Comparison

Split Notes vs Duo

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

Head to head
About

Split Notes

A versatile text editor that allows for split-screen viewing in both vertical and horizontal orientations, along with tabbed interfaces. It offers automatic saving, folder management, and advanced search capabilities. Users can also synchronize scrolling between panes and export notes to CSV.

Highlights
  • Split-screen editing (vertical/horizontal)
  • Tabbed interface
  • Synchronized scrolling
  • Automatic saving
  • Folder management
  • Character and regex search
  • Export to CSV
Features
Read full description

This is a simple notepad which can switch between vertical and horizontal screen division, tab use screen. You can synchronize the scrolling of each text view by enabling the magnet button. Notes is saved automatically. Others - Folder management. - Character search, regular expression search. - Undo/Redo - Character count display. - Change font size. - Export to CSV file. - Backup/Restore with iCloud.

About

Duo

Features
Read full description

TwoUp puts two things on one iPhone screen at the same time: a web page, a PDF and a plain-text note, in any combination you need. Read a PDF above and write your notes below. Keep a reference page open beside the document you are working through. Both panes stay live — scroll one and the other keeps its place. SAVE THE PAIR A pair of panes is a workspace. Name it, and it reopens exactly as you left it: the same document, the same page, the same note text, the same divider position. MADE FOR READING Drag the divider to give either pane more room, or send one pane full screen and back. Turn the phone sideways and a PDF opens as a two-page spread, like a book, with your note still beside it. YOUR OWN SITES — WITH PRO Save the pages you keep coming back to, with their titles and icons, and open one into a pane without typing an address. IT ALL STAYS ON YOUR PHONE No account, no sign-in, and no server of ours. Your notes, your documents and your saved sites never leave the device — there is nowhere for them to go. The app asks for no permissions at all: no camera, no photos, no contacts, no location. The app sends anonymous usage statistics so we can see which screens people reach and where they get stuck. None of your content is ever included — not your notes, not the addresses you open. You can switch it off in Menu > App > Share usage data. TwoUp Pro adds two things: keeping more than one saved workspace, and saving your own sites as shortcuts. Terms of Use: https://nikolaykutsbr.github.io/twoup-support/terms.html Privacy Policy: https://nikolaykutsbr.github.io/twoup-support/privacy-policy.html

Screenshots

Split Notes4 screens
Duo4 screens

Verdict

The call

The clearest difference is ads: Duo at none against Split Notes's shown. Duo also leads on update cadence (every 2 days vs every 4 months). Split Notes's advantage is iOS requirement (16.0 vs 18.0). On price, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Split Notes sells 1 one-off in-app purchase and Duo sells 2 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Split Notes ships an update every 4 months, Duo every 2 days. The most recent releases landed on September 28, 2026 and September 30, 2026 respectively.

Scorecard3 real differences · 7 level
Split Notes versus Duo: the parameters behind the verdict, then further details
ParameterSplit NotesDuo
PriceFreeFree
Rating4.9 (11 ratings) — better—
Positive reviews83.3% of reviews—
Number of ratings11 — better—
Update frequencyEvery 4 monthsEvery 2 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad — betteriPhone
Requires iOS16.0 — better18.0
Further details — not scored
Size20 MB4 MB
Age rating4+17+
DeveloperKAZUTERU YOKOIMikalai Kuts

In-app purchases

1 purchases

Split Notes

One-time1
  • Remove ads$1.99
2 purchases

Duo

Subscriptions2
  • TwoUp Plus Week3 Days trial$6.997 Days
  • TwoUP Plus Year$59.991 Year

Questions

Is Split Notes free?
Split Notes is free to download, with in-app purchases available.
Is Duo free?
Duo is free to download, with in-app purchases available.
Do Split Notes or Duo have ads?
Split Notes shows ads; Duo does not.
Which is updated more often, Split Notes or Duo?
Split Notes ships an update every 4 months, and Duo every 2 days. Most recently, Split Notes was updated on September 28, 2026 and Duo on September 30, 2026.

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