Comparison

1000digit Calc vs Thoughtree

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

Head to head
About

1000digit Calc

Perform arithmetic operations on integers up to 1,000 digits. Supports parentheses for complex calculations and automatically saves results to the clipboard for easy reuse in other applications.

Highlights
  • 1,000-digit integer calculations
  • Parentheses support for formula order
  • Automatic clipboard saving of results
  • Four basic arithmetic operations
  • Cross-application result reuse
Features
Read full description

This is a calculator that can perform four arithmetic operations on integers up to about 1,000 digits. You can use parentheses in formulas, so you can calculate in the same order as in the formula. Calculation results are saved to the clipboard each time, so they can be reused in other applications.

About

Thoughtree

Read full description

A mind map for brainstorming, planning, and organizing your thoughts on Mac, iPhone, and iPad. It opens your .itmz files as they are. Thoughtree is built in Swift for Apple devices. Get your thoughts out, shape them into branches, and pick up the same map on any device. CAPTURE Add child and sibling topics in a keystroke and keep typing. Start a title with an emoji and it becomes the topic's icon. ORGANIZE Drag branches into place, reorder in the outline, and collapse a whole map to a display level (1–9). Add Markdown notes, relationship lines, boundaries, callouts, images, and tasks. BRING YOUR MAPS WITH YOU Open your .itmz files and keep working on them, topics, notes, and images included. Also imports OPML, Markdown, FreeMind, XMind, CSV, plain text, and browser bookmarks. ANY DEVICE Maps sync through your own iCloud Drive across Mac, iPhone, and iPad. No account, no sign-in. SHARE Export PNG, PDF, and plain text, or print (with a small watermark in Lite). FREE IN THOUGHTREE LITE Unlimited maps, all editing, iCloud sync, every import format, the built-in library of 313 images, two themes (Sapling and Aurora), and the "Create Mind Map" and "Open Mind Map" shortcuts. MORE WITH THOUGHTREE PRO - All 12 themes - Search across every map, plus Spotlight and the "Search Mind Maps" shortcut - Watermark-free PNG / PDF export and printing, plus Markdown and OPML export - Quick Entry: paste an outline and expand it into branches in one step - Edit task attributes and conditional formatting - Home Screen widgets for your recent maps (iPhone and iPad) PURCHASING Choose a one-time Lifetime purchase or an auto-renewing yearly plan. There's no monthly plan. One purchase works on every iPhone, iPad, and Mac signed in with the same Apple ID. The yearly plan renews automatically unless canceled at least 24 hours before the end of the current period, and payment is charged to your Apple ID. Manage or cancel it in your App Store account settings. REQUIREMENTS - Mac: macOS 13 or later - iPhone / iPad: iOS 16 or later Terms of Use: https://thoughtree.nijizo.dev/terms-of-service Privacy Policy: https://thoughtree.nijizo.dev/privacy-policy

Screenshots

1000digit Calc2 screens
Thoughtree4 screens

Verdict

The call

The clearest difference is in-app purchases: 1000digit Calc at none against Thoughtree's 2. Thoughtree's advantage is update cadence (every 3 days vs weekly). On price, ads, 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

Both are free to download. Thoughtree sells 2 in-app purchases, starting at $19.99 per year. 1000digit Calc asks for nothing beyond the download.

UpkeepUpdate frequency

1000digit Calc ships an update weekly, Thoughtree every 3 days. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

Scorecard2 real differences · 7 level
1000digit Calc versus Thoughtree: the parameters behind the verdict, then further details
Parameter1000digit CalcThoughtree
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyWeeklyEvery 3 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.0 — better16.0
Further details — not scored
Size5 MB66 MB
Age rating4+4+
DeveloperYukihiro ShioyaNIJIZO

In-app purchases

None

1000digit Calc

No in-app purchases

2 purchases

Thoughtree

Subscriptions1
  • Pro Yearly$19.991 Year
One-time1
  • Thoughtree Pro (Lifetime)$29.99

Questions

Is 1000digit Calc free?
1000digit Calc is free to download, with no in-app purchases.
Is Thoughtree free?
Thoughtree is free to download, with in-app purchases available.
Do 1000digit Calc or Thoughtree have ads?
Neither 1000digit Calc nor Thoughtree shows ads.
Which is updated more often, 1000digit Calc or Thoughtree?
1000digit Calc ships an update weekly, and Thoughtree every 3 days. Most recently, 1000digit Calc was updated on October 30, 2026 and Thoughtree on October 25, 2026.

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