Comparison

Base PRO vs OpenSpam

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

Head to head
About

Base PRO

This app simplifies base conversions from Base 2 to Base 20 with precision and clarity. It offers interactive visual explanations of number systems, making it ideal for students and educators learning computer science and digital computation.

Highlights
  • Base conversions (2-20)
  • Precision and clarity
  • Visual Flow Function
  • Interactive learning
  • Full-screen mode
  • Adjustable sizing
Features
Read full description

Master base conversions effortlessly and deepen your understanding of computer science. Simplify complex calculations with this comprehensive base calculator — from Base 2 to Base 20 — designed for precision, clarity, and speed. Ideal for students, teachers, and anyone exploring the logic of number systems or digital computation. As an educator, I’ve used Base PRO on a large screen to demonstrate base concepts interactively. Students immediately grasped how each system connects, accelerating their comprehension of mathematical and computational relationships. Perfect for classrooms and study sessions alike, Base PRO supports full-screen mode and adjustable sizing in macOS , and a unique Flow Function that visually explains the logic behind base conversions — making learning both intuitive and engaging.

About

OpenSpam

This app identifies and blocks unwanted calls using a community-powered database and a risk score algorithm. It offers customizable blocking levels and ensures user privacy by not collecting personal data or accessing contacts for commercial purposes.

Highlights
  • Instant call identification
  • Customizable blocking levels
  • Community reporting
  • Built-in search for suspicious numbers
  • Allowlist for trusted numbers
  • Ad-free experience
Read full description

Reclaim your peace of mind with the official OpenSpam.es app. OpenSpam is the ultimate solution to identify and block unwanted calls. Born from the collective frustration with telephone harassment, we have created a 100% free, transparent, and ethical tool. No ads, no hidden purchases, and most importantly, no selling your data. TOTAL TRANSPARENCY AND PRIVACY Unlike other apps, OpenSpam doesn’t need to know who you are or access your contacts for commercial purposes. Guaranteed Privacy: We do not collect personal data. Your reports are anonymous. Ad-free: A clean interface, designed solely to protect you. Proprietary Database: We do not rely on third parties. We use the public and documented OpenSpam.es API, powered by an active community. INTELLIGENT AND SECURE PROTECTION Our reputation algorithm analyzes reports and search trends to assign a "Risk Score" to every unknown number. Blocking Levels: You are in control. Choose between Mild, Balanced, or Aggressive protection according to your needs. Safety for your Contacts: OpenSpam is safe. We will never block a number saved in your contacts or one you have recently interacted with; we will simply alert you if it has negative reports. Silent Updates: The database updates automatically in the background. We will only send notifications if it is truly important. No disturbances. KEY FEATURES: Instant Identification: Know who is calling before you pick up. Detect Spam, Fraud, or aggressive Telemarketing. Built-in Search: Got a suspicious missed call? Check it in the app before calling back. Community Reporting: Help others by reporting toxic numbers. When one person reports, we all benefit. Allowlist: Easily manage your exceptions and trusted numbers. JOIN THE RESISTANCE AGAINST SPAM OpenSpam is a project created by users, for users. We believe peace of mind shouldn't come with a price tag or cost you your privacy. Download OpenSpam today and say goodbye to interruptions. Free. Secure. For everyone.

Screenshots

Base PRO2 screens
OpenSpam4 screens

Verdict

The call

The clearest difference is review sentiment: Base PRO at 100% against OpenSpam's 50%. Base PRO also leads on device support (4 vs 1) and iOS requirement (12 vs 17.6). OpenSpam's advantage is update cadence (every 3 weeks vs every 4 months). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Base PRO ships an update every 4 months, OpenSpam every 3 weeks. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.

Scorecard4 real differences · 6 level
Base PRO versus OpenSpam: the parameters behind the verdict, then further details
ParameterBase PROOpenSpam
PriceFreeFree
Rating—3.7 (3 ratings) — better
Positive reviews100.0% of reviews — better50.0% of reviews
Number of ratings—3 — better
Update frequencyEvery 4 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPod, Mac — betteriPhone
Requires iOS12 — better17.6
Further details — not scored
Size9 MB19 MB
Age rating4+4+
DeveloperNic KolbeJoaquin Garcia

Customer experience

Base PRO

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

OpenSpam

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews2 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

In-app purchases

None

Base PRO

No in-app purchases

None

OpenSpam

No in-app purchases

Questions

Is Base PRO free?
Base PRO is free to download, with no in-app purchases.
Is OpenSpam free?
OpenSpam is free to download, with no in-app purchases.
Do Base PRO or OpenSpam have ads?
Neither Base PRO nor OpenSpam shows ads.
Which is updated more often, Base PRO or OpenSpam?
Base PRO ships an update every 4 months, and OpenSpam every 3 weeks. Most recently, Base PRO was updated on October 6, 2026 and OpenSpam on October 10, 2026.

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