# Smart Sudoku Zen vs 101 Circuits The clearest difference is update cadence: 101 Circuits at every 2 days against Smart Sudoku Zen's every 6 months. On price, ads, in-app purchases and device support there is nothing between them. Both are free to download. Neither carries in-app purchases, so what you see is what you pay. Smart Sudoku Zen ships an update every 6 months, 101 Circuits every 2 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively. ## The numbers | Metric | Smart Sudoku Zen | 101 Circuits | | --- | --- | --- | | Price | Free | Free | | In-app purchases | No | No | | Ads | No | No | | Update frequency | Every 6 months | **Every 2 days** | | Size | 27 MB | 32 MB | | Requires iOS | 18.6 | **17.0** | | Devices | iPhone, iPad | **iPhone, iPad, Mac** | | Age rating | 4+ | 4+ | | Developer | [Smart-Byte GmbH](https://appshunter.io/developer/1473446693) | [Chilling Moose](https://appshunter.io/developer/1595484986) | ## What reviewers say ### Smart Sudoku Zen [App page](https://appshunter.io/ios/app/smart-sudoku-zen/id6754931490) **Features:** macOS Compatibility, Vision Pro support **In-app purchases:** none ### 101 Circuits [App page](https://appshunter.io/ios/app/101-circuits/id6818058085) **Features:** Game Controller support, Vision Pro support **In-app purchases:** none ## Frequently asked questions ### Is Smart Sudoku Zen free? Smart Sudoku Zen is free to download, with no in-app purchases. ### Is 101 Circuits free? 101 Circuits is free to download, with no in-app purchases. ### Do Smart Sudoku Zen or 101 Circuits have ads? Neither Smart Sudoku Zen nor 101 Circuits shows ads. ### Which is updated more often, Smart Sudoku Zen or 101 Circuits? Smart Sudoku Zen ships an update every 6 months, and 101 Circuits every 2 days. Most recently, Smart Sudoku Zen was updated on November 5, 2026 and 101 Circuits on October 31, 2026. --- *Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*