Comparison

One Academy® vs Decem

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

Head to head
About

One Academy®

Features
Read full description

One Academy is an award-winning group fitness facility, designed with the HiFLUX® training methodology. Our functional strength and conditioning classes will help you push your limits and get stronger each week, with the support of an unmatched community. Download the app to book classes, personal training, and wellness appointments, and unlock access to exclusive deals. It doesn’t get easier, you get stronger!

About

Decem

This app helps personal trainers track client session packs, manage bookings, and record payments. It offers quick session check-offs via widgets and calendar syncing, with an optional Pro version for advanced earnings insights.

Highlights
  • Client session pack tracking
  • Quick session check-off widget
  • Automated booking and calendar sync
  • Payment and package management
  • Client history and running balance
  • Earnings insights (Pro version)
Read full description

Decem keeps the one number every personal trainer carries in their head: how many sessions each client has left. Add a client. Sell them a pack. Book them. Check the session off when it happens, and the count drops by one. That's the whole idea, and everything else in Decem exists to make that faster. CHECK OFF WITHOUT OPENING THE APP A home screen widget shows who's up today. Tap the circle and the session is done and counted. At the end of the day Decem sends one notification, "3 sessions today. All done?", and one press checks everyone off. That's the only notification it sends unless you ask for more. BOOK ONCE, NOT EVERY WEEK Book a client weekly for a number of weeks, or weekly until their pack runs out. Any session can be repeated at the same time next week in one tap. Two clients in one slot? Book them together and each uses a session from their own pack. KNOW BEFORE THEY RUN OUT Every client shows their count at a glance. Decem warns you at two left, and when you check off someone's last session it offers to sell the next pack right there. Sell a new pack while the old one still has sessions and they simply stack. YOUR CALENDAR, BOTH WAYS Every booking lands in Apple Calendar or Google Calendar. Move it there and Decem follows. Delete it there and the session is cancelled. Type a client's name into the Decem calendar and it becomes a booking. Conflicts with the rest of your life show up before you double book. ONE TAP CONFIRMATIONS After booking, Decem drafts a text to the client with the details and a calendar invite attached. You tap Send. The wording is yours to change. HONEST COUNTING Booking a session never touches the count. Only checking it off does. No shows and late cancellations follow your policy, and the answer is locked onto that session so changing your policy later never rewrites history. Every client's history shows a running balance, so you can see exactly where each session went. Moving over from paper? Enter the purchase date and what's already been used, and Decem picks up from there. PAYMENTS AND PACKAGES Set up what you sell: a single session, a 5 pack, a 10 pack, whatever your price list looks like. Record payments against each pack and see who owes what. KNOW WHAT YOU REALLY EARN (DECEM PRO) Insights turns your own data into the numbers a trainer never has: what you actually earn per session delivered, how much bulk discount you've given, what's owed to you, how many paid sessions are still on the books, your busiest days and hours, your top clients by value, and who's going quiet with sessions left. No tax jargon, no spreadsheets. YOURS, ON YOUR PHONE Your clients live on your iPhone and in your own iCloud. No Decem account, no Decem server, nothing to leak. Export everything to CSV any time, or delete everything in one tap. Free for your first three clients, forever, with every feature. Decem Pro unlocks unlimited clients and Insights, monthly, yearly, or once for life. Nothing is ever taken away: if Pro lapses, your clients stay right where they are. Built by a trainer, for trainers who count. Privacy Policy: https://decemapp.com/privacy Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

One Academy®3 screens
Decem4 screens

Verdict

The call

The clearest difference is in-app purchases: One Academy® at none against Decem's 3. Decem's advantage is update cadence (every 2 weeks vs monthly). On price, ads, 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. Decem sells 3 in-app purchases, starting at $7.99 per month. One Academy® asks for nothing beyond the download.

UpkeepUpdate frequency

One Academy® ships an update monthly, Decem every 2 weeks. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 8 level
One Academy® versus Decem: the parameters behind the verdict, then further details
ParameterOne Academy®Decem
PriceFreeFree
Rating—5.0 (1 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—1 — better
Update frequencyMonthlyEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPad — betteriPhone
Requires iOS16.0 — better17.6
Further details — not scored
Size195 MB2 MB
Age rating4+4+
DeveloperOne Transformation Academy LtdVICTOR MATTHEW IVANESCU

In-app purchases

None

One Academy®

No in-app purchases

3 purchases

Decem

Subscriptions2
  • Decem Pro Monthly$7.991 Month
  • Decem Pro Yearly$59.991 Year
One-time1
  • Decem Pro Lifetime$149.99

Questions

Is One Academy® free?
One Academy® is free to download, with no in-app purchases.
Is Decem free?
Decem is free to download, with in-app purchases available.
Do One Academy® or Decem have ads?
Neither One Academy® nor Decem shows ads.
Which is updated more often, One Academy® or Decem?
One Academy® ships an update monthly, and Decem every 2 weeks. Most recently, One Academy® was updated on October 25, 2026 and Decem on October 31, 2026.

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