If you are looking for a medical cannabis tracking app, you have probably noticed there are not many built specifically for UK patients. And among the ones that exist, not all are equally trustworthy with your data.
Privacy is the place where the gap between a good app and a risky one shows up fastest, so that is where this comparison starts. Offline support, data export, and a transparent business model matter too, and each is covered below.
1. Privacy and data handling
Your cannabis tracking data is sensitive. It reveals your prescription, your consumption patterns, and potentially your medical history. Before you sign up for any app, check the privacy policy for these essentials:
- Does the app sell or share your data? Some free apps monetise user data. If the business model is unclear, your data may be the product. Look for a clear, explicit statement that your data is not sold or shared.
- Where is the data stored? Ideally within the UK or EU, under GDPR-level protections. If the company is based outside the UK, data transfer rules may be different.
- Can you delete your data? Account deletion should mean complete deletion — not deactivation or anonymised retention. The option should be self-serve and in-app, not something you have to email support to request.
- Can you export your data? Data portability is a UK GDPR right. You should be able to download your full history as CSV or JSON at any time.
Grams Left publishes a full visual overview of what data we collect, where it goes, and what we never share — worth a look if you want to see what good privacy practice looks like in a tracking app.
2. Offline support
Medical cannabis tracking is not always done at a desk with reliable Wi-Fi. You might need to log a dose while out and about, in a place with poor signal, or late at night when your phone is in aeroplane mode. Offline support — the ability to log doses without an internet connection — is essential for consistent tracking.
Apps that require a constant connection will lose entries when you are offline, which creates gaps in your data and makes your stock estimates unreliable. Look for an app that caches entries locally and syncs them when you are back online. Progressive Web Apps (PWAs) that can be installed to your home screen are particularly good at this.
3. Core tracking features
Beyond privacy and offline support, the tracking itself needs to be useful. Here are the features that make a real difference day to day:
- Stock tracking. Can you see at a glance how much you have left across all your products? Does the balance update automatically with every dose?
- Burn rate. Does the app calculate your average daily consumption? This is essential for knowing whether you are on track.
- Prescription countdown. Can you see how many days remain at your current pace? This is one of the most practical features for avoiding running out.
- Multi-product tracking. If you have more than one strain or format on your prescription, can the app handle them all?
- Quick logging. Does logging a dose take seconds on your phone, or does it feel like filling in a form?
4. Transparent business model
If an app is free, ask how it makes money. There are honest answers — advertising (clearly labelled), premium tiers, or optional donations — and there are dishonest ones, like quietly selling user data to third parties.
Grams Left is free for the core tracker. Plus is a paid subscription for deeper features like per-strain tracking and advanced stats. The model is transparent because we want you to trust it: we charge for features, not your data.
5. UK-specific design
Many cannabis apps are built for the North American market, where the legal and medical context is different. Look for an app that understands UK prescriptions, UK clinics, and UK data protection law. An app built for recreational users in California may not handle your medical records with the care UK GDPR requires — and it may not even know what a prescription countdown is.
The bottom line
A good tracking app earns your trust through transparency, respects your privacy by design, and makes logging so easy that you actually stick with it. If you are evaluating options, ask the questions above. And if you want a tracker built for UK patients, with privacy as a foundation and a free core tier, start tracking with Grams Left — no card required.