Comparison

Structree vs Nubble Notes

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

Head to head
About

Structree

Features
Read full description

Structree is a simple app for organizing your thoughts into clear structures. Instead of keeping ideas as scattered notes, Structree helps you break them down into Worlds, Pyramids, Trees, and Nodes. Use it to organize projects, study topics, product ideas, personal plans, or any subject you want to understand more clearly. Create a World for a broad theme. Build Pyramids to shape your thinking. Use Trees to connect related ideas. Open Nodes to add detailed text and images. Structree is designed to stay simple. It focuses on structure, not complexity, so you can think clearly without being overwhelmed by too many features. Key features: - Organize ideas with Worlds, Pyramids, Trees, and Nodes - Add text blocks and images to Nodes - Search and reorder your structures - Keep your data on your device - Remove ads with an optional upgrade - Unlock larger limits with Pro Lifetime Structree is useful for: - Structured thinking - Idea organization - Study notes - Project planning - Product planning - Brainstorming - Personal knowledge organization If normal notes feel too flat, Structree gives your ideas a shape.

About

Nubble Notes

Organize your thoughts visually with interconnected bubbles. Nest notes and ideas, tag them with confidence levels, and link related concepts. This app allows for flexible organization that adapts to your thinking process.

Highlights
  • Visual bubble organization
  • Nested notes and bubbles
  • Multi-bubble note placement
  • Confidence tagging system
  • Linked idea connections
  • Password-protected private bubbles
  • Import and search functionality
Features
Read full description

Nubble organizes your thoughts in visual bubbles. Create notes, nest them inside your bubbles, tag them by how sure you are, and link related ideas — so your notes reflect how you actually think, not just when you wrote them down. Most notes apps ask you to decide on a structure before you have anything to put in it. Nubble lets the pile exist, then makes it something you can see and move around. Features: Visual bubble organization — bubbles hold notes and other bubbles, as deep as you like One note can live in several bubbles at once, no duplicates Drag and drop to rearrange, with pages that grow as you do Confidence tags: Certain, Think About More, Not Sure, Could Be Wrong — or make your own Link notes with typed connections and jump between them Lock private bubbles behind a password Search, sort, filter, and pin Import existing notes from text or by pasting Dark and light mode Free to use. Start as a guest with everything stored on your device, or sign in to sync across devices.

Screenshots

Structree4 screens
Nubble Notes4 screens

Verdict

The call

The clearest difference is in-app purchases: Nubble Notes at none against Structree's 2. Nubble Notes also leads on ads (none vs shown). Structree's advantage is iOS requirement (13.0 vs 16.0). On price, update cadence 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. Structree sells 2 one-off in-app purchases. Nubble Notes asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 5 days. The most recent releases landed on October 8, 2026 and October 11, 2026 respectively.

Scorecard3 real differences · 6 level
Structree versus Nubble Notes: the parameters behind the verdict, then further details
ParameterStructreeNubble Notes
PriceFreeFree
Rating—5.0 (2 ratings) — better
Number of ratings—2 — better
Update frequencyEvery 5 daysEvery 5 days
AdsYesNo — better
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better16.0
Further details — not scored
Size28 MB5 MB
Age rating4+4+
DeveloperYuichi SatoADAM JIANG LAI

In-app purchases

2 purchases

Structree

One-time2
  • Remove Ads$4.99
  • Pro Lifetime$14.99
None

Nubble Notes

No in-app purchases

Questions

Is Structree free?
Structree is free to download, with in-app purchases available.
Is Nubble Notes free?
Nubble Notes is free to download, with no in-app purchases.
Do Structree or Nubble Notes have ads?
Structree shows ads; Nubble Notes does not.
Which is updated more often, Structree or Nubble Notes?
Structree ships an update every 5 days, and Nubble Notes every 5 days. Most recently, Structree was updated on October 8, 2026 and Nubble Notes on October 11, 2026.

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