Comparison

SiO Athletica vs Iron Diary

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

Head to head
About

SiO Athletica

Features
Read full description

Use your phone to book, cancel or enter the waiting list on a group session for your gym. Read news and get an overview of your membership directly from your phone. Mobile Access also gives you easy access to your gym. Have a good workout!

About

Iron Diary

Read full description

Iron Diary is a workout log built for lifters and runners who hate clutter. Track every set, every rep, every run — then watch your body actually change. STRENGTH TIER SYSTEM Every muscle gets a tier: Beginner, Novice, Intermediate, Advanced, Elite. Bench, squat, deadlift, OHP, row, plus 30+ other lifts including dumbbell variants. Calibrated against published strength standards. Tap any muscle to see your last PR, a 90-day score sparkline, weekly volume, time-to-next-tier estimate, and exercises you haven't tried yet. IRON DIARY WRAPPED A story-style monthly recap of your training — total volume, biggest PRs, muscles that leveled up, longest streak, and a tier card to share. Auto-prompts at the start of each month. Save and post to TikTok or Instagram. RUNNING + GPS Log runs with live GPS tracking — distance, pace, duration. Cardio lives alongside strength so your whole week is in one app. PROGRESSION Compare your starting body to today. See which muscles leveled up. Watch your strength score climb week by week. WORKOUT CONTAINERS Workouts are persistent — Push Day, Pull Day, Legs — not single dated sessions. Open one, log your sets, close it. The next time you do Push Day, your last weights and reps are right there. No clutter, no calendar gymnastics. EXTRAS • Recovery silhouette — see which muscles are still fatigued • 11 themes including pure black OLED • Rest timer with optional chime • Plate calculator • Body weight + measurement tracking • Warmup sets, supersets, drop sets • JSON export and import for full data portability • Norwegian and English number formats PRIVACY All your training data stays on your phone. No tracking, no ads. Local-first by design. Built solo by a lifter, for the gym floor.

Screenshots

SiO Athletica4 screens
Iron Diary4 screens

Verdict

The call

The clearest difference is update cadence: Iron Diary at every 6 days against SiO Athletica's every 2 weeks. Iron Diary also leads on iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

SiO Athletica ships an update every 2 weeks, Iron Diary every 6 days. The most recent releases landed on November 3, 2026 and October 25, 2026 respectively.

Scorecard2 real differences Ā· 4 level
SiO Athletica versus Iron Diary: the parameters behind the verdict, then further details
ParameterSiO AthleticaIron Diary
PriceFreeFree
Update frequencyEvery 2 weeksEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.015.1 — better
Further details — not scored
Size78 MB38 MB
Age rating4+4+
DeveloperStudentsamskipnaden i Oslo og AkershusEven Kofoed

In-app purchases

None

SiO Athletica

No in-app purchases

None

Iron Diary

No in-app purchases

Questions

Is SiO Athletica free?
SiO Athletica is free to download, with no in-app purchases.
Is Iron Diary free?
Iron Diary is free to download, with no in-app purchases.
Do SiO Athletica or Iron Diary have ads?
Neither SiO Athletica nor Iron Diary shows ads.
Which is updated more often, SiO Athletica or Iron Diary?
SiO Athletica ships an update every 2 weeks, and Iron Diary every 6 days. Most recently, SiO Athletica was updated on November 3, 2026 and Iron Diary on October 25, 2026.

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