The plant room has no signal. The paperwork does not care.
Basements, risers, farm outbuildings, half a mile of new-build with nothing on the mast yet. CertSync keeps working — you write the certificate where you did the work, and it syncs itself the moment you are back in range.
What still works with nothing on the bars
Your certificates download to the device automatically for offline work, and storage decides how many (250 MB by default; change it in Settings → Storage), so your dashboard and recent work open with no connection. You can start a certificate from scratch and fill in every schedule without a signal. Drafts save as you type, so there is no save button to forget. When the phone finds a network again, everything syncs in the background, photographs included: a photo taken with no signal is held encrypted on the device until it can be uploaded. Signing, approving and sending a certificate are completed once you are back on signal.
- Open recent certificates with no connection
- Create and fill in a new certificate offline
- Drafts save on the device as you type
- Pin completed certificates to keep them on the phone
- Background sync the moment you are back in range
The van, the office, and the same job.
It is one CertSync account across every device you sign in on, and one subscription — not a separate mobile product with a separate price and a subset of the features. A certificate started on the phone at four o’clock is the same record you open on the laptop at six.
All 13 certificate types are there, with the same fields and the same on-screen checks. Your account, your team and your billing are managed on the website.
On the phone that is already in your pocket.
Install it from your phone’s store, sign in with the account you already have, and your certificates are there.
Reading this on a desktop? Scan the code to open this page on your phone.
Working on a laptop or desktop? Nothing to install: sign in to CertSync in any modern browser with the same account.
The app — questions answered.
Is there a CertSync app on the App Store and Google Play?
Yes. CertSync is on the App Store and on Google Play, and both listings are linked from this page. You can also keep using CertSync in your browser — the app does not replace it.
Does it work with no signal?
Yes. You can create and fill in certificates with no connection. Your certificates download to your device automatically for offline work, and storage decides how many are kept (250 MB by default; change it in Settings → Storage). Drafts save as you type and sync in the background once you are back in range. Signing, approving and sending are completed once you are back on signal.
Do I need a separate subscription for my phone?
No. One CertSync account covers every device you sign in on. The subscription is From £15/month and your first month is free — a card is required for Core and Pro and you can cancel any time. The Free plan is for one person in the CertSync app and needs no card: you can draft, sign and preview certificates of all 13 types (every preview is marked DRAFT), but you can't issue, send or download them.
Which certificates can I write on a phone?
All 13 certificate types, with the same fields and the same checks as on a laptop. A phone screen is smaller, so long schedules are easier on a tablet, but nothing is withheld from the smaller screen.
Do photo uploads work offline?
Yes. A photo you take without a signal is stored encrypted on the device and uploads on its own once you reconnect — you do not have to reopen the certificate.
Can I still use CertSync in a browser?
Yes, and nothing about that changes. CertSync works in any modern browser with the same account, which is how a laptop or desktop uses it.
13 certificate types. Works offline. First month free.
Two plans from £15 a month. Your first month is free — a card is required for Core and Pro and you can cancel any time.
Want to look first? The Free plan is for one person in the CertSync app and needs no card: you can draft, sign and preview certificates of all 13 types (every preview is marked DRAFT), but you can't issue, send or download them.
CertSync is not currently VAT registered. The price you see is the total you pay.
2026-11-05