WidgetCal vs NumLens by OpenSquare
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WidgetCal
Perform calculations directly from your home screen with advanced functions. Customize your experience with multiple themes. Unlock premium features through a subscription.
- Home screen widget calculator
- Trigonometric and calculus functions
- Over 10 beautiful themes
- No ads
- Monthly/annual subscription for Pro features
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WidgetCal - Widget calculator allows you to calculate on your home screen - Supports trigonometric functions, logarithms, square root, square, reciprocal, π, and calculus tools for derivative at x and definite integral over [a, b] - Home Screen Widget Calculator (iOS 17 Interactive Widgets) - Over 10+ beautiful themes - No Ads ----- WidgetCal Pro is available with a monthly or annual subscription. You can subscribe and pay through your Apple account. Your subscription will automatically renew unless canceled at least 24 hours before the end of the current period. Auto-renew may be turned off after purchase. Terms of Use: https://www.zhihuke.com/widgetcal/terms.html Privacy Policy: https://www.zhihuke.com/widgetcal/privacy.html
NumLens by OpenSquare
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Without saving a phone number in your Contacts, NumLens will help you contact that number on messaging apps (WhatsApp, Telegram, Viber, Signal, etc.). Save scanned numbers in Contacts, make phone call, send SMS, share them anywhere, copy numbers, and more interesting features. You can use NumLens anywhere to quickly extract phone numbers: ‣ Restaurant menu: Scan numbers, start phone call to request an order. ‣ Supermarket: Scan printed payment number, copy it to pay your bill. ‣ Hospital / Clinic: Scan communication number, send required documents on WhatsApp. ‣ Unsaved contact / Business card: Share contact to NumLens, and enjoy all its features. ‣ Image / Screenshot: Share image to NumLens to extract phone numbers in it. ‣ Pharmacies, Shops, etc: Scan phone numbers, add them to Contacts to contact them later. ⌘ FEATURES ⌘ ▪ Scan phone numbers using camera ▪ Enter phone number manually ▪ Send WhatApp/Telegram/Viber/Signal messages without saving to Contacts ▪ Start phone call ▪ Add extracted numbers to Contacts ▪ Send SMS messages ▪ Share or Copy extracted phone numbers ▪ Simple & Clean design NumLens makes contacting people fast, accurate, and effortless, saving you time and keeping your Contacts clean.
Screenshots
Verdict
The clearest difference is in-app purchases: NumLens by OpenSquare at none against WidgetCal's 2. NumLens by OpenSquare also leads on update cadence (every 3 days vs every 32 months). 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
Both are free to download. WidgetCal sells 2 in-app purchases, starting at $0.99 per month. NumLens by OpenSquare asks for nothing beyond the download.
WidgetCal ships an update every 32 months, NumLens by OpenSquare every 3 days. The most recent releases landed on October 13, 2026 and October 31, 2026 respectively.
| Parameter | WidgetCal | NumLens by OpenSquare |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 32 months | Every 3 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 3 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | 杏娣 吴 | Ahmed Abdelkarim |
In-app purchases
WidgetCal
- WidgetCal Pro$0.991 Month
- WidgetCal Pro7 Days trial$3.991 Year
NumLens by OpenSquare
No in-app purchases
Questions
Is WidgetCal free?
Is NumLens by OpenSquare free?
Do WidgetCal or NumLens by OpenSquare have ads?
Which is updated more often, WidgetCal or NumLens by OpenSquare?
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