Medisafe vs CanIStackThis
Short version: they solve different problems, and plenty of people could sensibly use both. Medisafe is an adherence app: reminders, refill tracking, and caregiver alerts that help you actually take what you're prescribed. CanIStackThis is an interaction tool: it checks the supplements you take against each other and against your medications for known interactions. Two medications are checked against each other only where one of our rules covers that pair; any other medication pair is for your pharmacist, and the list says so. Their free plan is reported to cap how many medications you can track; our interaction checker is free for your whole list, up to 120 things.
Feature by feature (as of October 2026)
| Feature | Medisafe | CanIStackThis |
|---|---|---|
| Core question answered | "Did I take my meds on time?" (adherence) | "Do the things I take interact?" |
| Free medication/supplement limit | Third-party reports and user reviews describe a free plan capped at 2 medications since January 2026; we could not find the cap on Medisafe’s own site, so check in the app | One list of up to 120 things, checked free |
| Interaction checking | Yes: drug-to-drug interaction warnings (in the U.S., per their App Store listing) | Yes, supplement-focused: supplement with supplement, supplement with medication, and two medications only where one of our rules covers that pair; free for the whole list |
| Supplement-specific depth (label totals, upper limits) | Limited: built around prescriptions | Our specialty: daily totals and limits across all your products (from the NIH label database), with doubling-up warnings |
| Timing and spacing guidance | Not described on their website or App Store listing | Yes, free: My day spaces what you take |
| Condition-aware warnings (blood thinners, pregnancy…) | Not described on their website or App Store listing | Yes, free: the conditions you add with a free account apply to every check |
| Dose reminders | Excellent, their specialty (customizable alarms, refill reminders, within the free plan’s medication limit) | With a free account, My day’s calendar file puts your times in your phone’s own calendar |
| Caregiver/family support | Yes: Medfriend alerts a chosen person about missed doses | No |
| DNA report: what nine markers are linked to (MTHFR, COMT…) | Not described on their website or App Store listing | Yes: $29 once, or included with a year of Premium |
| Price | Free to download; paid plans are in-app purchases, among them a year at $39.99 on their App Store listing | Interaction checker free for a list of up to 120 things; Premium $9.99 a month |
| Platform | iOS and Android apps, Apple Watch, and a web login | Web + installable app |
When Medisafe is the better tool: you mainly need dose reminders and refill tracking for prescriptions, especially if a family member keeps an eye on you through Medfriend. Adherence is genuinely their specialty, not ours: we have no refill tracking or caregiver alerts, and if that's your main need, Medisafe is excellent.
When CanIStackThis is the better tool: your question is about the combination: whether your supplements interact with each other and with your medications, what to space apart, and where you're doubling up past upper limits. Interaction checking here is free for your whole list (up to 120 things), our interaction rules are written by hand and publicly documented, and we never sell supplements, run ads, or take affiliate commissions. Reminders are more their side than ours: with a free account My day gives you a calendar file that puts your times in your phone's calendar, and reminders we send ourselves go out only while we have sending switched on.
Every claim in the Medisafe column above was read off their own website and App Store listing, except where a row says it comes from third-party reports; last checked October 2026. We hold no inside information about their product and their plans can change without us noticing, so check their current prices in the app before deciding. Nothing here is sponsored and we take no commission either way. Medisafe is a trademark of its owner, which is not affiliated with CanIStackThis. Spot an inaccuracy? Tell us and we'll fix it. Educational information only, not medical advice.