Comparison

OnDose vs fillin

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

OnDose

Read full description

Know what you're taking. OnDose organises your supplements by timing and absorption, flags interactions from published research, and tracks what you take each day. Not medical advice. Just clarity. — SEE HOW THEY INTERACT Add a supplement and instantly see what competes, what combines well, and what to separate. Every interaction in your stack is checked against published research. Severity levels from Info to Avoid, each with a cited source. Zinc blocks iron. Calcium competes with magnesium. Your morning stack might be cancelling itself out. OnDose catches it. — GET YOUR TIMING RIGHT Supplements are grouped into timing windows based on absorption science. Iron on an empty stomach, magnesium in the evening, competing minerals separated by two hours. OnDose builds your daily schedule so you don't have to think about it. — DAILY CHECK-IN Your daily schedule shows what to take and when. Check off each supplement as you go, build a streak, and look back at any day to see exactly what you took. Push notifications at each timing window keep you on track. — SCAN. DON'T TYPE. Point your camera at a product's UPC barcode. OnDose checks against 37,000+ supplements from DSLD, Open Food Facts, and major brands. Name, dose, and ingredients fill in automatically. Not in the database? Photograph the Supplement Facts label. Ingredients, doses, and serving size are extracted automatically. — ORGANISE YOUR STACK Add supplements, set doses and timing, and keep your full routine in one place. — YOUR DATA, ALWAYS Export your full supplement history, check-ins, and stack configuration as JSON or CSV. No lock-in. If you leave, your data leaves with you. — WHAT'S INSIDE • 350+ supplement compounds covered • 100+ interactions checked with cited sources • 37,000+ barcodes indexed • Timing recommendations based on absorption science • Daily check-ins with streak tracking • Push notifications for each timing window • Barcode scanning and label photo OCR • Full data export (JSON/CSV) — ABOUT THE DATA Interaction data is sourced from NIH Office of Dietary Supplements, EFSA, and peer-reviewed journals. Every interaction cites at least one published source. Absence of data is shown as "no known interaction data available," never as "safe." This app is for educational purposes only. It is not medical advice and does not diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare professional before making changes to your supplement regimen. — SUBSCRIPTION OnDose requires a subscription to use. 3-day free trial, then auto-renews monthly. Cancel anytime. Terms: https://ondose.app/terms Privacy: https://ondose.app/privacy

About

fillin

Features
Read full description

Build a supplement routine you'll actually keep. Tell fillin what you want in plain language—"I want to sleep better and feel less stressed"—and get a stack of nutrients, products and daily check-ins for that goal. Then track it in one place, every day. WHY FILLIN Most people take supplements without knowing what they take, why, or whether it helps. fillin turns that into a routine you can see: what's in your stack, what you took today, and how you feel over time. BUILD A STACK FROM ONE SENTENCE Describe your goal. fillin proposes ingredients with doses, products that cover them, and the check-ins that matter for that goal—each with its sources. Review, adjust, and create your stack in seconds. MORE THAN ONE STACK Sleep, training, focus—keep a separate stack for each goal, with its own supplements and tracking. Today rolls them all into one daily view. TODAY, IN ONE VIEW Check off what you took. Log how you feel on a simple 1–5 scale. One progress ring shows where you stand across all your stacks. KNOW WHAT YOU HAVE Items keeps your products in two lists—already have and to buy—and adds up ingredients across your stacks so you don't double up. FIND AND COMPARE Search supplements by need or ingredient and compare products before you buy. Purchases happen outside the app. INSIGHTS As you track, fillin builds reports that connect your routine to how you feel—so you can see what's working and what isn't. APPLE WATCH (OPTIONAL) Wear an Apple Watch to sleep and fillin can read sleep and activity data from Apple Health to show passive trends on Today. Read-only, clearly labeled, and entirely optional. fillin is a wellness and organization tool. Its suggestions are general information, not medical advice. It does not diagnose or treat any condition—always consult a qualified professional about your health and any supplements you take.

Screenshots

fillin4 screens

Verdict

The call

The clearest difference is in-app purchases: fillin at none against OnDose's 1. OnDose's advantage is iOS requirement (15.1 vs 17.6). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. OnDose sells 1 in-app purchase, starting at $7.99 per month. fillin asks for nothing beyond the download.

Scorecard2 real differences · 4 level
OnDose versus fillin: the parameters behind the verdict, then further details
ParameterOnDosefillin
PriceFreeFree
Update frequency—Every 2 months
Ads—No
In-app purchasesYesNo — better
Devices—iPhone — better
Requires iOS15.1 — better17.6
Further details — not scored
Size43 MB10 MB
Age rating12+12+
DeveloperSidney OtteloheAimgonna Inc.

In-app purchases

1 purchases

OnDose

Subscriptions1
  • OnDose Monthly3 Days trial$7.991 Month
None

fillin

No in-app purchases

Questions

Is OnDose free?
OnDose is free to download, with in-app purchases available.
Is fillin free?
fillin is free to download, with no in-app purchases.

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