Five supplement apps and services compared, ranked by data transparency, drug interaction checking, and honest pricing — with honest trade-offs for each.
We compared five supplement apps and services for 2026, including one that has shut down.
Some apps in this category put a long quiz before the paywall, or score supplements with proprietary systems that do not show their sources. The ranking below weights transparency, drug interaction checking, and honest pricing heavily.
Full disclosure: we make one of the apps on this list — StackSnap, ranked first. We've tried to be honest about where competitors win.
Ranking criteria
Data transparency & source verifiability (30%) — NIH DSLD vs proprietary databases, sourceable ingredient data, no opaque "TrustScores"
User satisfaction signals (10%) — recent review sentiment, weighted toward last 90 days
The ranking
Best supplement tracker apps — 2026
01
StackSnap — Best for honest tracking with drug interaction checks
Best for: users on prescription medications who want supplement interaction checking, wellness enthusiasts tracking complex stacks who want dollar savings instead of scores, anyone who wants to try the full app for 7 days before paying.
StackSnap leads on three features no other consumer supplement tracker matches: a dollar savings counter (quantifies money saved monthly via duplicates avoided, doses above the upper limit flagged, cheaper alternatives identified, low-evidence supplements flagged), RxNav-powered drug interaction checks (public NIH data), and NIH DSLD source-verifiable ingredient data (no proprietary TrustScores — every data point traces back to a public government database entry). Plus a doctor-ready 1-page PDF export, multi-marketplace pricing across iHerb/Amazon/Vitacost, and a 7-day free trial without quiz-before-paywall dark patterns.
4.8★ · 12 ratings · $4.99/wk or $39.99/yr · 7-day full Pro trial · iOS 17+
Where it loses: smallest review base in the top 3 (12 vs 18,780 for SuppCo), iOS 17+ requirement excludes older iPhones, English-only at launch.
SuppCo — Best for established users and TrustScores
Best for: users on older iPhones (iOS 15+), users who value the largest review base, users who prefer simple aggregated scores over detailed ingredient data.
The category leader by review count — 18,780 ratings, ~4.7-star average. Solid AI-based identification, proprietary "TrustScore" system that rates supplements 1-10. Established two-year track record with hundreds of thousands of users. Annual subscription approximately $69-79.
Where it falls short: no drug interaction checker (significant gap for anyone on prescriptions), proprietary TrustScores that change without explanation, no dollar savings quantification, no doctor PDF export, quiz-before-paywall flow rather than instant trial. For experienced users wanting actionable financial information and prescription safety, the missing features are the gap that put StackSnap ahead.
Best for: users curious about new AI-driven supplement apps from established studios.
Launched in October 2025 by AIBY, a studio that publishes several identifier apps. 224 reviews, 4.5-star average.
Where it falls short: it is still new and has fewer features than SuppCo or StackSnap. No drug interaction checker. No source-verifiable ingredient data (proprietary). Worth checking in 12 months as they iterate.
Care/of — Now defunct, but historically important context
Status: Care/of shut down their subscription service in 2024 in 2024, four years after Bayer acquired it. Users who had built complex stacks in the app lost data access at the same time.
Worth mentioning because what happened at Care/of is a useful lesson when you choose a supplement tracker: if your data lives in a cloud-only system, and the company shuts down or has an account issue, your tracking history can disappear. StackSnap stores your data on your iPhone, so it stays available if your subscription ends.
If you're choosing between current apps, ask yourself: where does my data live, and what happens if the company has problems? The answer matters more than it seems before you've experienced the alternative.
05
Prove It — Read recent reviews before subscribing
Status: Prove It launched in January 2025 and has a large review base. Many recent reviews mention the paywall, the free trial and cancelling, so read the latest reviews and the subscription terms before you start.
If you are considering Prove It, check its latest reviews and terms first. StackSnap offers a 7-day free trial with no quiz before the paywall. We make sure you can see the app before you pay for it.
Each app was evaluated hands-on against five criteria weighted by importance to users making real health and financial decisions.
App
Drug interactions
Source-verifiable data
Savings counter
Doctor PDF
Honest free trial
Annual price
StackSnap
RxNav (NIH)
NIH DSLD
Dollars
Yes
7 days, no quiz
$39.99
SuppCo
No
Proprietary
TrustScore only
No
Quiz then paywall
~$69–79
InSup (AIBY)
No
Proprietary
No
No
Limited free tier
~$49–69
Care/of
Defunct
N/A
N/A
N/A
N/A
N/A
Prove It
Limited
Proprietary
No
No
Check current terms
~$99–200
What no supplement tracker app can do (yet)
Provide medical advice — all apps are general wellness tools, none are medical devices. Always consult a healthcare professional for decisions.
Detect counterfeit supplements — requires lab testing of contents. Apps read labels, not what's actually in the bottle.
Predict individual responses — supplements work differently in different bodies based on genetics, gut microbiome, existing nutritional status, and prescriptions. No app can predict your individual response.
Replace pharmacist clinical judgment — interaction flags are screening tools; final clinical decisions require a pharmacist or doctor.
The recommendation
For most supplement users in 2026:
If you take any prescription medication, StackSnap is the only app here with a full drug interaction check, useful as a screening step before you talk to your pharmacist.
If you take no prescriptions and just want supplement tracking with a big review base, SuppCo works fine — pay the price premium for established polish.
If you're currently using Prove It and frustrated, StackSnap is an alternative worth trying — honest 7-day trial, no quiz, transparent pricing.
Download StackSnap for the 7-day free trial. Scan your shelf in 20 minutes. If it finds at least one duplicate or one interaction you didn't know about, the value is proven. If not, cancel before the trial ends.
Questions
Frequently asked questions
Why is StackSnap ranked first even though you make it?
We ranked based on five criteria weighted by user value: data transparency, drug interaction checking, honest pricing, feature depth, and user satisfaction signals. StackSnap is the only app in the category with RxNav-powered drug interaction checking and NIH DSLD source-verifiable ingredient data. We've disclosed our conflict of interest prominently and tried to be honest about where competitors win.
Is SuppCo worth using if I'm not on prescription medications?
Yes. SuppCo has 18,780 ratings and ~4.7-star average — far more user validation than StackSnap's 12 ratings. If you take no prescriptions and just want solid supplement tracking, SuppCo's established polish and large user base are real advantages. The main trade-offs: proprietary TrustScores instead of source-verifiable data, no dollar savings quantification, and a quiz-before-paywall onboarding flow. Annual plan runs ~$69–79 vs StackSnap's $39.99.
What happened to Care/of?
Care/of shut down their subscription service in 2024 after an acquisition by Bayer didn't pan out. Users who had built complex stacks in the app lost data access. The lesson for current app selection: ask where your data lives and what happens if the company has problems. StackSnap uses SwiftData local-first storage that persists even after subscription cancellation.
What should I know about Prove It?
Many recent Prove It reviews mention the paywall, the free trial and cancelling. It launched in January 2025 and has a large review base. If you are looking for an alternative, StackSnap has a 7-day trial with no quiz.
What does "RxNav-powered drug interaction checking" mean?
RxNav is a drug information service from the U.S. National Library of Medicine, part of NIH. StackSnap queries this database when you log supplements alongside prescription medications, flagging known interactions by severity. It's a screening tool, not a substitute for pharmacist or doctor advice, but it's the same underlying data professionals reference.
Try the #1 ranked supplement tracker free for 7 days.
7-day free trial · $4.99/week or $39.99/year · cancel anytime in Apple Settings · iOS 17+
Editorial ranking disclosure. This is an editorial ranking produced by Loveiko Labs, the developer of StackSnap. We have a financial interest in StackSnap's success and have disclosed this conflict prominently throughout this page. Rankings reflect our honest assessment of each app against published criteria; we've tried to accurately represent where competitors win.
Ratings, prices and features were last checked in May 2026 and may have changed. Each app's developer may update features and pricing at any time. Verify current information at each app's App Store page before subscribing.
Not medical advice. None of the apps in this category are medical devices. Always consult a healthcare professional for medical decisions about supplements or medications. Drug interaction flags from any app are screening tools only — final clinical decisions require a pharmacist or doctor.
All brand and app names (StackSnap, SuppCo, InSup, Care/of, Prove It, AIBY, Bayer) are used nominatively to identify the products being compared. Loveiko Labs is not affiliated with, endorsed by, or sponsored by any competing app or company mentioned in this ranking.
