Batch Resize vs Image Tuner

Batch Resize is an iOS and macOS app for changing multiple images to a chosen pixel size. Its current App Store listing says it can resize up to 500 images at once. Users can choose fixed width, fixed height, maximum pixel, aspect fill or aspect fit, then save results to Camera Roll or a custom album. Maximum output dimensions are 4000 × 4000 pixels on 32-bit devices and 8000 × 8000 pixels on 64-bit devices. The listing names English, Dutch, French, German, Italian, Japanese, Korean, Portuguese, Russian, Simplified Chinese and Spanish. Batch Resize is free to download and contains advertising; a 34.99 USD once in-app purchase removes ads. The developer indicates usage data may be used to track users and collected for third-party advertising and analytics, though Apple says this disclosure has not been verified by Apple.

Image Tuner has no write-up on Specifiction yet; its figures are above.