HydroCloud vs Castly
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
HydroCloud
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HydroCloud is an efficient community management tool built exclusively for water vending machine operators, designed to enhance management efficiency and business operations.
Castly
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Give every character a voice. Turn your own EPUB, PDF, and TXT ebooks into audiobooks with Castly. AI identifies characters in your story and assigns different voices to narration and dialogue, making it easier to follow who is speaking. YOUR BOOKS, READY TO LISTEN Import a novel or ebook, check its chapters, and start listening. Keep your books together in your library and make time for a story on your commute, on a walk, or before bed. CHOOSE A VOICE FOR EACH CHARACTER Give the narrator and characters their own voices. Preview and choose voices to match the people you imagine, then adjust the assignments to suit your story. READ ALONG AND PICK UP WHERE YOU LEFT OFF Follow the text while the audio plays, set a comfortable playback speed, and continue from your last listening position when you return. BACKGROUND PLAYBACK AND SLEEP TIMER Keep listening while using other apps. Set a sleep timer or stop playback after a selected chapter. TRY A STORY BEFORE IMPORTING YOUR OWN Sign in to try a built-in, three-chapter sample story and experience multi-character narration before adding your own ebooks. CASTLY PRO Some character voice features require Castly Pro. Check the available plans, prices, and included features in the app before subscribing. Supports EPUB, PDF, and TXT files. PDFs must contain extractable text. Privacy Policy: https://fit.slothease.com/en/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: HydroCloud at none against Castly's 2. HydroCloud also leads on iOS requirement (15.0 vs 18.0). Castly's advantage is update cadence (weekly vs monthly). On price, ads and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Castly sells 2 in-app purchases, starting at $9.99 per month. HydroCloud asks for nothing beyond the download.
HydroCloud ships an update monthly, Castly weekly. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.
| Parameter | HydroCloud | Castly |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | Weekly β better |
| Ads | No | No |
| In-app purchases | No β better | Yes |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 15.0 β better | 18.0 |
| Further details β not scored | ||
| Size | 44 MB | 29 MB |
| Age rating | 4+ | 12+ |
| Developer | Beijing Heipitai Technology Co., Ltd | SlothEase |
In-app purchases
HydroCloud
No in-app purchases
Castly
- Castly Pro Monthly$9.991 Month
- Castly Pro Annual$49.991 Year









