RPN vs 2Do
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RPN
Experience a faithful simulation of the groundbreaking HP-65 programmable calculator on your iPad. This app offers virtual program and data cards, a powerful card manager, and includes 170 original HP programs to get you started.
- Virtual program and data cards
- Virtual paper tape printer
- Database-driven card manager
- Create, delete, label, and organize cards
- Share via email, AirDrop, Dropbox, print
- Paste and run existing HP-65 listings
- Live display of stack and registers
- Four operational modes including 'Super-65'
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World's first pocket computer! Now running on your iPad. RPN-65 Pro is the first complete simulation of Hewlett-Packard's stunning HP-65 programmable calculator for iOS. Produced from 1974 to 1977 at an initial price of $795 (that's more close to $5,000 today!), the HP-65 was a breakthrough. Not only was it programmable, it also contained a motorized magnetic card reader - and still fit into Bill Hewlett's shirt pocket. Experience this revolutionary calculator on your iPad. With 170 original HP programs included with RPN-65 Pro, you can get started right away. "A work of art. Fantastic!" (MacBreak Weekly, episode 572) Features: • Virtual program and data cards • Virtual paper tape printer supports AirPrint • Powerful database-driven card manager • Create, delete, label, and organize a virtually unlimited number of cards • Sharing: e-mail, AirDrop, Dropbox, copy, paste, print • Paste existing HP-65 listings into RPN-65 and run them • "Live" display of stack, memory registers, program counter, flags • Reads data cards created by RPN-67 Pro and RPN-97 Pro • Supports external hardware keyboard Run RPN-65 Pro in any of 4 modes: 1 - Just like the original HP-65 2 - Same, but at high speed 3 - Includes user-interface improvements, like backstep key and jump to any program step 4 - "Super-65" with 999 program steps, 120 labels, 120 registers, nested subroutines, and much more For details, free program downloads, calculator handbook and much more, visit the RPN-65 website: cuveesoft.ch/rpn65
2Do
This task management app offers a fluid interface with deep features for organizing daily tasks and projects. It supports natural language input, quick capture methods, and flexible organization with lists, tags, and smart searches. Designed for iPad, it provides a desktop-grade experience with full keyboard and multitasking support.
- Natural language input for task creation
- Desktop-grade multitasking on iPad
- Quick capture via widgets and Siri
- Markdown notes with collected links
- Flexible repeat options and start dates
- Smart lists for saved searches
- Tagging system for context filtering
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GTD®, XYZ and everything in between - it can handle it all. Seriously. NOTE: Requires an active subscription. 2Do gives you a simple way to manage tasks, with the depth to organize every part of your life. Keep a few lists or build a complete GTD system. Create your own way of working, with no method imposed on you. AWARDS • Apple - Best of 2013 Mac App Store • MacStories - App of the Year 2015 iOS • Cult of Mac - Best Task Manager for iOS CAPTURE IT ALL • Type naturally. 2Do recognizes dates, times, repeats, alerts, durations, priorities, tags, lists and saved locations as you type. • Hold [+] for Quick Add and enter one task after another. • Capture with Siri, Shortcuts, widgets and Control Center. Turn shared text, links, photos or videos into tasks. • Email tasks to your private Mail to 2Do address, or send a numbered list to create a checklist. • Collect ideas in the GTD Inbox and organize them later. SIMPLE TASKS, CHECKLISTS & PROJECTS • Create tasks, checklists and projects with sub-tasks. Add notes, images, voice recordings and multiple alarms. • Write notes with live Markdown formatting and keep useful links with your tasks. • Set flexible repeats, start dates and durations. Call, email or open a link from a task. • Arrange tasks in named sections within a list. LIST GROUPS, LISTS & SMART LISTS • Organize your lists in groups, alongside built-in views for upcoming, starred and scheduled tasks. • Save searches as reusable Smart Lists. Search titles, notes, tags and dates, with sounds-like matching when needed. • Filter by date, priority, status or tags. Each list remembers its sort order and Focus settings. PROJECT VIEW • Open a project to see just that project and its sub-tasks. Set its sort order independently of the list around it. TAGS • Organize tags in groups and tap a tag to filter tasks. • Combine tags with Smart Lists for the tasks you return to often. Pause a tag to hide its tasks until you resume it. LOCATIONS • Create and assign locations, find nearby tasks on a map and build location-based Smart Lists. • Get a reminder when you arrive, with location access enabled. SYNC, YOUR WAY • Sync with Apple Reminders, Dropbox, Todoist, Toodledo, iCloud, Fastmail, Fruux, Yahoo or a CalDAV server you trust. • Keep tasks in Apple Reminders across your devices and capture them with Siri. • Merge work from different devices or exclude private lists from sync. COLLABORATE • Share lists and work together over local Wi-Fi without a cloud service. • Share read-only or editable lists over iCloud with others using compatible versions of 2Do. FIND AND FOCUS • Jump to any task or list with Quick Open. • Select several tasks to schedule, defer, tag, move or edit them together. ALARMS & YOUR DAY • Set multiple alarms, automatic reminders and repeating alerts. • Use full-screen alarms on supported devices with iOS or iPadOS 26.1 or later. • See calendar events and the day timeline above your tasks to plan around appointments. MADE FOR IPAD • Keep lists, tasks, the editor and utility panels in view. The editor follows your selection. • Open a second window and drag tasks between windows. Use Split View, Slide Over, keyboard shortcuts and the iPadOS menu bar. PASSWORDS & BACKUPS • Lock individual lists or the whole app. • Keep automatic backups, save and restore external backups, or restore a single list. Move backups between 2Do on iOS and Mac.
Verdict
The clearest difference is review sentiment: 2Do at 100% against RPN's 50%. 2Do also leads on rating (4.9 vs 4.0) and update cadence (daily vs every 3 months). RPN's advantage is price ($3.99 vs $19.99) and iOS requirement (12.0 vs 18.6). On ads, in-app purchases, monetization model and device support 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
RPN costs $3.99 and 2Do $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.
2Do holds the better App Store score, 4.9 against 4.0. Both are backed by a comparable volume of ratings — 4 and 18 respectively. Written reviews point the same way: 50% of RPN's written reviews are positive against 100% of 2Do's.
RPN ships an update every 3 months, 2Do daily. The most recent releases landed on October 20, 2026 and October 26, 2026 respectively.
| Parameter | RPN | 2Do |
|---|---|---|
| Price | $3.99 — better | $19.99 |
| Rating | 4.0 (4 ratings) | 4.9 (18 ratings) — better |
| Positive reviews | 50.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 4 | 18 — better |
| Update frequency | Every 3 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPad | iPad |
| Requires iOS | 12.0 — better | 18.6 |
| Further details — not scored | ||
| Size | 86 MB | 165 MB |
| Age rating | 4+ | 4+ |
| Developer | CuVee Software | Beehive Innovations Services |
Customer experience
RPN
2Do
In-app purchases
RPN
No in-app purchases
2Do
No in-app purchases









