2026-08
🔄
Monetization changed: free → paid
→ 30 days after:
📊 Tracking summary
Tracked since
2014-04-08
Events detected
11
App Store rating
4.61★
Current revenue
$8.7K
/mo
📈 Reviews growth with event markers
Cumulative review count over time. Each marker (🚀⭐💲🔄🔧📈📊📦) is a detected event — click anything in the timeline below to scroll to its row.
📅 What Worked™ · full timeline (11 events)
Every detected change in Emergency Ultrasound Handbook since we started tracking. Each event shows the cause (what changed) and effect (measured impact over 30 days after). Confidence chip flags whether the attribution is clean or muddied by co-occurring events.
2026-08
💲
Went paid — introduced $4.99 price point
→ 30 days after:
2026-05
💲
Went free — dropped $4.99 price point
→ 30 days after:
2026-05
🔄
Monetization changed: paid → free
→ 30 days after:
2026-03
⭐
Rating ↑ 4.11 → 4.60 (improved 0.49★)
→ 30 days after:
2026-03
💲
Went paid — introduced $4.99 price point
→ 30 days after:
2026-03
📈
Crossed 10 ratings — social-proof flywheel kicking in
→ 30 days after:
2018-06
⭐
Rating ↑ 3.00 → 3.40 (improved 0.40★)
→ 30 days after:
revenue +$270/mo · rating +0.19★
medium confidence
2018-06
⭐
Rating ↑ 2.33 → 3.00 (improved 0.67★)
→ 30 days after:
revenue +$1.1K/mo · rating +1.53★
low confidence
2015-12
⭐
Rating ↑ 1.00 → 2.33 (improved 1.33★)
→ 30 days after:
2014-04
🚀
First tracked snapshot — initial data captured
→ 30 days after:
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