Drug Interactions vs COSA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Drug Interactions
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This app provides referenced information about drug interactions. On the one hand, you can get information about all interactions with a given medicine, and on the other hand, you can create and verify a prescription. The information is provided in the form of a memo including the level of dangerousness, the effect, the mechanism, the risk factors, the action to be taken and the bibliographical references. Substitution options with a nearby drug are also offered. The data required for this application is read from a remote and regularly updated server. You therefore need WiFi or cellular Internet access to view it.
COSA
Access essential drug information and advanced patient resources. This app provides a portion of licensed drug data from a leading healthcare information provider, based on industry-standard databases.
- Essential drug information
- Advanced patient resources
- Licensed drug data
- Industry-standard databases
- Physician-focused resources
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Find essential drug information & advanced patient resources. Physicians Office Resource licenses drug information data from First DataBank and provides a portion of it as a free service to its physician-users. First DataBank is the leading provider of electronic drug information to the healthcare industry. Based on the widely accepted industry standard — the National Drug Data File® — NDDF Plus databases are backed by the most clinically verifiable evidence gathered to date.
Screenshots
Verdict
The clearest difference is price: COSA at Free against Drug Interactions's $7.99. COSA also leads on iOS requirement (11.0 vs 16.0). Drug Interactions's advantage is ads (none vs shown). On update cadence, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
COSA is free to download; Drug Interactions costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.
| Parameter | Drug Interactions | COSA |
|---|---|---|
| Price | $7.99 | Free — better |
| Rating | — | 3.7 (3 ratings) — better |
| Number of ratings | — | 3 — better |
| Update frequency | Every 3 months | Every 3 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 28 MB |
| Age rating | +17 | 4+ |
| Developer | Pierre Chaillet | MEDICAL EDUCATION RESOURCES, LLC |
In-app purchases
Drug Interactions
No in-app purchases
COSA
No in-app purchases
Questions
Is Drug Interactions free?
Is COSA free?
Do Drug Interactions or COSA have ads?
Which is updated more often, Drug Interactions or COSA?
Other comparisons
