OneCal is a science-based calorie tracker for people who don’t want to think about weight loss—they just want to do it. No macros to calculate, no barcode scanning, no friend feeds, no badges. Enter the calories that you eat, see your target, and move on. It’s calories in, calories out—fast to log, simple to follow—so you can spend less time in an app and more time living your life. This app provides general information only and is not medical advice. Consult a qualified healthcare professional before making changes to your diet or exercise. OneCal does not diagnose, treat, cure, or prevent any condition and disclaims liability for decisions made based on app data.

Screenshots

Shift3 screens

OneCal Calorie Tracker3 screens

Verdict

The call

The clearest difference is ads: Shift at none against OneCal Calorie Tracker's shown. OneCal Calorie Tracker's advantage is update cadence (every 9 days vs every 7 months). On price, in-app purchases, device support and iOS requirement 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Shift ships an update every 7 months, OneCal Calorie Tracker every 9 days. The most recent releases landed on October 1, 2026 and October 3, 2026 respectively.

Scorecard2 real differences · 4 level

Shift versus OneCal Calorie Tracker: the parameters behind the verdict, then further details
Parameter	Shift	OneCal Calorie Tracker
Price	Free	Free
Update frequency	Every 7 months	Every 9 days — better
Ads	No — better	Yes
In-app purchases	No	No
Devices	iPhone	iPhone, iPad — better
Requires iOS	17.6 — better	18.6
Further details — not scored
Size	3 MB	5 MB
Age rating	4+	4+
Developer	Kip Builds LLC	Marcus Spitzmiller

In-app purchases

None

Shift

No in-app purchases

None

OneCal Calorie Tracker

No in-app purchases

Questions

Is Shift free?

Shift is free to download, with no in-app purchases.

Is OneCal Calorie Tracker free?

OneCal Calorie Tracker is free to download, with no in-app purchases.

Do Shift or OneCal Calorie Tracker have ads?

OneCal Calorie Tracker shows ads; Shift does not.

Which is updated more often, Shift or OneCal Calorie Tracker?

Shift ships an update every 7 months, and OneCal Calorie Tracker every 9 days. Most recently, Shift was updated on October 1, 2026 and OneCal Calorie Tracker on October 3, 2026.