when you tap a microphone button to speak a test reading: the one in the voice bar at the foot of a circuit's test screen, or the one beside a reading you are editing on the test schedule. Ohmly asks the first time you tap it, and if you refuse, you type readings as before. Online is the default: what you say is sent to your phone's online speech service to be turned into text, and that service's own terms apply. You can choose On-device in Settings, Voice entry, where your phone offers it, and Ohmly then uses your phone's on-device speech recognition. Ohmly never keeps the sound, only the reading you record. Because Online sends your voice off the phone, our answers in Google Play's Data safety section list voice recordings. Google's pages do not say how long an online speech service keeps what you say, so Ohmly makes no promise about that.
• Notifications: for reminders, such as a calibration or inspection reminder, or a summary of unpaid invoices or of deposit requests still waiting to be marked paid, which you can switch off in Settings. On Android 13 and later, Ohmly asks once, when you first set a reminder. If you refuse, the reminder screens offer a button that opens your phone's notification settings.
• Run at start-up: to put your reminders back after your phone restarts. Android grants this automatically.
• Network access: for the Google services in sections 3 to 6.
• Advertising ID and ad measurement: used by Google's advertising library on the free plan. Ad measurement lets Android report whether an advertisement led to an install or other action without identifying you across apps.

Ohmly and Google's libraries also use a few technical permissions, for example to check your network connection and to run reminders reliably. The full list is on the Google Play listing and in your phone's settings for Ohmly.

8. Sharing

We do not sell your information. On the free plan we are paid for advertising space, and Google collects the information in section 4 to fill that space. Otherwise, information leaves your phone only as described in sections 3 to 7, or when you export or share a document through your phone's share menu. Whoever receives a shared document then decides what happens to the document.

Our email and website providers, and Google, may process information outside the UK under safeguards that UK law recognises. Email privacy@ohmly.co.uk for a copy of those safeguards.

9. Your rights

UK data protection law gives you rights to access, correct, erase, restrict, port and object to the use of your personal information, and to withdraw consent at any time. Because we hold almost nothing about you, you exercise most of these rights in the app:

• Access and portability: everything is visible in the app, and Settings, Back up and restore, Back up everything gives you a copy.
• Correction: edit the record in the app.
• Erasure: Settings, Delete all data, or uninstall the app. Delete all data also switches Drive backup off but keeps your advertising choice. Neither removes copies held elsewhere: delete backup and export files from your phone's Downloads folder and from wherever you sent them, and delete any Drive copy from your Google account. The steps, and what is deleted and kept, are on one page: Delete your Ohmly data.
• Withdrawing advertising consent: Settings, Advertising choices, where the law asks for your consent.

For anything we do hold, such as an email from you, write to privacy@ohmly.co.uk. You also have the right to complain to the Information Commissioner's Office (ico.org.uk).

You never have to give us any information. On the free plan, advertising is part of how the app is funded. Ohmly makes no automated decision about you that has a legal or similarly significant effect.

10. Children

Ohmly is a professional tool for electricians and apprentices, some of whom are 16 or 17. Ohmly is not directed at younger children, and we do not knowingly collect information from them. Where the law asks for consent to personalised advertising, it stays off until the user agrees. On every plan that shows advertising, Ohmly asks Google for advertisements suitable for teenagers and above, and Pro and Pro+ have no advertising.

11. This website

This website sets no cookies, runs no analytics and contains no tracking scripts. Its fonts, images and code are all served from this domain, so visiting a page makes no request to anyone except our hosting provider. Our hosting provider keeps standard server logs, including IP addresses, for no more than 3 days, on our legitimate interest in keeping this website secure.

12. Changes, and contact

If we change this policy, we will update the date at the top of this page, and tell you in the app or on this website before a significant change takes effect. Privacy questions: privacy@ohmly.co.uk. Anything else: support@ohmly.co.uk.