The Showdown
SuperMemo (SM-18)vsfree-spaced-repetition-scheduler
Why pay monthly fees for SuperMemo (SM-18) when you can self-host free-spaced-repetition-scheduler for free? Let's look at the facts.
VS
SuperMemo (SM-18)
The Expensive Option
- Closed Source (Black box)
- Expensive monthly fees per user
- Data stored on their servers
WINNER
free-spaced-repetition-scheduler
The Freedom Choice
- 100% Open Source Code
- Free forever (Self-hosted)
- You own your data completely
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10 people
150100200+
$
*Estimated standard pricing for SuperMemo (SM-18). Adjust if needed.
Estimated Annual Waste
$1,440
Monthly Burn Rate$120
5-Year Projection$7,200
Cost with Self-Hosted$0
Calculations based on 10 users at $12/mo.
Detailed Breakdown
0
Proprietary SM-18
DSR (Difficulty, Stability, Retrievability)
1
Black-box logic
Fully auditable math
2
Single-platform lock-in
Multi-language libraries