Comparison

HP vs TimecodeRPN

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

Head to head

RPN Calculator. HP-35, 45, 21

Free

🔧 Utilities

★ 5.05 ratingsView app →

TimecodeRPN

RPN Timecode Calculator

$0.99

🔧 Utilities

No ratingsView app →

About

HP

Emulates classic Hewlett Packard RPN scientific calculators from the 1970s. Experience the original HP-35, HP-45, and HP-21 models on your iPhone.

Highlights

RPN calculator emulation
HP-35 model
HP-45 model
HP-21 model
Classic scientific calculator interface

Features

Read full description

The classic Hewlett Packard RPN (Reverse Polish Notation) calculators. - HP-35, HP-45. First pocket scientific calculators (1972). - HP-21. 2nd gen of the HP-35 (1975)

About

TimecodeRPN

Read full description

This is a RPN timecode calculator styled after the HP calculators of old.

Screenshots

HP4 screens

TimecodeRPN4 screens

Verdict

The call

The clearest difference is price: HP at Free against TimecodeRPN's $0.99. TimecodeRPN's advantage is update cadence (every 2 days vs every 11 days). On ads, in-app purchases, 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

HP is free to download; TimecodeRPN costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

HP ships an update every 11 days, TimecodeRPN every 2 days. The most recent releases landed on October 8, 2026 and September 13, 2026 respectively.

Scorecard2 real differences · 8 level

HP versus TimecodeRPN: the parameters behind the verdict, then further details
Parameter	HP	TimecodeRPN
Price	Free — better	$0.99
Rating	5.0 (5 ratings) — better	—
Positive reviews	100.0% of reviews	—
Number of ratings	5 — better	—
Update frequency	Every 11 days	Every 2 days — better
Ads	No	No
In-app purchases	No	No
Monetization	Free	—
Devices	iPhone	iPhone
Requires iOS	17.2 — better	17.6
Further details — not scored
Size	2 MB	19 MB
Age rating	4+	4+
Developer	Enrique Haro	Denis Leconte

In-app purchases

None

HP

No in-app purchases

None

TimecodeRPN

No in-app purchases

Questions

Is HP free?

HP is free to download, with no in-app purchases.

Is TimecodeRPN free?

TimecodeRPN costs $0.99, with no in-app purchases.

Do HP or TimecodeRPN have ads?

Neither HP nor TimecodeRPN shows ads.

Which is updated more often, HP or TimecodeRPN?

HP ships an update every 11 days, and TimecodeRPN every 2 days. Most recently, HP was updated on October 8, 2026 and TimecodeRPN on September 13, 2026.