VHDL Compiler vs SubLater
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
VHDL Compiler
Write and test VHDL code on your mobile device. This application is designed for learning and executing VHDL snippets using the GHDL simulator. It offers a code editor with syntax highlighting and a custom keyboard for efficient input.
- Compile and run VHDL programs
- View program output and errors
- Custom keyboard for VHDL characters
- Advanced source code editor
- Syntax highlighting and line numbers
- Import, open, save, and share files
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Write VHDL code directly on your iPhone, iPad and iPod Touch! This app is ideal for learning and testing code snippets! VHDL (VHSIC Hardware Description Language) is a hardware description language used in electronic design automation to describe digital and mixed-signal systems such as field-programmable gate arrays and integrated circuits. VHDL can also be used as a general purpose parallel programming language. This app uses the open-source GHDL simulator (http://ghdl.free.fr). GHDL is a VHDL compiler that can execute (nearly) any VHDL program. GHDL is not a synthesis tool: you cannot create a netlist with GHDL (yet). Features: - Compile and run your program - View program output or detailed error - Custom keyboard for easy input of frequently used characters - Optimized for connecting with external physical/bluetooth keyboard - Advanced source code editor with syntax highlighting and line numbers - Open, save, import and share VHDL files. Limitations: - Internet connection is required for compilation - Maximum program running time is 20s - One file can be run at a time - All entities should be have the same name as their files.
SubLater
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When the subtitle appears with the sound, your eyes read it first and your ears never get a turn. SubLater shows subtitles in Safari only after you've had a chance to listen. The sound goes by, then the line arrives. [How to use] · Settings → Apps → Safari → Extensions: turn on SubLater and set every site you use to Allow (SubLater won't run on a site left on Ask). If Safari shows a banner saying SubLater needs more permissions, open it and choose Always Allow… (Allow for One Day stops again the next day). If asked next, all websites is fine — it allows just the sites SubLater uses, in one go; it can't reach any other site. · Open YouTube by typing youtube.com into Safari's address bar (or use "Open YouTube in Safari" in the SubLater app). Tapping a YouTube link in another app or in search results opens the YouTube app, where SubLater can't run. · Press play. The subtitle arrives a beat late. That's it. · Tap a word in the subtitle for its meaning. Tap the small dot at the right edge of the video to open the controls. [Which languages?] SubLater is built first for Korean speakers learning English. · Any subtitle language: subtitle delay (adjustable in Pro), Reveal mode (Pro), jump / replay / loop, auto-pause. · English subtitles: word meanings, linking marks and the Pro sound line are written in Korean (Hangul). · Korean subtitles: tap a Korean word for its English meaning and how it actually sounds, with romanization. · Dictation scoring: English and Korean only. [What it does] · Subtitle delay — listen first, confirm with the text · Dual subtitles — the translation appears under the original (when the site carries both) · Jump, replay, loop — stay on one line until you hear it · Auto-pause — stops after each line so you can say it back · Dictation — type what you heard and get it scored on the spot · Word meanings — tap an English word for its Korean meaning, or a Korean word for its English meaning · Linking marks — shows where two words blend into a sound you didn't expect [Where it works] · iPhone: YouTube — turn on Settings → Apps → Safari → Request Desktop Website → All Websites (it does not run on YouTube's mobile layout) · iPad · Mac: YouTube · Netflix · Viki · Coupang Play · Disney+ (Mac only) Netflix does not play in the iPhone browser (Netflix's policy). It works in Safari on iPad and Mac. [What we don't do] · No account, no sign-in. · Nothing you watch, read or type leaves your device. · No ads. SubLater is an independent product, not affiliated with Netflix, YouTube, Disney+, Viki or Coupang Play. Each service needs its own account. [Free and Pro] · Everything in Pro is open for 14 days after install. The app doesn't lock when the trial ends. · Free after the trial: subtitle delay (2.0 s, on or off), dual subtitles, jump / replay / loop, auto-pause, word meanings, linking marks (dictation 10 lines a day, up to 50 saved lines) · Pro: adjustable delay (0–5 s), Reveal mode, the sound line, unlimited dictation, 5,000 saved lines, phrasal-verb & idiom notes, ladder replay [Subscription] SubLater Pro is an auto-renewing subscription, monthly or yearly. · Payment is charged to your Apple Account at confirmation of purchase. · It renews automatically unless cancelled at least 24 hours before the end of the current period. · Manage or cancel it in your device's App Store account settings. · Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ · Privacy Policy: https://sublater.netlify.app/privacy.html
Screenshots
Verdict
The clearest difference is ads: SubLater at none against VHDL Compiler's shown. SubLater also leads on update cadence (every 5 days vs every 2 months). VHDL Compiler's advantage is iOS requirement (12.0 vs 18.0). On price, 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
Both are free to download. VHDL Compiler sells 1 one-off in-app purchase and SubLater sells 2 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.
VHDL Compiler ships an update every 2 months, SubLater every 5 days. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.
| Parameter | VHDL Compiler | SubLater |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (7 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 7 — better | — |
| Update frequency | Every 2 months | Every 5 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 12.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 20 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Ketan Appa | Hyun jun Yang |
In-app purchases
VHDL Compiler
- Upgrade$2.99
SubLater
- SubLater Pro Monthly$8.991 Month
- SubLater Pro Yearly$49.991 Year









