KPlayerAir vs Build SRT
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KPlayerAir
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KPlayerAir (Free) is a video playback app. It can play video files (common MPEG-4 video in LOCAL mode) with subtitles (SMI/SRT). • Requires iOS 13.0 or later. - (LOCAL mode) To add video/subtitle files or folders to the app, use the 'Finder'(Mac), the 'Apple Devices' app(PC), or 'iTunes'(Old OS). ; 'Finder', 'Apple Devices' app > Select a device in the sidebar > 'Files' > 'KPlayerAir' ; 'iTunes' > Select a device > 'Apps' > 'File Sharing' > 'KPlayerAir' - Sub-folders of these added folders are ignored. • Subtitles - It supports Ruby tag, Integrated, Text encoding. - Subtitles (SMI/SRT) are displayed in real time even if it searches the playback position through the time slider, gestures or 'Skip'. - If the video (file_name) is opened, it searches the subtitles (file_name or file_name*) at the same folder. ; 'file_name.smi', 'file_name*.smi', 'file_name.srt', 'file_name*.srt' - (LOCAL mode) Closed Caption (embedded tx3g) style/behavior follows the OS settings. ; 'Settings' > 'Accessibility' > 'Subtitles & Captioning' ; CC are always displayed at the bottom of the screen. Their timing can’t be adjusted. Also, even if there are two or more CC items, it can select only one of them. • Playable Types - (LOCAL mode) common MPEG-4 video ; MP4/M4V/MOV, H.264/HEVC, AAC/ALAC/AC3, YUV420P(8bit/10bit)/YUV444P(10bit/12bit) ; If the video/audio track was encoded in the settings that are not supported by the OS or device, it may not be able to play. For example, 'YUV420P 10bit', 'YUV444P 10bit/12bit' pixel formats. ; In the case of HEVC codec, the codec tag must be 'hvc1' to be playable. - It doesn't support the playback of a protected video file. More detailed information is available in "App Support". (https://bohoonkim.blogspot.com/2016/08/kplayerair.html) ※ The 'KServer mode' feature has been temporarily disabled. We will later renew it to support a new version of 'KServer'. ※ We have added a button to watch advertisements for those who want to contribute to continuous app development. And this button feature uses third-party SDK, 'AdMob', 'Google Mobile Ads SDK' that may collect certain information.
Build SRT
This utility converts spoken audio from videos into standard SRT subtitle files. It supports importing videos from your device and offers efficient sound extraction for subtitle generation. The generated SRT files are universally compatible and easily shareable.
- Speech-to-text transcription
- Import videos from Photos and Files
- Extract audio for SRT generation
- Universal SRT file format
- Share SRT files easily
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Build SRT leverages Apple’s built-in speech recognition framework to convert spoken audio into text. You can use the system’s native speech-to-text functionality to experience its transcription accuracy firsthand. To complement the limitations of the built-in recognizer, the app also supports manual import of natural language text, offering greater flexibility in subtitle creation. The app generates subtitle files in standard SRT format, but it does not produce new video files with embedded subtitles. The "Build SRT" App can efficiently extract the voice in the video and convert these sounds into subtitle SRT files. The generated subtitle SRT file is a universal subtitle file format, so that you can use the subtitle SRT file widely. Features: • It is very convenient to import videos from the system "Photos" and "Files" • Import videos at the same time and view subtitles according to the video at a glance • Efficiently and quickly extract the sound in the video and convert it into an SRT file • SRT files can be quickly shared on other devices.Support sharing, copying, spacing and forwarding on Apple system to facilitate exporting SRT files for modification and use. • SRT files are a universal subtitle file format and can be used widely. Support: If you have any suggestions and comments, please do not hesitate to contact the developer: Email: hanmingjie@gmail.com WeChat: MingJie-Han
Screenshots
Verdict
The clearest difference is price: KPlayerAir at Free against Build SRT's $2.99. KPlayerAir also leads on iOS requirement (13.0 vs 17.6). Build SRT's advantage is ads (none vs shown). On update cadence, in-app purchases and device support 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
KPlayerAir is free to download; Build SRT costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
KPlayerAir ships an update monthly, Build SRT every 5 weeks. The most recent releases landed on September 12, 2026 and August 14, 2026 respectively.
| Parameter | KPlayerAir | Build SRT |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Monthly — better | Every 5 weeks |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 13.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 5 MB | 25 MB |
| Age rating | 9+ | 4+ |
| Developer | BoHoon Kim | 韩 明洁 |
In-app purchases
KPlayerAir
No in-app purchases
Build SRT
No in-app purchases









