RPN-55 SD
RPN-55 SD generates an estimated $3–$50/month in revenue from 4–20 downloads/month on the App Store, according to AppCurrents estimates (updated 2026-08-02).
| Est. revenue / month | $3–$50 |
|---|---|
| Est. downloads / month | 4–20 |
| Estimate confidence | medium |
| Pricing | Paid $1.99 |
| Rating | 5.00 ★ (8 ratings) |
| Category | Productivity |
| Best chart rank | #87 Productivity Paid |
| Released | 03.07.2019 |
| App last updated | 17.10.2025 |
| Platform | iOS |
Modeled monthly estimate · rating velocity · medium confidence
About
RPN-55 SD is the first photo-realistic simulation for the iPhone of Hewlett-Packard's low-cost alternative to the famous HP-65 programmable scientific calculator. Produced from 1975 through 1977, it was the "Merlin" member of the classic HP calculator series, priced at $395. HP claimed that it featured "(...) more pre-programmed functions than any other scientific pocket calculator in the world."…
Trends & analysis
Chart rank trend
US · categoryWhy it's surfacing
Scout 13Ratings & velocity
★ 0 in windowRating distribution
100% positive · 8 ratingsGeographic reach
best rank · 2 storefrontsRevenue & downloads trend
ARPU $1Update history
1 update tracked- v3.39mo ago
• Improved compatibility with iPhone Air and iOS 26.
RPN-55 SD — FAQ
How much money does RPN-55 SD make?
According to AppCurrents estimates, RPN-55 SD generates approximately $3–$50 per month (medium confidence), modeled from its the App Store chart performance, rating velocity, and monetization signals.
How many downloads does RPN-55 SD get?
RPN-55 SD sees an estimated 4–20 downloads per month on the App Store, per AppCurrents modeling.
Is RPN-55 SD free?
RPN-55 SD is a paid app priced at $1.99 on the App Store.
What is RPN-55 SD's rating?
RPN-55 SD holds a 5.00-star average from 8 ratings on the App Store. It currently ranks #87 on the Productivity paid chart.
When was RPN-55 SD released?
RPN-55 SD launched on the App Store on 03.07.2019. Its latest version shipped 17.10.2025.
