准音 vs 大提琴调音器（含专业节拍器）
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
准音
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一款为吉他手量身打造的专业调音工具，支持多种调弦模式，实时显示频率偏差，让每一弦都完美精准。 Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
大提琴调音器（含专业节拍器）
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该应用专门为大提琴调音开发，根据大提琴特点应用独特算法作调音修正，适用于各类大提琴的音弦音准校正，适配大提琴的所有调式。支持自定义标准音频率，同时包含节拍器功能，满足多种需求。应用简洁明了，即使是初学者，也很容易上手。
Screenshots
Verdict
The clearest difference is in-app purchases: 准音 at none against 大提琴调音器（含专业节拍器）'s 1. 大提琴调音器（含专业节拍器）'s advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.5). On price and ads 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. 大提琴调音器（含专业节拍器） sells 1 one-off in-app purchase. 准音 asks for nothing beyond the download.
In-app purchases
准音
No in-app purchases
大提琴调音器（含专业节拍器）
- 购买大提琴调音器$2.99
