Base PRO vs OpenSpam
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Base conversions (2-20)
- Precision and clarity
- Visual Flow Function
- Interactive learning
- Full-screen mode
- Adjustable sizing
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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.
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.
- Instant call identification
- Customizable blocking levels
- Community reporting
- Built-in search for suspicious numbers
- Allowlist for trusted numbers
- Ad-free experience
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
| Parameter | Base PRO | OpenSpam |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.7 (3 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 50.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 12 — better | 17.6 |
| Further details — not scored | ||
| Size | 9 MB | 19 MB |
| Age rating | 4+ | 4+ |
| Developer | Nic Kolbe | Joaquin Garcia |
Customer experience
Base PRO
OpenSpam
In-app purchases
Base PRO
No in-app purchases
OpenSpam
No in-app purchases









